Olefinic Epoxide Elastomer Tyre Crosslinked by Polycarboxylic Acid
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Solution Overview
Problem
Conventional tire rubber compositions face challenges in maintaining stable properties over time due to repeated mechanical and thermal stresses, particularly in terms of thermo-oxidation resistance, wear resistance, and the trade-off between rolling resistance and grip on various surfaces.
Innovation Solution
A tire composition utilizing an olefinic elastomer with epoxy functions, a poly-carboxylic acid, and an imidazole as a crosslinking system, which provides improved resistance to thermo-oxidation and mechanical properties, simplifying the manufacturing process compared to conventional vulcanized diene elastomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sulfur vulcanization system is used, then crosslinking is achieved, but the composition complexity increases due to multiple additives (accelerators, activators, retarders)
Solution Approach 1:
The patent extracts and removes the complex sulfur vulcanization system (sulfur, accelerators, activators, retarders) and replaces it with a simplified crosslinking system based solely on poly-carboxylic acid and imidazole. This eliminates unnecessary components while maintaining crosslinking effectiveness, directly resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent changes the chemical parameters of the crosslinking system by switching from sulfur-based chemistry to poly-carboxylic acid/imidazole chemistry. This parameter change fundamentally simplifies the composition while achieving the same crosslinking function, resolving the technical contradiction.
2Reliability
If diene elastomer matrix is used, then good vulcanization response is achieved, but resistance to thermo-oxidation deteriorates over time
Solution Approach 1:
The patent uses a composite material approach by combining olefinic elastomer (providing thermo-oxidation stability) with epoxy functions (enabling crosslinking). This composite structure integrates the benefits of both materials: the stability of olefinic elastomers and the crosslinking capability of epoxy groups, resolving the contradiction between vulcanization response and thermo-oxidation resistance.
Solution Approach 2:
The patent changes the fundamental chemical composition from diene-based to olefinic-based elastomer, fundamentally altering the material's resistance to thermo-oxidation while maintaining elastomeric properties. This parameter change in the base polymer structure resolves the stability issue.
3Ease of manufacture
If simplified crosslinking system is used, then manufacturing process is simplified, but mechanical properties may deteriorate
Solution Approach 1:
The patent introduces imidazole as an intermediary substance that facilitates the crosslinking reaction between poly-carboxylic acid and epoxy groups. This intermediary enables efficient crosslinking and network formation with the simplified system, ensuring that mechanical properties are maintained despite the reduction in composition complexity.
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 composition exhibits enhanced mechanical and dynamic properties, improved resistance to thermo-oxidation, and a better balance between stiffness and hysteresis, leading to increased tire endurance and performance.
Implementation Method 1
a crosslinking system comprising a poly-carboxylic acid of general formula (I) and an imidazole of general formula (II)
Data Source
AI summary
The present invention relates to a tyre comprising a rubber composition with a base of at least one olefinic elastomer comprising epoxide functions as the majority elastomer, at least one reinforcing filler, and a cross-linking system comprising a polycarboxylic acid with general formula (I) (I) in which A represents a covalent bond or a hydrocarbon group comprising at least 1 carbon atoms, optionally substituted and optionally interrupted by one or more heteroatoms, and an imidazole with general formula (II) (II) in which - R1 represents a hydrocarbon group or a hydrogen atom, - R2 represents a hydrocarbon group, - R3 and R4 represent, independently of each other, a hydrogen atom or a hydrocarbon group, or R3 and R4 form a cycle together with the carbon atoms of the imidazole cycle to which they bond.