Fluorinated Crosslinking Agent for Fluoroelastomer Heat Resistance
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Solution Overview
Problem
Existing crosslinked fluoroelastomers used in high-temperature applications, such as power plants, exhibit poor heat and vapor resistance, necessitating the development of a novel crosslinking agent to enhance these properties.
Innovation Solution
A crosslinking agent represented by specific fluorine-containing aromatic compounds is used to improve the heat resistance of crosslinked fluoroelastomers, comprising structures with fluorine atoms and alkyl or aryl groups, which are incorporated into the fluoroelastomer composition along with a crosslinking initiator to form a seal material with enhanced thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crosslinking agents (TAIC, divinylbenzene, divinylbiphenyl) are used to produce crosslinked fluoroelastomer, then the fluoroelastomer achieves crosslinked structure and basic sealing function, but the heat resistance and vapor resistance are insufficient for high-temperature water vapor applications
Solution Approach 1:
The patent modifies the chemical structure of crosslinking agents by introducing fluorine atoms and aromatic rings into the molecular structure. This structural parameter change enhances the crosslinking agent's ability to resist heat and water vapor, directly resolving the reliability issue while maintaining manufacturability through established polymerization processes
Solution Approach 2:
The invention creates a composite crosslinking system combining fluorinated aromatic compounds with fluoroelastomer matrices. This composite approach integrates the thermal stability of aromatic structures with the elasticity of fluoroelastomers, achieving both high heat resistance and vapor resistance without compromising the sealing function
2Power
If the temperature of water vapor is increased to improve power generation efficiency, then energy production improves, but the requirement for heat resistance of seal materials becomes more stringent
Solution Approach 1:
The patent applies preliminary thermal stabilization by incorporating heat-resistant fluorinated aromatic crosslinking agents into the fluoroelastomer before the material is exposed to high-temperature water vapor in power generation applications. This pre-prepared thermal resistance allows the seal material to withstand elevated temperatures without degradation, enabling higher power generation efficiency
3Reliability
If existing crosslinked fluoroelastomer formulations are used, then basic sealing performance is achieved, but vapor resistance deteriorates under saturated water vapor exposure at high temperatures
Solution Approach 1:
The patent enhances local quality at the molecular level by introducing fluorinated aromatic crosslinking structures that create dense, thermally stable crosslink points within the fluoroelastomer matrix. These localized fluorinated aromatic regions act as barriers to water vapor penetration, significantly improving vapor resistance while maintaining the overall elastomeric properties needed for sealing applications
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 crosslinked fluoroelastomer exhibits a weight reduction ratio of 7% or less at 330°C and a weight swelling change ratio of 70% or less when exposed to saturated water vapor at 300°C, demonstrating improved heat and vapor resistance.
Implementation Method 1
A crosslinking agent including a compound represented by a formula (1)... a crosslinked fluoroelastomer obtained by crosslinking the composition
Implementation Method 2
The crosslinked fluoroelastomer exhibits a weight reduction ratio of 7% or less at 330°C and a weight swelling change ratio of 70% or less when exposed to saturated water vapor at 300°C, demonstrating improved heat and vapor resistance
Data Source
AI summary
A crosslinking agent includes a compound represented by a formula (1),wherein R1, R2, and R3 are independently a hydrogen atom, a fluorine atom, an alkyl group, a fluoroalkyl group, or a substituted or unsubstituted aryl group, a plurality of R1 are identical to or different from each other, a plurality of R2 are identical to or different from each other, and a plurality of R3 are identical to or different from each other, provided that at least one of R1, R2, and R3 is a hydrogen atom, and at least one of R1, R2, and R3 is a fluorine atom or a fluorine atom-containing group; m is an integer from 2 to 6; l is an integer from 0 to 2; and each hydrogen on the benzene ring(s) may be substituted.