Core-Shell Rubber Particles for Tire Vibration and Noise
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Solution Overview
Problem
Rubber compositions for tires face a trade-off in achieving balanced improvements in fuel economy, abrasion resistance, and road noise-reducing properties, with existing solutions insufficiently addressing road noise reduction.
Innovation Solution
A rubber composition incorporating a core-shell structured particle with a core having a melt viscosity of 0.1 to 3,000 Pa·s and a shell formed of a polymer of conjugated diene or aromatic vinyl compounds, which acts as a reinforcing agent to improve abrasion resistance and reduce tire vibration, thereby enhancing fuel economy and road noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a core-shell structured particle with melamine resin core and silica shell is incorporated to improve fuel economy and abrasion resistance, then fuel economy and abrasion resistance are improved, but road noise-reducing properties are insufficient
Solution Approach 1:
The patent changes the physical state parameter of the core material from solid (melamine resin) to liquid (oil) with specific viscosity range (0.1 to 3000 Pa·s at 38°C). This parameter change enables the core to provide damping effect for road noise reduction while maintaining the reinforcing effect for fuel economy and abrasion resistance through the shell structure.
Solution Approach 2:
The patent creates a composite particle structure combining liquid core (oil) with polymer shell (conjugated diene and/or aromatic vinyl compound). This composite structure integrates the damping properties of liquid oil for noise reduction with the reinforcing properties of the polymer shell, achieving simultaneous improvement in fuel economy, abrasion resistance, and road noise reduction.
2Strength
If conventional core-shell structured particles are used to improve abrasion resistance, then abrasion resistance is improved, but road noise-reducing properties deteriorate
Solution Approach 1:
The patent changes the core material from solid particulate fillers to liquid oil with controlled viscosity, enabling the core to provide viscoelastic damping that reduces road noise while the polymer shell maintains abrasion resistance through reinforcing mechanisms.
Solution Approach 2:
The polymer shell acts as an intermediary between the liquid oil core and the rubber matrix. It provides the reinforcing effect for abrasion resistance while allowing the liquid core to provide damping for noise reduction, mediating between the conflicting requirements of strength and noise reduction.
3Strength
If rigid core-shell particles are incorporated to improve structural strength, then strength is improved, but vibration damping and road noise reduction are insufficient
Solution Approach 1:
The patent changes the core from rigid solid particles to liquid oil with specific viscosity range, transforming the mechanical properties from rigid to viscoelastic. This enables effective vibration damping through energy dissipation in the liquid phase while maintaining structural integrity through the polymer shell.
Solution Approach 2:
The patent utilizes the liquid phase of oil in the core to provide viscoelastic damping properties. The liquid phase allows for energy dissipation through internal friction and molecular rearrangement, effectively reducing tire vibration and road noise while the polymer shell maintains structural strength.
Data Source
AI summary
Provided is a rubber composition for tires achieving a balanced improvement of fuel economy, abrasion resistance, and road noise-reducing properties. The present invention relates to a rubber composition for tires, containing a core-shell structured particle including a core and a shell, the core having a melt viscosity at 38°C of 0.1 to 3, 000 Pa·s, the shell being formed of a polymer of a conjugated diene compound and/or an aromatic vinyl compound.