Dyeing method and Tuscany leather preparation process using the same

Abstract

The invention discloses a dyeing method. The method comprises the following steps: (1) water returning, wherein water is added into a drum, the pH value is adjusted to be 6.5-7.0, fatty aldehyde is added, to-be-dyed original leather is put in after water and fatty aldehyde are uniformly mixed through rotation, rotation is conducted, the leather is placed over night, drainage is conducted, and thenthe leather is cleaned; (2) retanning; (3) hair opening, wherein water is added into the drum, the pH value is adjusted to be 7.5-8.0, a hair opening agent is added, and rotation, drainage and cleaning are conducted in sequence; (4) hair dyeing, wherein water of 45-50 EG C is added into the drum, a hair leveling agent and a hair side penetrant are added, rotation is conducted, an acid hair dye isadded, rotation is conducted, the pH value is adjusted to be 3.8-3.9, and sampling, color modulation, drainage and cleaning are performed in sequence. The invention further discloses a Tuscany leather preparation process using the method. The method can effectively solve the problems of dyeing processing difficulty and dyeing defects, caused by huge differences of hair properties, of the originalTuscany leather, hair fiber is not damaged during processing, the phenomena such as hair dryness and hair astringency are effectively avoided, and the finished product is attractive and has a good hand feeling and good wearing comfort.

Description

technical field [0001] The invention relates to the technical field of leather dyeing and preparation, in particular to a dyeing method and a preparation process of Tuscany leather using the method. Background technique [0002] Due to the huge difference in the nature of Tuscany's original fur, such as the coexistence of needle hair, coarse hair, semi coarse hair and fluff in the drum skin, it is difficult to dye and process, and the color difference between the finished fur surface is too large, and it is easy to appear color flowers The problem is that the finished product has poor aesthetics; on the other hand, the front-end water field process has a great impact, and different tanning methods will affect the dyeing quality of the rough surface and leather board in the later stage. When making the same order color, it is difficult to batch the embryos of different processes , which brings severe challenges to the dyeing technology, so the level dyeing of the hair surface...

AI Technical Summary

Problems solved by technology

[0002] Due to the huge difference in the nature of Tuscany's original fur, such as the coexistence of needle hair, coarse hair, semi coarse hair and fluff in the drum skin, it is difficult to dye and process, and the color difference between the finished fur surface is too large, and it is easy to appear color flowers The problem is that the finished product has poor aesthetics; on the other hand, the front-end water field process has a great impact, and different tanning methods will affect the dyeing quality of the rough surface and leather board in the later stage. When making the same order color, it is difficult to batch the embryos of different processes , which brings severe challenges to the dyeing technology, so the level dyeing of the hair surface in Tuscany has always been a difficult problem to be solved urgently

Secondly, due to the existence of guard hair, the traditional hair-opening and leveling dyeing process is likely to cause excessive damage to the wool fiber during processing, resulting in problems such as dryness and roughness of the hair, and the finished product is poor in wearing comfort.

The traditional wool dyeing method is high-temperature dyeing. Generally, the required temperature is 65 ° C ~ 75 ° C, because the hair scales can be opened better at high temperature, which is conducive to dye penetration and level dyeing, but this method consumes a lot of energy and production costs.

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