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As we all know, colorants are basically divided into organic pigments, dyes, and inorganic pigments. Organic pigments have developed rapidly recently. What are the similarities and differences with the other two colorants?

1. The similarities and differences between organic pigments and dyes

Both organic pigments and dyes are colored organic compounds. From the chemical structure of organic pigments and dyes, the two are very similar, and even some organic compounds can be used as both dyes and organic pigments, but organic pigments and dyes do Are two different concepts, the difference between them is mainly the application performance is different.

The traditional use of dyes is to dye textiles, while the traditional use of pigments is to color non-textiles such as inks, paints, coatings, plastics, rubber, etc. This is because dyes have affinity (or directness) to textiles and can be adsorbed and fixed by fiber molecules; while pigments have no affinity for all coloring objects, and mainly rely on resins, adhesives and other film-forming substances to combine with the coloring objects together.

In the process of use, dyes are generally first dissolved in the use medium. Even disperse dyes or vat dyes undergo a process of first dissolving in water from a crystal state to a molecular state and then dyeing on the fiber during dyeing. Therefore, the color of the dye itself does not represent its color on the fabric.

During the use process, the pigment always exists in the original crystal state because it is insoluble in the use medium. Therefore, the color of the pigment itself represents its color in the substrate. Because of this, the crystal state of the pigment is very important to the pigment, while the crystal state of the dye is not so important, or the crystal state of the dye itself is not closely related to its dyeing behavior.

Although pigments and dyes are different concepts, they can be used in common in certain situations. For example, some anthraquinone vat dyes, which are insoluble dyes, can also be used as pigments after pigmentation. Such dyes are called pigment dyes, or dye pigments.

2. The similarities and differences between organic pigments and inorganic pigments

Compared with inorganic pigments, organic pigments have many unique advantages. By changing the molecular structure of organic pigments, a wide variety of varieties can be prepared, and they have more vivid colors and brighter hues than inorganic pigments.

Organic pigments also have much higher tinting strength than inorganic pigments, and can be prepared into varieties with high tinting strength and high transparency to meet the requirements of high-grade coatings and printing inks. Most organic pigment varieties are less toxic, while most inorganic pigments contain heavy metals, such as chrome yellow, red red, vermilion, etc., which have certain toxicity.

Low-grade organic pigments are inferior to inorganic pigments in terms of light fastness, weather fastness, heat resistance and solvent resistance, but some high-grade organic pigments (such as quinacridone pigments, phthalocyanines, etc.) Pigments, etc.) have excellent light fastness, weather fastness, heat resistance and solvent resistance, and their acid/alkali resistance is also better than inorganic pigments, because some inorganic pigments have poor acid/alkali resistance. Such as: chrome yellow will turn black in the presence of hydrogen sulfide, red in the presence of alkali; ultramarine blue is easily decomposed by acid.

The variety, type, output and application range of organic pigments are constantly growing and expanding, and they have become an important class of fine chemical products.

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