TFE-PPVE Copolymer Composition for Abrasion-Resistant Filter Housings
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Solution Overview
Problem
Conventional copolymers used in filter housings for high-temperature fluids and chemical solutions suffer from deformation, wear, and cracking due to fluid pressure changes and exposure to reactive chemicals, lacking sufficient abrasion resistance, hydrogen permeability, and high-temperature rigidity.
Innovation Solution
A copolymer comprising tetrafluoroethylene (TFE) and perfluoro(propyl vinyl ether) (PPVE) units with a specific content range of 5.5-6.5% PPVE, a melt flow rate of 36.1-49.9 g/10 min, and 50 or fewer functional groups per 10^6 main-chain carbon atoms, enhancing formability and providing excellent abrasion resistance, low hydrogen permeability, and high-temperature durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional copolymers are used in filter housings for high-temperature fluids, then the basic chemical resistance is provided, but the copolymers suffer from deformation, wear, and cracking due to insufficient abrasion resistance and high-temperature rigidity
Solution Approach 1:
The patent applies parameter changes by precisely controlling the PPVE unit content (5.5-6.5% by mass), melt flow rate (36.1-49.9 g/10 min at 372°C), and functional group concentration (50 or fewer per 10^6 main-chain carbon atoms). These parameter optimizations resolve the contradiction by achieving both high abrasion resistance and reliability against deformation/cracking at high temperatures
Solution Approach 2:
The patent uses composite material principles by creating a copolymer system combining TFE and PPVE units with specific compositional ratios. This composite structure at the molecular level provides both the required abrasion resistance and high-temperature structural stability, preventing deformation and cracking
2Temperature
If conventional copolymers are used for high-temperature applications, then basic formability is achieved, but the copolymers lack sufficient high-temperature rigidity at 105°C and tensile creep resistance at 230°C
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the melt flow rate (36.1-49.9 g/10 min at 372°C) which ensures adequate formability during manufacturing, while simultaneously controlling the PPVE unit content (5.5-6.5% by mass) to achieve high-temperature rigidity at 105°C and tensile creep resistance at 230°C
3Productivity
If conventional copolymers are used in injection molding, then basic production is achieved, but the articles lack excellent surface smoothness and durability against repetitive loads and solvent crack resistance
Solution Approach 1:
The patent applies parameter changes by optimizing the melt flow rate (36.1-49.9 g/10 min at 372°C) which enables high productivity in injection molding while simultaneously achieving excellent surface smoothness. The controlled functional group concentration (50 or fewer per 10^6 main-chain carbon atoms) further ensures durability against repetitive loads and solvent crack resistance
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 5.5 to 6.5% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 36.1 to 49.9 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.