- Pigmentation process for paratonere 3BL
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The invention discloses a pigmentation process for paratonere 3BL. The process comprises the following steps: subjecting a crude 3BL product to dry ball milling in the presence of a grinding aid, an organic solvent and a dispersant for 4 to 5 h; after completion of ball milling, pouring a material obtained after ball milling into an aqueous medium containing a nonionic surfactant; maintaining a temperature of 70 to 80 DEG C for 1 to 2 h; and carrying out filtering washing and drying so as to obtain a finished 3BL product; wherein the addition amount of the grinding aid is 3 to 7 times the weight of the crude 3BL product, the addition amount of the organic solvent is 5 to 10% of the weight of the crude 3BL product, and the addition amount of the dispersant is 1 to 3% of the weight of the crude 3BL product. The pigmentation process for paratonere 3BL is simple in process steps and mild in reaction conditions, and uses easily available raw materials; and the prepared finished 3BL product has high strength, good dispersity, good glossiness and good stability. The finished 3BL product is applicable to blending of a variety of industrial paints and has brilliant colored light and good fluidity.
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Paragraph 0016
(2017/01/02)
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- ELECTROCHEMICAL REDUCTION OF SODIUM 1-AMINO-4-BROMO-ANTHRAQUINONE-2-SULFONATE
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The product from electrochemical reduction of sodium 1-amino-4-bromoanthraquinone-2-sulfonate in an alkaline medium is sodium 1-aminoanthraquinone-2-sulfonate.In the presence of copper sulfate disodium 4,4'-diamino-1,1'-bianthraquinonyl-3,3'-disulfonate is also formed.In the presence of copper sulfate and oxygen sodium 1-amino-4-hydroxyanthraquinone-2-sulfonate is also formed.It is suggested that during the electrochemical reduction, as in the reduction of 1-amino-4-bromoanthraquinone-2-sulfonic acid with aromatic amines, these products are formed by a mechanism involving an electron transfer stage.
- Vinokurov, Yu. V.,Ryabinin, V. A.,Solodova, K. V.,Shein, S. M.
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p. 382 - 385
(2007/10/02)
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