Direct Blue 121
Name:C.I.Direct Blue 121,C.I.34095
Molecular Structure: trisazo class
C.I.Direct Blue 121,C.I.34095,CAS 6661-87-6,877.77,C36H22N7Na3O10S3
Molecular Formula:C36H22N7Na3O10S3
Molecular Weight: 877.77
CAS Registry Number:6661-87-6
Manufacturing Methods : 2-(4-Aminophenylamino)-2-oxoacetic acid diazo, and 8-Aminonaphthalene-2-sulfonic acid coupling, again diazo, and 5-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, and 6-Hydroxynaphthalene-2-sulfonic acid coupling, and then 2-(4-Aminophenylamino)-2-oxoacetic acid hydrolysis base.
Properties and Applications: red light blue. Soluble in water for blue purple to navy, soluble in ethanol. The strong sulfuric acid for violet, diluted for purple, have red light blue precipitation. The dye solution to join strong hydrochloric acid have blue-ray black precipitation; Add thick sodium hydroxide solution have navy precipitation.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 5 | 5 | 4-5 | 4 | 4-5 | ||
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