Fluoroelastomer Sealing Composition for High-Temperature Ozone Resistance
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Solution Overview
Problem
Fluoro-rubber molded articles exhibit insufficient ozone resistance under high-temperature environments, and it is challenging to obtain effective crosslinking agents for such applications.
Innovation Solution
An elastomer composition comprising a first fluoroelastomer copolymer derived from tetrafluoroethylene and perfluoro(alkoxyvinyl ether) combined with a second fluoroelastomer, preferably a perfluoroelastomer, along with a peroxide crosslinking agent and co-crosslinking agent, to form a crosslinked product with enhanced ozone resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluoro-rubber molded articles are used, then they provide basic sealing functionality, but they exhibit insufficient ozone resistance under high-temperature environments
Solution Approach 1:
The invention uses a composite elastomer system comprising two distinct fluoroelastomers (first fluoroelastomer with TFE and perfluoro(alkoxyvinyl ether) units, and second fluoroelastomer with TFE and perfluoro(alkyl vinyl ether) units). This composite material approach combines the complementary properties of different elastomer types to achieve both high-temperature stability and excellent ozone resistance that neither component could achieve alone.
Solution Approach 2:
The invention changes the chemical composition parameters of the elastomer by incorporating specific fluorinated monomer units (perfluoro(alkoxyvinyl ether) and perfluoro(alkyl vinyl ether)) in controlled ratios. This parameter modification at the molecular level enhances the material's resistance to ozone attack while maintaining thermal stability at elevated temperatures.
2Reliability
If effective crosslinking agents are used to improve ozone resistance, then ozone resistance improves, but it becomes difficult to obtain such crosslinking agents
Solution Approach 1:
The invention replaces rare or difficult-to-obtain crosslinking agents with commonly available peroxide crosslinking agents. This substitution uses inexpensive, readily accessible materials to achieve the same or better crosslinking效果, making the manufacturing process more accessible and economical.
Solution Approach 2:
The invention changes the crosslinking mechanism by using peroxide-based crosslinking agents that work effectively with the specific fluoroelastomer composition. This parameter change in the crosslinking chemistry enables the use of commercially available agents rather than requiring specialized or rare crosslinking agents.
3Reliability
If a single fluoroelastomer composition is used, then the formulation is simple, but the ozone resistance under high-temperature conditions is insufficient
Solution Approach 1:
The invention employs a composite elastomer formulation combining two different fluoroelastomer types with specific monomer compositions. This composite approach creates synergistic effects where the combination of different elastomer properties (chemical structure, crosslinking behavior, thermal stability) produces superior ozone resistance compared to single elastomer systems.
Solution Approach 2:
The invention applies local quality by having different elastomer components serve specific functions: the first fluoroelastomer provides base sealing properties and thermal stability, while the second fluoroelastomer enhances ozone resistance. Each component is optimized for its specific role in the composite system.
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 elastomer composition achieves excellent ozone resistance under high-temperature conditions, with minimal change in physical properties before and after exposure to high-temperature ozone, as indicated by a close tensile product ratio, making it suitable for sealing materials in harsh environments.
Implementation Method 1
a peroxide crosslinking agent and a co-crosslinking agent
Data Source
AI summary
Provided are an elastomer composition including a first fluoroelastomer that is a copolymer of tetrafluoroethylene and perfluoro (alkoxyvinyl ether) and a second fluoroelastomer different from the first fluoroelastomer, and a sealing material including a crosslinked product of the elastomer composition.