Tire Rubber Composition Using Aromatic Copolymer for High-Speed Grip
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Solution Overview
Problem
Conventional tire rubber compositions for racing tires face challenges in maintaining dry grip performance and wear resistance during high-speed running, as they tend to degrade due to heat, leading to reduced grip and potential blowouts.
Innovation Solution
A tire rubber composition is developed, comprising 40 to 180 parts by weight of carbon black with a nitrogen adsorption specific surface area of 80 to 400 m2/g and 1 to 100 parts by weight of an aromatic copolymer of an α-methylstyrene derivative and indene, blended in 100 parts by weight of diene rubber, which enhances dry grip performance while retaining sustainability and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large quantity of carbon black fine particles or styrene-butadiene rubber with high glass transition temperature is blended into the rubber composition, then dry grip performance is improved, but modulus and rubber strength decrease in high-temperature state
Solution Approach 1:
The invention changes the chemical composition parameters of the rubber blend by introducing a specific copolymer (α-methylstyrene derivative and indene) with controlled proportions. This copolymer has a glass transition temperature of -80°C to -50°C and specific chemical structure that provides both low-temperature grip and high-temperature stability, resolving the contradiction between initial grip and sustained performance
Solution Approach 2:
The invention creates a composite rubber material combining diene rubber, styrene-butadiene rubber, and the specific copolymer in defined ratios. This composite structure leverages the complementary properties of each component: the copolymer provides thermal stability and sustained grip, while the other rubbers contribute to initial grip performance, achieving both improved grip and maintained strength at high temperatures
2Duration of action of moving object
If high-speed running continues for a long duration, then wear resistance decreases and dry grip performance gradually decreases due to heat sag
Solution Approach 1:
The invention modifies the thermal parameters of the rubber composition by incorporating the copolymer with specific glass transition temperature range (-80°C to -50°C) and chemical structure. This prevents heat sag during prolonged high-speed running, maintaining both wear resistance and grip performance throughout extended duration operation
3Strength
If conventional rubber composition is used, then initial grip performance is achieved, but grip performance sustainability deteriorates during running
Solution Approach 1:
The invention changes the chemical composition by adding the specific copolymer (α-methylstyrene derivative and indene) with controlled glass transition temperature and molecular structure. This copolymer maintains its physical properties across a wide temperature range, ensuring grip performance sustainability from initial contact through extended running duration
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 significantly improves dry grip performance and maintains grip performance sustainability and wear resistance beyond conventional levels, even at high temperatures, making it suitable for high-speed racing tires.
Implementation Method 1
carbon black having a nitrogen adsorption specific surface area of 80 to 400 m2/g
Data Source
AI summary
A tire rubber composition that improves dry grip performance to or beyond conventional levels, while retaining grip performance sustainability and wear resistance during high-speed running is provided. A tire rubber composition comprising 40 to 180 parts by weight of carbon black having a nitrogen adsorption specific surface area of 80 to 400 m2/g and 1 to 100 parts by weight of aromatic copolymer blended in 100 parts by weight of diene rubber, the aromatic copolymer being a copolymer of an α-methylstyrene derivative represented by general formula (I) and indene.