Nano-micelle tanning agent, preparation method of nano-micelle tanning agent, and application of nano-micelle tanning agent in tanning leather

Abstract

The invention provides a nano-micelle tanning agent, a preparation method of the nano-micelle tanning agent, and application of the nano-micelle tanning agent in tanning leather. The nano-micelle tanning agent is of a core-shell nano-micelle structure which is formed in water through self-assembling with the adoption of methoxypolyethylene glycol polyacrylate-multicomponent acrylic copolymer and common inorganic metal ions in the tanning leather and uses the copolymer as a shell and the metal ions as a core. By means of the core-shell structure, trivalent chromium can be effectively protectedand prevented from being converted into hexavalent chromium; the nano-micelle tanning agent can be applied to tanning without pickling, salt-less pickling tanning and traditional pickling tanning andcan break the limit of the chemical equilibrium during tanning combination, the metal ions can be subjected to coordination complexation together with a skin collagen carboxyl group and a polymer carboxyl group, uniform tanning is achieved, meanwhile the absorbing utilization ratio of the metal ions is increased, and heavy metal discharging pollution and neural salt pollution are reduced. Furthermore, the fullness and physical and mechanical properties of finished leather can be improved, and the retanning effect is achieved, and the main tanning and retanning integration of the tanning leather process is achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of leather tanning agent and its tanning application technology, and in particular relates to a metal ion-loaded nano-micelle tanning agent and its preparation method, and its application in cleaning tanning and traditional tanning. Background technique [0002] In the traditional leather industry, commonly used metal tanning agents include chrome tanning agents, aluminum tanning agents, zirconium tanning agents, and iron tanning agents. The tanning mechanism of these metal tanning agents is that their metal ions form a cross-linked tanning effect through coordination and complexation with carboxyl groups on leather collagen fibers. Especially chrome tanning agent is currently recognized as the tanning agent with the best comprehensive performance, and chrome tanned leather also accounts for more than 85% of all leather products because of its high moisture and heat resistance stability and wi...

AI Technical Summary

Problems solved by technology

If the metal tanning agent is directly used for tanning without pickling, it is very easy to cause the surface of the leather to be over-tanned, which will seriously affect the quality of the finished leather

However, in the pickling process, in order to prevent skin acid swelling, 8% NaCl needs to be added, resulting in a large amount of neutral salt in the tanning waste liquid, which has become another important source of pollution in the traditional tanning process

[0004] In summary, chrome pollution and neutral salt pollution in the traditional chrome tanning process have seriously restricted the sustainable development of the leather industry

Images