TFE-PPVE Copolymer Composition for High-Temperature Sealability
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Solution Overview
Problem
Existing fluoropolymers struggle to maintain sealability and heat resistance at high temperatures, particularly in applications like secondary batteries, where they are exposed to temperatures exceeding their glass transition temperature, and also face challenges in forming thin coatings with excellent capacitance stability on small-diameter core wires.
Innovation Solution
A copolymer composed of tetrafluoroethylene (TFE) and perfluoro(propyl vinyl ether) (PPVE) units, with a specific content range of 2.0 to 2.8% PPVE by mass and a melt flow rate of 23 to 30 g/10 min, which enhances glass transition temperature, hardness, and water vapor low permeability, allowing for high productivity in injection molded articles with improved crack resistance, abrasion resistance, and sealability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing fluoropolymers are used, then chemical property and electric property are maintained, but sealability and heat resistance deteriorate at high temperatures exceeding glass transition temperature
Solution Approach 1:
The patent applies parameter changes by precisely controlling the PPVE unit content (2.0-2.8% by mass) and melt flow rate (23-30 g/10 min) to achieve optimal balance between glass transition temperature, hardness, and sealability at high temperatures
Solution Approach 2:
The patent uses composite materials by creating a copolymer combining tetrafluoroethylene units with perfluoro(propyl vinyl ether) units, where the specific composition ratio provides synergistic effects for improved heat resistance and sealability
2Reliability
If thin coatings are formed on small-diameter core wires, then capacitance stability is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent applies parameter changes by optimizing the melt flow rate (23-30 g/10 min) to enable smooth flow and uniform coating on small-diameter core wires, reducing manufacturing difficulty while maintaining capacitance stability
3Productivity
If injection molded articles are produced with high productivity, then surface smoothness is improved, but crack resistance may deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the melt flow rate (23-30 g/10 min) and PPVE unit content (2.0-2.8% by mass) to achieve optimal balance between injection molding efficiency, surface smoothness, and crack resistance
4Reliability
If water vapor low permeability is enhanced, then sealability is improved, but material hardness may increase excessively
Solution Approach 1:
The patent applies parameter changes by precisely adjusting the PPVE unit content (2.0-2.8% by mass) to achieve optimal balance between water vapor low permeability, sealability, and suitable hardness at high temperatures
Data Source
AI summary
A copolymer containing tetrafluoroethylene unit, and a perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of the perfluoro(propyl vinyl ether) unit of 2.0 to 2.8% by mass with respect to the whole of the monomer units, and a melt flow rate of 23 to 30 g/10 min.