Thermoplastic Elastomer Composition for Tire Inner Liners
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Solution Overview
Problem
The existing thermoplastic elastomer compositions used for inner liners in pneumatic tires face challenges in achieving improved fatigue durability.
Innovation Solution
A thermoplastic elastomer composition comprising halogenated poly(isoolefin-co-p-alkylstyrene) rubber, polyamide resin, and an amine with at least one hydroxyl group, which enhances the affinity between the matrix and dispersed phases, thereby improving fatigue durability. The composition includes 100 parts by weight of halogenated poly(isoolefin-co-p-alkylstyrene) rubber, 40 to 120 parts by weight of polyamide resin, and 0.5 to 10 parts by weight of the amine, with specific molecular structures and properties that optimize the interface interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermoplastic elastomer composition is used for inner liners in pneumatic tires, then gas barrier properties are improved, but fatigue durability is insufficient
Solution Approach 1:
The invention changes the chemical parameter of the dispersion aid by selecting an amine with specific structural features (at least one hydroxyl group and total carbon atoms of 15 or more). This parameter change in the dispersion aid's molecular structure enables it to effectively improve the affinity between rubber and polyamide, thereby resolving the fatigue durability issue while maintaining gas barrier properties
Solution Approach 2:
The amine with hydroxyl group acts as an intermediary substance between the rubber dispersion and polyamide matrix. It mediates the interface interaction by forming hydrogen bonds and improving adhesion, which enhances fatigue durability without compromising the gas barrier function of the inner liner
2Adaptability or versatility
If rubber dispersion is added to thermoplastic matrix, then elastomeric properties are improved, but affinity between matrix and dispersed phases is insufficient
Solution Approach 1:
The amine with hydroxyl group serves as a mediator at the interface between rubber dispersion and polyamide matrix. It improves affinity by forming hydrogen bonds with both phases, ensuring stable composition and effective stress transfer, which enhances elastomeric properties while maintaining interfacial stability
Solution Approach 2:
The invention changes the chemical parameters of the dispersion aid by specifying structural features (hydroxyl group presence and carbon atom count). These parameter changes enable the dispersion aid to effectively bridge the rubber-polyamide interface, improving both affinity and elastomeric performance
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 improved affinity between the matrix and dispersed phases leads to enhanced fatigue durability and air barrier properties of the thermoplastic elastomer composition, effectively addressing the limitations of existing compositions.
Implementation Method 1
an amine having at least one hydroxyl group
Implementation Method 2
improves the affinity between the matrix phase and the dispersed phases in the interface therebetween
Data Source
AI summary
In order to improve fatigue durability of a thermoplastic elastomer composition composed of a matrix phase of a thermoplastic resin and dispersed phases of a rubber, the thermoplastic elastomer composition comprises (A) 100 parts by weight of a halogenated poly(isoolefin-co-p-alkylstyrene) rubber, (B) 40 to 120 parts by weight of a polyamide resin, and (C) 0.5 to 10 parts by weight of an amine having at least one hydroxyl group. The amine (C) having at least one hydroxyl group is preferably a compound represented by formula (1):where R1 is a C1-30 alkyl; R2 is —(C2H4O)n—H, where n is an integer of 1 to 30; and R3 is —(C2H4O)m—H, where m is an integer of 1 to 30, a C1-30 alkyl, or hydrogen.