Molecular formula : C37H28N6Na4O17S4
MW : 1048.89
CAS : No
nature :-brown powder, dissolved in the water was red and blue to red, micro-soluble fibrinolytic, do not dissolve in organic solvents. The concentrated sulfuric acid was blue, purple was diluted, in leisurely nitric acid solution by the blue-black to blue, then to olive. Its solution increases are concentrated hydrochloric acid precipitation blue and green; Concentrated liquid caustic soda was yellow orange. Hard water is very sensitive right. Case of copper, iron and shade changed slightly.
Preparation Methods : H diazotization acid, and Kelixiding for coupling, and then with phosgene condensation, and then salting out, filtration and drying and prepared.
purposes : mainly for cotton and viscose fiber and fabric dyeing and printing. To improve the wet fastness can be fixing agent Y treatment or use of urea - formaldehyde resin, it should be noted that solid reagent handling Y will be reduced sunlight fastness. Also for silk, wool, Kam / viscose, polyester / rayon blended fabric dyeing. Also for the leather, paper and coloring of Split. The goods and performance of the shade and direct light red 4B very similar to the other alternative, and its sun-4B fastness than good.
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