年表作成・共有サービス - pastport

https://www.shanhucolor.com/products/pigment-red/

1. Organic pigment color

The color of the pigment is the most characteristic property of the pigment performance, especially the color of the coloring pigment and the color of the pigment is closely related to its chemical composition. A certain range of changes, although the chemical composition is the same, the crystal structure is not necessarily the same, the differences in particle size, particle size distribution, impurity content, etc. will cause differences in color and light, and color is extremely sensitive to these factors, and the human eye is extremely sensitive to color. Sensitivity, which is why it is difficult to control the absolute consistency of pigment shades.

The iron red produced by the same process has different colors due to different particle size and composition ratio, although the chemical composition is the same.

2. The hiding power of organic pigments

The pigment is added to the transparent base to make it opaque, and the minimum pigment required to completely cover the black and white grid of the base is the hiding power.

The optical nature of hiding power is caused by the difference between the refractive index of the pigment and its surrounding medium. When the refractive index of the pigment is equal to the refractive index of the binder, it is transparent, and it appears when the refractive index of the pigment is greater than that of the binder. The greater the difference between the two, the stronger the hiding power.

3. The tinting strength of organic pigments

The tinting strength is the result of the absorption and scattering of light by the pigment, which mainly depends on the absorption. The greater the absorption capacity, the higher the tinting strength. The chemical composition of different pigments, in general, the pigments of similar shades, the organic pigments are more colored than the inorganic pigments much stronger.

For pigments with the same chemical composition, the fluctuation of tinting strength depends on the size, shape, particle size distribution, crystal structure, and tinting strength of the pigment particles. It is also related to the dispersion of the pigment particles. The finer the dispersion, the stronger the tinting strength. Therefore, in order to improve the tinting strength, it is necessary to pay attention to the post-processing of the pigment, so that the tinting strength can be exerted better.

4. Organic pigment stability

The chemical composition of pigments is the main indicator of the difference between pigments. Pigments with different chemical compositions have different physical properties such as color, covering power, tinting strength, particle size, crystal structure, surface charge and polarity, and also determine the physical properties of pigments. The chemical properties of pigments vary.

Generally speaking, according to the nature and application of the pigment, the pigment is required to have a stable chemical composition and not be affected by the external environment. The chemical stability of the pigment will limit the use of some pigments. For example, lead-containing pigments can interact with H2S in the atmosphere. The reaction produces black lead sulfide, which makes the pigment dark and black, and sometimes its instability is used for some purpose. For example, pigments are basically insoluble in water, but for the purpose of anti-rust, anti-fouling or deliberately adding a certain medium to make them slightly water-soluble or the substrate to undergo a slight chemical reaction to protect the substrate.

5. Chemical resistance of organic pigments

The most essential nature of a pigment should be an inert substance, and it is difficult for a specific pigment to not react with any substance. At this time, it is required to make use of strengths and avoid weaknesses. The chemicals that the general coatings come into contact with are nothing more than acids, alkalis, salts, water, corrosive gases, organic solvents, etc. For example, iron yellow is more resistant to alkali and light than chrome yellow, so iron yellow can be used in architectural coatings.

6. Weather resistance, light resistance and heat resistance of organic pigments

The light resistance, weather resistance and heat resistance of pigments are the indicators of pigment performance in application, which directly affect their use value. Usually inorganic pigments pass through sunlight, and the action of the atmosphere will cause the color to darken and darken. In the same case, organic pigments are mostly faded.

In order to improve the light resistance, weather resistance, heat resistance and other properties of the pigment, for example: adding various chemical substances without changing the lattice structure, coating the surface of the pigment, passivating its surface, etc. Due to different treatment methods, different pigment varieties with unified chemical composition can be formed, which can be selected and used for different purposes.

As one of the most professional organic pigment manufacturers, we provide organic red pigment, the red pigment, pigment red, pigment coating, etc. For more information about organic pigments vs inorganic pigments, please feel free to contact us!