Direct Dyes Direct Blue 2

C.I.Direct Blue 2,
C.I.22590,
CAS 2429-73-4,830.71,C32H21N6Na3O11S3,Direct Blue BH,Direct DiazoBlackBH
Molecular Formula:C32H21N6Na3O11S3
Molecular Weight:830.71
CAS Registry Number:2429-73-4
Manufacturing Methods :4-(4-Aminophenyl)benzenaminedouble nitriding, in alkaline conditions respectively with the4-Amino-5-hydroxynaphthalene-2,7-disulfonic acidand6-Amino-4-hydroxynaphthalene-2-sulfonic acidcoupling.
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, dilutedredfor purple; In nitric acid forbrownin 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: useNaphthalen-2-olshow color get navy, between 2 amine with benzene show color get black. Mainly used for cotton, viscose, silk, leather and pulp color.StandardAcid ResistanceAlkali ResistanceLight FastnessSoapingWaterFadingStainFadingStainISO44222AATCC33333
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