Fluoropolymer Composition for Abrasion-Resistant Ozone-Stable Wire Coating
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Solution Overview
Problem
Existing materials for ozone-resistant articles face challenges in providing excellent abrasion resistance, nitrogen low permeability, chemical solution low permeability, high-temperature rigidity, and long-term ozone resistance while maintaining chemical resistance and heat resistance, with attempts to improve sealability and water vapor low permeability often compromising ozone and abrasion resistance.
Innovation Solution
A copolymer containing tetrafluoroethylene and perfluoro(propyl vinyl ether units, with a specific content range of 3.9 to 4.9% by mass, a melt flow rate of 4.0 to 9.0 g/10 min, and 40 or less functional groups per 10^6 main-chain carbon atoms, enhancing moldability and forming a uniform, thick coating layer on large-diameter core wires with improved resistance to corrosion and fluorine ion dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of perfluoro(propyl vinyl ether) unit is increased to improve sealability and water vapor low permeability, then sealability and water vapor low permeability are improved, but abrasion resistance and ozone resistance deteriorate
Solution Approach 1:
The patent precisely controls the content of perfluoro(propyl vinyl ether) unit within 3.9 to 4.9% by mass, and the melt flow rate within 4.0 to 9.0 g/10 min at 372°C, to achieve the optimal balance between sealability and abrasion resistance. This parameter optimization resolves the contradiction by finding the precise range where both properties are satisfied simultaneously.
2Ease of manufacture
If the melt flow rate is increased to improve moldability, then moldability is improved, but the number of functional groups increases causing metal mold corrosion
Solution Approach 1:
The patent optimizes the melt flow rate to 4.0 to 9.0 g/10 min at 372°C and controls the number of functional groups to 40 or less per 10^6 main-chain carbon atoms. This precise parameter control allows good moldability while minimizing metal mold corrosion by limiting the amount of reactive functional groups.
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 3.9 to 4.9% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 4.0 to 9.0 g/10 min, and the number of functional groups of 40 or less per 106 main-chain carbon atoms.