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Types of organic pigments belong to the colored compounds used in different fields. Colored substances can be divided into two categories: inorganic colored substances and organic colored substances. Except for a few natural compounds, they are all synthetic colored compounds. As a colorant for different purposes, it is often required to have high coloring strength, satisfactory vividness, and excellent durability (such as: heat resistance and acid/alkali stability, weather resistance color fastness, etc.).

There are many types of organic pigments, in order to facilitate application and understand their related chemical structures and properties, different classification of organic pigments methods can be used. It is usually classified according to different chromatography, molecular chemical structure and application performance.

1. Chromatographic classification of organic pigments

The natural organic pigments could be divided into yellow, orange spectrum; red, purple spectrum; blue, green, brown and black spectrum and so on.

2. Chemical structure classification of organic pigments

According to the color genes contained in the organic pigment molecules from pigment paste manufacturers, it is divided into six types of organic pigments: azo pigments, lake pigments, heterocyclic pigments, fused ring ketone pigments, phthalocyanine pigments, and other pigments.

3. Classification of organic pigment application performance and use

In the classification of use, it is divided into organic pigments for ink pigments, organic pigments for coatings, organic pigments for resin/plastics, organic pigments for rubber/latex, organic pigments for fabric printing and dyeing, and functional pigments, such as color filters for liquid crystal displays Use pigments, fluorescent pigments, electrostatic photocopying charges to produce pigments for layering, pigments for food and cosmetics, etc.

4. Application performance classification of organic pigments

In this classification, it is mainly divided into classic organic colour pigments and high-performance pigments.

Organic pigments are insoluble organic substances that are usually added to the substrate in a highly dispersed state to color the substrate. It is fundamentally different from dyes in that dyes are soluble in the dyeing medium used, whereas pigments are neither soluble in the medium in which they are used nor in the substrate being colored.

Many pigments and dyes have the same chemical structure, and they can be converted into each other by different methods of use. For example, some vat dyes and sulfur vat dyes can be used as fiber dyes if they are reduced to leuco; If not reduced, it can be used as a pigment for advanced ink.

Organic pigments are widely used in inks, paints, coatings, raw pulp coloring of synthetic fibers, pigment printing of fabrics, coloring of plastics, rubber, and leather, etc. Among them, the pigments of inks are used in the largest amount. The output of organic pigments accounts for about a quarter of the total output of dyes.

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