CN1861692A - Direct dark brown NM dye and its preparation - Google Patents

Abstract

This invention relates to a type of tan-brown NM dyestuff and the method. The constitutional formula is as above. The method as follow: first condense 4.4-diaminobenzidine with ortho-oxybenzoic acid in condition of 15-17deg.C, PH=8.2 to condensation production of golden yellow dyestuff, then condense it with gammaacid to come to the product. no coupling in the method so prevent producing carcinogen. It is a good substitution to traditional ozoic dyestuff.

Description

A kind of direct dark brown NM dye and preparation thereof

Technical field

The present invention relates to a kind of direct dark brown NM dye and preparation thereof.

Background technology

The direct dark brown M of the fifties invention in last century.Structural formula is:

This product is a kind of azoic dyestuff, has the harm of system cancer, feasible production and applying unit employee's healthy very big influence, the kind that existing pass department explicit order stops to produce of being subjected to.Especially the cloth that exports the Western European countries is banned use of and contain azo.

Summary of the invention

For addressing the above problem, the invention provides a kind of dark brown dye well its preparation method that does not have the azo performance.

In order to achieve the above object, a kind of direct dark brown NM dye of the present invention, the compound of its structural formula is:

(1)R＝H、SO ₃H

(2)M＝Na、K

The preparation method of dyestuff of the present invention, be by the amino anilide of 4.4-two ' and salicylic acid at 15-17 ℃, condensation makes and is flavous dyestuff under the condition of PH=8.2, is with above-mentioned that flavous dyestuff and γ acid are synthetic to make required dyestuff.

A kind of direct dark brown NM dye of the present invention, its preparation process does not have the coupling process, has prevented to produce and carry secretly because of coupling the generation of carcinostatic substance phenomenon.Dyeing firmly improves the 1-2 level during use, is the optimal substitute of traditional product.

Embodiment

Embodiment one, take by weighing the amino anilides of 11.52 grams and 8.3 gram salicylic acid at 15-17 ℃, condensation makes and is flavous dyestuff under the condition of PH=8.2, will be above-mentioned be sour synthesizing of flavous dyestuff and γ to make required dyestuff.

Claims (2)

1, a kind of direct dark brown NM dye, the compound of its structural formula is;

2, according to the described dyestuff of claim 1, at 15-17 ℃, condensation makes and is flavous dyestuff its preparation method under the condition of PH=8.2 by 4.4-two ' the amino anilide and salicylic acid, is with above-mentioned that flavous dyestuff and γ acid are synthetic to make required dyestuff.