Crosslinked Fluoropolymer Blend for Stable Compression Set
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Solution Overview
Problem
Conventional fluoroelastomer composites exhibit increased compression set under severe conditions, despite having a small compression set initially.
Innovation Solution
A polymer blend comprising a fluoroelastomer with tetrafluoroethylene, fluoroalkyl vinyl ether, and a nitrogen-containing crosslinking site, and a crystalline fluoropolymer with tetrafluoroethylene and a nitrogen-containing crosslinking site, where the nitrogen-containing sites are crosslinked, with a regulated melting point and content of the crystalline fluoropolymer, to form a suitable hardness and suppress increased compression set under severe conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluoroelastomer composites are used, then the compression set is small initially, but the compression set increases under severe conditions
Solution Approach 1:
The patent uses a composite material system comprising fluoroelastomer (a) and crystalline fluoropolymer (b) with specific compositional ratios (4.0 to 15.0% by mass). This composite structure combines the elastomeric properties of fluoroelastomer with the dimensional stability of crystalline fluoropolymer, achieving both small initial compression set and stable performance under severe conditions through synergistic material interaction
Solution Approach 2:
The patent precisely controls key parameters including the melting point (310 to 320°C), crystalline fluoropolymer content (4.0 to 15.0% by mass), and molecular structure characteristics. By optimizing these parameters, the material achieves optimal balance between flexibility and heat resistance, preventing compression set increase under severe conditions while maintaining initial performance
2Strength
If the crystalline fluoropolymer content is increased to improve hardness, then the compression set decreases, but the material becomes too rigid
Solution Approach 1:
The patent optimizes the crystalline fluoropolymer content parameter to a specific range (4.0 to 15.0% by mass) rather than maximizing it. This parameter optimization achieves sufficient hardness and compression set resistance while preserving adequate flexibility and adaptability, avoiding excessive rigidity through controlled compositional balance
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 polymer blend achieves a small compression set at high temperatures and maintains this property even after severe use, with a melting point of 310 to 320°C and a crystalline fluoropolymer content of 4.0 to 15.0% by mass.
Implementation Method 1
the nitrogen-containing sites are crosslinked
Implementation Method 2
an emulsion mixture comprising 1) a microemulsion of a composition comprising a crosslinkable fluoroelastomer terpolymer
Data Source
AI summary
Provided is a polymer blend containing (a) a fluoroelastomer and (b) a crystalline fluoropolymer, wherein the fluoroelastomer (a) contains tetrafluoroethylene unit, a fluoroalkyl vinyl ether unit, and a nitrogen-containing crosslinking site, the crystalline fluoropolymer (b) contains tetrafluoroethylene unit and a nitrogen-containing crosslinking site, the polymer blend has a melting point of 310 to 320° C., and the content of the crystalline fluoropolymer (b) in the polymer blend is 4.0 to 15.0% by mass based on the total mass of the fluoroelastomer (a) and the crystalline fluoropolymer (b).