Method for tanning high-temperature stable chromium-free costume soft leather

Abstract

The thermal-stable production method for Cr-free vehicle seat cushion comprises: bating the pig, cattle and sheep shin with modified plant agent, non-Cr sulphate agent and synthetic azophosphon agent; then, currying with high-sulfonated animal / plant oil. The product has shrinkage temperature up to 110Deg, shows well hand feeling and resistance to thermal and age. This invention reduces cost and sewage discharge, improves absorption rate, and exploits a new way for Cr-free leather.

Description

technical field [0001] The invention relates to a tanning method of chrome-free garment soft leather with high thermal stability, belonging to the field of leather tanning. It is suitable for the requirements of pigskin, cowhide and sheepskin garment leather which are currently demanded in the market. The shrinkage temperature and physical and mechanical indicators of the finished leather have reached the chrome-tanned leather standard issued by the Ministry of Industry in 1999. Background technique [0002] Currently worldwide, due to the harmfulness of chromium to humans and the environment, especially the hexavalent chromium converted from trivalent chromium is carcinogenic to humans, and at the same time causes waste of resources and pollution of the environment. Therefore, chromium-free manufacturing is required for medium and high-grade automotive leather. But so far, there is no chrome-free clothing soft leather produced by a complete chrome-free tanning method that...

AI Technical Summary

Problems solved by technology

The two have a synergistic effect, and the shrinkage temperature of the leather after tanning can reach 100°C (He Xianqi, Wang Yuanliang. Research on the mechanism of vegetable-aluminum combined tanning. China Leather, 25(6): 15-18.), but in industrial production There are two problems in the production process. One is that the reaction speed of vegetable tanning agent and aluminum salt tanning agent is extremely fast, and it is impossible to complete uniform and combined tanning according to the theoretical ratio under the one-time feeding and limited drum speed in production, and it is even more difficult to obtain The industrial production of leather with uniform quality is manifested in the uneven color tone of the leather, and the difference in shrinkage temperature between sheets and different parts of a sheet; the current solution is the saturated tanning method, that is, the use of the largest amount of tanning agent. Raw hides are saturated and absorbed, and the result is that the leather body of the finished leather is very hard, and the quality of the manufactured soft leather leather is limited; the second is that the selection of the fatliquoring agent for the tanned crust leather in the later stage is very complicated and key, and the current leather chemical materials are all For chrome tanned leather, especially fatliquor

The usual chrome-free tanned leather is relatively mature for the absorption and combination of anionic materials, but it is difficult to ideally penetrate the anionic materials due to the anionic properties of chrome-free tanning, otherwise the strong competitive combination will destroy the tanning properties of the tanning agent, and eventually lead to The shrinkage temperature is lowered above 20°C, so that the shrinkage temperature is lower than 90°C, and the heat setting processing of soft garment leather in the subsequent product processing will bring difficulties