Silicon-Modified Diene Rubber Composition for Tire Wear and Processability
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Solution Overview
Problem
The conjugated diene polymer used in tire production has insufficient processability, and the cross-linked rubber it forms lacks wear resistance and fuel efficiency.
Innovation Solution
A conjugated diene polymer with a silicon content of 95 weight ppm or more and an ionic strength index of 75% or less, containing 1,3-butadiene and isoprene monomers, and optionally aromatic vinyl monomers, is developed to enhance processability and wear resistance while improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a modified conjugated diene polymer with specific molecular weight distribution is used, then wear resistance and fuel efficiency are improved, but processability becomes insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the silicon content (95-500 weight ppm) and ionic strength index (75% or less) of the conjugated diene polymer. This specific parameter range optimization resolves the contradiction by achieving both improved wear resistance/fuel efficiency and maintained processability, unlike previous modifications that prioritized performance at the cost of processability.
2Ease of manufacture
If conventional rubber compositions with carbon black are used, then processing is easier, but heat buildup is higher and fuel efficiency is poorer
Solution Approach 1:
The patent replaces carbon black with silica as the filler material and optimizes the silicon content and ionic strength index of the conjugated diene polymer. This parameter change in material composition achieves lower heat buildup and improved fuel efficiency while maintaining acceptable processability through the specific polymer modification parameters.
Data Source
AI summary
A conjugated diene polymer containing at least conjugated diene monomer units, wherein the conjugated diene polymer contains 95 weight ppm or more of silicon and has an ionic strength index of 75% or less.