Active black dye composition

Abstract

The invention provides an active black dye composition for leather. The composition contains Deksol black B and Deksol orange R in a weight ratio of 50-90: 10-50, preferably 60-80: 10-40.

Description

technical field [0001] The invention belongs to the field of dye mixtures, in particular to a reactive black dye for leather. Background technique [0002] The dyeing of leather and related products is generally carried out with acid dyes, metal complex dyes or mordant dyes. Dyeing with acid dyes is only dyed by ionic bonds, the wet fastness is quite poor, and the blackness is poor; dyeing with metal complex dyes will cause great damage to the leather material, and the leather surface will be damaged after dyeing, and the molecular structure of the dye contains heavy metal ions ; And mordant dyes need to add hexavalent chromium ions in the dyeing process, which is very polluting to the environment, and the dyeing process is also more complicated, and the leather feel and brightness after dyeing are all relatively poor. The problems existing in these dyes for dyeing leather currently available on the market are that some have poor blackness and are not suitable for dyeing th...

AI Technical Summary

Problems solved by technology

Dyeing with acid dyes is only dyed by ionic bonds, the wet fastness is quite poor, and the blackness is poor; dyeing with metal complex dyes will cause great damage to the leather material, and the leather surface will be damaged after dyeing, and the molecular structure of the dye contains heavy metal ions ; while mordant dyes need to add hexavalent chromium ions in the dyeing process, which is very polluting to the environment, and the dyeing process is also relatively complicated, and the leather after dyeing has poor handle and brightness

The problems existing in these dyes for dyeing leather currently available on the market are that some have poor blackness and are not suitable for dyeing the leather surface, and some are not suitable for environmental protection due to the presence of heavy metal ions. Therefore, there is an urgent need for leather dyes with high blackness and good fastness performance that are environmentally friendly.

[0003] The invention provides a dye composition which not only meets the requirements of environmental protection, but also has high coloring rate, high blackness, excellent fastness performance, simple and easy dyeing process, and little damage to the leather of protein materials. Dyeing process, to overcome the problems of traditional acid dyes and metal complex dyes in dyeing protein materials such as poor blackness, poor wet fastness or heavy metals in the dye structure

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