Water-Responsive Tire Rubber Composition for Wet Grip and Fuel Economy
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Solution Overview
Problem
Conventional rubber compositions for tires face challenges in maintaining optimal grip performance across dry and wet road conditions, leading to reduced wet grip performance and fuel economy due to changes in road conditions and the hardness of the rubber compounds.
Innovation Solution
A rubber composition with a hardness that reversibly changes with water, specifically designed to satisfy certain hardness and tan δ relationships, incorporating isoprene-based, polybutadiene, and styrene-butadiene rubbers, and a polymer with a carbon-carbon double bond and heteroatom, which forms reversible molecular bonds with water, ensuring improved grip and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber compounds are softened with softeners such as oil to improve wet grip performance, then wet grip performance is improved, but fuel economy deteriorates
Solution Approach 1:
The invention changes the physical-chemical parameters of the rubber compound by incorporating a polymer with specific functional groups (carboxyl, hydroxyl, or amine groups) that can form hydrogen bonds with water. This allows the rubber to dynamically adjust its hardness in response to water presence without requiring softeners, thereby improving wet grip performance while avoiding the fuel economy penalty associated with oil-based softeners
Solution Approach 2:
The invention creates a composite rubber compound system combining diene rubber with a polymer containing heteroatoms (oxygen, nitrogen, silicon, sulfur, phosphorus, or halogen atoms) that can form hydrogen bonds with water. This composite structure enables the material to exhibit water-responsive hardness changes, providing both improved wet grip and maintained fuel economy
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 provides enhanced wet and dry grip performance and improved fuel economy by adjusting hardness in response to water conditions, maintaining optimal road contact and reducing skidding risks.
Implementation Method 1
a polymer having a carbon-carbon double bond and a heteroatom, which forms reversible molecular bonds with water
Implementation Method 2
the polymer having a carbon-carbon double bond and a heteroatom, which forms 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, dry grip performance, and fuel economy. The present invention relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationships (1) and (2): Hardnesswhendry−Hardnesswhenwater-wet≥1 wherein each hardness represents the JIS-A hardness at 25°C of the rubber composition; and tanδat70°Cwhendry<0.14 wherein the tan δ at 70°C represents the loss tangent measured at 70°C, an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz.