Fluoropolymer Copolymer Composition for Stable High-Temperature Extrusion
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Solution Overview
Problem
Existing copolymers used in forming piping and coatings for high-temperature applications face challenges such as deformation during extrusion, poor abrasion resistance, and chemical solution permeability, especially when dealing with large diameter pipes and wires.
Innovation Solution
A copolymer containing a tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, with a specific range of perfluoro(propyl vinyl ether) content, melt flow rate, and functional groups, which enhances formability, abrasion resistance, nitrogen and chemical solution low permeability, and high-temperature tensile creep properties, allowing for stable extrusion and uniform coating formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing copolymers are used for high-temperature applications, then they can provide basic formability, but they deform during extrusion and show poor abrasion resistance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the perfluoro(propyl vinyl ether) unit content within 2.14 to 2.75 mol%, melt flow rate within 3.0 to 4.2 g/10 min at 372°C, and functional groups to 20 or less per 10^6 main-chain carbon atoms. This optimization of physical and chemical parameters resolves the contradiction by achieving both dimensional stability during extrusion and superior abrasion resistance at high temperatures.
2Ease of manufacture
If copolymer composition is adjusted to improve formability, then extrusion becomes easier, but chemical solution permeability increases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the perfluoro(propyl vinyl ether) unit content to 2.14-2.75 mol% and controlling the melt flow rate to 3.0-4.2 g/10 min. This specific parameter range achieves both excellent formability for extrusion processing and low chemical solution permeability, preventing harmful chemical penetration while maintaining manufacturing ease.
3Volume of moving object
If copolymer is used for large diameter wire coating, then thick coating layers are needed, but uniform thickness is difficult to achieve
Solution Approach 1:
The patent applies parameter changes by controlling the melt flow rate to 3.0-4.2 g/10 min at 372°C and perfluoro(propyl vinyl ether) unit content to 2.14-2.75 mol%. These parameter optimizations enable the copolymer to form thick coating layers on large diameter wires with uniform thickness, achieving both increased coating volume and manufacturing precision.
4Manufacturing precision
If copolymer stability in melt state is improved, then dimensional accuracy increases, but processing becomes more difficult
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the melt flow rate to 3.0-4.2 g/10 min at 372°C and controlling functional groups to 20 or less per 10^6 main-chain carbon atoms. This parameter optimization achieves high dimensional accuracy through improved melt stability while maintaining ease of processing during extrusion.
Data Source
AI summary
There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 2.14 to 2.75 mol % with respect to the whole of the monomer units, a melt flow rate at 372° C. of 3.0 to 4.2 g/10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.