A kind of preparation method of tala modified zirconium complex tanning agent and the tanning agent prepared thereof

Abstract

The invention relates to a preparation method of Tara modified zirconium complex tanning agent, which is prepared by mixing and reacting the following process steps and conditions: dissolving tannin extract in water to obtain Tara initial mixed liquor; mixing the mixed liquor in step 1 Centrifuge to keep the supernatant; purify the supernatant in step 2 by rotary steaming; transfer the solution in step 3 to the reaction kettle, add aqueous sodium hydroxide solution to adjust its pH to > 7, and add hydrogen peroxide solution after keeping the temperature for half an hour to make It is kept in an alkaline environment; continue to heat up the reaction under normal pressure, and then cool to normal temperature; adjust the pH value of the solution with dilute sulfuric acid, add a tetravalent zirconium salt solution, raise the temperature, and then cool and discharge to obtain the desired product. According to the technical scheme of the present invention, the obtained Tara modified zirconium complex tanning agent has good comprehensive performance and is environmentally friendly, and has the advantages of simultaneously retaining the tanning of zirconium metal tanning agent and the selective filling of tannin extract degradation products, so as to solve the problem of chrome tanning The effect of agents on the pollution of the environment.

Description

technical field [0001] The invention belongs to the technical field of leather tanning, and in particular relates to a preparation method of a Tara-modified zirconium complex tanning agent and the prepared tanning agent. Background technique [0002] Tanning is the key in the tanning process, which is a qualitative change process in which raw hides are treated with tanning agents to turn them into leather. Chrome tanning agent is currently the most widely used tanning agent, but there is a serious pollution problem in chrome tanning. According to statistics, the total chromium emission of the leather industry in 2014 was about 55.2 tons, ranking first among all industries, accounting for 41.9%. Chromium emission has become an important factor restricting the sustainable development of the leather industry. Therefore, research and design of chromium-free tanning agents to eliminate chromium pollution from the source is the fundamental way to solve the current problem of chro...

AI Technical Summary

Problems solved by technology

However, there are also many defects in practical application: the tannin extract has a lot of insoluble matter, the tannin content is not high, and the penetration is slow; the tannin extract has a certain color, resulting in a darker color of crust leather, and it is easy to produce discoloration with metal salts; The combination of vegetable tannin and leather is not strong, it is not washable, and the softness of the finished leather is poor

Among them, there is no relevant report on the preparation of organic zirconium complex tanning agents by using the degradation products of tara tannins and zirconium ions.