Rubber composition, method for manufacturing rubber composition, and tire
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Solution Overview
Problem
Conventional rubber compositions fail to simultaneously improve wet performance and reduce rolling resistance of tires effectively, often compromising one performance for the other, and adding resin to enhance wet performance leads to increased rolling resistance.
Innovation Solution
A rubber composition comprising natural rubber, high-Tg modified styrene-butadiene rubber, and low-Tg modified styrene-butadiene rubber, where both ends of the high-Tg rubber and one end of the low-Tg rubber are modified with alkoxysilane, with a mass ratio of high-Tg to low-Tg rubber greater than 1, along with a filler and resin, optimized through a specific manufacturing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin is added to improve wet performance, then wet performance is improved, but loss tangent increases and rolling resistance increases
Solution Approach 1:
The patent changes the glass transition temperature parameter of the styrene-butadiene rubber by modifying the styrene content (30-70 mass%) and vinyl bond content (5-60%), thereby adjusting the rubber's performance characteristics to achieve both low rolling resistance and improved wet performance without adding resin
Solution Approach 2:
The patent creates a composite rubber composition by combining natural rubber (50-90 parts) with modified styrene-butadiene rubber (10-50 parts), where the modified SBR contains specific functional groups that provide both low loss tangent and improved wet performance, eliminating the need for resin additives
2Reliability
If glass transition temperature is increased by adding high styrene content SBR to improve wet performance, then wet performance is improved, but low rolling resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating regions with different glass transition temperatures within the rubber composition - using a blend of modified SBR with different styrene contents to achieve local optimization where some regions provide wet performance while others maintain low rolling resistance
Solution Approach 2:
The patent optimizes the parameter balance by controlling styrene content (30-70 mass%) and vinyl bond content (5-60%) to achieve a glass transition temperature that simultaneously provides adequate wet performance and maintains low rolling resistance, avoiding excessive Tg increase
3Stability of the object's composition
If filler content is reduced to improve dispersibility, then dispersibility is improved, but reinforcement property deteriorates
Solution Approach 1:
The patent introduces an intermediary substance (modified styrene-butadiene rubber with specific functional groups) that acts as a mediator between filler particles and the rubber matrix, improving filler dispersibility while maintaining reinforcement property through enhanced interfacial interaction
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 achieves improved wet performance and reduced rolling resistance, balancing both properties effectively in a tire, while maintaining reinforcement and processability.
Implementation Method 1
both ends of the high-Tg modified styrene-butadiene rubber have been modified and at least one end thereof has been modified with an alkoxysilane; one end of the low-Tg modified styrene-butadiene rubber has been modified with an alkoxysilane
Data Source
AI summary
A rubber composition, contains a rubber component, a filler, and a resin, wherein: the rubber component contains natural rubber, a high-Tg modified styrene-butadiene rubber, and a low-Tg modified styrene-butadiene rubber having a lower glass transition temperature (Tg) than the high-Tg modified styrene-butadiene rubber; both ends of the high-Tg modified styrene-butadiene rubber have been modified and at least one end thereof has been modified with an alkoxysilane; one end of the low-Tg modified styrene-butadiene rubber has been modified with an alkoxysilane; and a mass ratio of the high-Tg modified styrene-butadiene rubber (high-Tg modified SBR) content with respect to the low-Tg modified styrene-butadiene rubber (low-Tg modified SBR) content, i.e., high-Tg modified SBR content/low-Tg modified SBR content, is larger than 1.