Product Description
Direct Blue 71 (C40H23N7Na4O13S4), an azo dye with a high worldwide consumption.
Properties and Applications:
Dark blue. Blue gray powder. Soluble in water for blue, solubility of 10 g/L (60℃), 20 g/L (97℃), slightly soluble in soluble fiber element, soluble in ethanol, insoluble in other organic solvents. The strong sulfuric acid for blue to to black, red after diluted purple precipitation. Dye with strong hydrochloric acid solution for blue precipitation; Add thick sodium hydroxide solution for red light purple, have precipitation. Cellulose fiber of dyeing, dye devoured the gender is good, the temperature in the 80-100 ℃, affinity is the largest. Discharge sex is very good. In dye bath of copper ions in tiny change color (4 ~ 5 level), meet iron ion colored light basically unchanged (level 5). SDC classification for a class B. Cotton neutral white was a category 4, viscose neutral white for 4 ~ 5 level, cotton and viscose alkaline white are 5 levels.
Widely used in viscose fiber dyeing, also used in viscose/PVA blends, cotton, and the carpet of dyeing and printing. Also used in leather, paper, soap, cheese, protein and formaldehyde resin color.
Hot Tags: direct dye blue 71 direct fast blue b2rl, China, manufacturers, suppliers, factory, cheap, discount, quotation, low price, free sample, Direct Red Dye, Direct Grey Dye, Direct Blue Dye, Direct Green Dye, Direct Yellow Dye, Direct Black Dye
