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Molecular formula : C16H6Br4N2Na2O8S2
MW : 783.948
CAS : No
nature : light green gray powder. Dissolved in water (90 ° C) and 20 g / L, respectively. Water soluble blue, and was under fluorescent-purple. The concentrated sulfuric acid was blue and green. Hu aqueous solution of phenolphthalein was alkaline. More sensitive to light, easy color so prematurely stained. Resistance strong oxidants. Staining oxide difficult, low hair color is not sufficient. With its mother for bromine indigo dye.
Preparation : bromine original indigo dye used pyridine, chlorosulfonic acid and iron for esterification, in alkaline solution hydrolysis, steamed pyridine, after filtering into the filtrate added salt salting out, and then filtering, namely, the original dye cake. Raw material consumption (kg / t) bromine Indigo 530 chlorosulfonic acid (95%) 405 iron 130 pyridine 415 urea Soda 830 30 80 pure benzene 4
uses castor oil : mainly for cotton fiber and textile-dyeing and printing. Also for silk and wool dyeing. The goods often with the reduction Green IB. Reduction golden IGB fight with the blue and dark green. Also pigment or faster Yellow 6011 fight with the dark green paste printing. Due to a high rate of dyeing without steaming, save energy and reduce costs. The goods with pollutants by cyanide - formaldehyde resin or DMEU housekeeping, both Shade almost unchanged.
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