JIAXING NANYANG WANSHIXING CHEMICAL CO.,LTD.

Summary Of Curing Mechanism Of Anhydride Epoxy Curing Agent(2021年11月19日)

wsxchem — 2021-11-19T11:21:54+0900

https://www.wsxchem.com/summary-of-curing-mechanism-of-anhydride-epoxy-curing-agent.html

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. was founded in 2004, as one subsidiary of Zhejiang Nanyang Group. It is the second chemical factory after Jiaxing Nanyang Plastic Chemical Co. Ltd.. We are professional epoxy hardener manufacturer.

The epoxy curing reaction mechanism of acid anhydrides is divided into two forms according to the presence or absence of an epoxy curing accelerator.

1. In the absence of accelerant, the hydroxyl group in the epoxy resin reacts with the acid anhydride, the acid anhydride is opened, and then the addition polymerization reaction is performed, the sequence is as follows:

I Hydroxyl reacts with anhydride to form ester bonds and carboxylic acids;

II Addition of carboxylic acid to epoxy group to form hydroxyl group;

III The resulting hydroxyl groups continue to react with other anhydride groups.

In addition, in such a system, since it is in an acidic state, another epoxy group and a hydroxyl group react in parallel with the above reaction to form an ether bond. It can be seen from the above mechanism that the cured product contains two structures of ether bond and ester bond, and the reaction rate is dominated by the epoxy group concentration and the hydroxyl group concentration.
2. In the presence of accelerants, Lewis base was used to promote the curing reaction of anhydrides. The reaction of the promoter (usually a tertiary amine) to the attack of the anhydride began. The main reactions are:

I Accelerators attack acid anhydride to form carboxylate anions;

II A carboxylate anion reacts with an epoxy group to form an oxygen anion;

III Oxygen anions react with other anhydrides to form carboxylate anions again.

In this way, the acid anhydride and the epoxy group interact with each other, and the addition polymerization proceeds gradually. In the presence of the accelerator Lewis base, all the bonds formed were ester bonds, and no ether bonds were found as if no accelerator was present.

In the presence of the accelerator, the curing speed of the epoxy resin is also dominated by the hydroxyl concentration in the system. Therefore, the addition of accelerators is very effective for liquid epoxy resins, and the curing reaction can be completed at 120 ~ 150℃. However, for solid epoxy resin, full attention must be paid to its very short pot life. In the absence of an accelerator, in theory, one epoxy group should be used for one anhydride, but in fact only 80% to 90% of the theoretical amount of chemical is sufficient. In the presence of an accelerator, the amount of acid anhydride is the theoretical amount.

What Is The Ratio Of Epoxy and Hardener(2021年11月19日)

wsxchem — 2021-11-19T11:21:14+0900

https://www.wsxchem.com/resources/what-is-the-ratio-of-epoxy-and-hardener.html

1. Amine curing agents

W(mass fraction of amine curing agent required for 100 mass fraction resin)/%=(amine equivalent/epoxy equivalent)*100 mass fraction resin=(molecular weight of amine*100 mass fraction resin)/ (number of active hydrogen atoms in amine molecule*epoxy equivalent=(molecular weight of amine/number of active hydrogen atoms in amine molecule)*epoxy value=(molecular weight of amine/number of active hydrogen atoms in amine molecule)*(percentage of epoxy matrix/epoxy group molecular mass)

2. Calculating the dosage of low relative molecular weight Polyamide

Amine value is often used to measure the number of amino groups in the specification of polyamide products in low relative molecule, which can not correctly reflect the number of active hydrogen atoms. Therefore, the amine value can not be simply used as the basis for calculating the amount of polyamide. For typical polyamides, the following formula can be used to calculate the dosage.

W(polyamide)%=(56100/amine value*f)*epoxy value n-3

3. Calculating the dosage of ketoimide

W(ketoimide)%=(curing agent equivalent/epoxy equivalent)*100

"Equivalent" here means that ketimine reacts with water at the same time.

We offer epoxy resin hardener ratio, epoxy hardener calculation, etc. If you are interested in them, please contact us.

What is Methyl Tetrahydrophthalic Anhydride(2021年11月19日)

wsxchem — 2021-11-19T11:20:37+0900

https://www.wsxchem.com/resources/what-is-methyl-tetrahydrophthalic-anhydride.html

Methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA) is used in a wide range of applications. What are the characteristics of methyl tetrahydrophthalic anhydride? What is the scope of the specific use?

Methyl anhydride (MTHPA, MeTHPA) can be prepared by reacting isoprene and piperylene, the main components of C5, which is a rich and inexpensive ethylene by-product. Therefore, it strengthens the deep processing of C5. Research, using it to produce MTHPA (MeTHPA), has certain practical significance.

Methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA) is an important intermediate in electronic information materials, pharmaceuticals, pesticides, resins, and the defense industry. It has the characteristics of low melting point, low toxicity, low volatility, etc. It is easy to use, has high reactivity with epoxy resin, and has good miscibility. The epoxy resin cured product using the curing agent has excellent electrical insulation performance and mechanical properties. In recent years, with the continuous improvement of the reliability requirements of insulation performance in the motor, electronics and electrical industries, the application of such curing agents has developed rapidly and has a good market prospect. The annual output of the world is 30,000 tons, the output value exceeds 300 million yuan, and the annual growth rate is 16% to 20%. They are mainly used in high-grade electronic packaging materials for epoxy resins, and can also be used in coatings, plasticizers, pesticides and other industries.

Isomerization reaction 1 to 5 at 130 ° C to 160 ° C in the presence of an acidic isomerization catalyst using solid methyltetrahydrophthalic anhydride (MTHPA, MeTHPA) or crude methyltetrahydrophthalic anhydride (MTHPA, MeTHPA) formed by the reaction of mixed carbon five with maleic anhydride. In an hour, a weakly basic compound equivalent to an acidic catalyst was further added, and the reaction was continued for 15 to 30 minutes, followed by distillation under reduced pressure to obtain a liquid MTHPA. The key to the technology is to add an appropriate amount of weakly basic compound to the system after the isomerization reaction and before the distillation under reduced pressure to react with the catalyst to form an inert substance, thereby preventing the isomerization reaction and the side reaction from continuing. The quality is improved and the yield is increased.

Epoxy Resin Hardener Classification(2021年11月19日)

wsxchem — 2021-11-19T11:19:47+0900

https://www.wsxchem.com/resources/what-is-epoxy-resin-hardener.html

The curing agent of epoxy resin has the chemical reaction with epoxy amine curing mechanism to form a reticulated stereopolymer, which envelops the composite material in the reticulate. A solid additive makes linear resins tough, including many types. Epoxy floor is mostly used for underground garage floor, which is cheap and practical.

Classification

Alkaline classification:
Alkaline curing agent WTF: including aliphatic diamines and polyamines, aromatic polyamines, other nitrogen-containing compounds and modified aliphatic amines.

Acidity classification:
Acidic curing agents include organic acids, anhydrides, boron trifluoride and their complexes.

Addition molding type:
Additive type curing agent: This kind of curing agent reacts with epoxy group to form part of the chain of curing product, and crosslinks linear molecules into structural molecules through step-by-step polymerization. This kind of curing agent is also called melon curing agent.

Catalytic type:
Catalytic curing agent: This kind of curing agent only has the reaction with the epoxy resin. After opening the epoxy group, it catalyzes the epoxy resin itself to polymerize into a network structure, forming a homopolymer with ether bond as the main structure.

Apparent type:
The apparent curing agent is a common curing agent, which can be divided into additive polymerization type and catalytic type. The so-called additive polymerization is additive polymerization by opening the ring of the epoxy ring, and the curing agent itself participates in the three-dimensional network structure. For this kind of curing, if the amount of curing agent is too small, the curing product will connect to the epoxy group of the final reaction. Therefore, there is a suitable dosage for this kind of curing agent. Catalytic curing agent is existing as the cationic or anionic state to make epoxy ring-opening addition polymerization. Ultimately, curing agent does not participate in the network structure, so there is no suitable amount of equivalent reaction; however, increasing the amount of curing agent will accelerate the curing rate. Among the apparent curing agents, dicyandiamide and dihydrazide adipate are insoluble in epoxy resin at room temperature and begin to cure after dissolving at high temperature, thus showing a latent state. Therefore, it can be called functional latent curing agent.

Latent type:
Latent curing agent refers to the curing agent that has relatively long-term stability of epoxy resin at room temperature after mixing with epoxy resin (epoxy resin generally requires more than three months to have greater practical value, and the ideal one requires more than six months or one year). It only needs to be exposed to heat, light, humidity and other conditions to start curing reaction. This kind of curing agent basically uses physical and chemical methods to seal the activity of curing agent. Therefore, in some books, these varieties are also classified as latent curing agents, which can actually be called functional latent curing agents. Because latent curing agent can be mixed with epoxy resin to form a liquid-type complex, which simplifies the process of epoxy resin application. Its application range is from single packaging adhesive to coating, impregnating paint, filling material, powder coating and so on. Latent curing agents have attracted more and more attention in foreign countries, which can be said to be a key subject of research and development. Various new curing agents and new technologies emerge endlessly , which are very active.

Amine curing agent:
The curing effect of primary amine and secondary amine on epoxy resin is that active hydrogen on nitrogen atom opens epoxy group, making it cross-linked and cured. Aliphatic polyamines such as ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and diethylaminopropylamine have higher activity, which can cross-link epoxy resin at room temperature, while aromatic polyamines have lower activity, such as m-phenylenediamine, which can only be cured completely at 150 ℃.

Anhydride curing agent:
Dibasic acids and their anhydrides, such as maleic anhydride and phthalic anhydride, can cure epoxy resin, but they must be baked at a higher temperature to complete curing. Anhydride first reacts with hydroxyl groups in epoxy resin to form monoesters. Carboxyl groups in monoesters are added to epoxy groups to form diesters.

Synthetic resin curing agent
Low molecular weight polyamide resin is a kind of amber viscous resin produced by the reaction of linoleic acid dimer or tung oleic acid dimer with aliphatic polyamines such as ethylenediamine and diethylenetriamine.

Latent curing agent:
This kind of curing agent is stable under general conditions, but when heated to a certain temperature, it shows its activity and cures epoxy resin. For example, dicyandiamide, mixed with epoxy resin, is stable at room temperature. The epoxy resin can be cured in 30 minutes at 145 - 165 C. Boron trinitride ethylamine complex is also stable at room temperature, and can cure epoxy resin at 100 C or above.

What Is Epoxy Hardener Made Of(2021年11月19日)

wsxchem — 2021-11-19T11:18:57+0900

https://www.wsxchem.com/resources/what-is-epoxy-hardener-made-of.html

The epoxy resin itself is a thermoplastic linear structure. After heating, the solid resin can be softened and melted into a viscous or liquid state. The thermal viscosity of liquid resin decreases. Only when curing agent is added, epoxy and hardener reaction can be used practically.

Epoxy resin hardener composition

A. Resin Composition
(1) Epoxy resin: Main component of resin composition, Bisphenol A epoxy resin and other epoxy hardener types of epoxy resin
(2) Curing agent: reacting with epoxy resin to form three-dimensional network polymer compounds

B. Modified components
(1) Plasticizers: Plasticizers give flexibility, but reduce heat resistance and drug resistance.
(2) Toughening agent: improve impact resistance, and make other properties reduced little, such as liquid acid carboxylated rubber
(3) Filler: increase weight, improve solidification, mechanical, thermal and electrical properties, such as calcium carbonate, mica, etc.

C. Regulating fluidity components (1) Dilutants: reducing the viscosity of components, which are divided into active diluents and inactive diluents. Thixotropic agent: give thixotropy to components, such as asbestos, silicon powder, etc.

D. Other ingredients: pigments, solvents, defoamers, levelers, tackifiers, etc.

After learning what is epoxy hardener made of and what is epoxy resin hardener, you may want to know what is epoxy hardener used for. Epoxy resins can be widely used because of the combination of these components. Especially curing agent, once the epoxy paint hardener is determined, curing agent plays a decisive role in the technological properties of epoxy resin components and the final properties of curing agent products (products). Epoxy resin itself is a linear structure of thermoplasticity. It can not be used directly. A second component must be added to the resin. Under certain temperature (or humidity) and other conditions, epoxy group of epoxy resin is used for addition polymerization or catalytic polymerization to produce cured materials with three-dimensional network structure (bulk network structure). This compound or resin, which acts as the second component, is called curing agent and is divided into additive curing agent and catalytic curing agent.

Curing agent:

A. Normal temperature curing

Heavy-duty anticorrosive coatings; Civil building adhesives; Civil building coatings; FRP; General binders.
Straight chain aliphatic polyamines, polyamides, alicyclic polyamines, denatured polyamines, polymercaptan

B. Heating curing

(1) Electrical insulating materials: acid anhydride, imidazole compounds, BF3 complex.
(2) Laminating materials: Dicy, aromatic polyamines, linear phenolic resin.
(3) Coatings (Tank: Amino Resin, Phenolic Resin, Powder: Dicy, Aromatic Polyamines, Anhydride).
(4) Molding material: linear phenolic resin.
(5) Binders: Aromatic polyamines, anhydrides, imidazoles, BF3-complexes.

What Is The Ratio Of Epoxy and Hardener?(2021年10月20日)

wsxchem — 2021-10-20T10:22:32+0900

https://www.wsxchem.com/resources/what-is-the-ratio-of-epoxy-and-hardener.html

1. Amine curing agents

2. Calculating the dosage of low relative molecular weight Polyamide

Amine value is often used to measure the number of amino groups in the specification of polyamide products in low relative molecule, which can not correctly reflect the number of active hydrogen atoms. Therefore, the amine value can not be simply used as the basis for epoxy hardener calculation. For typical polyamides, the following formula can be used to calculate the dosage.

W(polyamide)%=(56100/amine value*f)*epoxy value n-3

3. Calculating the dosage of ketoimide

W(ketoimide)%=(curing agent equivalent/epoxy equivalent)*100

"Equivalent" here means that ketimine reacts with water at the same time.

If you want to get more details of epoxy hardener ratio, visit our website, where you can ind the answer.
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What Is Epoxy Hardener Made Of(2021年10月20日)

wsxchem — 2021-10-20T10:21:59+0900

https://www.wsxchem.com/resources/what-is-epoxy-hardener-made-of.html

What is epoxy hardener made of
The epoxy resin itself is a thermoplastic linear structure. After heating, the solid resin can be softened and melted into a viscous or liquid state. The thermal viscosity of liquid resin decreases. Only when curing agent is added, epoxy resin can be used practically.

Epoxy resin hardener composition
A. Resin Composition
(1) Epoxy resin: Main component of resin composition, Bisphenol A epoxy resin and other epoxy hardener types
(2) Curing agent: reacting with epoxy resin to form three-dimensional network polymer compounds

D. Other ingredients: pigments, solvents, defoamers, levelers, tackifiers, etc.

After learning what is epoxy resin hardener, you may want to know what they are used for. Epoxy resins can be widely used because of the combination of these components. Especially curing agent, once the epoxy resin is determined, curing agent plays a decisive role in the technological properties of epoxy resin components and the final properties of curing agent products (products). Epoxy resin itself is a linear structure of thermoplasticity. It can not be used directly. A second component must be added to the resin. Under certain temperature (or humidity) and other conditions, epoxy group of epoxy resin is used for addition polymerization or catalytic polymerization to produce cured materials with three-dimensional network structure (bulk network structure). This compound or resin, which acts as the second component, is called curing agent and is divided into additive curing agent and catalytic curing agent.

Curing agent:

A. Normal temperature curing

B. Heating curing

You may have other question,such as what is epoxy hardener used for, and if you want to get answer, please visit our website.

As one of the professional epoxy resin and hardener manufacturers, we have the confidence to meet all customers’ needs.

Is Epoxy Resin Heat Resistant?(2021年10月20日)

wsxchem — 2021-10-20T10:21:26+0900

https://www.wsxchem.com/resources/is-epoxy-resin-heat-resistant.html

1. Epoxy resin AB adhesive classification: can be divided into epoxy resin filling adhesive, epoxy resin thermal conductive adhesive, epoxy resin sealant, epoxy resin high temperature adhesive, epoxy resin fast-drying adhesive.

2. Epoxy resin AB adhesive is a fast curing series, clear and viscous epoxy resin adhesive. It can be cured at low or normal temperature with fast curing speed. After curing, the bonding strength is high, the hardness is good and the resistance is good. After curing, it has good acid and alkali resistance, moisture-proof, waterproof, oil-proof and dust-proof functions, moisture-heat resistance and atmospheric aging resistance. After curing, it has excellent electrical and physical properties of insulation, compression, bonding strength. So how high temperature can the epoxy resin AB resist? For different product processes, the temperature resistance is also different, 100 degrees, 200 degrees, 300 degrees, 1000 degrees and so on.

If you want to know that is epoxy glue heat resistant? You can check it on our website.

There are many epoxy resin and hardener manufacturers in China, but we are the best choice for you.

Cured Epoxy Melting Point(2021年10月20日)

wsxchem — 2021-10-20T10:20:55+0900

https://www.wsxchem.com/resources/cured-epoxy-melting-point.html

Epoxy resin is not pure, such as bisphenol A epoxy resin is composed of homologous compounds with different degree of polymerization, so it has no clear cured epoxy melting point, only a melting temperature range, called softening point, to characterize its melting temperature. The softening point is a temperature range. For example, the softening point can range from 58 degrees to 93 degrees due to different composition and content. Epoxy phenolic semi-solid with high viscosity, average functionality 2.5-6.0, softening point less than 28 degrees; Triphenol-based methane triglycidyl ether epoxy resin is a red solid with softening point 72-78 ℃. Some crystalline epoxy resins, with high purity, can also be called melting point, such as 140 ℃.
As an epoxy hardener manufacturer, we have strict production process, advanced equipments, strong technical force to ensure the stability of product quality and superior performance, have passed the ISO9001 quality management system certification and 14001 environmental system certification. We are a member of China Epoxy Resin Technology Applied Association. With stable quality and outstanding performance, our products have been used in electronics, electric area, insulants and embedding materials, and are in great demand among customers nationwide.

Basic Information and Properties of MTHPA(2021年10月20日)

wsxchem — 2021-10-20T10:19:23+0900

https://www.wsxchem.com/resources/basic-information-and-properties-of-mthpa.html

Mthpa anhydride is a chemical with a molecular formula of C9H10O3.

First, basic information.
Name: Methyl Tetrahydrophthalic Anhydride
Alias: 1,2,3,6-TETRAHYDRO-3-METHYLPHTHALIC ANHYDRIDE;
1-METHYL-5-CYCLOHEXENE-2, 3-DICARBOXYLIC ANHYDRIDE;
3-METHYL-DELTA4-TETRAHYDROPHTHALIC ANHYDRIDE;
3-METHYLTETRAHYDROPHTHALIC ANHYDRIDE;
4-METHYL-1,2,3,6-TETRAHYDROPHTHALIC ANHYDRID;
4-METHYL-4-CYCLOHEXENE-1, 2-DICARBOXYLIC ANHYDRIDE;
4-METHYL-DELTA4-TETRAHYDROPHTHALIC ANHYDRIDE;
4-METHYL TETRAHYDROPHTHALIC ANHYDRIDE;
4-MTHPA;
Numbering: B1030
cas 26590 20 5

Second, basic performance.
Methyl tetrahydrophthalic anhydride, one of the mthpa anhydride referred to as MTHPA, MeTHPA, has two isomers, namely 4-methyltetrahydrophthalic anhydride and 3-methyltetrahydrophthalic anhydride, having a melting point of 65 °C and 63 °C. It is rarely used as a curing agent alone. The actual commodity is a liquid mixture that isomerized to various isomers. The molecular weight is 166.17, and light yellow color, transparent oily liquid, relative density of 1.20 - 1.22. Freezing point < -20 °C. The boiling point is 115-155 °C. Viscosity (25 °C) 40 - 80 mPa · s. The refractive index is 1.4960 to 1. 4980. The anhydride group content is ≥ 40%. The neutralization equivalent is 81-85. The flash point is 137 - 150 °C. Soluble in acetone, ethanol, toluene, etc. It has good stability in air and is not easy to precipitate crystals. Low toxicity, LD502102mg/kg.
As one of the epoxy resin and hardener manufacturers, we will provide high quality products to our customers.

Acid Anhydride Curing Agent Guide(2021年10月20日)

wsxchem — 2021-10-20T10:15:26+0900

https://www.wsxchem.com/resources/acid-anhydride-curing-agent-guide.html

The curing reaction mechanism of anhydrides can be divided into two forms according to the presence or absence of accelerators.

1. In the absence of accelerants, the hydroxyl group in epoxy resin reacts with anhydride first, and the anhydride is turned on, then the addition polymerization is carried out. The order is as follows:

Hydroxyl reacts with anhydride to form ester bond and carboxylic acid.
Carboxylic acid is added to epoxy group to form hydroxyl group.
The hydroxyl groups formed continue to react with other anhydrides.

The reaction proceeds repeatedly to form bulk polymers. In addition, in this system, due to the acidic state, the reaction parallel to the above reaction is the reaction of other epoxy groups with hydroxyl groups, resulting in the formation of ether bonds. From the above mechanism, it can be seen that there are two kinds of structures in the cured product: ether bond and ester bond, and the reaction rate is controlled by the concentration of epoxy group and hydroxyl group.

2. In the presence of accelerants, the acid anhydride curing reaction is promoted by Lewis base. Accelerators (usually tertiary amines) initiate an attack on anhydride. The main reactions are as follows:

accelerator attacked anhydride to form carboxylate anion.
carboxylate anion reacts with epoxy group to form oxygen anion.
oxygen anion reacts with other anhydrides to form carboxylate anion again.

In this way, acid anhydride reacts with epoxy group, and additive polymerization is carried out step by step. In the presence of promoter Lewis base, all the bonds formed are ester bonds, and no ether bond was found as in the absence of promoter.

In the presence of accelerants, the curing rate of epoxy resin is also controlled by the concentration of hydroxyl groups in the acceptor system. Therefore, the addition of accelerators is very effective for liquid epoxy resin, and the curing reaction can be completed at the temperature of the 120～150℃. But for solid epoxy resin, we should pay attention to the problem of very short application period. In the absence of accelerants, theoretically, an epoxy group should be used for an anhydride, but in fact, only 80%-90% of the theoretical chemical quantity is enough. In the presence of accelerants, the amount of anhydride used is the chemical theoretical quantity.

What is Curing Agent(2021年08月26日)

wsxchem — 2021-08-26T11:21:21+0900

https://www.wsxchem.com/resources/what-is-curing-agent.html

What is Curing Agent

Curing agent, also known as hardener, curing agent or fixing agent, is a kind of substance or mixture that promotes or controls curing reaction. Resin curing is a process of irreversible change of thermosetting resin through condensation, closed-loop, addition or catalysis. Curing is accomplished by adding curing agent. Curing agent is an indispensable additive, whether as the binders, coatings and castables, otherwise epoxy resin can not be cured. Varieties of curing agents have great influence on the mechanical properties, heat resistance, water resistance and corrosion resistance of the cured products.

Curing agents are classified according to chemical composition

1. Aliphatic amines such as vinyltriamine DETA, aminoethyl piperazine AE
2. Aromatic amines such as m-PDA MPD diaminodiphenylmethane DDM HT-972 DEH-50
3. Amide Amines
4. Latent curable amines
5. Urea substitutes.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. Is a professional epoxy resin and hardener manufacturers, we provide isophorone diamine epoxy curing agent, heat resistant epoxy glue and etc. Want to know more? Please contact us.

Is Epoxy Resin Heat Resistant?(2021年08月26日)

wsxchem — 2021-08-26T11:20:59+0900

https://www.wsxchem.com/resources/is-epoxy-resin-heat-resistant.html

Is Epoxy Glue Heat Resistant?

2.Epoxy resin AB adhesive is a fast curing series, clear and viscous epoxy resin adhesive. It can be cured at low or normal temperature with fast curing speed. After curing, the bonding strength is high, the hardness is good and the resistance is good. After curing, it has good acid and alkali resistance, moisture-proof, waterproof, oil-proof and dust-proof functions, moisture-heat resistance and atmospheric aging resistance. After curing, it has excellent electrical and physical properties of insulation, compression, bonding strength. So how high temperature can the epoxy resin AB resist? For different product processes, the temperature resistance is also different, 100 degrees, 200 degrees, 300 degrees, 1000 degrees and so on.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. Is a professional epoxy resin and hardener suppliers, we provide high temperature epoxy resin adhesive, epoxy glue temperature tolerance, heat resistant epoxy glue and etc. Want to know more? Please contact us.

How Long does it Take for Epoxy Resin to Harden?(2021年08月26日)

wsxchem — 2021-08-26T11:20:32+0900

https://www.wsxchem.com/resources/how-long-does-it-take-for-epoxy-resin-to-harden.html

Three stages of epoxy resin curing agent

1. Liquids - Operating time

Operating time (also working time or service life) is a part of curing time. After mixing, the resin/curing agent mixture is still liquid and can work and be suitable for application. In order to ensure reliable bonding, all construction and positioning work should be done well in curing operation time.

2. Gel - entry curing

The mixture begins to enter the curing phase (also known as ripening stage), when it begins to gel or "mutate". At this time, epoxy is not likely to work for a long time, and will also lose its stickiness. At this stage, it can not be interfered with. It will turn into a hard rubber soft gel, and you will be able to press it with your thumb. Because the mixture is only partially cured at this time, the newly used epoxy resin can still be chemically linked to it, so the untreated surface can still be bonded or reacted. In any case, these abilities of near-cured mixtures are decreasing.

3. Solid-Final curing

When the epoxy mixture reaches the solidification stage, it can be sanded and shaped. By this time you can't press it with your thumb. At this time, the epoxy resin has about 90% final reaction strength. Therefore, the fixing clamp can be removed and kept at room temperature for several days and it continues to solidify.

Curing time of epoxy resin is related to curing temperature. Generally speaking, under the same curing agent, the higher the temperature, the shorter the curing time. In order to meet different industrial applications, epoxy resins produced in the market now have curing time of several minutes and one or two hours (under normal or heating conditions). Others can be completely cured at room temperature for more than ten or dozens of hours, and some single-component UV-curable glue, the main component of which is epoxy resin. The curing time is only tens of seconds to two to three minutes by UV irradiation.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. Is a professional epoxy resin hardener suppliers, we provide isophorone diamine epoxy curing agent, heat resistant epoxy glue and etc. Want to know how long does epoxy glue take to dry or epoxy resin cure time? Please contact us.

How to Choose a Curing Agent(2021年08月26日)

wsxchem — 2021-08-26T11:20:08+0900

https://www.wsxchem.com/how-to-choose-a-curing-agent.html

(1)CONSIDER THE VARIETIES AND PERFORMANCE OF THE CURING AGENT

The varieties of curing agent have a great influence on the mechanical properties, heat resistance, water resistance, corrosion resistance of the curing agent, such as aromatic polyamines, imidazole, acid anhydride curing agents for epoxy resins. The heat resistance of cured epoxy resins is better than that of aliphatic polyamines and low molecular polyamide curing agents; Aromatic anhydride cured epoxy resins have better water resistance than curing agents of aromatic diamines and aliphatic polyamines; Triethylenetetetramine curing agent has good alkali-resistance, but it is less resistant to acid and formaldehyde solutions. The alicyclic polyamines (such as isophorone diamine) cure epoxy resins have excellent drug resistance. The alkali resistance of acid anhydride curing agent cured epoxy resins is better than its acid resistance. Therefore, the appropriate curing agent should be selected according to different purposes and performance requirements.

(2) COMPOUND USE OF SEVERAL CURING AGENTS

Through the compound use of several curing agents, it can achieve complementary results. For example, the use of a low molecular polyamide curing agent with a small amount of resorcinamide curing agent can not only be cured at room temperature but also increase the durability as well as the heat resistance appropriately of the cured substance. The combination of trimellitic anhydride (TMA) and methyl-tetrahydro phthalic anhydride produces a low viscosity eutectic mixture (25°C, 200-250 mPa-s), which is easy to mix with epoxy resin and improves the processability.

(3) PAY ATTENTION TO THE ENVIRONMENTAL PROTECTION OF CURING AGENTS

The selected curing agents should be non-hazardous to humans and non-polluting to environment. Ethylenediamine should never be used for curing alone.

Formulation of Epoxy Resin Hardener(2021年08月26日)

wsxchem — 2021-08-26T11:19:34+0900

https://www.wsxchem.com/formulation-of-epoxy-resin-hardener.html

Epoxy resin hardener reacts with epoxy resin to form a network solid polymer. The composite is wrapped in the network, which can transform the linear resin into a tough bulk solid.

1. TYPES OF CURING AGENTS BASIC
Basic curing agent WTF: including aliphatic diamines and polyamines, aromatic polyamines, other nitrogen compounds and modified fatty amines.

Acidic type

Acid curing agents: organic acids, anhydrides, boron trifluoride and their complexes.

Addition molding

Addition of curing agent: the curing agent reacts with epoxy group to form a part of the curing product chain segment, and the linear molecule is crosslinked with the structure molecule of the cost body through gradual polymerization. This curing agent is also called melon curing agent.

Catalytic type

Catalytic curing agent: this curing agent only causes epoxy resin. After opening the epoxy group, the epoxy resin itself polymerizes into a network structure to form a homopolymer with ether bond as the main structure.

Manifest type

Apparent curing agent is a common curing agent, which can be further divided into addition polymerization type and catalytic type. The addition polymerization type is a ring that opens epoxy group for addition polymerization. The curing agent itself participates in the three-dimensional network structure. If too little is added, the curing agent will adhere to the final reactive epoxy group. Therefore, for this curing agent, there is an appropriate amount. The catalytic curing agent circularly adds and polymerizes epoxy groups in the form of cation or anion. Finally, the curing agent does not participate in the network structure, so there is no appropriate equivalent reaction amount. However, the dose is increased. Speed up curing. In the obvious curing agent, dicyandiamide and adipic acid diacylhydrazide are insoluble in epoxy resin at room temperature, and begin to cure after dissolving at high temperature, so they show latent state. Therefore, it can be called a functional latent curing agent.

Latent type

Latent curing agent refers to the relatively long-term stability at room temperature after mixing with epoxy resin (epoxy resin usually takes more than 3 months, which has great practical value. It is preferred to take half a year or more) , just expose to heat, light, moisture and other environment, and the curing reaction begins. This curing agent can prevent the activity of curing agent in physical and chemical aspects. Therefore, in some books, these varieties are also classified as latent curing agents. It can be called a functional latent curing agent. Because latent curing agent can be mixed with epoxy resin to make liquid composite, the matching procedure of epoxy resin application is simplified. Its application range is from single package adhesive to coating, impregnation varnish, potting material, powder coating, etc. More and more attention has been paid to the development of potential curing agents abroad. It can be said that it is a key topic of research and development. A variety of new curing agents and new technologies are emerging. Relevant R & D activities are very active.

Amine curing agent

The curing action of primary amine and secondary amine on the epoxy resin is to open the epoxy group through the active hydrogen on the nitrogen atom to crosslink and cure. Aliphatic polyamines, such as ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and diethylaminopropylamine, have high activity and can crosslink and solidify epoxy resin at room temperature. The reaction at low temperature, such as m-phenylenediamine, can be cured at 150 ℃

2. FORMULATION OF EPOXY RESIN HARDENER
Anhydrides curing agent

Binary acids and their anhydrides, such as maleic anhydride and phthalic anhydride, can cure epoxy resins. However, it must be baked at a higher temperature to fully cure. Anhydrides react with hydroxyl groups in epoxy resin to form monoesters, and the carboxyl groups in the monoesters are esterified by the epoxy group to form diesters.

Synthetic resin curing agent

Low molecular weight polyamide resin is an amber viscous resin formed by the reaction of linoleic acid dimer or tung oil dimer with aliphatic polyamines such as ethylenediamine or diethylenetriamine. The structure of the resin prepared from dimeric linoleic acid and ethylenediamine is as follows:

Latent curing agent

The curing agent is stable under ordinary conditions, but when heated to a certain temperature, its activity shows that the epoxy resin can be cured. If dicyandiamide is mixed with epoxy resin, it is stable at room temperature. If the temperature is 145-165 ℃, the epoxy resin can be cured within 30 minutes. Boron trichloride ethylamine complex is stable at room temperature. Cure the epoxy at a temperature higher than 100 ℃.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. Is a professional epoxy hardener manufacturer, we provide isophorone diamine epoxy curing agent, heat resistant epoxy glue and etc. Want to know epoxy coating formulation or more? Please contact us.

Introduction to Preparation of Methyl Tetrahydrophenylanhydride(2021年06月09日)

wsxchem — 2021-05-28T10:36:47+0900

https://www.wsxchem.com/mthpa/

Methyltetrahydrophthalic anhydride plays a very important role in the medical, pesticide and other industries. I believe that many people don't know much about methyltetrahydrophthalic anhydride. Today, I will mainly introduce the knowledge of methyltetrahydrophthalic anhydride preparation.

To synthesize methyl tetrahydrophthalic anhydride with gaseous mixture of C5 and maleic anhydride in methyl tetrahydrophthalic anhydride solution:

1) Experimental method of batch reaction

Prepare a certain amount of 25% maleic anhydride in methyltetrahydrophthalic anhydride solution, add an appropriate amount of polymerization inhibitor, take 80mL of the prepared solution and add it to the maleic anhydride solution storage bottle, and take 41mL of mixed C5 liquid into the C5 storage bottle (The ratio of the active component in C5 to the amount of maleic anhydride is 1.1:1), keep the constant temperature water tank at 44℃ (the boiling point of C5 at normal temperature), and control the dropping rate of C5 by adjusting the knob. The rate of ld/3s, ld/4S and ld/5S is added dropwise. C5 is added dropwise to the gasification flask to quickly vaporize and flow into the reaction flask to react with maleic anhydride solution (the C5 gas velocity is measured by liquid volume). Investigate the effect of c5 feed rate and temperature on the reaction. Record the temperature in the reaction flask every 15 minutes after the start of the experiment, and take samples for analysis.

2) Continuous reaction experiment method

Prepare a certain amount of 25% maleic anhydride in methyltetrahydrophthalic anhydride solution, add an appropriate amount of polymerization inhibitor, add the prepared maleic anhydride solution to the storage bottle, and take a sufficient amount of mixed C5 liquid into the C5 storage bottle. The constant temperature water bath where the C5 vaporization bottle is located is kept at 44℃, and the dropping speed of C5 and maleic anhydride is controlled by adjusting the knob to investigate the influence of the feed ratio on the reaction. Change the temperature of No. 1 constant temperature water bath to investigate the influence of temperature. After the experiment starts, record the temperature in the reaction flask every 15 minutes and take samples for analysis.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

What Should Be Paid Attention to in Storage and Transportation of Methyltetrahydrophthalic Anhydride?(2021年06月08日)

wsxchem — 2021-05-28T10:36:09+0900

https://www.wsxchem.com/mthpa/

As a special medicine, methyltetrahydrophthalic anhydride needs to be paid attention to during transportation and storage in order to ensure its efficacy. Everyone knows which aspects should be paid attention to. It may be clear to those in the industry. Not comprehensive enough, let's talk about the storage and transportation of methyltetrahydrophthalic anhydride.

Methyltetrahydrophthalic anhydride should be stored in a cool, ventilated warehouse, away from fire and heat sources. The storage temperature should not exceed 37℃. The packaging must be sealed and not in contact with air. It should be stored separately from oxidizers, etc., and avoid mixed storage. Use explosion-proof lighting and ventilation facilities, and prohibit the use of mechanical equipment and tools that are prone to sparks. The storage area should be equipped with leakage emergency treatment equipment and suitable storage materials, and the storage period is 12 months.

Transportation vehicles should be equipped with corresponding fire-fighting equipment and leakage emergency treatment equipment. Mixed shipment and transportation with oxidants and edible chemicals are strictly prohibited. It is forbidden to use mechanical equipment and tools that easily generate sparks for loading and unloading. It is best to transport in the morning and evening in summer. Avoid exposure to the sun, rain, and high temperature during transportation, and stay away from fire, heat sources, and high temperature areas when you stop. During railway transportation, it is forbidden to drop off, and it is strictly forbidden to use wooden boats or cement boats to transport in bulk. Danger signs and announcements shall be posted on the transportation tools according to relevant transportation requirements.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

Disposal of Waste Liquid in the Production of Methyltetrahydrophthalic Anhydride(2021年06月07日)

wsxchem — 2021-05-28T10:35:28+0900

https://www.wsxchem.com/mthpa/

Methyltetrahydrophthalic anhydride has a wide range of applications in chemicals, medicine, etc., and its role is very important. Many people will be curious about how to treat the waste liquid during the production of methyltetrahydrophthalic anhydride. Let me tell you how to treat the waste liquid.

Methyltetrahydrophthalic anhydride waste liquid treatment is actually a treatment equipment for methyltetrahydrophthalic anhydride. Its structure includes a filter tank. The left side of the filter tank is equipped with a waste liquid inlet pipe, and the inside of the filter tank is equipped with baffles. There is an additive hopper on the upper side, a waste liquid discharge pipe on the right side, a PH adjustment room inside, a hydrolysis acidification room on the right side of the PH adjustment room, and a deodorization room on the right side of the hydrolysis acidification room. The right side is provided with a static chamber, the PH adjustment chamber, the hydrolysis acidification chamber and the deodorization chamber are respectively provided with a stirrer, and a stirring motor is provided above the stirrer. The waste liquid enters the treatment equipment, passes through a series of filtration and purification by internal machines, and finally reaches the discharge standard.

The equipment can effectively purify the waste liquid, reduce the environmental pollution when the waste liquid is discharged, reduce the pollution of the waste liquid to the water resources, and improve the protection of the water resources. The design of the decontamination pipe can be effective and convenient Eliminating the sediment in the filter tank improves the convenience of cleaning the filter tank.

When the methyltetrahydrophthalic anhydride waste liquid is treated, it needs to be applied to professional purification equipment, so that it can be processed better.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

Application of Methyl Tetrahydrophenylanhydride(2021年06月06日)

wsxchem — 2021-05-28T10:34:36+0900

https://www.wsxchem.com/mthpa/

Methyltetrahydrophthalic anhydride (MTHPA) is a light yellow transparent thick liquid. It is a key chemical intermediate for electronic information technology raw materials, pharmaceuticals, epoxy resins, and national defense technology. It can also be used in manufacturing industries such as architectural coatings and fertilizers.

Methyltetrahydrophthalic anhydride is mainly prepared by Diels-Alder reaction of mixed C5 and maleic anhydride. The main components of mixed C5 are piperylene and isoprene (about 50% by mass), pentene-1, pentene-2, n-pentane, and isopentane. The main reactions of mixing C5 and maleic anhydride are the reaction of piperylene and maleic anhydride and the reaction of isoprene and maleic anhydride.

Domestic production of methyltetrahydrophthalic anhydride adopts a batch production process, which has many shortcomings, such as time-consuming and labor-intensive operation, instability of the system, and slower reaction when the concentration of reactants in the later stage of the reaction decreases, thereby increasing the reaction time. Different batches of products have differences, for example, insufficient production capacity. In recent years, with the continuous improvement of insulation performance and reliability requirements in the electrical, electronic, and electrical industries, the application has developed rapidly, and the market demand is increasing. The inadequacy of intermittent production technology lies in this background is obvious.

Methyltetrahydrophthalic anhydride is an important intermediate in electronic information materials, medicines, pesticides, resins, and defense industries. It has the characteristics of low melting point, low toxicity, low volatility, etc., is convenient to use, has high reactivity with epoxy resin and good miscibility. The epoxy resin cured product using this curing agent has excellent electrical insulation and mechanical properties.

Using methyltetrahydrophthalic anhydride production waste liquid to prepare C5 petroleum resin, including (1) Separating and removing the colloidal cis-piperylene material A from methyltetrahydrophthalic anhydride production waste liquid, and separating the C5 fraction by cracking Removal of dicyclopentadiene to obtain decyclic C5 material B; (2) Feed materials A and B at a weight ratio of 1:0.1-5, catalyzed by aluminum trichloride catalyst, in a batch mode in C5 light oil solvent Cationic polymerization reaction; (3) After the polymerization reaction, the catalyst is removed by three-stage continuous water washing to obtain C5 petroleum resin. The C5 petroleum resin paint prepared by the invention has light color, high softening point, stable quality index, and is specially used for road marking. The method uses methyltetrahydrophthalic anhydride production waste liquid, improves the utilization value of waste liquid, and adopts continuous water washing The process is automated, which improves the washing efficiency and reduces the loss of water and materials.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

Market Analysis of the Methyl Tetrahydrophthalic Anhydride(2021年06月05日)

wsxchem — 2021-05-28T10:33:43+0900

https://www.wsxchem.com/mthpa/

The methyl tetrahydrophthalic anhydride is used as the curing agent of epoxy resin, the solvent-free paint, the laminated board, the adhesive, etc. It has excellent properties of long-term coexistence at room temperature, low freezing point, low toxicity, and so on, which is widely used in electronic and electrical industries.

For example: dry type transformer, insulator, insulating basin, insulating sleeve, insulating paint, high voltage switch, mutual inductor, line output transformer, electric power as well as household capacitor, oil pipeline, etc.

In addition to the above application fields, the methyl tetrahydrophthalic anhydride benefits are particularly suitable for outdoor application.

For example: outdoor transformer, luminous diode, etc.
At present, the manufacturers of methyl tetrahydrophthalic anhydride in China are mainly concentrated in Shanghai, Jiaxing, Wuxi, Nantong and other places, with an annual production capacity of about 50,000 tons actually.

In recent years, due to the rapid development of the automatic forming technology of epoxy insulating products, the new insulation materials that used methyl tetrahydrophthalic anhydride as raw materials have replaced traditional materials such as bakelite, SMC, porcelain and so on. There is a great trend of epoxy insulating materials dominating the world. Meanwhile, its market demand is also increasing.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

The Properties of Epoxy Adhesive(2021年06月04日)

wsxchem — 2021-05-28T10:33:09+0900

https://www.wsxchem.com/mthpa/mthpa-wny1001.html

The epoxy resin adhesive properties: the structure of general epoxy resin contains hydroxyl and ether linkage, which makes it high adhesion. Because of these polar groups, its adjacent interface will generate electromagnetic force. With the chemical action of the curing agent, the epoxy adhesive can further produce hydroxyl and ether linkage in the curing process, which not only has high cohesiveness, but also has strong adhesion. Therefore, the epoxy adhesive has strong bonding strength with many materials such as metal, plastic, glass, wood, fiber, etc., commonly known as "all-purpose adhesive".

The epoxy resin has tightly packed molecules, so no low molecular substances will be precipitated in the curing process. Besides, it can be prepared into a solvent-free adhesive, so its shrinkage rate is low in general. If proper fillers are selected, its shrinkage can be reduced to 0.1-0.2%.

There exist stable benzene ring and ether chain in the chemical structure of epoxy resin, as well as the compact structure after curing, which determines curing agent for epoxy resin's strong resistance to the atmosphere, humidity, chemical medium, bacteria, etc. Therefore, it can be applied in many extreme environments.

The epoxy adhesive has high adhesion strength, low shrinkage rate and stable size. Besides, the epoxy resin adhesive will not produce any low molecular substance in the curing process and its coefficient of linear expansion is less affected by temperature. Therefore, products bonded by the epoxy resin adhesive will be stable dimensionally. The cured products of epoxy resin adhesive have excellent electrical insulation properties, with the volume resistivity of 1013-1016 Ω· cm and the dielectric strength of 30-50 Ω· cm KV/Mm. As for the molecules, the epoxy resin contains ether bonds, the molecular chains are closely arranged, and its crosslinking density is high, so it has good solvent resistance, oil resistance, acid resistance, water resistance and other properties, especially strong alkali resistance. The epoxy resin is soluble in and even reacts chemically with many rubber (elastomer) and thermoplastic resins. It has a good dispersion with fillers and can change the properties of epoxy resin adhesive in a large range. Furthermore, it has good manufacturability, high usability, low toxicity and low harmfulness. However, various benzene rings and heterocyclic rings in the resin structure, poor molecular chain flexibility, and uneasy deformation of its cross-linked structure after curing, all of which lead to the poor tenacity, high fragility, low peel strength and vibration resistance of epoxy resin adhesive.

According to the above information, we can know that the epoxy resin has good comprehensive mechanical properties, especially high adhesion, low shrinkage, good stability and excellent electrical insulation, which provides a material basis for adhesive, composite matrix, coating powder and other products.
Related News

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

The Advantages of Epoxy Resin Adhesive(2021年06月03日)

wsxchem — 2021-05-28T10:32:29+0900

https://www.wsxchem.com/resources/is-epoxy-resin-heat-resistant.html

1. The epoxy resin adhesive contains various polar groups and highly active epoxy groups, so it has strong adhesion with metal, glass, cement, wood, plastic and other polar materials, especially those with high surface activity. At the same time, the cured epoxy resin also has strong cohesion strength, which leads to high bonding strength.

2. Basically, no low molecular volatiles are produced when the epoxy resin adhesive is cured. The shrinkage volume of adhesive layer is small, about 1% - 2%, which is one of the varieties that its curing shrinkage rate is the smallest among thermosetting resins. After adding fillers, the shrinkage volume can be reduced to less than 0.2%. Besides, the small linear expansion coefficient of the cured epoxy resin results in small internal stress and low influence on bonding strength. In addition, the small creepage of the cured epoxy resin contributes to the high stability of adhesive layer.

3. There are many kinds of epoxy resins (such as high temperature epoxy resin adhesive), curing agents and modifying agents. Through reasonable and ingenious formula designing, the adhesive can be equipped with required manufacturability (such as rapid curing, room temperature curing, low-temperature curing, water curing, low viscosity, high viscosity, etc.) and usability (such as high-temperature resistance, low-temperature resistance, high strength, high flexibility, aging resistance, electric conductivity, magnetic conductivity, heat conduction, etc.)

4. The epoxy resin adhesive has good compatibility and reactivity with a variety of organic compounds (monomers, resins, rubbers) and inorganic compounds (such as fillers), which is easy to copolymerize, crosslink, blend, fill and other modifications to improve the performance of the adhesive layer.

5. The epoxy resin adhesive has good corrosion resistance and dielectric properties. It can resist the corrosion of acid, alkali, salt, solvent and others. Its volume resistivity is 1013-1016 Ω· cm and its dielectric strength is 16-35kv/mm.

6. The general-type epoxy resins, curing agents and additives have many production places, high output and simple preparation. Besides, it can be molded by contact, which can be applied on a large scale.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

Application Range of Epoxy Resin Adhesive(2021年06月02日)

wsxchem — 2021-05-28T10:31:55+0900

https://www.wsxchem.com/resources/is-epoxy-resin-heat-resistant.html

1. The epoxy resin adhesive is suitable for the protection of the flow surface of hydraulic structure against abrasion, cavitation erosion, freezing and thawing, and for its repair after damage;

2. The epoxy resin adhesive is used for the defects repairing and reinforcement of the concrete buildings;

3. The high temperature epoxy resin adhesive can be applied to the defect treatments, such as cracks in beams, columns and pile caps of buildings, and cellular holes, loopholes and exposed reinforcing steel bars on the surface of concrete structures;

4. The epoxy resin adhesive is suitable for the wear resistance and repair of engineering parts in the runway, highway, bridge, tunnel, workshop mortar floor and so on;

5. The epoxy resin adhesive is suitable for the bottom leveling when bonding steel and concrete, or reinforcing bonding steel or carbon fiber;

6. The epoxy resin adhesive is used for the protection and repair of concrete or metal components of chemical engineering, petroleum, factory, wharf, etc. to resist acid, alkali and salt corrosion. In addition, it is the same with the chemical anti-corrosion industries, such as sewage treatment pools, acid and alkali resistant ground, FRP anti-corrosion and others;

7. The epoxy resin adhesive applies to the sealing anticorrosion and loopholes reinforcement of interfaces in the underground pipelines, hydropower stations, dam foundations, etc.;

8. The epoxy resin adhesive is appropriate for the paving and caulking of granite, marble, acid-resistant ceramic tile (board), as well as the FRP lining anticorrosion of the sewage pool.

JIAXING NANYANG WANSHIXING CHEMICAL CO., LTD. focuses on the research and production of epoxy resin adhesive, and provides customized application solutions of epoxy resin adhesive, which can be widely applied in various industries and areas such as new energy, military, medical, aviation, shipping, electronic, automobile, instrument, power supply, high-speed rail and so on. Welcome to consult us and purchase it!

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

What Do You Know about Methyltetrahydrophthalic Anhydride(2021年06月01日)

wsxchem — 2021-05-28T10:31:21+0900

https://www.wsxchem.com/mthpa/

I don't know if you are familiar with methyltetrahydrophthalic anhydride. In fact, some people are not too familiar with it. In fact, what many people have always wondered is what are the functions of methyltetrahydrophthalic anhydride and the precautions for use. Next, the following editor will help you summarize the relevant knowledge.

Methyltetrahydrophthalic anhydride is used as epoxy resin curing agent, solvent-free paint, laminates, adhesives, etc. It has excellent properties such as long-term coexistence at room temperature, low freezing point, and low toxicity. It is widely used in the electronic and electrical industry, such as: dry type transformers, insulators, insulating basins, insulating sleeves, insulating paint, high voltage switches, transformers, line output transformers, electric power and household capacitors, petroleum pipelines. Methylhexahydrophthalic anhydride is especially suitable for outdoor use places, such as outdoor transformers, light-emitting diodes, and oils, in addition to the above-mentioned fields.

In recent years, due to the rapid development of automatic molding technology for epoxy insulating products, new insulating materials using this type of products as raw materials have replaced traditional materials such as bakelite, SMC, porcelain, etc., and are widely used as epoxy insulating materials. And the market demand is increasing.

With the rapid development of China's four pillar industries of the electronic and electrical industry and the transfer of the world's manufacturing centers for such products to China, the application of epoxy resins in this field is bound to increase significantly, and it is matched with the acid anhydride curing agent used in this field. It will also grow simultaneously. By 2015, the acid anhydride curing agent used in the electronic and electrical industry in my country will reach 200,000 tons, of which, it can reach 40,000 tons only for dry-type transformers. The main varieties are methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride. Especially with the vigorous development of the wind power industry, the corresponding demand for composite materials such as resins and coatings for wind turbine components is increasing, which has found a new growth point for the market application of acid anhydride curing agents.

The above summary of the knowledge about methyltetrahydrophthalic anhydride, I wonder how much knowledge you have learned after reading it.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

What Uses Does the Product of Methyltetrahydrophthalic Anhydride Have?(2021年)

wsxchem — 2021-05-08T11:16:45+0900

https://www.wsxchem.com/mthpa/

What are the uses of the products of methyltetrahydrophthalic anhydride? Methyltetrahydrophthalic anhydride is a high-precision chemical substance. The products produced are synthesized by a very unique secret recipe. The products of methyltetrahydrophthalic anhydride are generally pure It is very high. What use do we say below the products of methyltetrahydrophthalic anhydride?

Methyltetrahydrophthalic anhydride products are mainly used as curing agents for epoxy resins and also used in synthetic methods such as unsaturated polyester resins, epoxy curing agents, pesticide intermediates, and potting of dry-type transformers.

Derived from the reaction of isoprene and maleic anhydride. The industrial synthesis of methyl tetrahydrophthalic anhydride is obtained by isomerizing maleic anhydride and methyl butadiene through diene synthesis.

The product of methyltetrahydrophthalic anhydride, cracking raw material C5 is pretreated by DMF extraction distillation, cutting the middle distillate rich in methylbutadiene, and reacting with maleic anhydride in a solvent. After the reaction is over, the unreacted components are evaporated, and then isomerized into liquid acid anhydride, and the finished product is obtained through vacuum distillation. The C5 fraction extracts the remaining part of methyl butadiene to catalyze the synthesis of semi-polished resin, and the by-product mineral spirits.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

Product Characteristics of Methyltetrahydrophthalic Anhydrid(2021年)

wsxchem — 2021-05-08T11:16:20+0900

https://www.wsxchem.com/mthpa/

Methyltetrahydrophthalic anhydride refers to a chemical material. Methyltetrahydrophthalic anhydride is usually used as an additive and is rarely used alone. Methyltetrahydrophthalic anhydride epoxy resin curing agent is a product of methyltetrahydrophthalic anhydride. Today, I will introduce the characteristics of the material of methyltetrahydrophthalic anhydride, and master its production function by understanding its characteristics.

Performance characteristics of liquid methyltetrahydrophthalic anhydride (C9H10O3):

1. High purity, light color: epoxy resin curing agent products of various colors can be directly prepared or prepared.

2. Low viscosity: good manufacturability of casting and potting. A large amount of filler can be added during casting to make the cured product have excellent performance.

3. Stable performance: long pot life, low freezing point, long-term storage at room temperature.

4. Low volatility: low toxicity and low heating loss, and the toxicity is only one fortieth of the amine curing agent.

The use of methyltetrahydrophthalic anhydride can obtain high-quality cured products. The cured products not only have higher mechanical strength, but also have good electrical properties, heat resistance and corrosion resistance. The methyltetrahydrophthalic anhydride produced by our company has good transparency, weather resistance and potting and casting stability. It is especially suitable for white potting casting materials and is an ideal curing agent to replace methyltetrahydrophthalic anhydride produced in Japan. During the storage and transportation of this product, take care to avoid light, seal and moisture. If stored improperly, precipitation will occur after absorbing moisture, just need to open and heat to about 140 ℃ to restore the original state without affecting the original performance.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

Methyl Hexahydrophenylanhydride Uses Sharing(2021年)

wsxchem — 2021-05-08T11:15:50+0900

https://www.wsxchem.com/mthpa/

1. Curing agent for epoxy resin: Methylhexahydrophthalic anhydride is a heat-curable acid anhydride curing agent, mainly used in the electrical and electronic fields. It has a low melting point and a low viscosity for its complex with cycloaliphatic epoxy resin. Long pot life, high heat resistance of the cured product, good high-temperature electrical performance, can be used for the impregnation of electrical equipment coils, the casting of electrical components, and the sealing of semiconductors, such as casting outdoor insulators, light-emitting diodes (LED), ignition coils, and special applications capacitors, transformers, motors, sports, and entertainment equipment and other fields that require good resistance to outdoor ultraviolet light and humidity.

2. The application of epoxy-based composite material methylhexahydrophthalic anhydride in high-performance composite materials is also becoming more and more extensive, and its application in lamination, centrifugal casting, pultrusion, and other aspects together with fiber reinforced materials has become more and more popular such as pressure cylinders, pressure pipes, fishing rods, golf clubs.

3. Adhesive: The refractive index of the cycloaliphatic epoxy adhesive made of methylhexahydrophthalic anhydride is similar to that of optical glass, the internal stress after curing is small, the bonding strength is high, the color does not change, the aging resistance is suitable for large-area optical parts bonding.

Pay attention to storage, packaging, and transportation. Choose 25 kg plastic drums or 220 kg iron drums. Methylhexahydrophthalic anhydride must be moisture-proof, fire-proof, and waterproof during transportation and stored in a dry and ventilated warehouse.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know more? Please contact us.

The Summary of the Characteristics and Curing Mechanism of Acid Anhydride Curing Agent(2021年)

wsxchem — 2021-05-08T11:15:17+0900

https://www.wsxchem.com/resources/what-is-epoxy-hardener-made-of.html
https://www.wsxchem.com/resources/acid-anhydride-curing-agent-guide.html
https://www.wsxchem.com/resources/basic-information-and-properties-of-mthpa.html

1. The characteristics of acid anhydride curing agent

1) Acid anhydride curing agent also belongs to addition polymerization curing agent.

2) Application fields:

It is mainly used in large-scale casting and other occasions, and has also been widely used in small electrical appliances,especially in weak current aspects, such as the encapsulation of integrated circuits as well as capacitors.

3) Application advantages:
Compared with polyamine curing agent, acid anhydride curing agent has many advantages.

In terms of operating technology, there are mainly the following points:

Low volatility, low toxicity, and low skin irritation;

The mixing amount of epoxy resin is large, the viscosity is low after being mixed with epoxy resin adhesive, and more fillers can be added to modify, which is beneficial to reduce costs;

Long service life and easy operation.

From the perspective of the nature of the cured product, it has following main features:

The shrinkage rate is small due to the low curing reaction;

It has a higher heat distortion temperature, excellent heat resistance, and light color of the cured product;

It has excellent mechanical and electrical properties.

2. Mechanism of action

The curing reaction mechanism of acid anhydrides is divided into two forms according to the presence or absence of accelerators.

1) When there is no accelerator, firstly, the hydroxyl group in the epoxy resin reacts with the acid anhydride, opens the acid anhydride, and then performs the addition polymerization reaction.

2) In the presence of the accelerator, the acid anhydride curing reaction is accelerated by a Lewis base. The accelerator (usually tertiary amine) reacts with the acid anhydride, and the main reactions are:

The accelerator attacks the acid anhydride to generate carboxylate anion;

Oxygen anions react with other acid anhydrides to generate carboxylate anions again.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002 and so on. Want to know what is epoxy resin hardener? Want to know about curing agent definition and cas 26590 20 5? Please contact us.

The Acid Anhydride Curing Agent is Widely Used(2021年)

wsxchem — 2021-05-08T11:14:50+0900

https://www.wsxchem.com/mthpa/mthpa-wny1001.html
https://www.wsxchem.com/resources/cured-epoxy-melting-point.html
https://www.wsxchem.com/resources/what-is-epoxy-hardener-made-of.html

Among the curing agent products, acid anhydride curing agent occupies an important position, and it is one of the more widely used varieties of curing agent with large market usage. Epoxy resin adhesive and acid anhydride curing agents can be heated and then processed through various processes to form thermosetting adducts in different forms. The characteristics of the acid anhydride curing agents are small shrinkage, no by-products, good heat resistance, good sealing, good insulation, and large selectivity of various additives, which can be used in the fields of electronic potting, electrical casting, encapsulation, pultrusion, winding, laminated insulating materials and composite materials as well as powder coatings, etc.

1. Electronic potting
The electronic potting products from small electronic components to precision instruments, military communication products, and various electronic casting products, large transformers, from motor coils to current transformers in high-voltage electrical appliances, cable junction boxes and cable terminals, which indicates the acid anhydride curing agent has been widely used.

2. Pultrusion products
During pultrusion, the continuous glass fiber bundles, tapes or cloths impregnated with resin glue are used to continuously produce FRP profiles of unlimited length under the action of traction. This process is suitable for the production of FRP profiles with various cross-sectional shapes, such as rods, tubes, I-shaped, trough, square profiles and open-web profiles. In the production of pultrusion products, the acid anhydride curing agent generally adopts acid anhydride curing agent.

3. Molded plastic products
The molding compound is mainly used to encapsulate small electronic components such as transistors, integrated circuits, capacitors and resistors. It has the advantages of convenient operation, high production efficiency, and it can be used with more fillers.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002, anhydride curing agents for epoxy resins and so on. Want to know about cured epoxy melting point? Want to know what is epoxy hardener used for? Please contact us.

The Characteristics and Usage of Epoxy Resin Adhesive(2021年)

wsxchem — 2021-05-08T11:14:24+0900

https://www.wsxchem.com/mthpa/mthpa-wny1001.html
https://www.wsxchem.com/resources/basic-information-and-properties-of-mthpa.html
https://www.wsxchem.com/resources/what-is-epoxy-hardener-made-of.html

Epoxy resin adhesive is to reprocess or modify its characteristics on the basis of epoxy resin to make its performance parameters meet specific requirements, generally, epoxy resin adhesive also needs a curing agent before it can be used, and it needs to be evenly mixed before it can be completely cured. Generally, epoxy resin adhesive is called A glue or main agent, and curing agent is called B glue or curing agent (hardener).

1. THE CHARACTERISTICS OF EPOXY RESIN ADHESIVE

1) Basic characteristics: two-component glue, which needs to be mixed with AB glue, it has strong versatility and can fill larger gaps

2) Operating environment: it can be cured at room temperature, both indoors and outdoors, which can be mixed manually or use special equipment for AB glue (such as AB glue gun)

3) The applicable temperature is generally between -50℃ and +150℃

4) It is suitable for general environment, waterproof, oil resistance, strong acid and alkali resistance

5) It needs to be placed in a cool place away from direct sunlight, and the shelf life is 12 months

2. THE USAGE OF EPOXY RESIN ADHESIVE

1) Using dry cotton cloth or sandpaper to remove dust, oil stains, rust, etc. on the bonding surface, and then wipe with a cleaning agent such as acetone or trichloroethylene to clean the bonding surface.

2) Twisting off the front cover and stirring it evenly according to the weight ratio of agent A + agent B as described above (A:B=2:1). In order to ensure the effect of use, it can also be used after vacuuming .

3) It should noted that it must be used up within the operating time, otherwise it will solidify and cause waste of materials, while the highest strength can be obtained after 24 hours.

4) After gluing

Curing for 2~6 hours at room temperature , and 40°~50°C for 1~3 hours. Using it after applying glue for 24 hours, and after ten days, the adhesion will be better. In cold and humid days, bonding at room temperature of 15-25 degrees is better.

5) Bonding straight face
Epoxy resin adhesive is mainly suitable for bonding high temperature resistant metals and ceramics. Its working temperature is -50～+180℃, and it can reach +250℃ in a short time.

The use of epoxy resin adhesive requires more attention, which has a wide range of use, and the operation is relatively detailed. The effect is more obvious if the operation is done.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a professional epoxy hardener manufacturer. We provide MTHPA WNY1001, MTHPA WNY1002, anhydride cured epoxy, mthpa anhydride and so on. Want to know what is epoxy hardener made of? Please contact us.

How Long does the Epoxy Resin Adhesive Take to Cure? And How to Cure Quickly?(2021年)

wsxchem — 2021-05-08T11:13:47+0900

https://www.wsxchem.com/mthpa/mthpa-wny1001.html
https://www.wsxchem.com/resources/what-is-epoxy-hardener-made-of.html
https://www.wsxchem.com/resources/cured-epoxy-melting-point.html

1. HOW LONG DOES THE EPOXY RESIN ADHESIVE TAKE TO CURE?

Adding the curing agent to the epoxy resin adhesive, and the curing time is different according to different curing agent types and different external environments. The ratio of epoxy resin adhesive and curing agent generally follows the principle of equivalence, which does not mean that the more curing agent, the shorter the curing time, and the amount has no relationship with the curing time.

The curing time is mainly affected by the activity of the curing agent, among the curing agents at room temperature, aliphatic amines can basically be cured in five or six hours, and polyamides are slightly slower, but satisfactory results can also be achieved in two or three days. Of course, after the accelerator is added, the curing speed can be faster, but if the curing speed is too fast, the glue lacks a suitable process, and there is a risk of explosion when the temperature is high in summer.

The curing time of epoxy resin adhesive and curing agent is also related to curing temperature. Generally speaking, under the same curing agent conditions, the higher the temperature, the shorter the curing time. In order to meet different industrial uses, the epoxy resin adhesive produced in the market now has a curing time of a few minutes, one or two hours (under normal temperature or heating), and some can be completely cured under normal temperature conditions for more than ten or tens of hours. Also, there are some one-component UV-curable glues, the main component is also epoxy resin adhesive, which is cured by UV light, and the curing time only takes tens of seconds to two to three minutes.

2. THE CURING TIME OF EPOXY RESIN ADHESIVE IN WINTER

The temperature is one of the main reasons that affect the curing speed of epoxy resin adhesive. The higher the environment temperature, the faster the curing speed,the normal temperature for natural curing of epoxy resin adhesive is 25-30℃, and the minimum is not less than 20°C, the maximum temperature of baking-curing does not exceed 60°C. The temperature in most places in winter is relatively low, and most of them are below 0°C, such a curing environment will seriously affect the curing speed of epoxy resin adhesive, therefore, the low temperature in winter causes the exothermic chemical reaction of the epoxy resin adhesive to slow down, and the curing speed will also be slow.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is one of professional epoxy resin and hardener manufacturers. We provide MTHPA WNY1001, MTHPA WNY1002, anhydride hardener, epoxy resin hardener composition and so on. Want to know about cured epoxy melting point? Please contact us.

What is the Ratio of FRP Resin to Curing Agent?(2021年04月21日)

wsxchem — 2021-04-15T17:18:49+0900

https://www.wsxchem.com/what-is-the-ratio-of-frp-resin-to-curing-agent.html

1. WHAT IS THE RATIO OF FRP RESIN TO CURING AGENT?

The ratio of FRP resin to curing agent is generally about 2%, and the specific ratio depends on the requirements of curing time, as well as the addition of accelerator, environment temperature, humidity and other conditions. For example, when the humidity is high and the temperature is low, moderately increase the curing agent ratio. On the contrary, the proportion of curing agent can be appropriately reduced.

2. THE RAW MATERIAL RATIO OF SYNTHETIC FRP

1) Raw materials: resin, fiber products, curing agent, accelerator.

2) Ratio: curing agent 1%-2%, accelerator 1%-3% (determine the ratio yourself when conduct an experiments, there are many influencing factors), which can be calculated by quality.

3) Mechanism: Ratio-resin 30%, fiber 70%, some parts need to be strengthened.

4) Hand-made: ratio-resin 55-65%, fiber 45-35%, too much resin content will affect product toughness.

Curing too fast is beacuse of either too much curing agent or too much accelerator, which is more sensitive to humidity and temperature, and the curing time is not easy to grasp, therefore experiments should be done before using it.

Fiberglass (fiberglass) is also known as GFRP, that is, fiber-reinforced plastic, which is a composite material made by composite processes, using the glass fiber reinforced unsaturated polyester, epoxy resin adhesive and phenolic resin matrix, glass fiber (Glass fiber), carbon fiber or boron fiber as the reinforcing material.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. can provide you with products for winding glass fiber. We have strict production technology, advanced equipment, and strong technical force to ensure stable product quality and excellent performance, welcome to buy our products.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a epoxy hardener manufacturer, we provide MTHPA products, anhydride curing agents for epoxy resins, anhydride hardener, cas 26590 20 5 and etc. Want to know what is epoxy resin hardener or what is epoxy hardener used for? Please contact us.

What should be Paid Attention to when Using Clear Epoxy Adhesive to Metal(2021年04月20日)

wsxchem — 2021-04-15T17:18:07+0900

https://www.wsxchem.com/what-should-be-paid-attention-to-when-using-clear-epoxy-adhesive-to-metal.html

CHARACTERISTICS OF CLEAR EPOXY ADHESIVE

1. Clear epoxy adhesive has good sealing and chemical properties after it cured which can adapt to acid and alkali, high humidity, solvent, salt spray and other harsh environment; with the strong ability for anti-ultraviolet, the metal parts bonded of clear epoxy adhesive won't be easily fell off even in the outdoor by the corrosion of sunshine and rainfalls ;

2. A variety of shaping time: for those being fast, 3-5 minutes can be finalized while those being slower may need one or two hours to start curing which can adapt to more metal bonding process.

3. The ability of temperature resistance is also good. the normal clear epoxy adhesive can stand a high temperature about 100°C; some Clear epoxy adhesive can stand the high temperature up to 300°C which can adapt to more metal using environments.

SOME TIPS FOR USING CLEAR EPOXY ADHESIVE WITH METALS

1. The smoothness of the metal surface will have a great impact on the adhesive strength of clear epoxy adhesive. If permitted, the smooth metal surface can be brushed and washed with industrial alcohol solvent and then glued which can greatly improve the viscosity.

2. The rust, dust, rust-proof oil, release agent and other impurities on the metal surface should also be polished to clean because these will also have a great impact on the strength of metal clear epoxy adhesive.

3. Clear epoxy adhesive has two kinds of packaging: one uses tubular packaging, which is not recommended for those small amount adhesive just being produced because it will mix unevenly at the beginning; the other one adopts manual mixing. The proportion of adhesive should be carefully ensured, because the mixing adhesive more than the normal will affect the strength and curing time of clear epoxy adhesive metal.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a epoxy resin and hardener manufacturers, we provide cas 26590 20 5, cas 11070 44 3, anhydride cured epoxy and etc. Want to know what is epoxy resin hardener or what is epoxy hardener made of? Please contact us.

Why can Acid Anhydride Become a Kind of Curing Agent?(2021年04月19日)

wsxchem — 2021-04-15T17:17:20+0900

https://www.wsxchem.com/why-can-acid-anhydride-become-a-kind-of-curing-agent.html

Acid anhydride curing agent is another kind of epoxy resin curing agent after amine. The position of organic acid anhydride curing agent is very important which is characterized by it has at least one anhydride group in each molecule. Acid anhydride curing agent mainly includes fatty anhydride, alicyclic anhydride, aromatic anhydride, unsaturated anhydride and mixed anhydride. Compared with amine curing agent, acid phenol curing agent can endow epoxy resin with many new properties, such as higher reaction equivalent, smaller reaction heat, longer application period, lower curing shrinkage, better heat resistance and better electrical insulation. However, they are easy to being dump and hydrolyze; at higher temperature or under the catalysis of tertiary amines can form polymers which will result in increased viscosity and poor process performance.

Because of the weak reacting activity with epoxy resin, anhydride can cure epoxy resin well at a higher temperature, then the intermediate and epoxy groups of epoxy resin may be esterified with anhydride. The addition of a light amount of tertiary amines and phenols in the epoxy monohydride system can shorten the curing time, reduce the reaction temperature and inhibit the vinegar reaction. The reaction mechanism of catalyzing of tertiary amine anhydride cured epoxy resin is still controversial and many scholars support the proposed mechanism. First, tertiary amines form a zwitterionic pair with anhydride, in which the oxygen anion of the search group attacks the epoxy group to form the vinegar bond and a new alkoxy anion while it turn binds to the anhydride molecule to form a new ion pair to continue the open of the epoxy group. An epoxy-anhydride crosslinking network can be finally formed by the continuous reaction, chain expansion, branching and cross-linking as the above description.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a epoxy hardener manufacturer, we provide MTHPA products, anhydride curing agents for epoxy resins, anhydride hardener, mthpa anhydride and etc. Want to know what is epoxy hardener used for or epoxy hardener types? Please contact us.

Status and Progress of Epoxy Resin Coatings in Marine Anti-corrosion Field(2021年04月18日)

wsxchem — 2021-04-15T17:16:34+0900

https://www.wsxchem.com/status-and-progress-of-epoxy-resin-coatings-in-marine-anticorrosion-field.html

Epoxy coating is a kind of anticorrosive coating widely used at present which plays an important role in marine anticorrosive coatings. For a long time, epoxy coatings have become the favorite of marine anticorrosive coatings because of its features of corrosion resistance, chemical resistance, acid and alkali resistance, high strength, high hardness and wear resistance.

Epoxy coating is a kind of polymer with two or more epoxy groups in the molecule. After using with curing agent, it can form a coating with the matures of high hardness, high adhesion, high chemical stability and high corrosion resistance. At present, there are many types of epoxy coatings. The classification can be divided into BPA(bisphenol A) epoxy coating and phenolic aldehyde epoxy coating just by the basic material using of resin. After modification, the types of epoxy coatings become more diversified. The modification methods of epoxy coating include polymer modification, silicone modification and nano material modification then the coatings can attain more superior characteristics by doing so.

Epoxy resin has been developing continuously since its successful discovered and synthesis in 1930. The researchers studied a lot from epoxy coating itself to the structure and the modification of it. For a long time, epoxy coating is an important point in the field of anticorrosive coatings. Nowadays, under the environment of developing marine industry, the researches of anticorrosive coatings must be as the supports of the epoxy coating and epoxy coatings still have a good market prospect and application value in the modern society.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a epoxy resin and hardener manufacturers, we provide mthpa anhydride, anhydride hardener, anhydride cured epoxy and etc. Want to know cured epoxy melting point or what is epoxy hardener made of? Please contact us.

When can the Epoxy Resin Adhesive Function after Solidification(2021年04月11日)

wsxchem — 2021-04-15T17:15:54+0900

https://www.wsxchem.com/when-can-the-epoxy-resin-adhesive-function-after-solidification.html

Before the epoxy resin adhesive solidifies, the color of the A/B agent is different. Generally speaking, A agents are mostly some light yellow substances while B agents are black or brown substances. After solidified, the A/B agent will be fully mixed and then to form the brown or black substances.

In the environment about 80°C, epoxy resin adhesive will take two to three hours to complete curing; in the environment about 100°C, epoxy resin adhesive will take one to two hours to complete curing; in the environment of 150d°C, the curing can be completed within an hour. In short, the higher the temperature, the shorter time the curing will take of epoxy resin adhesive.

How is the strength of epoxy resin adhesive after curing?

No matter at a high temperature or a normal temperature, the curing of epoxy resin adhesive will form a glue skim. After the curing totally completed, the adhesion and strength of epoxy resin adhesive are getting better and better with certain toughness at the same time. It means they will own a protective skim to resist water, acid /alkali and high temperature which are suitable for long-term using. Concerning of the curing properties of epoxy resin adhesive, it can be used in many high-end fields. Not only to resist strike and pressure, but also can resist ageing so as to prolong its service time.

Everyone likes those competitive brand suppliers because they shows their guarantee to the customers; just like the JIAXING NANYANG WANSHIXING CHEMICAL CO.,LTD. specializing in the studies and techniques of epoxy resin adhesive, provides customized epoxy resin adhesive application solutions which are widely used like it can be used in new energy, military industry, medical treatment, aviation, ships, electronics industry, automotive, instruments, power industry, high-speed rail and other industries. You are warmly welcomed to come to us have the consultation and purchasing!

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a epoxy hardener manufacturer, we provide MTHPA products, anhydride curing agents for epoxy resins, anhydride hardener, anhydride cured epoxy and etc. Want to know curing agent definition or epoxy hardener uses? Please contact us.

Application of Epoxy Resin Adhesive in UAV Industry(2021年04月16日)

wsxchem — 2021-04-15T17:15:01+0900

https://www.wsxchem.com/resources/application-of-epoxy-resin-adhesive-in-uav-industry.html

Called "unmanned aerial vehicle", UAV is operated by radio remote control equipment and independent program control equipment. Or it can be operated completely or intermittently on an on-board computer.

Drones are generally more suitable for "dirty or dangerous" tasks than manned aircraft. According to the application field, UAV can be divided into military and civil. In the military, UAVs are divided into reconnaissance aircraft and target aircraft. Civil UAV + industrial application is the real demand of UAV. At present, the UAV is engaged in aerial photography, agriculture, plant protection, micro selfie, express delivery, disaster relief, wildlife observation, infectious disease monitoring, mapping, news reporting, power patrol in inspection, disaster relief, film and other fields of application and television shooting. Romance has greatly expanded the use and development of UAV itself. Developed countries are also actively expanding the application of UAV Technology.

Drones make romance

Small drones are very useful. It needs glue in many places. Here, Henkel introduces the adhesive points of UAV and the corresponding bonding scheme.

External adhesive

Camera lens fixation of UAV

Henkel recommends using Loctite 3335UV adhesive for fixation. The focus of the lens module is fixed with ordinary UV glue. After a certain period of aging of double 85, the focus of the product will shift after vibration, resulting in blurred image. (reason: UV glue belongs to the type of glue with strong moisture absorption. When it is in the high temperature and humidity environment of double 85, the glue will shrink and expand by heat absorption). Therefore, it is recommended to use UV epoxy glue 3335 of Celeste. Letai 3335uv adhesive has the technical characteristics of high hardness, strong environmental resistance and low expansion coefficient. Loctite 3335UV adhesive can mainly play the role of bonding, coating and positioning on metal, plastic or glass substrate. And the shrinkage rate is low when curing, after curing, it has excellent heat resistance, water resistance and chemical resistance.

Camera lens fixation of UAV

Glue for UAV platform

The UAV dome is the supporting equipment for UAV to install and fix the camera and other task loads. If you want to take good photos, you must ensure the stability of the platform. The material of the glue point of the platform is generally nylon and stainless steel, because it needs to bear a large tensile force. Henkel recommends loctite 326 structural adhesive. Loctite 326 structural adhesive is a kind of high-strength multi-purpose adhesive, which can provide the strength of epoxy resin and the curing speed of instant dry adhesive, and has good solvent resistance. It can cure in a few minutes and is suitable for conditions requiring rapid fixation.

Jiaxing Nanyang Wanshixing Chemical Co., Ltd. is a epoxy resin and hardener manufacturers, we provide MTHPA products, anhydride curing agents for epoxy resins, anhydride hardener, anhydride cured epoxy and etc. Want to know curing agent definition or epoxy hardener uses? Please contact us.

Curing Temperature of Curing Agent(2021年04月15日)

wsxchem — 2021-04-15T17:14:11+0900

https://www.wsxchem.com/curing-temperature-of-curing-agent.html

Different curing agents have different curing temperature and cured products are diverse in heat resistance. Generally speaking, the curing agent with high curing temperature can produce excellent heat-resistant cured materials. For addition polymerized curing agents, the curing temperature and heat resistance are increased in the following order: aliphatic polyamines < alicyclic polyamines < aromatic polyamines ≈ phenolic < anhydride.

Most of the heat resistance of addition polymerized curing agents is equal to that of aromatic polyamines. The high temperature resistance of curing agent of anionic polymerization type (tertiary amine and imidazole compound) and cationic polymerization type (BF3 complex) are basically the same. The main reason is that although the initial reactive mechanism in producing the curing agents are different, the final formation will always be ether bond network structure.

The curing reaction is a chemical reaction, which is greatly affected by the curing temperature. When the temperature increases, the reaction speed will accelerate and the gel time will shorten. The logarithm of gel time declines linearly with higher curing temperature. However, if the curing temperature is too high, the performance of the curing agents will decrease. Thus there is an upper limit of the curing temperature. A suitable curing temperature should be chosen which can balances the curing speed and the performance of the curing agents.

According to the curing temperature, curing agents can be divided into four categories: the low-temperature curing agent whose curing temperature is below room temperature; the room-temperature curing agent whose curing temperature is between room temperature and 50℃; the medium-temperature curing agent whose curing temperature is 50-100 ℃; the high-temperature curing agent whose curing temperature is above 100℃. There are few kinds of low-temperature curing agent: polyarylcohol type, polyisocyanate type and so on. T-31 modified amine and YH-82 modified amine developed and produced domestically can be cured below 0℃. There are many kinds of room-temperature curing agent: aliphatic polyamines, alicyclic polyamines, low molecular polyamides and modified aromatic amines. Some aliphatic polyamines, tertiary amines, imidazoles and boron trifluoride complexes belong to moderate-temperature curing agent. Aromatic polyamines, anhydrides, first-order phenolic resin, amino resin, dicyandiamide and hydrazide are high-temperature curing agents.

What Is The Ratio Of Epoxy and Hardener?(2020年01月15日)

wsxchem — 2020-01-09T14:59:37+0900

http://www.wsxchem.com/resources/what-is-the-ratio-of-epoxy-and-hardener.html

Epoxy hardener calculation

1. Amine curing agents

2. Calculating the dosage of low relative molecular weight Polyamide

W(polyamide)%=(56100/amine value*f)*epoxy value n-3

3. Calculating the dosage of ketoimide

W(ketoimide)%=(curing agent equivalent/epoxy equivalent)*100

"Equivalent" here means that ketimine reacts with water at the same time.

As a one of the most professional epoxy resin and hardener manufacturers, WSX Chemical covers an area of 4 acres with more than 60 employees. We have four advanced production lines and our annual production capacity is 30000 tons, is the largest manufacturer of MTHPA products in China. We sincerely invite and welcome people from all around the world to invest and create more values together.

What Is Epoxy Hardener Made Of(2020年01月15日)

wsxchem — 2020-01-09T14:58:56+0900

http://www.wsxchem.com/resources/what-is-epoxy-hardener-made-of.html

A lot of people have a question: Is epoxy glue heat resistant ?
The epoxy resin itself is a thermoplastic linear structure. After heating, the solid resin can be softened and melted into a viscous or liquid state. The thermal viscosity of liquid resin decreases. Only when curing agent is added, epoxy hardener chemistry can be used practically.

Composition of epoxy resin

A. Resin Composition
(1) Epoxy resin: Main component of resin composition, Bisphenol A epoxy resin and other types of epoxy resin
(2) Curing agent: reacting with epoxy resin to form three-dimensional network polymer compounds

D. Other ingredients: pigments, solvents, defoamers, levelers, tackifiers, etc.

Epoxy resins can be widely used because of the combination of these components. Especially curing agent, once the epoxy resin is determined, curing agent plays a decisive role in the technological properties of epoxy resin components and the final properties of curing agent products (products). Epoxy resin itself is a linear structure of thermoplasticity. It can not be used directly. A second component must be added to the resin. Under certain temperature (or humidity) and other conditions, epoxy group of epoxy resin is used for addition polymerization or catalytic polymerization to produce cured materials with three-dimensional network structure (bulk network structure). This compound or resin, which acts as the second component, is called curing agent and is divided into additive curing agent and catalytic curing agent.

Curing agent:

A. Normal temperature curing

B. Heating curing

WSX Chemical covers an area of 4 acres with more than 60 employees. We have four advanced production lines and our annual production capacity is 30000 tons, is the largest manufacturer of methyltetrahydrophthalic anhydride in China. We sincerely invite and welcome people from all around the world to invest and create more values together.

Is Epoxy Resin Heat Resistant?(2020年01月14日)

wsxchem — 2020-01-09T14:58:15+0900

http://www.wsxchem.com/resources/is-epoxy-resin-heat-resistant.html

Is epoxy glue heat resistant?
1. Epoxy resin AB adhesive classification: can be divided into epoxy resin filling adhesive, epoxy resin thermal conductive adhesive, epoxy resin sealant, epoxy resin high temperature adhesive, epoxy resin fast-drying adhesive.

Curing Mechanism of Epoxy Resin(2020年01月13日)

wsxchem — 2020-01-09T14:57:34+0900

http://www.wsxchem.com/resources/curing-mechanism-of-epoxy-resin.html

Are you looking for epoxy curing mechanism? The principle of epoxy resin hardening reaction is not perfect at present. According to the different hardeners used, it is generally believed that epoxy resin can be thermosetting products through four ways of reaction.

(1) Open-ring connection between epoxy groups;

(2) The epoxy group reacts with the hardener with the active hydrogen functional group and crosslinks.

(3) The epoxy group is crosslinked by the reaction of aromatic or fatty hydroxyl groups in the hardener.

(4) Crosslinking of epoxy group or hydroxyl group with group of hardener

Different kinds of hardeners play different roles in the hardening process. Some hardeners, such as amines, alcohols and phenols, which have single reaction groups, do not participate in the hardening process and only play a catalytic role. The hardener participates in the reaction between macromolecules during the hardening process and forms part of the hardening resin, such as polyamines, polyols, polyanhydrides and other compounds containing multiple reaction groups.

Basic Information and Properties of MTHPA(2020年01月12日)

wsxchem — 2020-01-09T14:56:58+0900

http://www.wsxchem.com/resources/basic-information-and-properties-of-mthpa.html

Methyl tetrahydrophthalic anhydride is a chemical with a molecular formula of C9H10O3.

Second, basic performance.
Methyl tetrahydrophthalic anhydride, referred to as MTHPA anhydride, MeTHPA, has two isomers, namely 4-methyltetrahydrophthalic anhydride and 3-methyltetrahydrophthalic anhydride, having a melting point of 65 °C and 63 °C. It is rarely used as a curing agent alone. The actual commodity is a liquid mixture that isomerized to various isomers. The molecular weight is 166.17, and light yellow color, transparent oily liquid, relative density of 1.20 - 1.22. Freezing point < -20 °C. The boiling point is 115-155 °C. Viscosity (25 °C) 40 - 80 mPa · s. The refractive index is 1.4960 to 1. 4980. The anhydride group content is ≥ 40%. The neutralization equivalent is 81-85. The flash point is 137 - 150 °C. Soluble in acetone, ethanol, toluene, etc. It has good stability in air and is not easy to precipitate crystals. Low toxicity, LD502102mg/kg.

Acid Anhydride Curing Agent Guide(2020年01月11日)

wsxchem — 2020-01-09T14:56:14+0900

http://www.wsxchem.com/resources/acid-anhydride-curing-agent-guide.html

The curing reaction mechanism of anhydrides can be divided into two forms according to the presence or absence of accelerators.

accelerator attacked anhydride to form carboxylate anion.
carboxylate anion reacts with epoxy group to form oxygen anion.
oxygen anion reacts with other anhydrides to form carboxylate anion again.

WSX Chemical covers an area of 4 acres with more than 60 employees. We have four advanced production lines and our annual production capacity is 30000 tons, is the largest manufacturer of methyltetrahydrophthalic anhydride in China. To learn more about curing agent definition, please contact us!

MTHPA WNY1001(2020年01月10日)

wsxchem — 2020-01-09T14:55:25+0900

http://www.wsxchem.com/mthpa/mthpa-wny1001.html
Our company produces a new type of liquid organic acid anhydride epoxy resin curing agent with excellent performance Methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA). Because the anhydride curing agents for epoxy resins have better heat resistance and chemical stability than the amine curing agent, and can maintain excellent physical and electrical properties at higher temperatures. In recent years, anhydride hardener has been insulated with the motor, electronics and electrical industries. The continuous improvement of structural reliability requirements has led to the rapid development of the application of such curing agents. The specific introduction of our MTHPA product WNY-1001 is below:

Chemical Name: Methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA)
Specification: WNY-1001
Molecular formula: C9H10O3
Molecular weight: 166.178
CAS No.: 26590-20-5 11070-44-3
EC：247-830-1

PHYSICAL AND CHEMICAL PROPERTIES:
-High purity and light color: The color of epoxy resin products is light yellow, which can be directly produced or produced into various colors required.
-Low viscosity: Good processing properties for casting, potting, winding, bonding, lamination, impregnation, molding and dipping. A large amount of filler can be added during casting to make the cured product excellent in performance.
-Stable performance, low solidifying point, long application period: long-term storage at room temperature.
-Low toxicity: Toxicity is only one-twentieth to one-fortyth of the amine curing agent.
-Low volatility: Sealed preservation.
-Low heating loss.
-Good mutual solubility: This product can be miscible with all epoxy resins, the mixing viscosity is low, and the shrinkage rate of the system is small when heated and cured.
-Application: More suitable for white encapsulation.

TECHNICAL DATA SHEET:
ItemWNY1002WNY1001WNY1008
Appearancelight yellow transparent liquid, no mechanical impurities.
Color (Pt-Co)300# Max200# Max
Density (g/cm3 , 20℃)1.21 ± 0.05
FreezingPoint(℃)-15 Max0 Max
Viscosity (Pa.s, 25℃)0.060 Max0.045 Max0.040 Max
Acid Value(mgKOH/g)660-685
Anhydride content41.5% Min
Volatile content (120℃)2.00% Max
Free acid0.50% Max

Above are standard grades, anhydride mixtures and different isomer structures can be offered.

(Mixture of 3- and 4- Isomers)

MTHPA(2020年01月09日)

wsxchem — 2020-01-09T14:53:46+0900

http://www.wsxchem.com/mthpa/
OVERVIEW
Methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA) is a new type of liquid organic acid anhydride epoxy resin curing agent with excellent performance. Because the anhydride curing agent has better heat resistance and chemical stability than the amine curing agent, and can maintain excellent physical and electrical properties at higher temperatures, in recent years, it has been insulated with the motor, electronics and electrical industries. The continuous improvement of structural reliability requirements has led to the rapid development of the application of such curing agents.

Methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA) is a high performance product of anhydride curing agent. Its performance characteristics include high purity, light color, low viscosity, low volatility, low toxicity, low heating loss, stable performance, long pot life, and freezing point. Long-term storage at low and room temperature.

This product is widely used in epoxy potting materials, casting materials, bonding, lamination, impregnation, molding and winding processes, as well as insulation bushings, oil pipelines, fishing machinery and so on. For example: casting and filling electronic components, large dry-type transformers, high-voltage switches, capacitors, current and voltage transformers, large and micro motors, line output transformers, large resin insulators, etc. It is understood that the epoxy resin curing agent used in the manufacture of wind power blades and hubs is mainly an acid anhydride curing agent such as methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA) or methyl hexahydrophthalic anhydride.