PPS Resin Composition with High Aspect Ratio Mica
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Solution Overview
Problem
Polyphenylene sulfide (PPS) resin compositions mixed with fibrous fillers face challenges in maintaining heat resistance, flowability, surface smoothness, and lightweight properties, particularly in thin-wall moldability and surface irregularities, which are critical for modern automotive and electronic components.
Innovation Solution
Incorporating mica with an aspect ratio of not less than 80 into the PPS resin composition, along with an amorphous resin and a compatibilizer, to enhance heat resistance and surface smoothness while maintaining flowability and low specific gravity, and forming a metal layer on the molded product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fibrous filler such as glass fibers is mixed with PPS resin to improve rigidity and heat resistance, then heat resistance is improved, but flowability is reduced and thin-wall moldability deteriorates
Solution Approach 1:
The invention changes the particle morphology parameter of the filler from fibrous to plate-like with high aspect ratio (not less than 80). This parameter change allows the filler to improve heat resistance while maintaining better flowability compared to conventional fibrous fillers, resolving the contradiction between heat resistance enhancement and flowability preservation.
Solution Approach 2:
The invention uses a composite material system combining PPS resin with plate-like mica filler having specific aspect ratio characteristics. This composite approach achieves synergistic effects where the plate-like structure provides heat resistance improvement without the severe flowability degradation associated with fibrous fillers.
2Temperature
If fibrous filler is mixed with PPS resin to improve rigidity and heat resistance, then heat resistance is improved, but surface smoothness deteriorates due to filler float and minute irregularities
Solution Approach 1:
The invention changes the filler morphology parameter from fibrous to plate-like with high aspect ratio, which prevents filler float to the surface during molding. This parameter change eliminates the formation of minute irregularities on the molded product surface, thereby maintaining surface smoothness while still improving heat resistance.
3Temperature
If fibrous filler is mixed with PPS resin to improve rigidity and heat resistance, then heat resistance is improved, but anisotropy occurs due to filler orientation
Solution Approach 1:
The invention changes the filler shape parameter from anisotropic fibrous structure to plate-like structure with high aspect ratio. This morphological parameter change reduces filler orientation during molding, thereby minimizing anisotropy in the molded product while maintaining heat resistance improvement.
4Temperature
If mica with relatively small aspect ratios (e.g., 25 or 2) is added to PPS resin, then some properties are improved, but heat resistance is not significantly improved
Solution Approach 1:
The invention changes the critical parameter of mica aspect ratio from small values (25 or 2) to high values (not less than 80). This parameter change enables significant heat resistance improvement with relatively small amounts of mica addition, making the modification both effective and economical.
Data Source
AI summary
An object of the invention is to provide a polyphenylene sulfide resin composition having excellent heat resistance, flowability and lightweight property as well as surface smoothness and impact resistance. There is provided a polyphenylene sulfide resin composition, comprising: 1 to 30 parts by weight of a mica (b) having an aspect ratio of not less than 80, relative to 100 parts by weight of a polyphenylene sulfide resin (a).