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Talk about common varieties of organic pigments

1. azo pigments
Molecular structure of azo-containing (-N=N-) water soluble organic compounds in organic pigments is the largest variety and yield the maximum category. Azo pigments are made of aromatic amines or heterocyclic aromatic amines by diazotization of the diazo component and acetyl amine, 2-naphthol, pyrazoline ketone, 2-hydroxy-naphthalene carboxylic acid or 2-hydroxy-n-methyl naphthalene aromatic amine coupling component coupled to produce water insoluble precipitate, namely azo pigments.
2. the Lake
Water-soluble dyes (such as acid dyes, direct dyes, basic dyes) with the precipitate formed agents of water insoluble pigment. Its a brilliant blue shade, color spectrum than the whole, low production costs, higher than the original light fastness water soluble dyes.
3. the phthalocyanine pigments
They are water-insoluble organic matter, mainly blue and green pigments. The main industrial production is the phthalic anhydride urea (also available directly through o-dicyanobenzene) in the presence of ammonium molybdate catalyst, reacts with cuprous chloride, derived from crude known as "copper phthalocyanine". Pigment reprocessing methods, different products can be obtained. If crude will be dissolved in concentrated sulfuric acid, and then slowly in the water precipitate, α can be crystal, which is a blue with red organic pigment

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