1,-Naphthalenedisulfonic acid, 4,4'-[carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bis-, tetrasodium salt

Preparation

4-Aminonaphthalene-1,6-disulfonic acid?or 4-Aminonaphthalene-1,7-disulfonic acid?diazo, and 2-Amino-4-methylanisole coupling, and then make the light gasification.

Properties and Applications

orange. Soluble in water for orange, slightly soluble in alcohol. The strong sulfuric acid for blue, green light blue after diluted precipitation. The dye solution to join strong hydrochloric acid have hidden cyan precipitation; Add thick sodium hydroxide solution have orange precipitation. Used for cellulose fiber dyeing and printing, and can be used in the paper color. 80 ℃ with the biggest dyeing affinity, good levelness.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	4-5	4	4-5	2-3		2-3