Acid Yellow 40:1

Preparation

4-Aminophenol diazo, and 2-(4-Aminophenyl)-6-methylbenzo[d]thiazole-7-sulfonic acid?coupling, and then and 4-Methylbenzene-1-sulfonyl chloride?reaction, make phenol hydroxyl esterification.

Properties and Applications

yellow. Pale yellow powder. Soluble in water, but soluble in ethylene glycol ether, slightly soluble in ethanol and acetone, insoluble in other organic solvents. The strong sulfuric acid dyes in yellow; In nitric acid in yellow. Its water solution yellow, add hydrochloric acid sodium hydroxide solution or no change. Mainly used for wool, silk and polyamide fiber dyeing, also used in medicine, cosmetics and leather dyeing.