Tyre Tread Composition Using Peroxide Crosslinking
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Solution Overview
Problem
Conventional tire treads face challenges in balancing rolling resistance, grip on wet surfaces, ease of implementation, and temperature resistance, as improving one performance often compromises others.
Innovation Solution
A tire tread composition featuring a diene elastomer, thermoplastic elastomer block copolymer, and a crosslinking system based on organic peroxide, which reconciles low rolling resistance, good wear resistance, and high temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tread composition with diene elastomer and thermoplastic elastomer is used with sulphur crosslinking, then adhesion is improved, but rolling resistance increases and temperature resistance deteriorates
Solution Approach 1:
The patent changes the crosslinking chemistry from sulphur-based to peroxide-based crosslinking. This parameter change in the chemical composition of the crosslinking system enables simultaneous achievement of low rolling resistance, good adhesion, and high temperature resistance by forming a different types of crosslinks that are more stable at high temperatures and produce less hysteresis loss.
Solution Approach 2:
The patent uses a composite material system combining diene elastomer (35-99 phr), thermoplastic elastomer block copolymer (1-65 phr), and peroxide crosslinking system. This composite approach leverages the complementary properties of different elastomers and the superior thermal stability of peroxide crosslinks to achieve a balance of rolling resistance, adhesion, and temperature resistance that cannot be obtained with conventional sulphur crosslinking alone.
2Loss of energy
If the thermoplastic elastomer content is increased to reduce rolling resistance, then rolling resistance improves, but wear resistance deteriorates
Solution Approach 1:
The patent optimizes the content range of thermoplastic elastomer block copolymer to 1-65 phr, which is sufficient to reduce rolling resistance through reduced hysteresis loss while maintaining adequate wear resistance. Additionally, the peroxide crosslinking system compensates for any potential wear resistance reduction by creating stronger crosslinks that enhance the overall durability of the tread material.
3Loss of energy
If peroxide crosslinking is used to achieve low rolling resistance and good temperature resistance, then rolling resistance and temperature resistance improve, but the composition requires optimization of crosslinking agents
Solution Approach 1:
The patent specifies a peroxide crosslinking system with controlled peroxide content (0.1-5 phr) and includes optional synergistic agents such as sulfur (0-5 phr), metal oxides (0-10 phr), and organic compounds (0-10 phr). This optimized parameter range achieves low rolling resistance and good temperature resistance while managing the complexity of the crosslinking system through defined composition limits and synergistic interactions.
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 achieves a notable improvement in rolling resistance, wear resistance, and thermal resistance while reducing the need for reinforcing fillers and plasticizers, enhancing performance balance and manufacturing ease.
Implementation Method 1
a crosslinking system based on organic peroxide
Data Source
AI summary
The present invention concerns a tyre of which at least the tread comprises a composition made from at least a diene elastomer, at a concentration of between 35 et 99 phr (parts per hundred rubber by weight), a thermoplastic elastomer of the elastomer block copolymer and thermoplastic block copolymer type, at a concentration of between 1 and 65 phr, and a crosslinking system made from organic peroxide.