Fluorinated Copolymer Composition for Thick Wire Coating Durability
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Solution Overview
Problem
Conventional fluorine-containing copolymers are insufficient in ozone resistance and cannot form uniform thick coatings on large-diameter core wires, deform in melt states, and fail to provide adequate abrasion, solvent crack, ozone, and nitrogen permeation resistance, as well as durability to repeated loads.
Innovation Solution
A fluorine-containing copolymer comprising tetrafluoroethylene, hexafluoropropylene, and fluoro(alkyl vinyl ether units, with specific content ratios and melt flow rates, allowing for uniform thick coatings and high forming speed into thin films, while maintaining resistance to abrasion, solvent cracks, ozone, and nitrogen permeation, and resisting fluorine ion dissolution in chemical solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated ethylene propylene resin is used for molding, then heat resistance and chemical inertness are improved, but affinity with ink or varnish deteriorates
Solution Approach 1:
The patent uses a fluorinated copolymer resin comprising a fluorinated vinylidene polymer component and a fluorinated vinyl polymer component. This composite material structure combines the heat resistance of fluorinated ethylene propylene resin with improved surface properties that enhance ink and varnish affinity, resolving the contradiction between thermal stability and manufacturing ease.
Solution Approach 2:
The patent specifies precise compositional parameters: the fluorinated vinylidene polymer component contains 6-40 mol% of a specific fluorinated vinylidene monomer, and the copolymer has a weight average molecular weight of 50,000-500,000 with a polydispersity index of 2.0-5.0. These parameter optimizations adjust the molecular structure to balance heat resistance with surface affinity for better ink and varnish adhesion.
2Reliability
If conventional fluorinated resins are used, then chemical inertness is improved, but printability and coloring properties deteriorate
Solution Approach 1:
The patent employs a composite fluorinated copolymer system combining vinylidene and vinyl polymer components with specific functional groups. This composite structure maintains the chemical inertness characteristic of fluorinated resins while introducing surface properties that improve printability and coloring, allowing conventional printing methods to be effectively applied.
Solution Approach 2:
The patent creates local quality differentiation within the resin structure by incorporating specific fluorinated monomers at controlled concentrations (6-40 mol%). This allows the bulk material to maintain chemical inertness while the surface exhibits improved printability and coloring properties, enabling localized optimization of different functional requirements.
Data Source
AI summary
There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and a fluoro(alkyl vinyl ether) unit, wherein the copolymer has a content of the hexafluoropropylene unit of 7.5 to 10.3% by mass with respect to the whole of the monomer units, a content of the fluoro(alkyl vinyl ether) unit of 0.8 to 2.9% by mass with respect to the whole of the monomer units, a melt flow rate at 372°C of 0.7 to 9.5 g/10 min, and a number of functional groups of 90 or less per 106 main-chain carbon atoms.