Zeolite Composition with Weak Acids for Chrome-Free Leather Tanning
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Solution Overview
Problem
Conventional tanning methods face challenges with environmental impact, human health concerns, and inefficiencies in leather production, particularly with zeolite compositions that require additional tanning agents like synthetic or metal salt tanning agents, leading to poor penetration, uneven leather quality, and high water usage.
Innovation Solution
A zeolite composition comprising one or more weak acids, which acts as a single tanning agent, providing effective penetration and uptake without the need for additional tanning agents, and can be implemented in a one-step process, tailoring leather properties such as shrinkage temperature and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tanning agents (synthetic, metal salt, or vegetable) are used, then leather production can proceed, but environmental harm, health risks, or poor leather quality result
Solution Approach 1:
The patent changes the chemical parameters of the tanning agent by using zeolite with specific SiO2/Al2O3 ratios (2-10) and combining it with weak organic acids (pKa 3-7) to achieve effective tanning without the harmful effects of conventional agents. This parameter optimization allows the tanning process to maintain effectiveness while eliminating chromium toxicity, aluminum sulfate's poor water resistance, and vegetable tanning's long processing time
Solution Approach 2:
The patent creates a composite tanning system by combining zeolite (aluminum silicate) with weak organic acids. This composite material leverages the ion exchange capacity of zeolite and the gentle chelating properties of weak acids to achieve superior tanning results without the harmful side effects of conventional single-component tanning agents
2Reliability
If zeolite is combined with additional tanning agents (synthetic or metal salt), then tanning can be achieved, but penetration and leather quality uniformity deteriorate
Solution Approach 1:
The patent optimizes the SiO2/Al2O3 ratio parameter of zeolite to 2-10, which controls the ion exchange capacity and pore structure. This parameter optimization enables uniform penetration into the leather without requiring additional tanning agents, thereby maintaining manufacturing precision and leather quality consistency
Solution Approach 2:
The zeolite-weak acid composite system is self-sufficient and does not require combination with other tanning agents. The weak organic acids enhance the zeolite's tanning capability through chelation, allowing the system to achieve complete and uniform penetration on its own, eliminating the quality issues associated with multi-agent combinations
3Productivity
If conventional tanning methods are used, then leather can be produced, but water usage increases
Solution Approach 1:
The patent changes the chemical composition parameters by using zeolite with optimized SiO2/Al2O3 ratios and weak organic acids, which have higher tanning efficiency per unit mass. This allows reduced water usage in the tanning bath while maintaining effective tanning, directly addressing the water consumption issue of conventional methods
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The zeolite composition with weak acids achieves efficient tanning with improved penetration, uptake, and solubilization, resulting in high-quality leather with consistent properties and reduced environmental impact, while eliminating the need for additional tanning agents and minimizing water usage.
Implementation Method 1
zeolite which is based on an aluminum silicate tanning agent
Implementation Method 2
zeolite composition suitable as single tanning agent comprising zeolite, a first weak acid, a second weak acid and optionally a third weak acid
Data Source
AI summary
The invention relates to tanning agents for leather and concerns a zeolite composition suitable as a single tanning agent comprising zeolite, a first weak acid, a second weak acid and optionally a third weak acid. This zeolite composition enables an efficient and effective chrome-free tanning.