Fiber-Reinforced Rubber Composition for Tire Sidewall Tear Resistance
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Solution Overview
Problem
Existing rubber compositions for tire sidewalls and other rubber articles face challenges in improving tensile tear performance due to dynamic flexing and abrasion, with existing solutions not effectively enhancing resistance to failure.
Innovation Solution
A rubber composition comprising an elastomer matrix of diene elastomers, carbon black, silica, a silane coupling agent, and short fibers, where the silica content exceeds carbon black, and the silane coupling agent and short fibers are within specific ranges, enhancing chemical and physical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rubber compositions are used for tire sidewalls, then basic rubber properties are maintained, but tensile tear performance is insufficient due to dynamic flexing and abrasion
Solution Approach 1:
The patent employs a composite reinforcement system combining silica particles, carbon black, and short fibers within the rubber matrix. This multi-component composite approach creates synergistic effects where silica and carbon black provide bulk reinforcement while short fibers bridge micro-cracks and prevent tear propagation, collectively enhancing tensile tear performance and reliability under dynamic flexing conditions
Solution Approach 2:
The silane coupling agent acts as an intermediary substance that chemically bonds the inorganic fillers (silica and carbon black) and organic short fibers to the rubber matrix. This intermediary layer improves interfacial adhesion, ensuring effective stress transfer from the rubber matrix to the reinforcement components, thereby enhancing both tensile tear performance and resistance to failure
2Strength
If silica content is increased to improve reinforcement, then tensile properties improve, but processing difficulty and cost increase
Solution Approach 1:
The silane coupling agent serves as a processing aid that reduces the agglomeration tendency of high silica content by providing steric and chemical barriers. It modifies the surface of silica particles to improve compatibility with the rubber matrix, facilitating easier mixing and processing while maintaining the high silica reinforcement level needed for superior tensile properties
Solution Approach 2:
The patent optimizes the silica-to-carbon black ratio and controls the particle size distribution of fillers to achieve a balance between reinforcement efficiency and processability. By adjusting these parameters, the composition achieves high tensile properties with reduced processing difficulty compared to conventional high-silica formulations
3Strength
If short fibers are added to enhance tear resistance, then tensile tear performance improves, but fiber length control and uniform distribution become more difficult
Solution Approach 1:
The patent specifies a controlled short fiber length range (0.5-5 mm) and optimizes the fiber aspect ratio to achieve effective tear resistance while maintaining manufacturability. This parameter optimization ensures that fibers are long enough to bridge cracks and provide reinforcement but short enough to be uniformly distributed during standard mixing and processing operations
Solution Approach 2:
The silane coupling agent improves the interfacial bonding between short fibers and the rubber matrix, preventing fiber agglomeration and ensuring uniform distribution. This intermediary action allows shorter fibers to be effectively utilized without the need for complex dispersion technologies, thereby maintaining manufacturing precision
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 unexpectedly improved tensile tear performance, demonstrating enhanced resistance to tearing and failure in dynamic conditions.
Implementation Method 1
a silane coupling agent, wherein the amount of the silane coupling agent is more than 0.0% and less than 5.0%, that is between 0.0% and 5.0%, by weight per 100% by weight of the silica
Implementation Method 2
a carbon black, a silica, wherein the amount in phr of the silica is higher than that of the carbon black
Implementation Method 3
short fibers, wherein the amount of the short fibers is more than 0.0 phr and less than 5.0 phr, that is between 0.0 and 5.0 phr, and wherein the number-average length of the short fibers is less than 10 mm
Data Source
AI summary
A rubber composition based on at least an elastomer matrix, a carbon black, a silica, a silane coupling agent and short fibers, wherein the amount in phr of the silica is higher than that of the carbon black, wherein the amount of the silane coupling agent is more than 0.0% and less than 5.0% by weight per 100% by weight of the silica, wherein the amount of the short fibers is more than 0.0 phr and less than 5.0 phr and wherein the number-average length of the short fibers is less than 10 mm.