Polyarylene Sulfide Resin Composition for Crack-Resistant Molding
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Solution Overview
Problem
Polyarylene sulfide resins suffer from poor moldability and stress cracking resistance, particularly when used in heat molding and in applications like coating layers on electric wires, leading to cracks upon bending.
Innovation Solution
A resin composition comprising a polyarylene sulfide resin and a fluorine-containing elastomer with a terminal functional group, where the elastomer is dispersed in the resin with a specific volume ratio and particle diameter, and a defined melt viscosity ratio, enhancing stress cracking resistance and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyarylene sulfide resin is used to achieve heat resistance and solvent resistance, then functional properties are improved, but moldability deteriorates and cracks are generated during heat molding
Solution Approach 1:
The invention uses a composite material system consisting of polyarylene sulfide resin as the base material and fluorine-containing elastomer as the additive. This composite structure allows the base resin to provide heat and solvent resistance while the elastomer component improves moldability and prevents cracking during heat molding processes.
Solution Approach 2:
The invention changes the physical and chemical parameters of the resin system by introducing fluorine-containing elastomer with specific molecular weight (10,000-1,000,000) and controlling its content (1-50 parts by mass per 100 parts of polyarylene sulfide resin). This parameter optimization resolves the contradiction between maintaining resin functionality and improving processability.
2Stability of the object's composition
If polyarylene sulfide resin is used to achieve dimensional stability, then structural properties are improved, but stress cracking resistance deteriorates and cracks are generated when bent
Solution Approach 1:
The composite material system combines the dimensional stability of polyarylene sulfide resin with the flexibility and crack resistance of fluorine-containing elastomer. The elastomer acts as a stress-absorbing phase that prevents crack propagation while maintaining the overall dimensional stability provided by the rigid resin matrix.
Solution Approach 2:
The invention introduces local quality changes by dispersing fluorine-containing elastomer particles throughout the polyarylene sulfide resin matrix. This creates regions with different mechanical properties - the resin matrix provides dimensional stability while the elastomer particles provide local flexibility and stress cracking resistance.
3Reliability
If fluorine-containing elastomer is added to improve stress cracking resistance, then reliability is improved, but moldability deteriorates and processing becomes difficult
Solution Approach 1:
The invention optimizes the content parameter of fluorine-containing elastomer to 1-50 parts by mass per 100 parts of polyarylene sulfide resin. This controlled parameter range ensures sufficient stress cracking resistance while preventing excessive elastomer content from degrading moldability and processing characteristics.
Solution Approach 2:
The elastomer is dispersed as fine particles throughout the resin matrix, creating a heterogeneous structure where the elastomer provides stress cracking resistance locally without compromising the overall moldability of the resin system. This local distribution prevents the elastomer from forming continuous phases that would harm processing.
Data Source
AI summary
The present invention provides a resin composition from which a molded body having excellent stress cracking resistance is obtained, the resin composition having excellent moldability, a molded body obtained by molding the resin composition, a composite body having the molded body, and use applications thereof. A resin composition of the present invention comprises a polyarylene sulfide resin A and a fluorine-containing elastomer B having a terminal functional group, in which a volume ratio of the polyarylene sulfide resin A to the fluorine-containing elastomer B is 99:1 to 50:50, the fluorine-containing elastomer B is dispersed in the polyarylene sulfide resin A, and the average dispersed particle diameter of the fluorine-containing elastomer B is less than 10 µm.