Fluorine Copolymer Composition for Thin-Wall High-Speed Molding
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Solution Overview
Problem
Existing fluorine-containing copolymers are unable to produce thin-wall, high-quality molded products with excellent abrasion resistance, ozone resistance, solvent crack resistance, low oxygen permeation, high-temperature rigidity, and tensile creep resistance, while also preventing the dissolution of fluorine ions in chemical solutions.
Innovation Solution
A fluorine-containing copolymer comprising specific ratios of tetrafluoroethylene, hexafluoropropylene, and fluoro(alkyl vinyl ether) units, with controlled melt flow rate and functional group content, allowing for high-speed injection molding and extrusion forming on small-diameter core wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluorine-containing copolymer is molded at high injection speed to produce thin-wall products, then productivity and product thickness are improved, but manufacturing precision and product quality deteriorate
Solution Approach 1:
The patent adjusts the melt flow rate parameter to a specific range (20-40 g/10min at 372°C) and controls the composition ratios of monomer units (TFE 90-97 mass%, HFP 1-10 mass%, PEVE 0.5-5 mass%) to optimize the balance between flowability and structural integrity, enabling high-speed injection molding while maintaining product quality
Solution Approach 2:
The patent creates a composite copolymer structure combining three different fluorinated monomers (TFE, HFP, and PEVE) with specific compositional ratios, where each monomer contributes different properties that collectively enable both high processability and excellent mechanical/chemical resistance properties
2Productivity
If fluorine-containing copolymer is formed into coating layer on small-diameter core wire, then productivity is improved, but manufacturing precision and coating uniformity deteriorate
Solution Approach 1:
The patent optimizes the melt flow rate to 20-40 g/10min at 372°C, providing ideal viscosity characteristics for extrusion coating on small-diameter wires, ensuring uniform coating thickness while maintaining high production efficiency
3Reliability
If fluorine-containing copolymer is used to achieve excellent chemical resistance, then reliability is improved, but fluorine ion dissolution in chemical solutions increases
Solution Approach 1:
The patent precisely controls the content of saturated fluorine atoms and the types of terminal groups (limiting -COOH, -COOCH3, -CONH2, and -CH2OH groups) to minimize fluorine ion dissolution while maintaining excellent chemical resistance through the fluorinated copolymer structure
Data Source
AI summary
There is provided a fluorine-containing copolymer comprising tetrafluoroethylene unit, hexafluoropropylene unit and a fluoro(alkyl vinyl ether) unit, wherein the copolymer has a content of the hexafluoropropylene unit of 7.0 to 9.4% by mass with respect to the whole of the monomer units, a content of the fluoro(alkyl vinyl ether) unit of 1.3 to 2.9% by mass with respect to the whole of the monomer units, a melt flow rate at 372°C of 15 to 40 g/10 min, and the number of functional groups of 90 or less per 106 main-chain carbon atoms.