Tire Tread Rubber Composition for Wet Grip in Cold Conditions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire rubber compositions face challenges in simultaneously achieving low-temperature performance and wet grip performance, as incorporating butadiene rubber for low-temperature performance tends to deteriorate wet grip, and adding resin for wet grip performance compromises low-temperature performance.
Innovation Solution
A rubber composition for tire treads comprising 100 parts of a diene rubber component with 40 parts or more of modified butadiene rubber, 60 to 200 parts of silica, and 20 to 60 parts of a terpene-based resin with a β-pinene unit content of 40 mass % or more, which improves dispersibility and processability while maintaining both low-temperature and wet grip performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If butadiene rubber is incorporated to improve low-temperature performance, then low-temperature performance is improved, but wet grip performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by specifying a butadiene rubber with specific glass transition temperature (-100°C or lower) and vinyl content (30-80%), combined with precise silica particle size distribution (Dv10, Dv50, Dv90 ratios) and resin content ratios, to simultaneously achieve low-temperature flexibility and wet grip adhesion
Solution Approach 2:
The patent creates a composite material system combining butadiene rubber, silica filler with specific surface area (150-300 m²/g), and resin additives in specific proportions (silica 50-200 parts, resin 5-60 parts per 100 parts rubber) to achieve properties that neither component alone can provide
2Reliability
If resin is added to improve wet grip performance, then wet grip performance is improved, but low-temperature performance deteriorates
Solution Approach 1:
The patent controls the resin content within specific ranges (5-60 parts per 100 parts rubber) and specifies the silica-to-resin ratio (5:1 to 20:1) to balance the glass transition temperature increase from resin with the low Tg butadiene rubber, maintaining low-temperature flexibility while achieving wet grip improvement
Data Source
AI summary
A rubber composition for a tire tread according to an embodiment includes: 100 parts by mass of a diene rubber component containing 40 parts by mass or more of a modified butadiene rubber; 60 to 200 parts by mass of silica; and 20 to 60 parts by mass of a terpene-based resin having a β-pinene unit content of 40 mass % or more.