Chrome tanning agent for blending and reducing animal and plant fiber and its prepn

Abstract

The chrome tanning agent for blending and reducing animal and plant fiber is prepared with bichromate 5-10 portions dissolved in water, water soaked waste cellulose 0.1-4 portions and waste leather 0.2-4 portions through mixing in a reactor with stirrer, reflux condensator and thermometer, adding slowly sulfuric acid 50-200 portions to react at 50-98 deg.c until six-valent chromium becomes three-valent chromium and blue solution of chrome tanning agent is obtained. The chrome tanning agent is used for tanning leather and is one kind of fibrous and protein filling chrome tanning agent. It has powerful reaction capacity with leather collagen, fast combination with leather, capability of producing full handle, soft, elastic and bright leather with high strength an high contraction temperature.

Description

1. Technical field [0001] The present invention relates to a kind of animal and plant fiber blending reducing chrome tanning agent and its preparation method, more specifically, the present invention relates to the reaction of blending reducing agent and oxidizing agent for the self-reduction of leather solid waste and cellulose organic waste to prepare chrome tanning agent. 2. Background technology [0002] At present, the preparation method of chrome tanning agent is to use external reducing agent to react with dichromate to prepare chrome tanning agent; , 1997; the inventor directly prepared chrome tanning agent from leather waste, China Leather 2001, 30 (15); the chrome tanning agent was prepared from cellulose-containing organic waste, and the inventor has applied for Chinese patent CN1298955A. The above preparation of chrome tanning agent with a single reducing agent, in the reduction reaction process, due to the different types of different reducing agents, the react...

AI Technical Summary

Problems solved by technology

The above preparation of chrome tanning agent with a single reducing agent, in the reduction reaction process, due to the different types of different reducing agents, the reaction process is quite different, the production is not easy to control, the amount of acid is large, and the amount of reducing agent is large; the reaction speed is slow, and the temperature needs to be increased. , High energy consumption; single performance of chromium liquid, too much masking effect

For this reason, someone in Leather Chemical Industry 2001, 18 (5) added glucose when leather shavings were reduced, so that the reaction speed was accelerated, and the performance of the chromium solution was improved. Large, basically filled with protein