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Direct Blue 81

Name:C.I.Direct Blue 81,C.I.34215

Molecular Structure: trisazo class

C.I.Direct Blue 81,C.I.34215,CAS 6252-57-9,1121.97,C46H27N7Na4O14S4

C.I.Direct Blue 81,C.I.34215,CAS 6252-57-9,1121.97,C46H27N7Na4O14S4

Molecular Formula:C46H27N7Na4O14S4

Molecular Weight: 1121.97

CAS Registry Number:6252-57-9

Manufacturing Methods :  4-Amino-5-(phenylsulfonyloxy)naphthalene-2,7-disulfonic acid diazo, and Naphthalen-1-amine coupling, its product to diazo, and 8-Aminonaphthalene-2-sulfonic acid coupling, again diazo, in alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling, and then hydrolysis benzene acyl sulfonylurea medications.

Properties and Applications: blue. Soluble in water for blue, not soluble in ethanol and other organic solvents. The strong sulfuric acid for blue-ray black, diluted to blue. The dye solution to join strong hydrochloric acid have precipitation of dark; Add thick sodium hydroxide solution have blue precipitation.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 4 4 6 3 3-4
AATCC 3 4 5 4 4

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