Rubber Composition for Tires with Optimized Iodine Value
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Solution Overview
Problem
Conventional rubber compositions for tires face challenges in achieving a balance between on-snow performance, abrasion resistance, and crack resistance, particularly due to poor compatibility between rubber-like polymers and natural rubber, leading to phase separation and reduced crack resistance.
Innovation Solution
A rubber composition is developed with specific specifications, including a rubber-like polymer with an iodine value of 10 to 200, a content of ethylene structure of 3% or more, and a silica-based inorganic filler, which improves compatibility and crack resistance while maintaining on-snow performance and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of filler is reduced or the amount of oil is increased to reduce elastic modulus and improve snow performance, then on-snow performance is improved, but abrasion resistance is lowered
Solution Approach 1:
The patent changes the chemical parameters of the rubber-like polymer by controlling the iodine value (10-200) and ethylene structure content (3-90 mass%), which modifies the polymer's compatibility characteristics and enables simultaneous achievement of low elastic modulus and high abrasion resistance
Solution Approach 2:
The patent creates a composite rubber composition by combining rubber-like polymer with specific natural rubber content (10-90 parts by mass per 100 parts of rubber component) and silica-based filler (60-120 parts by mass), where the natural rubber acts as a compatibility enhancer that prevents phase separation while maintaining both snow performance and abrasion resistance
2Strength
If a rubber-like polymer with crosslinkable unsaturated group is added to increase mechanical strength and abrasion resistance, then abrasion resistance is improved, but phase separation occurs due to poor compatibility with natural rubber, leading to reduced crack resistance
Solution Approach 1:
The patent optimizes the iodine value parameter of the rubber-like polymer (10-200) to control the degree of unsaturation and crosslinking capability, balancing abrasion resistance improvement with compatibility maintenance to prevent phase separation
Solution Approach 2:
The patent ensures homogeneous mixing and compatibility between rubber-like polymer and natural rubber by controlling the natural rubber content (10-90 parts by mass per 100 parts of rubber component) and using silica-based filler as a dispersing medium, preventing phase separation and maintaining crack resistance
Data Source
AI summary
An object of the present invention is to provide a rubber composition from which a tire excellent in on-snow performance and abrasion resistance, and also excellent in crack resistance can be obtained. The rubber composition contains 10 parts by mass or more and 90 parts by mass or less of a rubber-like polymer having an iodine value of 10 to 200, a content of an ethylene structure of 3% by mass or more, a content of an aromatic vinyl monomer block of less than 10% by mass, and a content of a conjugated diene monomer unit of 2% by mass or more; 10 parts by mass or more and 90 parts by mass or less of a natural rubber, wherein a total amount of a rubber component including the rubber-like polymer and the natural rubber is 100 parts by mass; and 60 parts by mass or more and 120 parts by mass or less of a silica-based inorganic filler.