Direct Yellow 28

Preparation

use sodium hypochlorite treatment 2-(4-Aminophenyl)-6-methylbenzo[d]thiazole-7-sulfonic acidsodium solution. A pure dye has strong green, and can be refined and sulfuric acid, such as Sirius Supra Yellow FRL (IG)

Properties and Applications

red light yellow. Yellow brown powder. Soluble in water, slightly soluble in ethanol lemon yellow. The strong sulfuric acid dyes for red light brown, diluted into yellow. The dye water solution is golden brown, add the strong hydrochloric acid sodium hydroxide solution or thick after the same color. All kinds of drug resistance, good resistance to chlorine stability, rongalite resistance and reduction of sodium sulfide. 60 ℃ in the solubility of 40 g/L, not sensitive to that fights. Dye bath of copper ions in colored light micro to turn green (4 ~ 5 level), iron ions in a red light (4 ~ 5 level), SDC classification for C, dye migration sex differences, to dead cotton covering power is poor. Cotton and glue the neutral and alkaline white are poor. Used for cotton, viscose of dyeing and printing, also used in cotton, viscose fiber blended fabric, wool, silk and polyamide fiber dyeing. Can also be used in leather, paper color. More used to spell dye.