3-Amino-4-hydroxybenzenesulfonamide diazo, and N-(2-chlorophenyl)-3-oxobutanamide?coupling, and then use cobalt chloride complexation and filtering.
Properties and Applications
red light yellow. Yellow brown evenly powder. Because the dye molecules is bigger, its water solution to gel state, when the temperature drops, in solution will appear flash the crystallization of the particles. The strong sulfuric acid for yellow, diluted into light yellow; In strong hydrochloric acid in the same color, diluted solution for light yellow; In nitric acid was damaged in, remain a small amount of yellow; In a dilute nitric acid solution for tender yellow; In sodium hydroxide solution for yellow, yellow for solution diluted. Water solution is yellow. Used for tops, nylon strip, silk, polyvinyl alcohol, silk, polyvinyl alcohol / cotton blends, wool / rayon blended fabric dyeing. Now mainly used with Villeneuve and nylon fabric, but also for wool, silk, nylon and leather dyeing direct printing..
