Tire Tread Rubber Composition for Early Abrasion Resistance
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Solution Overview
Problem
Tire treads experience early abrasion when subjected to large forces over a long period, despite conventional methods to suppress it, indicating a need for improved abrasion resistance.
Innovation Solution
A tire rubber composition is developed with specific ratios of isoprene-based rubber, styrene-butadiene rubber, silica, resin, and liquid rubber, where the amounts satisfy certain inequalities to enhance abrasion resistance, including a silica content greater than 50 parts by mass, and a resin or liquid rubber content that optimizes energy loss and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica content is increased to improve abrasion resistance, then tread durability is improved, but compound complexity increases
Solution Approach 1:
The invention optimizes the silica content parameter within a specific range (50-150 parts by mass per 100 parts rubber component) and defines precise ratios for other components. This parameter optimization achieves the desired tread durability while managing compound complexity by establishing clear compositional boundaries and relationships between ingredients, making the formulation systematic rather than arbitrary.
2Reliability
If plasticizing agent amount is optimized to suppress early abrasion, then abrasion resistance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention defines specific ranges for plasticizing agent content (3-20 parts by mass per 100 parts rubber component) and establishes precise ratio relationships between all components. This parameter specification achieves improved abrasion resistance while managing manufacturing precision requirements by providing clear target ranges that balance performance optimization with practical manufacturability.
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 effectively suppresses early abrasion and improves abrasion resistance under conditions of high force over time, particularly in heavy-duty tires, by increasing the energy loss at crack tips and reducing stress concentration through silica reinforcement.
Implementation Method 1
increasing the energy loss at crack tips
Implementation Method 2
reducing stress concentration through silica reinforcement
Data Source
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AI summary
It is an object of the present invention to provide a rubber composition for tire that can suppress early abrasion and improve abrasion resistance under the condition that a large force is applied to a tire for a long time and a tire comprising a tread composed of the rubber composition for tire. Provided is a rubber composition for tire comprising a rubber component that comprises an isoprene-based rubber and a styrene-butadiene rubber, silica whose content based on 100 parts by mass of the rubber component is greater than 50 parts by mass, and a plasticizing agent that comprises at least one of a resin and a liquid rubber, wherein, when an amount (% by mass) of the isoprene-based rubber in the rubber component is defined as A, an amount (% by mass) of the styrene-butadiene rubber in the rubber component is defined as B, an amount (part by mass) of the silica based on 100 parts by mass of the rubber component is defined as C, an amount (part by mass) of the resin and the liquid rubber based on 100 parts by mass of the rubber component is defined as D, and an amount (part by mass) of the plasticizing agent based on 100 parts by mass of the rubber component is defined as E, the A, B, C, D, and E satisfy the following inequalities (1), (2), and (3). A/B>3.0 B/D<3.0 C/E>4.0