End-Group-Modified SBR Rubber Mixture for Tire Tread
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Solution Overview
Problem
Existing rubber mixtures for vehicle tires face a trade-off between improving wet grip and maintaining or reducing rolling resistance, as enhancements in one characteristic often lead to deterioration in another.
Innovation Solution
A rubber mixture composed of 20-90 phr natural or synthetic polyisoprene, 5-40 phr butadiene rubber, 5-50 phr end-group-modified styrene-butadiene rubber, 0-50 phr additional polar or non-polar rubber, 0-7 phr plasticizer oil, 0.1-20 phr amorphous or precipitated silica, and 30-70 phr carbon black, with the styrene-butadiene rubber having a glass transition temperature between -40°C and 0°C and being end-group-modified with specific functional groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the glass transition temperature of the rubber mixture is reduced to improve abrasion resistance, then abrasion resistance is improved, but wet grip properties deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature within -40°C to 0°C and the vinyl content within 10% to 40% in the styrene-butadiene rubber. This optimized parameter range resolves the contradiction by achieving a balance where abrasion resistance is improved through moderate glass transition temperature reduction, while wet grip is maintained through controlled vinyl content that provides adequate adhesion without excessive softening
Solution Approach 2:
The patent uses composite materials by combining styrene-butadiene rubber with specific glass transition temperature and vinyl content with other rubber components and fillers in a multi-component system. This composite approach allows the mixture to exhibit synergistic properties where the styrene-butadiene rubber provides abrasion resistance while the overall composition maintains wet grip through the combined effects of all components
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 rubber mixture enhances wet grip while maintaining or improving rolling resistance, decoupling the traditional trade-off between these tire properties, and is applicable not only to tire treads but also to other internal tire components and conveyor belts.
Implementation Method 1
the styrene-butadiene copolymers have a glass transition temperature between -40 °C and 0 °C
Implementation Method 2
the desired properties are abrasion, rolling resistance, measured by rebound elasticity
Data Source
AI summary
The invention relates to a rubber mixture, characterized by the following composition: -20 - 90 phr of at least one natural or synthetic polyisoprene, and -5 - 40 phr of at least one butadiene rubber, and -5 - 50 phr of at least one end group-modified styrol butadiene rubber, and - 0 - 50 phr of at least one further polar or non-polar rubber, and - 0 - 7 phr of at least one softening oil, and - 0 - 25 phr of amorphous silica and/or precipitation silica, and -10 - 80 phr of at least one carbon black, and -2 - 100 phr of further additives. The end group-modified styrol butadiene rubber preferably has a glass transition temperature of between -40°C and 0°C.