Direct Yellow 20

Preparation

4-(4-Aminophenyl)benzenamine double nitriding, and 2-Hydroxy-3-methylbenzoic acid (2 Moore) coupled.

Properties and Applications

yellow. Soluble in water for yellow, slightly soluble in benzene, carbon tetrachloride, soluble fiber element and ethanol. The strong sulfuric acid to red light purple, diluted purple for blue-ray, and then a green light yellow precipitation produce; In nitric acid partly dissolved for red light purple, and then into a brown. The dye solution to join strong hydrochloric acid for yellow brown, have precipitation; Add thick sodium hydroxide solution for red light yellow, precipitation. Used for cellulose fiber, silk, wool, polyamide fiber dyeing, leather color. Exhaust dyeing good, good levelness.