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Product Name:Direct Black 22 100%
Molecular Structure: Multi-azo class 
Molecular Formula:C44H32N13Na3O11S3
Molecular Weight: 1083.97
CAS Registry Number:6473-13-8
Manufacturing Methods : 5-Amino-2-(4-aminophenylamino)benzenesulfonic acid double nitriding, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid (2 Moore) coupled, then double nitriding, and Benzene-1,3-diamine (2 Moore) coupled.
Properties and Applications: green and black. Blue gray powder. Soluble in water for violet black. The strong sulfuric acid for violet black, dilute black light after brown precipitation; In nitric acid solution for the red light brown in, precipitation. The dye solution to join strong hydrochloric acid have brown light black precipitation; Add thick sodium hydroxide solution for dark blue light red. Mainly used for cotton, viscose, wool/stick,nylon/rayon blended fabric dyeing and printing, also used in leather and paper dyeing.
Counter product:Benzonerol VSF;Benzanil Black 2GC 600%;Black VSF 600
Use: for cotton, viscose, wool/stick,nylon/rayon blended fabric dyeing and printing, also used in leather and paper dyeing.
Packing: 25KG Carton
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
Fading | Stain | Fading | Stain | ||||
ISO | 5 | 4 | 4 | 3 | 3 | ||
AATCC | 5 | 4-5 | 5-6 | 3 | 3 | ||
