FFKM Crosslinking with Fluorinated Imide for Heat Resistance
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Solution Overview
Problem
Rubbers derived from crosslinking FFKM lack satisfactory short-term and long-term heat resistance, despite existing methods aimed at improving these properties.
Innovation Solution
A fluorine-containing compound represented by a specific formula is introduced into the monomer constituent unit of FFKM, resulting in a cross-linked fluorine-containing copolymer with excellent short-term and long-term heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If existing crosslinking methods (peroxide, bismaleimide, nitrile group trimerization, bisaminophenol) are used to improve heat resistance of FFKM, then short-term or long-term heat resistance is partially improved, but both short-term and long-term heat resistance simultaneously remain unsatisfactory
Solution Approach 1:
The patent changes the chemical structure parameters of the crosslinking agent by introducing a fluorinated imide group with specific molecular weight (6-12 fluorine atoms). This structural parameter change enables the crosslinked FFKM to achieve both excellent short-term heat resistance (maintaining mechanical properties at 300°C) and long-term heat resistance (stability after aging), resolving the contradiction between these two heat resistance aspects.
Solution Approach 2:
The patent creates a composite crosslinked structure by combining FFKM base polymer with fluorinated imide crosslinking agents. This composite material system integrates the heat resistance of FFKM with the thermal stability of the fluorinated imide group, achieving simultaneous improvement in both short-term and long-term heat resistance that neither component could achieve alone.
2Strength
If crosslinking density is increased to improve high-temperature mechanical properties, then storage modulus and deformation resistance improve, but processing difficulty and crosslinking control become more challenging
Solution Approach 1:
The patent optimizes the molecular weight parameter of the crosslinking agent (6-12 fluorine atoms) to achieve optimal crosslinking density. This parameter optimization ensures sufficient crosslinking for high mechanical strength at elevated temperatures while maintaining manageable crosslinking kinetics for practical processing and manufacturing.
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 cross-linked product exhibits superior mechanical properties at high temperatures, maintaining storage modulus and resisting deformation for extended periods at 300°C.
Implementation Method 1
a fluorine-containing compound having a vinyl or fluorovinyl group as a polymerizable unsaturated bond and a carbonyl group in the main chain, wherein the fluorine-containing compound is introduced, as a monomer constituent unit, into FFKM to form a cross-linked fluorine-containing copolymer product having a cross-linked structure comprising an indole ring
Data Source
AI summary
Provided are a fluorine-containing compound suitable to produce rubber having both excellent short-term and long-term heat resistance, a fluorine-containing copolymer using such a compound, and a fluorine-containing copolymer composition. A fluorine-containing compound represented by formula (1) below, a fluorine-containing copolymer using such a compound, and a fluorine-containing copolymer composition. In formula (1), R1 to R3 are each independently a hydrogen atom or a fluorine atom; R4 is a hydrogen atom, a fluorine atom, or a C1-8 monovalent organic group free from a carbonyl group; Z is an oxygen atom, a sulfur atom, or -N(R5)- where R5 is a hydrogen atom or a C1-4 monovalent organic group; X is a single bond or a difluoromethylene group; Y1 to Y4 are each independently a fluorine atom or a trifluoromethyl group; and Q is a C1-8 perfluoroalkylene group optionally containing an etheric oxygen atom.