ACID BLACK 234

Acid Black 234 is a dye with good exhaustion, but has the build-up and level dyeing performance. The product is compatible with other blacks on different tanning systems.

CI No 30027
CI Name Acid Black 234
CAS No 157577-99-6
Purity 170% – 200% "Salt Free / RO"
End Use Leather
Wool
Polyamide Fiber
Silk
Molecular Weight 860.81
Synonyms Acid Black NB, Acid Black NB-G, Leather Black NGRL, Acid black 2BNG
Product Group Non Metal Complex Dyes
C.I.Acid Black 234,C.I.30027,CAS 157577-99-6,860.81,C34H26N10Na2O9S3,Weak Acid Black N-BG,Weak Acid Black NB-G,Acid Black 2BNG,Acid Black N-BG,Acid Black NE

Molecular Formula:C34H26N10Na2O9S3

Molecular Weight: 860.81

CAS Registry Number:157577-99-6

Manufacturing Methods : 4-Amino-N-(4-aminophenyl)benzenesulfonamide double nitriding,sulfonylurea aniline in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acidcoupling, aniline diazo, and the above the products in alkaline conditions coupling, and then Benzene-1,3-diamine coupled.

Properties and Applications: black. Mainly used for wool, silk, cotton and glue dyeing, also can be used for leather dyeing.