C.I. Direct Black 20, disodium salt

C.I. Direct Black 20, disodium salt structure

CAS No.: 7237-47-0

Chemical Name:: C.I. Direct Black 20, disodium salt

Synonyms: Direct Black 20;C.I.Direct Black 20:C.I.30395;C.I. Direct Black 20, disodium salt

CBNumber:: CB94779570

Molecular Formula:: C38H35N10NaO10S2

Molecular Weight:: 878.87

MDL Number:

MOL File:: 7237-47-0.mol

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C.I. Direct Black 20, disodium salt Chemical Properties,Uses,Production

Preparation

3,3′-Dimethoxylbenzidine double nitriding, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid, and then three with Benzene-1,3-diamine coupling, N-(4-aminophenyl)acetamide diazo, and formation of accidentally coupled nitrogen compounds.

Properties and Applications

blue and black. Moderate soluble in water (for violet black) and ethanol (for dark purple). The strong sulfuric acid for Gray light black, diluted for dark purple. The dye solution to join strong hydrochloric acid have dark purple precipitation; Add thick sodium hydroxide solution have sauce red precipitate.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	3	5	3	1-2		2

C.I. Direct Black 20, disodium salt Preparation Products And Raw materials

Raw materials

o-Dianisidine 8-Amino-1-naphthol-3,6-disulfonic acid monosodium salt monohydrate m-Phenylenediamine 4'-Aminoacetanilide

Preparation Products

7237-47-0(C.I. Direct Black 20, disodium salt)Related Search:

Direct Black 201 2-Naphthalenesulfonic acid, 6-[[2-amino-4-[(2-hydroxyethyl)amino]phenyl]azo]-3-[[4-[[4-amino-6(or 7)-sulfo-1-naphthalenyl]azo]phenyl]azo]-4-hydroxy-, disodium salt Direct Black 196 Direct Black 199 Direct Black 198

Direct Black 202 Glycine, N-[5-amino-4-[[7-[[4-[(4-amino-6-sulfo-1-naphthalenyl)azo]phenyl]azo]-8-hydroxy-6-sulfo-2-naphthalenyl]azo]-2-methylphenyl]-, trisodium salt DIRECT BLACK 22 Direct Black 197

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C.I. Direct Black 20, disodium salt Direct Black 20 C.I.Direct Black 20:C.I.30395 7237-47-0