Direct Green 33
Name:C.I.Direct Green 33,C.I.34270
Molecular Structure: trisazo class
C.I.Direct Green 33,C.I.34270,CAS 6428-18-8,1039.96,C42H31N7Na4O15S4
Molecular Formula:C42H31N7Na4O15S4
Molecular Weight: 1039.96
CAS Registry Number:6428-18-8
Manufacturing Methods : Naphthalen-2-ol amine 8 diazo, and 3,5-Dimethylbenzenamine coupling, again diazo, and 5-Amino-7-ehtoxy-2-naphthalenesulfonic acid coupling, its product to diazo, and 4-Acetamido-5-hydroxynaphthalene-2,7-disulfonic acid coupling (finally coupling is with the sodium bicarbonate water cut in Pyridine in).
Properties and Applications: green. Soluble in water for the green, soluble in ethanol. For the strong sulfuric acid, diluted is green. The dye solution to join strong hydrochloric acid have pale-green precipitation; Add thick sodium hydroxide solution for the green.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 3-4 | 3-4 | 5 | 2-3 | 3 | ||
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