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Ⅰ. Classification of organic pigments

1. According to the function of pigments, they are divided into: ordinary pigments, fluorescent pigments, pearlescent pigments, color-changing pigments, etc.;

2. According to the pigment application object, it is divided into: special pigment for paint and coating, special pigment for ink, special pigment for plastic and rubber, special pigment for cosmetics, etc.

3. According to the color body of pigment molecules, it is divided into two categories: azo pigments and non-azo pigments.

Ⅱ. Azo organic pigments

1. Monoazo yellow and orange pigments

There is only one azo group in the molecule, the chromatography is yellow and orange, and the coupling components are mainly acetoacetanilide and its derivatives and pyrazolone and its derivatives. The manufacturing process is relatively simple and there are many varieties.

Most of them have good light fastness, but solvent resistance and migration resistance are not ideal. Mainly used for general quality air-drying paint, latex paint, printing ink and office supplies.

Such as: Hansa Yellow 10G (C.I. Pigment Yellow 3).

2. Disazo Pigment

The molecule contains two azo groups. The production process is relatively complicated, and the color spectrum has yellow, orange and red. Light fastness is not ideal, but solvent resistance and migration resistance are good.

Mainly used in general quality printing inks and plastics, less in coatings. Such as: Benzidine Yellow (C.I. Pigment Yellow 12).

3. b-naphthol series pigments

From the chemical structure point of view, it is also a monoazo pigment, with b-naphthol as the coupling component. The color spectrum is mainly orange and red. Light fastness, solvent resistance and migration resistance are ideal, but not alkali resistance. The difficulty of the production process is the same as that of monoazo pigments in the general sense.

Mainly used for paints and coatings that require higher light fastness. Such as: Toluidine Red (C.I. Pigment Red 3).

4. Chromophenol AS series pigments

Refers to those monoazo pigments with chromophenol AS and its derivatives as coupling components. The color spectrum is yellow, orange, red, violet, magenta, brown and violet. Light fastness, solvent resistance and migration resistance are average.

Mainly used for printing inks and paints. Such as: Permanent Red FR (C.I. Pigment Red 2).

5. Azo lake pigments

The precursor is a water-soluble dye, which contains sulfonic acid group and carboxylic acid group in the molecule, and forms a water-insoluble pigment after interacting with a precipitant. The production difficulty is the same as the general monoazo pigments. The color spectrum is mainly yellow and red. Light fastness, solvent resistance and migration resistance are average.

Mainly used for printing ink. Such as: Golden Red C (C.I. Pigment Red 53).

6. Benzimidazolone Pigment

The molecule contains 5-amidobenzimidazolone group, which belongs to azo pigment in chemical classification and is a kind of high-performance organic pigment.

Their application performance and various fastnesses cannot be compared with other azo pigments. Suitable for most industrial sectors. It is mainly used in high-end occasions, such as original topcoat and refinish paint for cars, exterior wall coatings for high-rise buildings, and high-grade plastic products. Such as: Permanent Yellow S3G (C.I. Pigment Yellow 154).

7. Azo Condensation Pigments

It is formed by the condensation of two monoazo pigments containing carboxylic acid groups by a divalent aromatic amine. The production process is more complicated, and the color spectrum is mainly yellow and red. Light fastness, solvent resistance and migration resistance are very good.

Mainly used for dope coloring of plastics and synthetic fibers. Such as: Gumei Deyellowing 3G (C.I. Pigment Yellow 93).

8. Metal complex pigments

It is a complex of azo compounds and nitrogen methine compounds and transition metals, and there are few varieties. Has high light fastness and weather fastness. The transition metals used are mainly nickel, cobalt, copper and iron, and their color spectrum is mostly yellow, orange and green.

Mainly used for automotive paint and other coatings. Such as: C.I. Pigment Yellow 150.
Ⅲ. Non-azo organic pigments

Non-azo pigments generally refer to polycyclic or condensed ring pigments.

1. Phthalocyanine Pigment

The phthalocyanine compounds used as pigments are actually mainly copper phthalocyanine (CuPc) and its halogenated derivatives. The color spectrum is mainly blue and green. It has high application fastness and is suitable for use in various occasions. Such as: Phthalocyanine Blue B (C.I. Pigment Blue 15).

2. Quinacridone pigments

The chemical structure is tetrahydroquinoline diacridone. Has high light fastness and weather fastness. Chromatography is mainly red-purple, often called phthalocyanine red. The production process is quite complicated.

It is mainly used to modulate high-grade industrial paints, such as the original topcoat and refinish paint of cars, and outdoor advertising paint. Such as: Phthalocyanine Red (C.I. Pigment Violet 19).

3. Thio indigo pigments

Sulfur indigo itself has little industrial value, but its chlorinated or methylated derivatives are more valuable as pigments. Has high light fastness, weather fastness and thermal stability. The production process is not very complicated, and the color spectrum is mainly red and purple.

Commonly used in car paint and high-grade plastic products, can also be used as food coloring. Such as: Cosmetic Pink RC 01 (C.I. Pigment Red 181).

4. Anthraquinone Pigment

Refers to a class of pigments containing anthraquinone structure in the molecule or using anthraquinone as a starting material, and was originally used as a vat dye. The color is very strong and the color spectrum is wide, but the production process is very complicated, so that the production cost is very high.

According to their structure, they can be further divided into:

① Anthrapyrimidine pigments;

② Indanthrone pigments;

③ Pyreneanthrone pigments;

④ Dibenzopyrenedione pigments.

5. Dioxazine Pigment

The parent body is triphenyldioxazine, which is orange in itself and has no value as a pigment. Its 9,10-dichloro derivative can be used as a violet pigment after pigmentation.

There are fewer varieties. The most typical variety is Everlasting Violet RL (C.I. Pigment Violet 23). The pigment is resistant to almost all organic solvents and can be used in many application media with good fastness properties. Its tinting strength is exceptionally high, giving satisfactory depth of color in very small quantities.

6. Triarylmethane pigments

A cationic compound with at least two of the three aromatic rings bearing an amino group (or substituted amino group).

There are two types, one is in the form of an internal salt, that is, the molecule contains a sulfonic acid group, which forms an internal salt with the parent cation; the other is a salt formed by the parent cation and a complex anion.

The characteristic is that the color is very bright and the tinting strength is very high, but the fastness is not very good. The color spectrum is blue and green, and it is mainly used for printing ink. Such as: Radiant Blue R (C.I. Pigment Blue 61); C.I. Pigment Violet 3.

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