Wet state dyeing and finishing one-bath technology for cattle instep leather

Abstract

The invention relates to the technical field of tanning chemical and engineering, and provides a wet state dyeing and finishing one-bath technology for cattle instep leather. In the wet state dyeing and finishing process, the procedures of chromium retanning, neutralizing, filling retanning, dyeing, stuffing and the like are conducted in a one-bath manner, different materials act in a one-bath manner and can mutually promote seepage and diffusion, the technology process is simple, and operation is convenient and easy to achieve. Crust leather manufactured through the wet state dyeing and finishing one-bath technology for the cattle instep leather is soft and full in body and rich in elasticity, a grain surface is smooth, delicate, compact and free of a loose side, and various physical and chemical properties meet the industry requirement. Meanwhile, the wet state dyeing and finishing one-bath technology for the cattle instep leather has obvious energy saving and emission reducing benefits, waste water pollution can be greatly relieved, and the material usage amount and the water usage amount are reduced. The production time is shortened, the production cost is reduced, the production efficiency is improved, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to a wet-state dyeing and finishing one-bath process for yellow cattle upper leather. Background technique [0002] The traditional tanning production process is complex and cumbersome. It often takes dozens to hundreds of processes from a raw hide to a finished leather. This is a time-consuming and high-consumption process, and a large biochemical, inorganic and organic materials, which have adverse effects on the environment. In order to reduce or eliminate these adverse effects and maintain the healthy and stable development of the tanning industry, the state and society have proposed the development direction of energy saving, emission reduction and clean tanning. Tannery workers have done in-depth research on the improvement and innovation of tannery technology and achieved great results. As one of the main directions of tannery technology improvement...

AI Technical Summary

Problems solved by technology

In the traditional tanning process, almost every process in the wet dyeing and finishing process is carried out separately, and the washing operation is required after completion. Not only is the process cumbersome and time-consuming, but also the consumption of chemical materials and water is relatively large.

The absorption of retanning agent by leather will reach a balance under certain conditions, and the absorption rate is generally only 60%-80%, and the remaining 20-40% of the chemical material remains in the waste liquid and is discharged, which is not only a great waste of resources, but also also caused serious pollution to the environment

Since the traditional wet dyeing and finishing process requires multi-step washing, its consumption of water cannot be ignored. According to statistics, the amount of water consumed in the wet dyeing and finishing process accounts for about 40%-45% of the entire tanning process, which is a great waste. water resources