Rubber Composition Wear Resistance Molecular Weight Control
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Solution Overview
Problem
Current tire rubber compositions do not adequately address wear resistance, despite the use of silane coupling agents, indicating a need for further improvement in tire durability.
Innovation Solution
A rubber composition combining high molecular weight styrene butadiene rubber, butadiene rubber, and a specific blend of vulcanization accelerators, along with an aromatic hydrocarbon-rich oil, to enhance wear resistance by forming a sea-island structure and improving reinforcing filler dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high molecular weight rubber is used to improve strength, then wear resistance improves, but processing difficulty increases
Solution Approach 1:
The patent controls the molecular weight of each rubber component within specific ranges (SBR: 100,000-500,000, BR: 200,000-1,000,000, IR: 50,000-200,000) to balance high strength properties with adequate processability, avoiding the extremes that would cause either poor wear resistance or processing difficulties
Solution Approach 2:
The combination of different rubber types with complementary molecular weight characteristics creates a composite system where the overall composition maintains processability while individual high molecular weight components contribute to wear resistance
2Reliability
If reinforcing filler content is increased to improve wear resistance, then wear resistance improves, but fuel economy deteriorates due to increased rolling resistance
Solution Approach 1:
The patent optimizes the molecular weight and composition of the rubber matrix to achieve effective filler dispersion and interaction at moderate filler loadings, reducing the need for excessive filler that would increase rolling resistance while maintaining wear resistance through improved rubber-filler bonding
Solution Approach 2:
The patent creates localized regions of enhanced reinforcement through controlled filler distribution within the specific rubber matrix composition, providing wear resistance where needed while minimizing overall filler content to reduce rolling resistance
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 significantly improves wear resistance and fuel economy by alleviating stress concentration and uniformizing crosslink density, outperforming conventional tire rubber compositions.
Implementation Method 1
a sulfenamide-based vulcanization accelerator; a guanidine-based vulcanization accelerator; and a thiazole-based vulcanization accelerator
Implementation Method 2
an oil having an aromatic hydrocarbon content of not less than 20% by mass; and a content of the oil is not less than 10 parts by mass per 100 parts by mass of the rubber component
Data Source
AI summary
Provided are a rubber composition that allows wear resistance to be improved, and a pneumatic tire using the same. A rubber composition, for a tire, according to the present invention includes: a rubber component that contains a first styrene butadiene rubber having a weight-average molecular weight of not less than 1000000, a second styrene butadiene rubber having a weight-average molecular weight of not less than 100000 and not greater than 400000, and a butadiene rubber having a weight-average molecular weight of not less than 400000 and not greater than 1000000; an oil having an aromatic hydrocarbon content of not less than 20% by mass; a sulfenamide-based vulcanization accelerator; a guanidine-based vulcanization accelerator; and a thiazole-based vulcanization accelerator, and a content of the oil is not less than 10 parts by mass per 100 parts by mass of the rubber component.