Leather dyeing method

Abstract

The invention relates to a leather dyeing method, comprising the following steps: accurately weighing Deksol black B, Deksol orange R and Deksol yellow 3RS, fully pulverizing, mixing, and then evenly stirring to obtain the dyeing composition; weighing the dyeing composition, dissolving with water, and evenly shaking to obtain the dye solution; weighing leather, fully soaking with distilled water to be fully drenched; adding water and the leather into a dye jar, stirring for 5-10min, adding the dye solution, fully stirring, placing into a XW infrared-ray sample dyeing machine, adding ethylic acid and heating to 50-60 DEG C, wherein, the heating rate is 1-2 DEG C/min, keeping the temperature for 30-50min, adding formic acid to dye for 30-60min, cooling to 30-40 DEG C, taking out from the pot, washing with flowing water and baking or naturally drying at the temperature of below 50 DEG C.

Description

technical field [0001] The invention belongs to the field of leather dyeing, in particular to a leather dyeing method. 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 the leath...

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. and its dyeing method

[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