TFE-PPVE Copolymer Composition for Moldable Low-Permeation Wire Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current tetrafluoroethylene-based copolymers with perfluoro(alkyl vinyl ether) units do not simultaneously achieve excellent moldability, transparency, abrasion resistance, nitrogen low permeability, chemical solution low permeability, long-term ozone resistance, high-temperature rigidity, creep resistance, and water vapor low permeability, which are essential for applications like ozone water valves and electric wire coatings.
Innovation Solution
A copolymer comprising tetrafluoroethylene and perfluoro(propyl vinyl ether) units with a specific content range (4.8-6.2% by mass) and melt flow rate (17.0-23.0 g/10 min) is developed, along with a controlled number of functional groups (50 or less per 10^6 main-chain carbon atoms, to enhance moldability and achieve the desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tetrafluoroethylene-based copolymers with perfluoro(alkyl vinyl ether) units are used, then moldability is improved, but transparency, abrasion resistance, and other properties deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the PPVE unit content within 4.8-6.2% by mass, maintaining melt flow rate at 17.0-23.0 g/10 min, and limiting functional groups to 50 or less per 10^6 main-chain carbon atoms. This optimization of compositional parameters enables the copolymer to achieve both excellent moldability and superior optical, mechanical, and barrier properties that cannot be obtained with conventional copolymers
Solution Approach 2:
The patent creates a composite material system by combining tetrafluoroethylene units with perfluoro(propyl vinyl ether) units in a specific ratio, forming a copolymer structure that integrates the benefits of both monomers while minimizing their drawbacks, resulting in a material that simultaneously achieves processability and high-performance properties
2Productivity
If perfluoro(alkyl vinyl ether) unit content is increased to improve moldability, then flowability improves, but corrosion resistance of metal molds and core wires deteriorates
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the PPVE unit content parameter within 4.8-6.2% by mass and limiting functional groups to 50 or less per 10^6 main-chain carbon atoms. This optimized parameter range provides sufficient flowability for easy molding while minimizing the corrosiveness to metal molds and core wires
3Manufacturing precision
If copolymer composition is adjusted to achieve uniform coating thickness on small diameter core wires, then coating uniformity improves, but moldability and other properties may deteriorate
Solution Approach 1:
The patent achieves this dual benefit by optimizing the PPVE unit content to 4.8-6.2% by mass, which provides the right balance between melt flow rate (17.0-23.0 g/10 min) for good moldability and appropriate viscosity for forming uniform coatings on small diameter core wires
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 4.8 to 6.2% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 17.0 to 23.0 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.