Diene Copolymer Rubber Composition Abrasion Grip Balance
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Solution Overview
Problem
Conventional rubber compositions for high-performance tires face a trade-off between abrasion resistance and grip performance, with styrene-butadiene copolymers exhibiting temperature dependency and poor dispersibility of carbon black leading to decreased abrasion resistance.
Innovation Solution
A rubber composition incorporating a diene copolymer with a linear and branched conjugated diene monomer unit, a weight-average molecular weight of 1000 to 3000000, and a hydrogenation rate of at least 15%, along with an organic compound and filler, to balance abrasion resistance and grip performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SBR with high Tg is used to improve grip performance, then grip performance is improved, but temperature dependency increases
Solution Approach 1:
The patent changes the molecular weight parameter of the diene copolymer to a low range (1,000 to 300,000), which fundamentally alters the temperature-dependent mechanical properties. This low molecular weight configuration reduces the temperature dependency of hardness while maintaining high grip performance through optimized tanδ characteristics at room temperature.
Solution Approach 2:
The patent creates a composite rubber composition combining low molecular weight diene copolymer with specific fillers (carbon black, silica) and vulcanizing agents. This composite structure achieves synergistic effects where the low molecular weight polymer provides temperature stability and the filler system enhances both grip and abrasion resistance simultaneously.
2Reliability
If small-particle-diameter carbon black and large amount of softener are used to improve grip performance, then grip performance is improved, but dispersibility of carbon black deteriorates
Solution Approach 1:
The patent changes the particle size parameter of carbon black to a specific range (20 to 300 nm) and controls the softener content within 5-50 parts by mass per 100 parts of rubber component. This optimized parameter combination ensures excellent dispersibility of carbon black while maintaining high grip performance.
Solution Approach 2:
The patent introduces silica as an intermediary filler that facilitates uniform dispersion of carbon black particles within the rubber matrix. The silica acts as a dispersing agent that prevents carbon black aggregation, enabling both high grip performance and excellent compositional stability.
3Ease of manufacture
If low-molecular-weight styrene-butadiene copolymer is used to improve processability, then processability is improved, but hydrogenation rate is limited due to bleeding
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific range (1,000 to 300,000) and controls the hydrogenation rate within 10-90%. This parameter optimization prevents bleeding of the low molecular weight component while maintaining excellent processability and achieving high hydrogenation rates for improved abrasion resistance.
Solution Approach 2:
The patent introduces dynamic control of the polymer structure through varying molecular weight distribution and hydrogenation degree. This dynamic approach allows the material to exhibit optimal processability during manufacturing while achieving high final performance through controlled hydrogenation without bleeding issues.
4Reliability
If tanδ of rubber is increased to improve grip performance, then grip performance is improved, but hardness at room temperature increases and abrasion resistance deteriorates
Solution Approach 1:
The patent changes multiple parameters simultaneously: low molecular weight (1,000 to 300,000), specific hydrogenation rate (10-90%), and optimized filler content. This multi-parameter optimization achieves the difficult balance of high tanδ for grip performance while maintaining appropriate hardness for abrasion resistance.
Solution Approach 2:
The patent creates a composite system where low molecular weight diene copolymer is combined with optimized carbon black and silica fillers. This composite structure allows the polymer matrix to provide high tanδ for grip while the filler network maintains surface hardness for abrasion resistance, resolving the trade-off between these two properties.
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 improved abrasion resistance and grip performance balance, with enhanced processability and mechanical strength, while maintaining favorable physical properties.
Implementation Method 1
the diene copolymer (B) has a linear conjugated diene monomer unit and a branched conjugated diene monomer unit, a weight-average molecular weight of 1000 to 3000000 and a hydrogenation rate of not less than 15%
Data Source
AI summary
A diene copolymer (B) that can improve abrasion resistance and grip performance in a balanced manner, a rubber composition in which the diene copolymer (B) is used, and a pneumatic tire are provided. The diene copolymer (B) has a linear conjugated diene monomer unit and a branched conjugated diene monomer unit, has a weight-average molecular weight of 1000 to 3000000, and has a hydrogenation rate of not less than 15%.