Tire Tread Rubber Composition Silica Dispersion
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Solution Overview
Problem
Current rubber compositions for tire treads face challenges in achieving a balance between low rolling resistance, wet performance, wear resistance, and processability, particularly due to poor dispersion of silica and inadequate affinity with rubber components, which limits their effectiveness in reducing rolling resistance and enhancing wet grip.
Innovation Solution
A rubber composition combining a conjugated diene-based rubber with a specified silica and alkyltriethoxysilane, where the silica has specific surface areas and the alkyltriethoxysilane content is within a certain range, enhancing dispersibility and interaction with the rubber, thereby improving wet performance, rolling resistance, and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is simply added to the rubber component, then the rolling resistance reduction effect and wet performance improvement effect cannot be sufficiently achieved, but the silica is not dispersed due to low affinity with rubber components and high cohesiveness between silica components
Solution Approach 1:
The patent uses a silane coupling agent as an intermediary substance between silica and rubber components. The silane coupling agent contains both silane groups that bond with silica and organic groups that are compatible with rubber, thereby improving silica dispersion and affinity with the rubber matrix while maintaining wet performance and reducing rolling resistance
Solution Approach 2:
The patent creates a composite material system consisting of silica, silane coupling agent, and rubber components. This composite structure allows the silica to be effectively integrated into the rubber matrix through the silane coupling agent, resolving the dispersion issue while maintaining the desired performance characteristics
2Loss of energy
If silica is added to achieve low rolling resistance and wet performance, then the rolling resistance and wet performance are improved, but the processability deteriorates due to poor dispersion
Solution Approach 1:
The silane coupling agent serves as a mediator that improves silica dispersion in the rubber compound, thereby maintaining low rolling resistance and wet performance while improving processability by ensuring uniform distribution of silica throughout the rubber matrix
3Reliability
If the affinity between silica and rubber is improved, then the wet performance and rolling resistance are enhanced, but the wear resistance deteriorates
Solution Approach 1:
The patent optimizes the content of the silane coupling agent and silica within specific ranges to achieve the desired balance. By controlling these parameters, the patent improves wet performance and reduces rolling resistance while maintaining adequate wear 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 proposed composition achieves excellent wet performance, low rolling resistance, and wear resistance while maintaining good processability, outperforming previous compositions by ensuring proper dispersion and reinforcement of silica within the rubber matrix.
Implementation Method 1
an alkyltriethoxysilane (C) represented by the following formula (I)... the combined use of a rubber component containing a predetermined content of a specified conjugated diene-based rubber, a specified silica, and a specified alkylsilane
Implementation Method 2
a silica (B) having a nitrogen adsorption specific surface area from 194 to 225 m2/g and a cetyl trimethyl ammonium bromide (CTAB) adsorption specific surface area from 180 to 210 m2/g
Data Source
AI summary
A rubber composition for a tire tread of the present technology comprises a rubber component containing not less than 30 mass % of a conjugated diene-based rubber (A), a silica (B), and a predetermined alkyltriethoxysilane (C), the conjugated diene-based rubber (A) containing not less than 5 mass % of a specified structural member (a), the silica (B) having a nitrogen adsorption specific surface area (N2SA) from 194 to 225 m2/g and a CTAB adsorption specific surface area (CTAB) from 180 to 210 m2/g, a content of the silica (B) being from 60 to 150 parts by mass per 100 parts by mass of the rubber component, and a content of the alkyltriethoxysilane (C) being from 2.5 to 8.0 mass % relative to the silica (B).