Pneumatic Tire Rubber Interface Crosslinking Without Abrasion Loss
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Solution Overview
Problem
Hydrogenated copolymers exhibit poor adhesiveness with other rubber members due to few crosslinking points and hydrogenated double bonds, leading to separation defects in tire molding, and adjusting vulcanization speed to improve adhesiveness compromises abrasion resistance.
Innovation Solution
A pneumatic tire design incorporating a rubber member A with a hydrogenated copolymer and a rubber member B containing diene rubber, using a triazine-thiol compound and quaternary ammonium salt to enhance crosslinking adhesiveness while maintaining abrasion resistance, with specific molecular weights and hydrogenation rates for the hydrogenated copolymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a peroxide or sulfenamide-based vulcanization accelerator is used to improve adhesiveness of hydrogenated copolymer, then crosslinking adhesiveness is improved, but abrasion resistance is impaired
Solution Approach 1:
The patent changes the chemical parameter of the vulcanization system by introducing a triazine-thiol compound instead of conventional peroxide or sulfenamide accelerators. This specific compound enables crosslinking at lower sulfur content (0.5-3 parts by mass), maintaining adhesiveness while preserving the abrasion resistance of the hydrogenated copolymer.
Solution Approach 2:
The patent creates a composite vulcanization system combining triazine-thiol compound with specific rubber components (hydrogenated copolymer with 80 mol% or more hydrogenation rate, weight average molecular weight 300,000 or more). This composite approach achieves both good adhesiveness and abrasion resistance through synergistic effects.
2Strength
If sulfur content is increased to improve crosslinking adhesiveness, then adhesiveness between rubber members is improved, but abrasion resistance is impaired
Solution Approach 1:
The patent optimizes the sulfur content parameter to a specific range (0.5-3 parts by mass per 100 parts by mass of rubber component) and combines it with triazine-thiol compound. This parameter optimization achieves effective crosslinking without excessive sulfur that would compromise abrasion resistance.
3Strength
If vulcanization speed is adjusted to improve adhesiveness, then crosslinking adhesiveness is improved, but abrasion resistance is impaired
Solution Approach 1:
The patent changes the vulcanization chemistry by using triazine-thiol compound, which provides appropriate vulcanization speed without requiring adjustments that would harm abrasion resistance. The compound enables effective crosslinking at controlled speeds suitable for maintaining rubber material properties.
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 solution achieves excellent crosslinking adhesiveness between rubber members while preserving abrasion resistance, ensuring robust tire performance.
Implementation Method 1
a rubber member A containing a rubber component containing 70 mass % to 100 mass % of a hydrogenated copolymer, sulfur, and a triazine-thiol compound; and a rubber member B containing sulfur and a rubber component containing a diene rubber
Implementation Method 2
The rubber member A may further contain a quaternary ammonium salt, a content of the quaternary ammonium salt may be 0.1 parts by mass or more with respect to 100 parts by mass of the rubber component of the rubber member A
Data Source
AI summary
A pneumatic tire includes: a rubber member A containing a rubber component containing 70 mass % to 100 mass % of a hydrogenated copolymer, sulfur, and a triazine-thiol compound; and a rubber member B containing sulfur and a rubber component containing a diene rubber. The hydrogenated copolymer is obtained by hydrogenating an aromatic vinyl-conjugated diene copolymer, has a weight average molecular weight of 300,000 or more as measured by gel permeation chromatography, and has a hydrogenation rate of a conjugated diene moiety of 80 mol % or more, the rubber member A and the rubber member B are in contact with each other at an interface, and a content of the triazine-thiol compound is 0.1 parts by mass to 5 parts by mass with respect to 100 parts by mass of the rubber component in the rubber member A.