Fluorine Copolymer Composition for Low-Contamination Thin-Wall Molding
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Solution Overview
Problem
Conventional fluorine-containing copolymers are inadequate for producing high-productivity, durable thin-wall injection molded articles, such as large-type wafer carriers, and fail to prevent damage from chemical solutions, especially in terms of fluorine ion dissolution and contamination.
Innovation Solution
A fluorine-containing copolymer comprising tetrafluoroethylene, hexafluoropropylene, and fluoro(alkyl vinyl ether units, with specific content ratios and melt flow rates, enhancing formability, abrasion resistance, ozone resistance, low oxygen permeation, and tensile creep resistance, while minimizing fluorine ion dissolution in chemical solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fluorine-containing copolymers are used for injection molding, then productivity is improved, but manufacturing precision and product quality deteriorate due to inability to produce thin-wall articles
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of the copolymer (HFP unit content: 7.0-9.4 mass%, FAVE unit content: 1.3-2.9 mass%) and processing parameters (melt flow rate: 15-40 g/10min at 372°C, injection speed: 60-100 mm/s). These parameter optimizations enable the material to be molded at very high injection speeds while producing thin-wall articles with excellent quality, resolving the contradiction between productivity and manufacturing precision.
2Ease of manufacture
If conventional fluorine-containing copolymers are used, then ease of manufacture is improved, but reliability deteriorates due to poor abrasion resistance and chemical solution resistance
Solution Approach 1:
The patent employs composite material design by creating a copolymer that integrates three different monomer units (TFE, HFP, and FAVE), each contributing specific properties. The TFE provides base fluoropolymer characteristics, HFP enhances mechanical properties and chemical resistance, and FAVE improves processability. This composite structure achieves both ease of manufacture and high reliability with excellent abrasion resistance (110°C abrasion resistance) and chemical solution resistance.
3Ease of operation
If conventional fluorine-containing copolymers are used for coating, then ease of operation is improved, but manufacturing precision deteriorates due to non-uniform coating thickness
Solution Approach 1:
The patent applies parameter changes by optimizing the melt flow rate (15-40 g/10min at 372°C) and molecular weight characteristics of the copolymer. These parameter adjustments enable the material to flow uniformly during extrusion coating processes, ensuring consistent coating thickness even on small-diameter core wires, thus resolving the contradiction between ease of operation and manufacturing precision.
4Productivity
If conventional fluorine-containing copolymers are used, then productivity is improved, but object-generated harmful factors worsen due to fluorine ion dissolution and contamination
Solution Approach 1:
The patent employs composite material design with a specific trio of monomer units (TFE, HFP, FAVE) where each component contributes to the overall chemical stability. The fluorinated structures of all three monomers work synergistically to create a highly resistant matrix that prevents fluorine ion dissolution in chemical solutions, eliminating contamination while maintaining high production efficiency.
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.