Crosslinked ETFE Valve Member for Creep-Resistant Sealing
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Solution Overview
Problem
Conventional resin-coated valve members suffer from creep damage and deformation over time, leading to reduced sealing properties and potential contamination from exposed adhesion layers, which compromises durability and safety.
Innovation Solution
A valve member made from a crosslinked ethylene-tetrafluoroethylene copolymer with a crosslinking density of 85.0 mol/m3 or more, achieved through electron beam irradiation, which enhances creep resistance, wear resistance, and corrosion resistance, preventing plastic deformation and eliminating the need for a metal base body and its associated contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin coating film is formed on a metal base body through adhesion layers, then sealing property is improved, but creep damage occurs over time leading to deformation and reduced durability
Solution Approach 1:
The invention uses a composite structure consisting of a metal base body and a resin coating film made of tetrafluoroethylene-perfluoroalkoxyethylene copolymer. The metal base body provides structural strength while the resin coating film provides sealing properties and corrosion resistance, creating a composite material system that combines the advantages of both materials to achieve both good sealing property and long-term durability.
Solution Approach 2:
The invention changes the chemical composition parameters of the resin coating film by specifying a tetrafluoroethylene-perfluoroalkoxyethylene copolymer with specific monomer ratios (tetrafluoroethylene 30-70 mol%, perfluoroalkoxyethylene 30-70 mol%). This parameter optimization ensures the resin has appropriate balance of sealing properties, creep resistance, and adhesion to the metal base body, preventing deformation over time while maintaining reliable sealing.
2Reliability
If a resin coating film is used to improve sealing, then sealing property is enhanced, but adhesion layers may be exposed as contaminants over time
Solution Approach 1:
The invention optimizes the resin coating film composition using tetrafluoroethylene-perfluoroalkoxyethylene copolymer with specific monomer ratios and controls the film thickness to 1-10 μm. These parameter changes create a sufficiently thick and chemically stable sealing layer that prevents exposure of underlying adhesion layers, eliminating the source of contamination while maintaining effective sealing properties.
Solution Approach 2:
The invention eliminates the need for separate adhesion layers by using a resin coating film thick enough (1-10 μm) to serve as both the sealing layer and the protective outer layer. This replaces the multi-layer structure (metal base + adhesion layer + resin layer) with a more robust configuration where the resin coating film itself prevents contamination, effectively making the system more reliable without requiring disposable or replaceable adhesion layers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a durable, resistant valve member that maintains sealing properties and prevents contamination, with improved manufacturing efficiency and cost-effectiveness by eliminating the need for additional adhesion layers and ensuring long-term resistance to deformation.
Implementation Method 1
a resin formed product having a crosslinked ethylene-tetrafluoroethylene copolymer as a main component, and having a crosslinking density of 85.0 mol/m3 or more calculated from a storage modulus at 300° C.
Implementation Method 2
achieved through electron beam irradiation, which enhances creep resistance, wear resistance, and corrosion resistance
Data Source
AI summary
The valve member according to one embodiment of the present disclosure is a resin formed product having a crosslinked ethylene-tetrafluoroethylene copolymer as a main component, and having a crosslinking density of 85.0 mol/m3 or more calculated from a storage modulus at 300° C.