Acid Yellow 4R

Preparation

3-Amino-4-hydroxybenzenesulfonamide diazo, and 3-Oxo-N-phenylbutanamide coupling, and then into a 2-1 cobalt complex. Structure and the C.I.Acid Yellow 128 ?the same.

Properties and Applications

brilliant yellow.brown uniform powder, soluble in water, solubility of 50 g/L (80 ℃). The strong sulfuric acid for yellow, diluted light yellow solution; In the thick of sodium hydroxide solution for yellow, diluted light yellow. Its water solution for light yellow. Can be used for wool, silk, nylon, polyvinyl alcohol and dimension/cotton, wool/viscose blended dyed in the wool, silk and nylon fabric printing directly, can also be used for leather coloring.