Preparation method of tara modified zirconium complex tanning agent and tanning agent prepared by preparation method

Abstract

The invention relates to a preparation method of a tara modified zirconium complex tanning agent. The preparation method of the tara modified zirconium complex tanning agent comprises the following processing steps: one, a tanning extract is dissolved in water and tara initial mixed liquor is obtained; two, the tara initial mixed liquor obtained in the step one is centrifuged, and supernatant is obtained; three, the supernatant in the step two is subjected to rotary evaporation purification; four, a solution in the step three is transferred to a reaction kettle, a sodium hydroxide aqueous solution is added, a pH value of the solution is adjusted to be greater than 7, heat preservation is carried out for half an hour, then a hydrogen peroxide solution is added, and the solution is kept in an alkaline environment; five, under ordinary pressure, temperature reaction happens, then cooling to room temperature is carried out; and six, a pH value of the solution is adjusted with dilute sulphuric acid, a tetravalent zirconium salt aqueous solution is added, heating-up is carried out, then cooling and discharge are carried out, and a required product is obtained. With the adoption of the technical scheme, the prepared tara modified zirconium complex tanning agent is good in comprehensive performance, is environmental-friendly, and has the advantages of retaining the tanning property of a zirconium metal tanning agent and the selective filling property of a tanning extract degraded product simultaneously, and the like, so that the problem that a chromium type tanning agent has pollution to the environment is solved.

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.