Fluorine-containing copolymer
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Solution Overview
Problem
Conventional fluorine-containing copolymers fail to produce articles with high-temperature rigidity and durability when exposed to chemical solutions, lacking the necessary abrasion resistance and tensile creep resistance.
Innovation Solution
A fluorine-containing copolymer comprising tetrafluoroethylene, hexafluoropropylene, and perfluoro(propyl vinyl ether units, with specific content ratios and melt flow rates, enabling the production of articles with enhanced 65° C. abrasion resistance, solvent crack resistance, low hydrogen permeation, high-temperature rigidity, and durability to repeated loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fluorine-containing copolymers are used, then the basic chemical resistance is maintained, but the high-temperature rigidity and abrasion resistance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of the copolymer: hexafluoropropylene content (9.4-10.3 mass%), perfluoro(ethyl vinyl ether) content (0.2-3.0 mass%), and melt flow rate (7.0-17.0 g/10min at 372°C). These parameter optimizations enable the material to achieve both high-temperature rigidity and durability in chemical solutions simultaneously
Solution Approach 2:
The patent creates a composite fluorine-containing copolymer system combining tetrafluoroethylene, hexafluoropropylene, and perfluoro(ethyl vinyl ether) units. This composite structure at the molecular level provides synergistic effects that deliver enhanced mechanical properties including high-temperature rigidity, abrasion resistance, and chemical solution durability that individual polymers cannot achieve alone
2Strength
If the hexafluoropropylene content is increased to improve rigidity, then the high-temperature rigidity improves, but the abrasion resistance deteriorates
Solution Approach 1:
The patent resolves this contradiction through precise parameter optimization, specifying hexafluoropropylene content within the narrow range of 9.4-10.3 mass% and perfluoro(ethyl vinyl ether) content at 0.2-3.0 mass%. This balanced composition achieves both high-temperature rigidity and abrasion resistance without compromising either property
Solution Approach 2:
The patent applies local quality by introducing perfluoro(ethyl vinyl ether) units at specific concentrations (0.2-3.0 mass%) within the copolymer structure. These localized functional units provide abrasion resistance while the overall copolymer structure maintains high-temperature rigidity through the hexafluoropropylene content
3Manufacturing precision
If the melt flow rate is increased to improve formability, then the injection molding quality improves, but the tensile creep resistance deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the melt flow rate parameter to a specific range of 7.0-17.0 g/10min at 372°C. This controlled parameter ensures sufficient flow for high-quality injection molding while maintaining adequate molecular weight and chain entanglement for tensile creep resistance in the final product
Data Source
AI summary
There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the hexafluoropropylene unit of 9.4 to 10.3% by mass with respect to the whole of the monomer units, a content of the perfluoro(propyl vinyl ether) unit of 0.8 to 1.6% by mass with respect to the whole of the monomer units, and a melt flow rate at 372° C. of 7.0 to 17.0 g/10 min.