The first step in pigment manufacturing is sourcing the raw materials. Depending on the desired color and application, pigments can be derived from natural sources, such as minerals, plants, and animals, or synthesized chemically.
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Pigment manufacturing process
Natural sources of paint lost their importance. Lead oxide pigment dispersed in oil was widely used as primer paint, due to its excellent anticorrosive feature. Since heavy metal lead is poisonous, this red paint is nowadays forbidden. Indigo was extracted from plants cultivated in Asia, nowadays the blue die for denim cloth coloration is synthesized almost exclusively by the chemical industry. The coloring materials were solved in organic solvents, benzene, toluene, xilols, turpentine, and nitro thinner. All these solvents pollute the environment, and some of them are carcinogens. Nowadays water-based products are common; however most part of paints are not water-soluble. In order to avoid segregation, stable dispersion should be formed where the pigments do not sediment.
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In order to eliminate solvents, powder coating is used for painting and decorating vehicles and other metal surfaces. Pigments are mixed with polymers, then extruded and milled. Classifier mills are preferable for a narrow particle size distribution
For more information, please visit iron oxide pigment for industry.
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