Plant Biomass Active Tanning Agent for Chrome-Free Leather Stability
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Solution Overview
Problem
Existing chrome-tanned leathers face environmental and health risks due to Cr(VI) oxidation, and current chrome-free tanning agents like vegetable, aldehyde, and synthetic agents fail to meet ecological and performance requirements, with formaldehyde risks and non-renewable materials causing pollution.
Innovation Solution
A method involving cyanuric chloride and plant biomass compounds under controlled conditions to produce a plant biomass-based active tanning agent, utilizing emulsifiers for dispersion and introducing active groups for collagen binding, achieving a synergistic tanning effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chrome-tanned leathers are used to achieve desirable comprehensive performances, then leather performance is improved, but environmental and health risks increase due to Cr(VI) oxidation
Solution Approach 1:
The patent removes chromium-based tanning agents from the leather tanning process and replaces them with plant biomass-based active tanning agents. This extraction of the harmful substance (chromium) while maintaining the essential function (tanning) resolves the contradiction between leather performance and environmental/health safety.
Solution Approach 2:
The patent uses plant biomass materials (such as tannin-rich plant extracts) as disposable, renewable tanning agents that can be easily replaced and do not persist as harmful substances in the environment, unlike chromium compounds that accumulate and cause long-term pollution and health issues.
2Object-affected harmful factors
If aldehyde and resin tanning agents are used as chrome-free alternatives, then environmental risks are reduced, but health risks and formaldehyde pollution increase
Solution Approach 1:
The patent employs plant biomass-based tanning agents that are natural, biodegradable, and do not release harmful formaldehyde. These renewable plant materials serve as temporary, disposable tanning agents that fulfill the tanning function without generating persistent harmful byproducts, resolving the formaldehyde pollution issue.
Solution Approach 2:
The patent changes the chemical composition parameters of the tanning agent from synthetic aldehyde and resin compounds to natural plant biomass compounds. This parameter change transforms the chemical properties to eliminate formaldehyde release while maintaining effective tanning capability through natural tannins and other plant compounds.
3Reliability
If synthetic tanning agents are used to achieve effective tanning, then tanning performance is improved, but environmental pollution and carbon emissions increase due to petroleum-based raw materials
Solution Approach 1:
The patent fundamentally changes the source and composition parameters of the tanning agent from petroleum-based synthetic materials to plant biomass-based natural materials. This parameter change maintains effective tanning performance through natural tannins and plant compounds while eliminating the environmental pollution and carbon emissions associated with fossil fuel extraction and processing.
Solution Approach 2:
The patent uses renewable, biodegradable plant biomass materials as tanning agents that can be sourced sustainably and decompose naturally after use, replacing persistent petroleum-based synthetics with disposable, eco-friendly alternatives that do not contribute to long-term environmental pollution or carbon accumulation.
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 plant biomass-based tanning agent provides safe, eco-friendly leathers with improved hydrothermal stability and physical properties, meeting regulatory standards and promoting sustainable leather production.
Implementation Method 1
A method involving cyanuric chloride and plant biomass compounds is used to prepare a plant biomass-based active tanning agent, utilizing nucleophilic substitution reactions
Implementation Method 2
adding dropwise an appropriate amount of an emulsifier and stirring evenly under a low-temperature reaction condition
Implementation Method 3
simultaneously, adding dropwise an alkali solution to control a reaction pH to be within a range of 4.0-8.0
Data Source
AI summary
Disclosed is a preparation method of a plant biomass-based active tanning agent. Under a low-temperature reaction condition, cyanuric chloride and a plant biomass compound are used to synthesize an environment-friendly plant biomass-based active tanning agent through a nucleophilic substitution reaction. The active tanning agent obtained in the present disclosure appears as a white or light brown emulsion at room temperature, and has substantial active groups such as hydroxyl groups, carboxyl groups and ester groups introduced into its structure, thus endowing leathers with desirable hydrothermal stability and physical properties and having a desirable synergistic effect with metal tanning agents. Meanwhile, health and environment risks caused by hexavalent chromium and free formaldehyde in leathers are avoided.