Fluoropolymer Copolymer Composition for Accurate Transparent Pipe Extrusion
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Solution Overview
Problem
Existing copolymers struggle to maintain high dimensional accuracy and transparency in large-diameter pipes while providing excellent high-temperature pressure resistance, abrasion resistance, carbon dioxide and chemical solution low permeability, and preventing fluorine ion dissolution in chemical solutions.
Innovation Solution
A copolymer with a specific composition of tetrafluoroethylene and perfluoro(propyl vinyl ether) units, controlled melt flow rate, and limited functional groups, ensuring minimal deformation in the molten state and enhanced properties like transparency, high-temperature resistance, and low permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the copolymer has high melt flow rate to improve processability, then extrusion forming becomes easier, but dimensional accuracy of large-diameter pipes deteriorates due to deformation in molten state
Solution Approach 1:
The patent optimizes the melt flow rate to a specific range (0.7-1.4 g/10 min at 372°C) and controls the perfluoro(alkyl vinyl ether) unit content (4.5-6.6% by mass) to achieve the right balance between processability and dimensional stability during extrusion forming
Solution Approach 2:
The patent reduces unstable terminal groups to 20 or less per 1×10^6 repeating units, which prevents excessive chain mobility and deformation before the material solidifies, thereby maintaining dimensional accuracy during the forming process
2Reliability
If the perfluoro(alkyl vinyl ether) unit content is increased to improve transparency and abrasion resistance, then surface properties improve, but melt flow rate increases causing deformation
Solution Approach 1:
The patent precisely controls the perfluoro(alkyl vinyl ether) unit content within 4.5-6.6% by mass and melt flow rate within 0.7-1.4 g/10 min to achieve the optimal balance between transparency, abrasion resistance, and dimensional stability
Solution Approach 2:
The patent references prior art (Japanese Patent Laid-Open No. 2009-042478) that established the foundation for this composition range, building upon previous research to refine the parameters for better overall performance
3Temperature
If the copolymer composition is optimized for high-temperature pressure resistance, then thermal stability improves, but processability and extrusion forming become difficult
Solution Approach 1:
The patent optimizes the perfluoro(alkyl vinyl ether) unit content (4.5-6.6% by mass) and melt flow rate (0.7-1.4 g/10 min at 372°C) to achieve both high-temperature pressure resistance and good extrusion formability
Solution Approach 2:
The patent introduces perfluoro(alkyl vinyl ether) units at specific concentrations to provide localized thermal stability enhancement while maintaining the overall processability of the copolymer matrix
4Manufacturing precision
If unstable terminal groups are reduced to improve dimensional accuracy, then manufacturing precision improves, but the copolymer may become more difficult to process
Solution Approach 1:
The patent reduces unstable terminal groups to 20 or less per 1×10^6 repeating units to prevent excessive chain mobility and deformation during processing, while carefully balancing this with the melt flow rate to maintain adequate processability
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 2.7 to 4.9% 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.