Fluorine Elastomer Composition for Low Compression Set
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Solution Overview
Problem
Current fluorine-containing elastomer compositions used in high-temperature applications, such as in the aviation and semiconductor industries, face challenges in achieving optimal sealing properties and heat resistance while maintaining mechanical strength and low compression set.
Innovation Solution
A fluorine-containing elastomer composition comprising a perfluoroelastomer with specific monomer units and a crosslinking agent, optimized for high temperature performance, which includes a perfluoro(alkyl vinyl ether) unit, a nitrile group-containing monomer unit, and a crosslinking agent capable of forming rings like oxazole, thiazole, or triazine, to enhance crosslinking density and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a perfluoroelastomer with nitrile group crosslinking system is used to improve heat resistance, then thermal stability and chemical resistance are improved, but compression set of the cured article increases
Solution Approach 1:
The patent changes the chemical composition parameters of the perfluoroelastomer by precisely controlling the content of perfluoro(alkyl vinyl ether) units (18-33 mol%) and monomer units with nitrile/carboxyl/alkoxycarbonyl groups (0.3-0.6 mol%). This parameter optimization enables the polymer to achieve both high heat resistance and low compression set by balancing crosslinking density and chain flexibility.
Solution Approach 2:
The patent creates a composite crosslinking system by combining perfluoroelastomer with specific monomer units (providing nitrile, carboxyl, or alkoxycarbonyl groups) and crosslinking agents (B). This composite approach at the molecular level enables simultaneous achievement of thermal stability, chemical resistance, and low compression set through synergistic interactions between different functional groups.
2Strength
If crosslinking density is increased to improve mechanical strength and heat resistance, then thermal stability is improved, but compression set increases
Solution Approach 1:
The patent optimizes the crosslinking density parameter by controlling the amount of monomer units with reactive groups (0.3-0.6 mol%) and adjusting the ratio of crosslinking agent (B) to perfluoroelastomer (0.3-10.0 parts by mass per 100 parts by mass of elastomer). This precise parameter control achieves optimal balance between mechanical strength and compression set resistance.
Solution Approach 2:
The patent introduces local functional groups (nitrile, carboxyl, or alkoxycarbonyl groups) at specific positions within the perfluoroelastomer chain. These localized reactive sites enable controlled crosslinking at specific regions, creating a heterogeneous network structure that provides both strength and flexibility, thereby reducing compression set while maintaining mechanical integrity.
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 composition achieves a balance of excellent heat resistance, mechanical strength, and reduced compression set, making it suitable for high-temperature sealing applications, such as in semiconductor manufacturing equipment.
Implementation Method 1
a crosslinking agent (B) crosslinkable with at least one selected from the group consisting of a nitrile group, a carboxyl group and an alkoxycarbonyl group of the monomer unit (b)
Data Source
AI summary
A fluorine-containing elastomer composition assuring a low compression set and comprising a perfluoroelastomer (A) comprising (a) 18 to 33 % by mole of a perfluoro(alkyl vinyl ether) unit, (b) 0.3 to 0.6 % by mole of a monomer unit having at least one selected from the group consisting of a nitrile group, a carboxyl group and an alkoxycarbonyl group and (c) a tetrafluoroethylene unit.