Polyamide 612 Thermoplastic Elastomer for Tire Heat Resistance
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Solution Overview
Problem
Polyamide-based thermoplastic elastomers face challenges in achieving both high heat resistance and hygrothermal aging resistance, with existing compositions either lacking in heat resistance or hygrothermal aging resistance.
Innovation Solution
A polyamide-based thermoplastic elastomer is developed with a hard segment containing polyamide 612 and a soft segment composed of polyether diamine, utilizing a resorcinol-formalin-latex-based adhesive to adhere a rubber member to a resin member, enhancing both heat resistance and hygrothermal aging resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a polyamide-based thermoplastic elastomer is designed to achieve high heat resistance, then heat resistance is improved, but hygrothermal aging resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the thermoplastic elastomer by specifying polyamide 612 as the hard segment and polyether diamine as the soft segment, with controlled weight ratios. This parameter optimization resolves the contradiction by achieving both high heat resistance (melting point ≥160°C) and hygrothermal aging resistance through the specific molecular structure of polyamide 612 combined with polyether diamine.
Solution Approach 2:
The invention creates a composite thermoplastic elastomer system combining two distinct functional components: polyamide 612 hard segments providing heat resistance and polyether diamine soft segments providing hygrothermal aging resistance. This composite approach allows each component to contribute its superior properties, resolving the contradiction between heat resistance and hygrothermal aging resistance.
2Productivity
If conventional thermoplastic resins are used for tire frames, then productivity and ease of molding are improved, but heat resistance and hygrothermal aging resistance deteriorate
Solution Approach 1:
The invention optimizes the molecular weight and composition parameters of the polyamide-based thermoplastic elastomer to maintain good injection moldability while achieving high heat resistance. By controlling the weight ratios of hard and soft segments and selecting specific chemical structures, the material achieves both processing ease and thermal 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 solution provides a tire with superior heat resistance and hygrothermal aging resistance, improving durability and crack resistance while maintaining ease of manufacturing and cost-effectiveness.
Implementation Method 1
the rubber member is adhered to the resin member via a layer formed of a composition containing a resorcinol-formalin-latex-based adhesive
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E
AI summary
A polyamide-based thermoplastic elastomer including a hard segment and a soft segment, wherein the hard segment contains polyamide 612 and the soft segment contains a polyamine.