Fast Blue B2R

Fast Blue B2R


Textile Dyestuffs

C.I.Direct Blue 71

Molecular Structure: trisazo class

C.I.Direct Blue 71,C.I.34140,CAS 4399-55-7,1029.87,C40H23N7Na4O13S4,Direct Fast Blue 2RL,Direct Fast Blue B2R,Direct Fast Blue B2RL,Direct Navy BlueL-3RB,Sirius Blue S-BRR,Solophenyl Blue GL

Direct Fast Blue 2RL

Direct Fast Blue B2R

Direct Fast Blue B2RL

Direct Navy BlueL-3RB

Sirius Blue S-BRR

Solophenyl Blue GL

Molecular Formula:C40H23N7Na4O13S4

Molecular Weight: 1029.87

CAS Registry Number:4399-55-7

Manufacturing Methods : 3-Aminonaphthalene-1,5-disulfonic acid diazo, and Naphthalen-1-amine first coupling, its product to diazo, and 8-Aminonaphthalene-2-sulfonic acid second coupling, again diazo, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid third coupling.

Properties and Applications: dark blue. Blue gray powder. Soluble in water for blue, solubility of 10 g/L (60 ℃), 20 g/L (97 ℃), slightly soluble in soluble fiber element, soluble in ethanol, insoluble in other organic solvents. The strong sulfuric acid for blue to to blackred after diluted purple precipitation. Dye with strong hydrochloric acid solution for blue precipitation; Add thick sodium hydroxide solution for red light purple, have precipitation. Cellulose fiber of dyeing, dye devoured the gender is good, the temperature in the 80-100 ℃, affinity is the largest. Discharge sex is very good. In dye bath of copper ions in tiny change color (4 ~ 5 level), meet iron ion colored light basically unchanged (level 5). SDC classification for a class B. Cotton neutral white was a category 4, viscose neutral white for 4 ~ 5 level, cotton and viscose alkaline white are 5 levels. Widely used in viscose fiber dyeing, also used in viscose/PVA blends, cotton, and the carpet of dyeing and printing. Also used in leather, paper, soap, cheese, protein and formaldehyde resin color.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 4 4-5 5 2   2  
AATCC 2 4 4-5 1-2   2

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