Injection-Molded TFE Copolymer Body for Ozone-Resistant Service
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Solution Overview
Problem
Existing ozone-resistant injection molded articles made from perfluororesins with high melt flow rates (MFR) exhibit inferior ozone resistance, leading to premature cracking and degradation, limiting their service life and increasing maintenance costs.
Innovation Solution
An injection molded article composed of a copolymer with a specific composition of tetrafluoroethylene (TFE) and fluoro(alkyl vinyl ether) units, with controlled fluorine ion and metal dissolution, optimized melt flow rate, and melting point, to enhance ozone resistance and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If perfluororesin with high melt flow rate is used to improve processability, then ease of manufacture is improved, but ozone resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the fluoro(alkyl vinyl ether) unit content within 4.7-7.0% by mass and the melt flow rate within 11.0-22.0 g/10 min. This optimization resolves the contradiction by finding the specific parameter range where both processability (adequate MFR) and ozone resistance (controlled fluorine ion dissolution) are simultaneously achieved, rather than simply increasing MFR for easier manufacturing.
Solution Approach 2:
The patent uses composite material principles by creating a copolymer composition that combines tetrafluoroethylene units with fluoro(alkyl vinyl ether) units in specific proportions. This copolymer structure integrates the processing benefits of higher MFR materials while maintaining the chemical stability and ozone resistance of perfluororesins, effectively combining the advantages of both material types.
2Ease of manufacture
If fluoro(alkyl vinyl ether) unit content is increased to improve melt flow rate, then ease of manufacture is improved, but fluorine ion dissolution increases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing the optimal fluoro(alkyl vinyl ether) unit content range of 4.7-7.0% by mass. Within this range, the melt flow rate achieves adequate processability (11.0-22.0 g/10 min) while the fluorine ion dissolution remains controlled (7,500 μg/m2 or lower). This precise parameter control prevents excessive fluorine ion dissolution that would occur with higher FAVE content.
3Strength
If copolymer composition is optimized for mechanical properties, then strength is improved, but ozone resistance may deteriorate
Solution Approach 1:
The patent resolves this contradiction by optimizing multiple parameters simultaneously: the FAVE unit content (4.7-7.0% by mass), melt flow rate (11.0-22.0 g/10 min), and melting point (296-305°C). This multi-parameter optimization ensures that mechanical properties are enhanced through adequate melt flow and molecular structure, while ozone resistance is maintained through controlled fluorine ion dissolution by limiting FAVE content within the specified range.
Data Source
AI summary
Provided is an injection molded article containing a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, wherein the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 4.7 to 7.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 11.0 to 22.0 g/10 min, the melting point of the copolymer is 296 to 305° C., and the amount of fluorine ions dissolving out from the injection molded article into water is 7,500 μg/m2 or lower.