Direct Dyes Direct Blue 2

C.I.Direct Blue 2,
C.I.22590,
CAS 2429-73-4,830.71,C32H21N6Na3O11S3,Direct Blue BH,Direct Diazo BlackBH

Molecular Formula:C₃₂H₂₁N₆Na₃O₁₁S₃

Molecular Weight: 830.71

CAS Registry Number:2429-73-4

Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, in alkaline conditions respectively with the 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.

Properties and Applications: dark blue. Blue gray powder. Soluble in water for deep purple to black, solubility 35 g/L (85 ºC), slightly soluble in ethanol and soluble fiber element. The strong sulfuric acid in blue, diluted red for purple; In nitric acid for brown in the light purple. The dye solution to join strong hydrochloric acid for red light purple; Add thick sodium hydroxide solution for purplish red color. For cellulose fiber dyeing, the dye absorption rate as well, in 60 ~ 80 ºC temperature when the biggest affinity. Discharge good, after staining with chromogenic diazotization colorimetric method: use Naphthalen-2-ol show color get navy, between 2 amine with benzene show color get black. Mainly used for cotton, viscose, silk, leather and pulp color.

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