Fluoropolymer Composition for Smooth Thin Wire Coating Extrusion
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Solution Overview
Problem
Existing materials for microtubes and electric wire coatings face challenges with heat resistance, chemical resistance, abrasion resistance, carbon dioxide permeability, and surface smoothness, particularly when exposed to high temperatures and chemical reactivity, and struggle to form thin coatings on small-diameter core wires efficiently.
Innovation Solution
A copolymer composed of tetrafluoroethylene (TFE) and perfluoro(propyl vinyl ether) (PPVE) units with specific content ratios and melt flow rates, optimized for injection molding and extrusion forming, which enhances the mechanical properties and reduces permeability, allowing for high productivity and improved performance in heat resistance, chemical resistance, and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing materials are used for microtubes and electric wire coatings, then basic coating and molding functions are achieved, but heat resistance, chemical resistance, abrasion resistance, and surface smoothness deteriorate under high temperature and chemical exposure conditions
Solution Approach 1:
The patent employs a copolymer composite material consisting of tetrafluoroethylene (TFE) units and perfluoro(alkyl vinyl ether) (PAVE) units with specific compositional ratios. This composite structure combines the heat resistance of TFE with the chemical resistance and surface properties of PAVE, achieving simultaneous improvement in heat resistance, chemical resistance, and surface smoothness that neither component could achieve alone.
Solution Approach 2:
The patent optimizes specific parameters including the PAVE unit content (0.1-10 mass%), melt flow rate (2-50 g/10min at 372°C), and functional group concentration (50 or fewer per 10^6 main-chain carbon atoms). By precisely controlling these parameters, the material achieves optimal balance between processability and performance under high temperature and chemical exposure conditions.
2Volume of moving object
If thin coatings are formed on small-diameter core wires by extrusion forming, then coating thickness is reduced, but coating rate and productivity deteriorate
Solution Approach 1:
The patent optimizes the melt flow rate parameter to 2-50 g/10min at 372°C, which enables the molten resin to flow rapidly and uniformly onto small-diameter core wires during extrusion forming. This parameter optimization allows thin coatings to be formed at high speeds without sacrificing coating quality or productivity.
Solution Approach 2:
The copolymer composition with PAVE units provides both excellent processability for high-speed extrusion coating and superior performance properties including chemical resistance, heat resistance, and surface smoothness. This multi-functional material satisfies both thin coating formation requirements and high productivity demands simultaneously.
3Productivity
If injection molding is performed to produce formed articles, then manufacturing efficiency is improved, but surface smoothness deteriorates
Solution Approach 1:
The patent optimizes the melt flow rate to 2-50 g/10min at 372°C and controls the PAVE unit content at 0.1-10 mass%, which enables the molten resin to flow smoothly and fill mold cavities uniformly during injection molding. These parameter optimizations ensure high surface smoothness in injection-molded articles while maintaining high manufacturing efficiency.
Solution Approach 2:
The copolymer composite of TFE and PAVE units provides inherent surface smoothness properties that are maintained even after injection molding. The PAVE component contributes to surface quality while the TFE component ensures structural integrity, allowing high-speed manufacturing without surface degradation.
4Reliability
If materials with high chemical resistance are used, then resistance to chemical solutions is improved, but permeability to carbon dioxide and chemical solutions deteriorates
Solution Approach 1:
The copolymer structure combines TFE units, which provide excellent chemical resistance and low permeability, with PAVE units (0.1-10 mass%), which enhance chemical resistance while maintaining appropriate permeability characteristics. This composite structure achieves simultaneous optimization of chemical solution resistance and carbon dioxide permeability control.
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 4.6 to 5.2% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 22.0 to 28.0 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.