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Ⅰ. What are coating pigments?
Coating pigment is a kind of fine powder colored substance, which is insoluble in water or oil medium, but can be uniformly dispersed in the medium, and is applied to the surface of the object to form a color layer to present a certain color. Pigment is an essential raw material in the coating process, it can make the coating have a certain covering ability, increase the color and protect the object. Colored pigments in the coating can also enhance the strength of the coating film, prevent the penetration of ultraviolet rays, and enhance the durability, weather resistance, and abrasion resistance of the coating film.

Pigments can be divided into two basic types, color pigments and system pigments (fillers). The most basic requirement for colored pigments is to impart color and opacity to the coating film, and can also have some other functions, such as anticorrosion, temperature indication, and luminescence. Colored pigments can be further classified into inorganic pigments and organic pigments. The properties of these two types of pigments are very different, and both inorganic and organic pigments are widely used in the coatings industry.

Pigment is also an essential component in the coating system, and the pigment is a secondary film-forming substance in the coating. The so-called pigment is a colored mineral or organic substance that is insoluble in binders (various film-forming substances).

Ⅱ. Classification of coating organic insoluble pigment
1. From the use of pigments, it is divided into three types: extender pigments, coloring pigments, and anti-rust pigments.
(1) Extender pigment: mainly used to increase the thickness of the coating, improve the wear resistance and mechanical strength.
(2) Coloring pigments: It has good covering properties and can improve the sun protection, durability and weather resistance of the coating. Some pigments can improve the abrasion resistance of the coating. And most importantly, color pigments can impart a variety of colors to the coating.
(3) Anti-rust pigment: This pigment can make the coating have good anti-rust ability and prolong life. It is the main raw material of anti-rust primer.

2. From the source of coating organic colour pigments, it can be divided into organic pigments and mineral pigments. Mineral pigments can be divided into natural pigments and artificial pigments.
(1) Mineral pigments: Mineral pigments are metal oxides or salts with complex structures. It is relatively stable to the effect of light and the atmosphere, and may form a film that protects the metal surface from corrosion. The most valuable mineral pigments are artificial pigments, which can be produced in a fixed color and shade on demand.
(2) Organic pigments: have rich colors and bright shades, but are inferior to mineral pigments in many properties. It still has value for use in less demanding finishing applications.

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