Heat-Resistant Electric Wire Resin Composition
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Solution Overview
Problem
Conventional heat-resistant low-voltage automotive cables require expensive electron beam irradiation for sufficient heat resistance, resulting in low productivity and poor impact resistance, and polyphenylene ether-based non-crosslinked electric wires have low tensile elongation and thermal aging resistance.
Innovation Solution
A resin composition for heat-resistant electric wires is developed, comprising 25-60 parts of polyphenylene ether, 15-42 parts of polypropylene-based resin, 8-27 parts of styrene-based elastomer, 5-15 parts of polyamide with a melting point of 201°C or more, and 1-10 parts of acid-modified polyolefin, which eliminates the need for electron beam irradiation and enhances thermal aging resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electron beam irradiation crosslinking treatment is performed after extrusion molding, then heat resistance is improved, but productivity deteriorates due to additional processing steps and equipment requirements
Solution Approach 1:
The invention changes the chemical composition parameters of the resin blend, specifically formulating a polyphenylene ether-based composition with polypropylene (30-70 wt%) and styrene-based elastomer (70-40 wt%). This parameter change in composition enables the material to achieve sufficient heat resistance (maintaining mechanical properties at 100°C) without requiring crosslinking treatment, thus eliminating the electron beam irradiation step and improving productivity
Solution Approach 2:
The invention uses a composite material system combining polyphenylene ether, polypropylene, and styrene-based elastomer in specific ratios. This composite formulation synergistically provides heat resistance from polyphenylene ether while polypropylene and elastomer improve processability and impact resistance, respectively, eliminating the need for crosslinking and enabling direct use in extrusion molding
2Temperature
If polyphenylene ether is blended in large amounts to satisfy high-temperature melt resistance, then heat resistance is improved, but impact resistance deteriorates
Solution Approach 1:
The invention optimizes the composition parameters by limiting polyphenylene ether to 70 wt% or less and polypropylene to 30 wt% or more. This parameter optimization ensures sufficient heat resistance while the high polypropylene content (which has good impact resistance) compensates for the brittleness of polyphenylene ether, achieving a balance between heat resistance and impact resistance without crosslinking
3Temperature
If polyphenylene ether is blended in large amounts to satisfy high-temperature melt resistance, then heat resistance is improved, but molding processability deteriorates
Solution Approach 1:
The invention changes the composition parameters by incorporating 30 wt% or more polypropylene, which has excellent molding processability and low melt viscosity. This parameter change in composition enables easier extrusion molding and processing while maintaining high-temperature melt resistance through the polyphenylene ether component, achieving both heat resistance and processability without crosslinking
Data Source
AI summary
The present invention provides: a resin composition for a heat-resistant electric wire, containing from 25 to 60 parts by weight of a polyphenylene ether, from 15 to 42 parts by weight of a polypropylene-based resin, from 8 to 27 parts by weight of a styrene-based elastomer, from 5 to 15 parts by weight of a polyamide, and from 1 to 10 parts by weight of an acid-modified polyolefin, in which the polyamide has a melting point of 201° C. or more; and a heat-resistant electric wire using the composition.