Fluoropolymer Composition Balancing Rigidity, Creep, and Molding
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Solution Overview
Problem
Current fluorine-containing copolymers fail to provide articles with excellent high-temperature rigidity, creep resistance, abrasion resistance, durability to repeated loads, ductility to tensile force, and chemical solution resistance, while also being suitable for injection molding and extrusion forming.
Innovation Solution
A fluorine-containing copolymer comprising tetrafluoroethylene, hexafluoropropylene, and perfluoro(propyl vinyl ether units, with specific content ratios and melt flow rates, optimized for improved mechanical properties and processing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fluorine-containing copolymers are used, then basic polymer properties are maintained, but high-temperature rigidity, creep resistance, and abrasion resistance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of monomer units (tetrafluoroethylene: 85-95 mass%, hexafluoropropylene: 3-10 mass%, perfluoro(propyl vinyl ether): 0.5-3 mass%) and regulating melt flow rate (5-20 g/10min at 372°C) to achieve optimal balance between high-temperature rigidity and creep resistance
Solution Approach 2:
The patent creates a composite fluoropolymer structure by copolymerizing three different monomer units, each contributing specific properties: tetrafluoroethylene provides base strength, hexafluoropropylene enhances chemical resistance, and perfluoro(propyl vinyl ether) improves processability and thermal properties
2Strength
If polymer composition is optimized for mechanical properties, then high-temperature rigidity improves, but processing performance deteriorates
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including compositional ratios and melt flow rate to achieve the dual goal of improved abrasion resistance and injection molding processability. The melt flow rate control (5-20 g/10min) is particularly critical for balancing mechanical properties with manufacturing ease
3Strength
If polymer composition is optimized for high-temperature performance, then rigidity at 92.5°C improves, but chemical solution resistance deteriorates
Solution Approach 1:
The patent uses a composite structure of three fluoropolymer monomer units where hexafluoropropylene specifically contributes to chemical solution resistance while the overall composition maintains high-temperature rigidity. The synergistic effect of multiple monomer units resolves the contradiction between thermal and chemical performance
4Duration of action of stationary object
If polymer composition is optimized for durability, then repeated load resistance improves, but ductility at elevated temperature deteriorates
Solution Approach 1:
The patent employs parameter changes by precisely controlling the content of each monomer unit and the melt flow rate to achieve the optimal balance between durability under repeated loads and ductility at elevated temperatures. The perfluoro(propyl vinyl ether) content (0.5-3 mass%) is particularly important for maintaining ductility while improving durability
Data Source
AI summary
There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of hexafluoropropylene unit of 8.5 to 9.5% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 1.2 to 1.88 by mass with respect to the whole of the monomer units, a melt flow rate at 372°° C. of 9.0 to 15.0 g/10 min, and a total number of a carbonyl group-containing terminal group, —CF═CF2 and —CH2OH per 106 main-chain carbon atoms of 100 or less.