Diphenyl Red RW

Name	Direct Red 31
Synonyms	Direct pink Direct Red 31 Direct Pink 5B Diphenyl Red RW EINECS 225-669-8 C.I.Direct Red 31 C.I. Direct red 31 Nippon Fast Red 2B Benzo Rhoduline Red B C.I.Direct Red 31(29100) Chloramine Rose B,Pyrazol Pink 2B 2-Naphthalenesulfonic acid, 7,7'-iminobis(4-hydroxy-3-(2- Disodium 7,7'-iminobis(4-hydroxy-3-(phenylazo)naphthalene-2-sulphonate) 7,7'-iminobis[4-hydroxy-3-(phenylazo)-2-naphthalenesulfonic aci disodium sa 2-Naphthalenesulfonic acid, 7,7'-iminobis(4-hydroxy-3-(phenylazo)-, disodium salt disodium (3E,3'E)-7,7'-iminobis[4-oxo-3-(2-phenylhydrazinylidene)-3,4-dihydronaphthalene-2-sulfonate]
CAS	5001-72-9
EINECS	225-669-8
InChI	InChI=1/C32H23N5O8S2.2Na/c38-31-25-13-11-23(15-19(25)17-27(46(40,41)42)29(31)36-34-21-7-3-1-4-8-21)33-24-12-14-26-20(16-24)18-28(47(43,44)45)30(32(26)39)37-35-22-9-5-2-6-10-22;;/h1-18,33-35H,(H,40,41,42)(H,43,44,45);;/q;2*+1/p-2/b36-29-,37-30-;

Molecular Formula	C32H21N5Na2O8S2
Molar Mass	713.64738
Storage Condition	Room Temprature
Physical and Chemical Properties	Red-brown powder. Water solubility is good, the aqueous solution is blue-red, and the addition of concentrated hydrochloric acid produces jujube red precipitate, and the addition of concentrated alkali turns orange brown. Soluble in ethylene glycol ether, ethanol-soluble, Red Orange, insoluble in other organic solvents. In concentrated sulfuric acid orange to brown, diluted to produce dark blue-red precipitation; In concentrated nitric acid Brown solution, there is precipitation. Insoluble in concentrated alkali; Jujube red in concentrated ammonia.
Use	Mainly used for all kinds of cotton, hemp, silk textile dyeing

Raw Materials

EPA chemical information	Information provided by: ofmpub.epa.gov (external link)
use	direct pink is the main red dye variety, which is widely used in dyeing and printing of cotton and viscose fabrics, as well as silk and viscose fabrics. It has good dyeing and levelness, and high dyeing rate. It can also be used for direct printing of dyed silk, vinylon fabric and silk fabric. When used in cotton, viscose and other fiber blended fabrics, silk is slightly lighter in color, wool and nylon can be dyed, diacetate fiber is stained, and polyester and acrylic are slightly stained.
Production method	Using J acid (2-amino-5-naphthol-7-sulfonic acid) and aniline as raw materials, first two molecules of J acid Condensation to obtain double J acid, then diazotiate the aniline, and then couple with double J acid to obtain the product. The finished product is salted out, filtered, dried and crushed..

Last Update：2024-04-09 19:05:12

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Product Name: Direct Red 31 Visit Supplier Webpage Request for quotation
CAS: 5001-72-9
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409

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Diphenyl Red RW

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