Fluoropolymer Composition for Methane Permeation and Moisture Barrier
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Solution Overview
Problem
Existing fluorine-containing copolymers fail to provide a balance between air permeability, methane permeability, and low moisture permeability, which is essential for applications like incubators that require light permeation, chemical resistance, and durability.
Innovation Solution
A fluorine-containing copolymer comprising tetrafluoroethylene, hexafluoropropylene, and perfluoro(propyl vinyl ether units, with specific content ratios and melt flow rates, that enhances abrasion resistance, ozone resistance, hot water resistance, methane permeation, and durability, while minimizing fluorine ion dissolution in chemical solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing fluorine-containing copolymers are used, then chemical resistance and durability are provided, but a balance between air permeability, methane permeability, and low moisture permeability cannot be achieved
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of monomer units (HFP: 10.5-11.8%, PPVE: 1.2-1.6%) and processing parameters (melt flow rate: 17.0-40.0 g/10 min at 372°C, injection speed: very high) to achieve the desired balance between permeability and chemical resistance properties
Solution Approach 2:
The patent creates a composite copolymer structure combining three different fluorinated monomer units (tetrafluoroethylene, hexafluoropropylene, and perfluoro(propyl vinyl ether)) to achieve synergistic effects that simultaneously provide chemical resistance, controlled permeability, and durability
2Shape
If injection molding is performed at very high injection speed, then thin-wall and beautiful molded products are produced, but manufacturing precision may be compromised
Solution Approach 1:
The patent changes the melt flow rate parameter to a specific range (17.0-40.0 g/10 min at 372°C) that enables the material to be processed at very high injection speeds while still producing thin-wall molded products with excellent appearance and dimensional precision
3Reliability
If fluorine-containing copolymer is used for chemical resistance, then durability in chemical solutions is improved, but fluorine ion dissolution occurs
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating perfluoro(propyl vinyl ether) units with specific side chain structures and controlling the overall fluorine content and distribution, which reduces fluorine ion dissolution while maintaining chemical resistance and durability
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 10.5 to 11.8% by mass with respect to the whole of the monomer units, a content of the perfluoro(propyl vinyl ether) unit of 1.2 to 1.6% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 17.0 to 40.0 g/10 min, and a total number of —CF2H, carbonyl group-containing terminal groups, —CF═CF2 and —CH2OH of 90 or less per 106 main-chain carbon atoms.