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• Time of issue:2020-07-20
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(Summary description)The main body in the molecule is phthalocyanine, and the structural formula is:


They are water-insoluble organic matter, mainly blue and green pigments. In 1934, the British Benemen Chemical Industry Company and the German Farben Company respectively produced the first variety-Phthalocyanine Blue. Most of the products contain divalent metals, such as copper, nickel, iron, manganese, etc. Some also replace the benzene ring in the molecule with a pyrrole ring or other rings, and introduce other groups into the molecule. Different structures have different Performance and use. The main variety of phthalocyanine pigments is copper-containing phthalocyanine blue (C.I. Pigment Blue 15). The main industrial production method is to react phthalic anhydride and urea (also directly using phthalonitrile) with cuprous chloride in the presence of an ammonium molybdate catalyst. The resulting crude product is commonly called "copper phthalocyanine". Different methods of post-treatment of pigments can get different commodities. If the crude product is dissolved in concentrated sulfuric acid and then slowly precipitated out in water, α crystal form can be obtained, which is a reddish blue organic pigment; if the crude product is dissolved in concentrated sulfuric acid, then a small amount Chlorine makes the molecule have 1 to 2 chlorine atoms, and the color of the product obtained is greener than that without chlorine; if the crude product and dry sodium chloride are ground in a ball mill, a stable green light β crystal product can be obtained . The crude product is heated to about 220°C in the melt of aluminum trichloride and sodium chloride, and chlorine gas is introduced to introduce 14-16 chlorine atoms into the molecule, and the product obtained is a bright green pigment; such as introducing a small amount of bromine , The resulting product has a more yellow and brighter shade.