TFE-PPVE Copolymer Composition for Wear-Resistant Chemical Pipes
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Solution Overview
Problem
Existing fluorothermoplasts derived from tetrafluoroethylene and perfluorinated olefins face challenges in providing adequate abrasion resistance, chemical solution permeability, high-temperature rigidity, and durability under repetitive loads and tensile forces, especially in large-diameter pipes used for chemical solution transfer, where wear and deformation are significant issues.
Innovation Solution
A copolymer comprising tetrafluoroethylene and perfluoro(propyl vinyl ether) units, with a specific content range of 4.3 to 6.0% by mass, a melt flow rate of 0.7 to 1.4 g/10 min, and 20 or less functional groups per 10^6 main-chain carbon atoms, which can be processed using conventional methods to form articles with enhanced mechanical and chemical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorothermoplast is used for large-diameter pipes, then chemical solution transfer capability is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of the copolymer: perfluoro(propyl vinyl ether) unit content at 4.3 to 6.0% by mass, melt flow rate at 0.7 to 1.4 g/10 min, and functional groups at 20 or less per 10^6 main-chain carbon atoms. These parameter optimizations resolve the contradiction by achieving both chemical solution transfer capability and abrasion resistance simultaneously.
2Reliability
If fluorothermoplast is used for chemical solution transfer, then chemical resistance is improved, but high-temperature rigidity deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the copolymer composition within specific ranges: perfluoro(propyl vinyl ether) unit content of 4.3 to 6.0% by mass and functional groups of 20 or less per 10^6 main-chain carbon atoms. These controlled parameters enable the material to maintain both chemical resistance and high-temperature rigidity at 85°C.
3Reliability
If fluorothermoplast is used for pipe applications, then durability against chemical solutions is improved, but durability against repetitive load and tensile force deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the melt flow rate at 0.7 to 1.4 g/10 min and the functional group content at 20 or less per 10^6 main-chain carbon atoms. These parameter optimizations enable the copolymer to simultaneously achieve durability against chemical solutions and durability against repetitive load and tensile force at 230°C.
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 4.3 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.7 to 1.4 g/10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.