Fluoropolymer Composition for Injection Molding and Heat Rigidity
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Solution Overview
Problem
Existing fluorine-containing copolymers face challenges in achieving a balance between moldability, high-temperature rigidity, and chemical resistance, particularly in injection molding, where they often deflect at high temperatures and lack durability for applications like flowmeter members.
Innovation Solution
A fluorine-containing copolymer comprising tetrafluoroethylene, hexafluoropropylene, and perfluoro(propyl vinyl ether units, with specific content ranges of 8.0-9.4% HFP, 0.6-1.5% PPVE, and a melt flow rate of 6.8-9.9 g/10 min, which improves moldability and enhances properties such as 85°C abrasion resistance, 97.5°C high-temperature rigidity, and chemical solution resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fluorine-containing copolymers are used for injection molding, then moldability is achieved, but high-temperature rigidity deteriorates causing deflection at high temperatures
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of monomer units (HFP: 8.0-9.4 mass%, PPVE: 0.6-1.5 mass%) and processing parameters (melt flow rate: 6.8-9.9 g/10min at 372°C). This optimization resolves the contradiction by achieving both good moldability through appropriate flow characteristics and high-temperature rigidity through controlled crystallinity and molecular structure.
Solution Approach 2:
The patent creates a composite fluoropolymer system by copolymerizing multiple monomer units (tetrafluoroethylene, hexafluoropropylene, and perfluoro(propyl vinyl ether)) in specific ratios. This composite approach allows combining the benefits of different monomer units: TFE provides chemical resistance, HFP enhances rigidity and heat resistance, and PPVE improves moldability and flexibility, thereby resolving the contradiction between moldability and high-temperature rigidity.
2Strength
If fluorine-containing copolymer composition is optimized for rigidity, then high-temperature rigidity improves, but moldability deteriorates
Solution Approach 1:
The patent resolves this contradiction through precise parameter optimization, specifically controlling the melt flow rate at 6.8-9.9 g/10min (measured at 372°C with 5kg load). This parameter range ensures the polymer has sufficient flowability for injection molding while maintaining the compositional structure needed for high-temperature rigidity. The balanced composition (HFP: 8.0-9.4 mass%, PPVE: 0.6-1.5 mass%) further supports both requirements simultaneously.
3Reliability
If conventional copolymer composition is used, then general chemical resistance is achieved, but durability to repeated loads and creep resistance deteriorates
Solution Approach 1:
The patent applies composite material principles by formulating a multi-component fluoropolymer system where each monomer unit contributes specific properties. The combination of TFE (providing chemical resistance), HFP (enhancing mechanical strength and creep resistance), and PPVE (improving flexibility and durability) creates a synergistic effect that simultaneously achieves excellent chemical resistance and superior durability to repeated loads and creep resistance.
Solution Approach 2:
The patent uses parameter changes by optimizing the compositional ratios (HFP: 8.0-9.4 mass%, PPVE: 0.6-1.5 mass%) to achieve the desired balance between chemical resistance and mechanical durability. This precise compositional control ensures the polymer maintains its chemical resistance while developing the molecular structure necessary for long-term mechanical durability under repeated loading conditions.
4Productivity
If fluorine-containing copolymer is molded by injection molding, then production efficiency improves, but article quality deteriorates due to deflection and poor finish
Solution Approach 1:
The patent resolves this contradiction through comprehensive parameter optimization, controlling not only compositional parameters (monomer ratios: HFP 8.0-9.4 mass%, PPVE 0.6-1.5 mass%) but also processing parameters (melt flow rate: 6.8-9.9 g/10min at 372°C). This dual control ensures the polymer flows properly during injection molding for high production efficiency while maintaining dimensional stability and surface quality for excellent article quality, preventing deflection and molding defects.
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 8.0 to 9.4% by mass with respect to the whole of the monomer units, a content of perfluoro (propyl vinyl ether) unit of 0.6 to 1.5% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 6.8 to 9.9 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 90 or less.