Pigment is a colored fine particle powder substance, generally insoluble in water, oil, solvent and resin, etc., and can be dispersed in various media. Pigments play a role in coloring, anti-rust, covering and so on in paint. Filler is also a kind of pigment, and it can also be called extender pigment. It has no coloring effect on the coating film and has a small covering effect, but it can increase the thickness and volume of the coating film. Some fillers have special functions such as anti-settling and improving mechanical properties.
Pigments can be divided into inorganic pigments and organic pigments according to their chemical structure, and can be divided into coloring pigments, antirust pigments and extender pigments according to their properties, and can be divided into natural and artificial according to their sources. Natural pigments are mostly derived from natural minerals, such as cinnabar, stone green and so on. Artificial pigments are mostly inorganic or organic compounds, such as iron red, Ming yellow, toluidine red, etc. Organic pigments have various colors and bright colors, but they are not as good as inorganic pigments in many properties. For example, inorganic pigments are relatively stable to the action of light and the influence of the atmosphere, and can form a coating film that protects metal from corrosion.
