Rubber Composition for Tire with Cyclic Polysulfide
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Solution Overview
Problem
Conventional rubber compositions for high-performance tires face challenges in achieving simultaneous improvements in steering stability, wet performance, wear resistance, and low rolling resistance, with increased carbon black and silica content leading to performance degradation and heat-related issues.
Innovation Solution
A rubber composition blending 50 wt% or more of styrene-butadiene rubber with 0.2 to 5 parts by weight of cyclic polysulfide, 1 to 30 parts by weight of aromatic denatured terpene resin, 20 to 80 parts by weight of silica, and 40 to 100 parts by weight of carbon black, with a total silica and carbon black ratio of 70 to 130 parts by weight, enhancing grip performance and resistance while maintaining low rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of carbon black or silica is increased to improve steering stability and wet performance, then the steering stability and wet performance are improved, but the rolling resistance decreases and wear resistance decreases
Solution Approach 1:
The patent optimizes the specific parameters of carbon black (using N2SA≥140 m2/g and IA≥165 mg/g to achieve N2SA/IA≥0.85) and silica (using N2SA≥140 m2/g and IA≥165 mg/g to achieve N2SA/IA≥0.85) to achieve the desired balance between steering stability and rolling resistance without simply increasing the total amount of additives
Solution Approach 2:
The patent uses a composite system combining specific ratios of carbon black and silica (total 70-130 parts by weight per 100 parts of diene-based rubber) with styrene-butadiene rubber to achieve synergistic effects that simultaneously improve steering stability while maintaining acceptable rolling resistance and wear resistance
2Reliability
If the total amount of carbon black and silica is increased to improve wet performance, then the wet performance is improved, but the sustainability of grip performance during high-speed travelling decreases
Solution Approach 1:
The patent optimizes the surface area parameters (N2SA and IA) and their ratio for both carbon black and silica to achieve optimal reinforcement efficiency, allowing sufficient grip performance sustainability without excessively increasing the total additive content
Solution Approach 2:
The patent specifies different property ranges for carbon black and silica (with carbon black having 40-100 parts by weight and silica having 20-80 parts by weight) to optimize their respective local contributions to grip performance sustainability and wet performance
3Reliability
If the amount of carbon black and silica is increased to improve steering stability, then the steering stability is improved, but the tire experiences performance degradation due to heat, decreasing blow-out resistance
Solution Approach 1:
The patent optimizes the surface area characteristics (N2SA and IA ratios) of carbon black and silica to achieve optimal heat dissipation and reinforcement efficiency, reducing thermal degradation without sacrificing steering stability
Solution Approach 2:
The patent specifies different amount ranges for carbon black (40-100 parts) and silica (20-80 parts) to balance their respective contributions to steering stability and thermal management, preventing excessive heat buildup
Data Source
AI summary
A rubber composition for a tire is blended with diene-based rubber containing 50 wt % or more of SBR, and 0.2 to 5 parts by weight of cyclic polysulfide represented by the below formula (I), 1 to 30 parts by weight of aromatic denatured terpene resin, 20 to 80 parts by weight of silica, and 40 to 100 parts by weight of carbon black relative to 100 parts by weight of the diene-based rubber. Further, a total blending amount of the silica and the carbon black is 70 to 130 parts by weight.In the formula, R represents a substituted or unsubstituted alkylene group having 2 to 18 carbon atoms, a substituted or unsubstituted oxyalkylene group having 2 to 18 carbon atoms, or an alkylene group including an aromatic ring, x represents an average number of 2 to 6, and n represents an integer of 1 to 15.