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
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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