Fluoropolymer Lining Valve Flange Abrasion and Sealability
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Solution Overview
Problem
Conventional injection molded lining pipes and valves with fluororesin lining suffer from abrasion of the inner surface and reduced sealability when exposed to high-temperature fluids containing solid particles, and the flange sections deform or lose sealability due to increased thickness, leading to mechanical weakness.
Innovation Solution
An injection molded article with a pipe body section and a flange section of maximum thickness 2 to 12 mm, formed from a copolymer containing tetrafluoroethylene and fluoro(alkyl vinyl ether units, with specific content and melt flow rate ranges, and limited functional groups to enhance abrasion resistance and maintain sealability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flange section thickness is increased to improve mechanical strength and impact resistance, then the sealability of the flange section deteriorates due to deformation at high temperatures
Solution Approach 1:
The patent applies parameter changes by precisely controlling the melt flow rate (4.0-11.0 g/10 min at 372°C) and functional group content (50 or less per 10^6 carbon atoms) of the copolymer material. These parameter optimizations enable the flange section to maintain both high mechanical strength and excellent sealability at elevated temperatures, resolving the contradiction between thickness-related strength and temperature-related sealability.
2Reliability
If conventional fluororesin lining is used in high-temperature environments with solid particles, then the inner surface undergoes abrasion and loses integrity
Solution Approach 1:
The patent optimizes material parameters by controlling the melt flow rate and functional group content of the copolymer, creating an inner surface with enhanced abrasion resistance that maintains integrity under high-temperature conditions with solid particle exposure.
Solution Approach 2:
The patent uses a copolymer containing tetrafluoroethylene units and fluoro(alkyl vinyl ether) units with specific compositional ratios, creating a composite material structure that combines chemical inertness with mechanical durability to resist abrasion from solid particles.
3Ease of manufacture
If the melt flow rate of the copolymer is increased to improve moldability and filling, then the abrasion resistance of the inner surface deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing an optimal melt flow rate range (4.0-11.0 g/10 min at 372°C) that balances moldability and abrasion resistance. This precise parameter control ensures sufficient material flow for complete mold filling while maintaining adequate abrasion resistance of the formed inner surface.
Data Source
AI summary
Provided is an injection molded article including a pipe body section forming a flow path of a fluid, and a flange section formed on one end or both ends of the pipe body section, wherein the maximum thickness of the flange section is 2 to 12 mm, the injection molded article contains a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 2.8 to 6.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 4.0 g/10 min or higher and lower than 11.0 g/10 min, and the number of functional groups of the copolymer is 50 or less.