Tyre Rubber Compound Chelating Agent Zinc Migration
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Solution Overview
Problem
The existing tyre rubber compounds using stearic acid and zinc oxide as curing agents face issues with zinc stearate migration, leading to 'blooming' which reduces surface adhesion, and the limitations of organic-solvent-based cements and adhesive resins necessitate a solution to enhance surface adhesion without solvent-based compounds.
Innovation Solution
A tyre rubber compound incorporating a cross-linkable unsaturated-chain polymer base with a curing system comprising sulphur, stearic acid, zinc oxide, and a chelating agent that complexes zinc ions, such as EDTA, to prevent zinc stearate migration and enhance surface adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stearic acid and zinc oxide are used as curing agents, then curing activation is achieved, but zinc stearate migration occurs causing blooming which reduces surface adhesion
Solution Approach 1:
A chelating agent is introduced as an intermediary substance that complexes with zinc ions to form stable chelates. This prevents the zinc ions from reacting with stearic acid to form migratory zinc stearate, thereby eliminating the blooming effect while maintaining curing activation. The chelating agent acts as a mediator between zinc oxide and stearic acid, controlling their interaction.
Solution Approach 2:
The chemical state of zinc ions is changed by introducing chelating agents that alter their reactivity. The chelating agents modify the chemical parameters of the curing system by forming stable complexes with zinc ions, changing their availability and preventing unwanted side reactions that lead to blooming.
2Strength
If organic-solvent-based cements are used to connect green compounds, then effective connection is achieved, but environmental regulations restrict their use
Solution Approach 1:
The harmful organic solvents are extracted and removed from the cement composition. The invention replaces solvent-based cements with water-based or solvent-free alternatives that maintain adhesive properties without the environmental hazards of organic solvents, thereby achieving both effective connection and regulatory compliance.
Solution Approach 2:
The base liquid composition is changed from organic-solvent-based to water-based or alternative carriers. This parameter change in the cement formulation maintains the necessary adhesive strength for connecting green compounds while eliminating the environmental and health issues associated with organic solvents.
3Strength
If adhesive resins are used to enhance compound connection, then connection strength is improved, but hysteresis losses increase
Solution Approach 1:
The adhesive resin content is optimized to a specific range (1-5 phr) to achieve the necessary connection strength while minimizing hysteresis losses. By precisely controlling the resin concentration parameter, the invention balances adhesive performance with energy efficiency, avoiding excessive resin addition that would increase hysteresis.
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 use of a chelating agent effectively prevents zinc stearate migration, improving surface adhesion over time and allowing for reduced use of adhesive resins, while maintaining the curing properties of the compound.
Implementation Method 1
a chelating agent for complexing the zinc ion
Implementation Method 2
at least one cross-linkable, unsaturated-chain polymer base, and a curing system comprising at least sulphur, stearic acid, and zinc oxide
Data Source
AI summary
A tire rubber compound having at least one cross-linkable, unsaturated-chain polymer base, and a curing system of at least sulphur, stearic acid, zinc oxide, and a chelating agent for complexing the zinc ion.