Tire Tread Rubber Composition Balancing Wet Grip and Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rubber compositions for tires struggle to achieve a well-balanced improvement in wet grip performance, fuel-saving performance, and wear resistance.
Innovation Solution
A rubber composition for tires comprising a rubber component with an isoprene skeleton and styrene-butadiene rubber having a glass transition temperature lower than -40 °C, a partially hydrogenated resin component with a specific SP value difference, and a mass ratio of resin to isoprene skeleton rubber of ≥ 0.5, along with a filler, to enhance dispersibility and interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber composition containing natural rubber by ≥ 70 mass % and thermoplastic resin is used to improve wet grip performance, then wet grip performance is improved, but fuel-saving performance and wear resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber component by specifying precise ranges for natural rubber (70-90 mass %) and styrene-butadiene rubber (10-30 mass %), along with controlling the glass transition temperature of SBR to be -40°C or lower. This parameter optimization resolves the contradiction by achieving wet grip performance through natural rubber while improving fuel-saving performance through the low Tg SBR component.
Solution Approach 2:
The patent creates a composite rubber system combining natural rubber with specifically formulated styrene-butadiene rubber having controlled glass transition temperature and bound styrene content. This composite approach allows the natural rubber to provide wet grip performance while the SBR component contributes to fuel-saving performance, thereby resolving the technical contradiction between these two properties.
2Reliability
If a rubber composition containing natural rubber by ≥ 70 mass % and thermoplastic resin is used to improve wet grip performance, then wet grip performance is improved, but wear resistance deteriorates
Solution Approach 1:
The patent optimizes the composition parameters by specifying natural rubber content at 70-90 mass % and adding styrene-butadiene rubber with controlled properties (bound styrene content 20-40 mass %, glass transition temperature -40°C or lower). This parameter control allows the natural rubber to provide wet grip performance while the SBR component enhances wear resistance, resolving the contradiction between these properties.
3Use of energy by moving object
If resin component content is increased to improve dispersibility and interaction with fillers, then fuel-saving performance and wear resistance are improved, but wet grip performance may deteriorate if not optimized
Solution Approach 1:
The patent specifies the resin component content within the range of 1-20 parts by mass per 100 parts by mass of rubber component, and controls the glass transition temperature of SBR to be -40°C or lower. These parameter optimizations ensure that the resin content is sufficient to improve fuel-saving performance through better filler dispersibility, while maintaining wet grip performance through the low Tg SBR component.
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 satisfactory wet grip, fuel-saving, and high wear resistance in a balanced manner by optimizing the resin content and interaction with fillers, preventing deterioration of performance.
Implementation Method 1
the styrene-butadiene rubber has a glass transition temperature lower than -40°C
Data Source
AI summary
A rubber composition for a tire, comprises a rubber component, a resin component, and a filler, wherein: the rubber component contains a rubber having isoprene skeleton and a styrene-butadiene rubber; the styrene-butadiene rubber has a glass transition temperature lower than -40 °C; a content of the resin component is in the range of ≥ 1 and < 50 parts by mass with respect to 100 parts by mass of the rubber component; the resin component has been at least partially hydrogenated and a difference in SP value between the resin component and the isoprene skeleton rubber is ≤ 1.40 (cal/cm3)1/2; and the rubber composition satisfies the formula shown below: a mass ratio of the resin component/the isoprene skeleton rubber is ≥ 0.5.