Direct dark brown NM dye and its preparation

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

technical field [0001] The invention relates to a direct dark brown NM dye and its preparation. Background technique [0002] The direct dark brown M invented in the 1950s. The structural formula is: [0003] [0004] This product is a kind of azo dye, which has the hazard of carcinogenesis, which greatly affects the health of the employees of the production and use units. Now the relevant departments have ordered to stop the production of the species. In particular, the use of azo-containing substances is prohibited for fabrics exported to Western European countries. Contents of the invention [0005] In order to solve the above problems, the present invention provides a dark brown dye without azo properties and a preparation method thereof. [0006] 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: [0007] [0008] (1) R=H, SO 3 h [0009] (2) M=Na, K [0010] The pr...

AI Technical Summary

Problems solved by technology

[0004] This product is a kind of azo dye, which has the hazard of carcinogenesis, which greatly affects the health of the empl

Images