Modified Tire Rubber Composition for Lower Rolling Resistance
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Solution Overview
Problem
Current rubber compositions used in tires fail to adequately reduce rolling resistance while maintaining other performance metrics such as processability, reinforcing properties, and steering stability, which are essential for improved fuel efficiency.
Innovation Solution
A rubber composition incorporating a conjugated diene-based polymer modified with a specific oligosiloxane and tertiary amino group modifier, enhancing filler dispersibility and improving low heat generating properties without compromising other tire performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the content of filler such as carbon black is reduced to improve low heat generating properties, then rolling resistance is reduced, but processability, reinforcing properties, wear resistance, and steering stability deteriorate
Solution Approach 1:
The patent introduces a silane-modified conjugated diene-based polymer as an intermediary substance that mediates between the filler and the rubber matrix. The silane groups on the polymer surface interact with filler particles while the conjugated diene structure maintains rubber elasticity, thereby improving filler dispersibility and maintaining reinforcing properties even at reduced filler content
Solution Approach 2:
The patent uses a composite rubber composition comprising silane-modified conjugated diene-based polymer, other diene-based polymer, and filler. This composite structure combines the low heat generating properties of the silane-modified polymer with the reinforcing effects of the filler and other diene-based polymers, achieving both reduced rolling resistance and maintained performance
2Loss of energy
If a modified conjugated diene-based polymer is used to improve filler dispersibility and reduce rolling resistance, then low heat generating properties are improved, but the improvement effect is insufficient to meet recent fuel efficiency demands
Solution Approach 1:
The patent optimizes specific parameters of the silane-modified polymer including the type of silane groups (alkoxysilane, aminosilane, or carboxysilane), the molecular weight of the conjugated diene polymer, and the ratio of modified to unmodified polymer in the composition. These parameter optimizations achieve greater rolling resistance reduction and improved fuel efficiency
Data Source
AI summary
This disclosure provides a rubber composition that can realize excellent low heat generating properties without deteriorating other performance. The rubber composition contains a rubber component and a filler, where the rubber component contains a conjugated diene-based polymer modified with a modifier containing a compound represented by the formula (1).