Acid yellow 40

Uses

To dye wool. In the isoln of polymyxin.

Preparation

4-Aminophenoldiazo, and 5-Chloro-2-(3-methyl-5-oxo-2H-pyrazol-1(5H)-yl)benzenesulfonic acidcoupling, and then and 4-Methylbenzene-1-sulfonyl chloridereaction, make phenol hydroxyl esterification.

Definition

ChEBI: An organic sodium salt that is the monosodium salt of 5-chloro-2-[5-hydroxy-3-methyl-4-({4-[(4-methylbenzene-1-sulfonyl)oxy]phenyl}diazenyl)-1H-pyrazol-1-yl]benzene-1-sulfonic acid.

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 or no change. This product used for pure, thick wool clothing dyeing comb female, also used for silk, polyamide fiber dyeing, wool knitting products of silk nets printing. Can also be used in leather color.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	4-5	1	4	4-5	1	3	4-5	4
AATCC	5	2-3	2-3	4-5	2	2	3	3