Complexing agent for chrome-free tanning of leather and preparation method of complexing agent
By preparing a complexing agent, the problems of low precipitation points and environmental pollution of zirconium tanning and titanium tanning agents in leather tanning are solved, and high-performance chrome-free tanning is achieved, which improves leather performance and reduces environmental impact.
Patent Information
- Application Number
- CN202310581995.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-19
- Publication Date
- 2025-07-22
AI Technical Summary
The existing zirconium tanning and titanium tanning agents have problems such as low precipitation points, strong hydrolysis, strict tanning environment requirements, and uneven tanning effects in leather tanning, resulting in a gap between leather performance and chrome tanning agents, and the tanning process is polluted to the environment.
A complexing agent is prepared by reactions such as glycol polyols, unsaturated conjugated anhydrides, catalysts and anhydrous sodium sulfite through a specific temperature and time to improve the precipitation point and alkali resistance of zirconium tanning and titanium tanning agents and improve leather performance.
The prepared complexing agent can significantly improve the precipitation point of zirconium tanning and titanium tanning agent, improve the performance of the leather, make the leather shrinkage temperature reach above 85℃, reduce environmental pollution, and be easy to obtain.