Polymer Composition for Low Rolling Resistance Tires
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Solution Overview
Problem
Current tire polymer compositions that aim to reduce rolling resistance often compromise on wet grip performance and mechanical properties due to reduced filler content and particle size, leading to insufficient abrasion resistance and grip on wet surfaces.
Innovation Solution
A polymer composition incorporating silica as a filler, along with polymers (B) and (C) derived from conjugated diene and aromatic vinyl compounds, featuring specific functional groups and molecular weights, which are incompatible and unevenly distribute the filler for enhanced low loss, abrasion resistance, and wet grip performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the amount of filler such as carbon black and silica is reduced or carbon black having a large particle diameter is used, then rolling resistance is reduced, but reinforcing property, abrasion resistance and wet grip property deteriorate
Solution Approach 1:
The invention changes the particle size parameter of silica filler to a specific range (0.5-2.0 μm) and controls the filler content within optimal limits, achieving both low rolling resistance and good reinforcing property. This parameter optimization resolves the contradiction by finding the sweet spot where energy loss is minimized while maintaining structural strength.
Solution Approach 2:
The invention uses a composite filler system combining silica with specific polymers (polymer B and polymer C) that have different glass transition temperatures and functional groups. This composite approach allows the filler to provide both low rolling resistance and adequate reinforcing property through synergistic interactions between different materials.
2Loss of energy
If the amount of filler such as carbon black and silica is reduced or carbon black having a large particle diameter is used, then rolling resistance is reduced, but abrasion resistance deteriorates
Solution Approach 1:
The invention optimizes the particle size parameter of silica to 0.5-2.0 μm and controls filler content within specific limits, achieving a balance between low rolling resistance and high abrasion resistance. This parameter optimization resolves the contradiction by finding the sweet spot where energy loss is minimized while maintaining structural durability.
Solution Approach 2:
The invention employs a composite system of silica filler with specifically selected polymers (polymer B and polymer C) that have different glass transition temperatures and functional groups. This composite approach enables the filler to provide both low rolling resistance and high abrasion resistance through synergistic material interactions.
3Loss of energy
If the amount of filler such as carbon black and silica is reduced or carbon black having a large particle diameter is used, then rolling resistance is reduced, but wet grip property deteriorates
Solution Approach 1:
The invention optimizes the particle size parameter of silica filler to 0.5-2.0 μm and controls the filler content within optimal limits, achieving both low rolling resistance and excellent wet grip property. This parameter optimization resolves the contradiction by finding the sweet spot where energy loss is minimized while maintaining reliable wet surface adhesion.
Solution Approach 2:
The invention uses a composite filler system combining silica with specifically selected polymers (polymer B and polymer C) that have different glass transition temperatures and functional groups. This composite approach allows the filler to provide both low rolling resistance and reliable wet grip property through synergistic interactions between different materials.
4Loss of energy
If polymer compositions are optimized for low loss property, then rolling resistance is reduced, but wet grip performance and mechanical properties become insufficient
Solution Approach 1:
The invention changes the glass transition temperature parameters of the polymer components, using polymer B with Tg of -110°C or lower and polymer C with Tg of -50°C or lower. This parameter optimization allows the composition to achieve both low loss property and excellent wet grip performance by ensuring adequate polymer flexibility and adhesion at operating temperatures.
Solution Approach 2:
The invention employs a composite polymer system consisting of polymer B and polymer C with different glass transition temperatures and functional groups. This composite approach enables the composition to provide both low rolling resistance and excellent wet grip performance through the synergistic effects of polymers with different thermal and mechanical properties.
5Loss of energy
If polymer compositions are optimized for low loss property, then rolling resistance is reduced, but mechanical properties deteriorate
Solution Approach 1:
The invention optimizes the glass transition temperature parameters of the polymer components, using polymer B with Tg of -110°C or lower and polymer C with Tg of -50°C or lower, while controlling their respective content ratios. This parameter optimization achieves both low loss property and adequate mechanical properties by balancing polymer flexibility and structural integrity.
Solution Approach 2:
The invention uses a composite polymer system consisting of polymer B and polymer C with different glass transition temperatures and functional groups. This composite approach allows the composition to provide both low rolling resistance and adequate mechanical properties through the synergistic effects of polymers with different thermal and mechanical characteristics.
Data Source
Figure 1~2
AI summary
A polymer composition including: a filler (A); a polymer (B) having a repeating unit derived from a conjugated diene compound, having a peak temperature of a tanδ temperature dispersion curve of-110°C or more and less than -30°C, and having a functional group capable of interacting with the filler (A); and a polymer (C) having a repeating unit derived from a conjugated diene compound and a repeating unit derived from an aromatic vinyl compound, having a peak temperature of a tanδ temperature dispersion curve of -30°C or more and 10°C or less, and having a functional group capable of interacting with the filler (A), wherein the polymer (B) and the polymer (C) are incompatible with each other, and a concentration of functional groups per unit mass of the polymer (B) is higher than a concentration of functional groups per unit mass of the polymer (C).