Perfluoroelastomer composition, crosslinked perfluoroelastomer and molded article
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Solution Overview
Problem
Existing cross-linked perfluoroelastomers, such as those using triallyl isocyanurate (TAIC), cannot withstand high-temperature and high-pressure steam atmospheres above 200°C, making them unsuitable for deep underground power generation sites like geothermal and oil fields, where they crack due to rapid decompression.
Innovation Solution
A composition comprising perfluoroelastomer, carbon black, and a specific crosslinking agent represented by formula (1), along with optional additives, is used to create a cross-linked perfluoroelastomer with enhanced heat, vapor, and rapid decompression resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a general crosslinking agent like TAIC is used to achieve crosslinking, then crosslinking is achieved, but the usable temperature limit is just over 200°C and cannot withstand high-temperature steam atmospheres
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking agent by using a perfluoroalkyl vinyl ether compound instead of conventional crosslinking agents like TAIC. This parameter change enables the crosslinked perfluoroelastomer to withstand temperatures of 200°C or higher in high-temperature steam atmospheres, directly resolving the temperature limit constraint while maintaining crosslinking functionality.
Solution Approach 2:
The patent creates a composite material system combining perfluoroelastomer with specific crosslinking agents (perfluoroalkyl vinyl ether compounds) and fillers. This composite approach achieves both the required heat resistance for high-temperature steam environments and the necessary crosslinking structure, overcoming the limitations of conventional single-material solutions.
2Ease of operation
If the sealing material is exposed to rapid decompression environment, then the gas dissolved in the sealing material expands at once, but the sealing material cracks
Solution Approach 1:
The patent changes the physical and chemical parameters of the elastomer matrix through optimized crosslinking density and composition. The specific crosslinking system creates a network structure that can accommodate gas expansion during rapid decompression without cracking, directly improving both rapid decompression resistance and crack resistance simultaneously.
3Power
If the temperature of water vapor is elevated to increase power generation efficiency, then power generation efficiency increases, but the sealing material requires higher heat resistance
Solution Approach 1:
The patent changes the thermal parameters of the sealing material by introducing a novel crosslinking system that raises the service temperature threshold to 200°C or higher. This enables the sealing material to maintain integrity in high-temperature steam environments required for improved power generation efficiency, directly addressing the heat resistance requirement.
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 resulting cross-linked perfluoroelastomer exhibits improved heat resistance, vapor resistance, and rapid decompression resistance, suitable for high-temperature environments, preventing cracking and maintaining integrity in deep underground applications.
Implementation Method 1
a crosslinking agent which is a compound having a fluorinated group and represented by the following formula (1): [formula with R1, A, and X groups]
Implementation Method 2
carbon black in an amount of 55 to 75 parts by weight per 100 parts by weight of the perfluoroelastomer
Data Source
AI summary
A composition comprising a perfluoroelastomer, carbon black in an amount of 55 to 75 parts by weight per 100 parts by weight of the perfluoroelastomer, and a crosslinking agent represented by the following formula (1): wherein in the formula (1), A is a single bond, -O-, an alkylene group, or a fluoroalkylene group; R1, R2, and R3 are independently a hydrogen atom, a fluorine atom, an alkyl group, or a fluoroalkyl group; and provided that at least one of R1, R2, and R3 is a fluorine atom or a fluoroalkyl group.