Water-Responsive Rubber Composition for Tire Grip
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Solution Overview
Problem
Conventional rubber compositions for tires experience a reduction in grip performance when transitioning from dry to wet conditions due to changes in dynamic modulus, leading to inconsistent wet and dry grip performance.
Innovation Solution
A rubber composition with a dynamic modulus that reversibly changes with water, specifically satisfying the relationship Dynamic modulus E* when water-wet / Dynamic modulus E* when dry × 100% ≤ 90%, incorporating a diene rubber and a polymer with a carbon-carbon double bond and a heteroatom, such as oxygen, nitrogen, or silicon, to form reversible molecular bonds with water, ensuring optimal grip performance across varying road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber compositions are used, then dry grip performance is maintained, but wet grip performance deteriorates due to increased dynamic modulus when wet
Solution Approach 1:
The patent applies parameter changes by incorporating a polymer with specific chemical structure (carbon-carbon double bond and heteroatom) that changes its dynamic modulus parameter in response to water presence. This polymer causes the rubber composition to become softer when wet, reversing the conventional trend of hardening, thereby improving wet grip performance while maintaining dry grip performance.
Solution Approach 2:
The patent uses composite materials by combining conventional rubber components with a specific polymer having carbon-carbon double bond and heteroatom. This composite structure allows the material to exhibit dual characteristics: maintaining the structural integrity and dry grip of conventional rubber while adding the water-responsive softening property of the polymer, thus resolving the contradiction between dry and wet grip performance.
2Reliability
If the dynamic modulus remains constant or increases when wet, then structural stability is maintained, but road contact area reduces leading to poor wet grip
Solution Approach 1:
The patent applies dynamics by making the dynamic modulus a variable parameter that responds to environmental conditions (water presence). The polymer with carbon-carbon double bond and heteroatom enables the rubber composition to dynamically adjust its stiffness: maintaining stability when dry and becoming softer when wet, thus optimizing road contact area under different operating conditions.
Solution Approach 2:
The patent changes the physical parameter of dynamic modulus based on moisture content. The incorporated polymer causes the dynamic modulus to decrease when water is present, allowing the material to adapt its mechanical properties to operating conditions, thereby maintaining adequate road contact area on wet surfaces without compromising structural stability when dry.
3Reliability
If silica-containing rubber compositions are used to improve wet grip, then wet grip performance increases, but overall performance including dry grip and fuel economy remains insufficient
Solution Approach 1:
The patent uses parameter changes by incorporating a polymer that responds to water presence, causing the dynamic modulus to decrease when wet. This approach improves wet grip performance while maintaining dry grip performance, providing versatile overall performance across different road conditions without the compromises associated with silica-containing compositions.
Solution Approach 2:
The patent achieves universality by creating a rubber composition that performs well across multiple conditions (dry and wet). The polymer with carbon-carbon double bond and heteroatom provides multi-functionality: maintaining structural integrity and grip on dry surfaces while enabling softening and improved contact on wet surfaces, thus delivering adaptable overall performance.
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 rubber composition maintains improved wet and dry grip performance by adjusting its dynamic modulus in response to water presence, enhancing road contact area and reducing skidding risks on both wet and dry roads.
Implementation Method 1
a polymer having a carbon-carbon double bond and a heteroatom... to form reversible molecular bonds with water
Data Source
AI summary
The present invention aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present invention relates to a rubber composition having a dynamic modulus E* that reversibly changes with water and satisfying the following relationship (1): DynamicmodulusE*whenwater-wet/DynamicmodulusE*whendry×100%≤90%