Tire Rubber Composition Elastic Microparticles Rigidity Wear
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Solution Overview
Problem
Conventional tire rubber compositions using silica as a reinforcing filler result in lower rigidity and wear resistance, compromising the performance of pneumatic tires.
Innovation Solution
A tire rubber composition incorporating elastic microparticles crosslinked from a crosslinkable oligomer or polymer, with specific hardness and elongation properties, combined with diene rubber and optional carbon black or white fillers, to enhance the rigidity and wear resistance of pneumatic tires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silica is used as a reinforcing filler for the tread, then low heat build-up is achieved, but reinforcing effect is low due to lower affinity with rubber compared to carbon black
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between silica and rubber. The silane coupling agent chemically bonds to both silica and rubber, creating a bridge that enhances the interfacial adhesion and transmitting mechanical stress effectively from the rubber matrix to the silica filler, thereby achieving reinforcing effects comparable to carbon black while maintaining the low heat build-up properties of silica
Solution Approach 2:
The invention creates a composite material system consisting of silica, silane coupling agent, and rubber. This multi-component composite leverages the low heat build-up特性 of silica, the bonding capability of silane coupling agent, and the elastomeric properties of rubber to achieve a balance between thermal performance and mechanical strength that neither component could achieve alone
2Temperature
If the amount of silica is decreased to satisfy low heat build-up, then heat build-up is reduced, but wear resistance performance and grip performance are largely decreased
Solution Approach 1:
The invention changes the chemical and physical parameters of the silica-rubber interface by introducing silane coupling agents and using terminal-modified SBR. This modifies the surface chemistry of silica and the reactive groups of rubber to enhance interfacial bonding, allowing reduced silica content while maintaining wear resistance and grip performance through improved stress transfer efficiency at the filler-rubber interface
3Strength
If carbon black is used as a reinforcing filler, then reinforcing effect is high, but heat build-up increases
Solution Approach 1:
The invention changes the material composition parameter by replacing carbon black with silica as the primary reinforcing filler. Silica has inherently lower heat generation characteristics compared to carbon black due to its chemical structure and thermal conductivity properties, allowing the tire to maintain structural strength while operating at lower temperatures
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 effectively improves the rigidity and wear resistance of pneumatic tires, providing better performance compared to previous solutions.
Implementation Method 1
crosslinking a crosslinkable oligomer or polymer capable of satisfying predetermined hardness and elongation during curing of the oligomer or polymer alone in an organic solvent or water
Implementation Method 2
a tire rubber composition containing 100 parts by mass of diene rubber (A) and from 1 to 50 parts by mass of elastic microparticles (B)
Data Source
Figure 1
AI summary
Provided are a tire rubber composition capable of producing a pneumatic tire having excellent rigidity and wear resistance and a pneumatic tire using the same. The tire rubber composition includes 100 parts by mass of a diene rubber (A) and from 1 to 50 parts by mass of elastic microparticles (B), wherein the elastic microparticles (B) have a form of microparticles obtained by crosslinking a crosslinkable oligomer or polymer (b1) in water or an organic solvent, or in the diene rubber (A), and have an average particle size of from 0.001 to 100 µm, the JIS A hardness of a cured product obtained by crosslinking the crosslinkable oligomer or polymer (b1) without use of water, the organic solvent or the diene rubber (A) is greater than 45, and the elongation of the cured product is 200% or greater.