Tread Rubber Composition with Optimized Aluminum Hydroxide Particle Size
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Solution Overview
Problem
Pneumatic tire tread rubber compositions that incorporate high amounts of aluminum hydroxide face a trade-off between improved wet grip performance and compromised abrasion resistance, particularly in terms of surface wear patterns.
Innovation Solution
A rubber composition for tire treads is developed, incorporating diene-based rubber with aluminum hydroxide particles of specific average particle diameters (0.6 to 1.3 µm) and distributions, along with silica, to enhance both wet grip and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of aluminum hydroxide is blended into a tread rubber, then wet grip performance is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the average particle diameter (D50) of aluminum hydroxide to 0.6 to 1.3 μm and specifying the particle size distribution (containing 10% by mass or more of particles with diameter not less than 3.0 μm). This optimization of particle size parameters enables the aluminum hydroxide to improve wet grip performance while maintaining abrasion resistance, resolving the technical contradiction between these two properties.
2Reliability
If aluminum hydroxide with optimized particle size is used, then wet grip performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent establishes specific parameter ranges for aluminum hydroxide particle size (D50: 0.6 to 1.3 μm, with 10% by mass or more of particles ≥3.0 μm) that balance performance improvement with manufacturing feasibility. These defined parameters provide clear manufacturing targets while achieving the desired wet grip performance enhancement.
Data Source
AI summary
Provided are: a rubber composition, for a tread, that has improved wet grip performance and abrasion resistance; and a pneumatic tire having a tread formed from the rubber composition for a tread. The rubber composition for a tread contains diene-based rubber and aluminum hydroxide having an average particle diameter (D50) of 0.6 to 1.3 µm and containing 10% by mass or greater of particles having a particle diameter not less than 3.0 µm.