Fluoroelastomer Hose Layer for Acid Resistance and Silicone Adhesion
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Solution Overview
Problem
Air management system components, such as turbocharger hoses and exhaust gas recirculation hoses, require high acid resistance and adhesion to silicone rubber, which existing fluoroelastomer compositions fail to provide effectively.
Innovation Solution
Incorporating a hydrotalcite compound into a peroxide-crosslinkable fluoroelastomer composition enhances adhesion to silicone rubber while maintaining high acid resistance, forming a crosslinked fluoroelastomer layer suitable for use in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peroxide-crosslinkable fluoroelastomer composition is used to maintain acid resistance, then acid resistance is improved, but adhesion to silicone rubber deteriorates
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the peroxide-crosslinkable fluoroelastomer and silicone rubber. The silane coupling agent contains both silane groups that react with the fluoroelastomer and alkoxy groups that bond with silicone rubber, creating a chemical bridge that enables strong adhesion while preserving the acid resistance properties of the fluoroelastomer base material
Solution Approach 2:
The invention creates a composite material system consisting of peroxide-crosslinkable fluoroelastomer, silane coupling agent, and silicone rubber. This composite structure combines the acid resistance of fluoroelastomer with the adhesion properties of silicone rubber through the mediating silane coupling agent, achieving both required properties simultaneously
2Temperature
If a fluoroelastomer composition is crosslinked to form a crosslinked fluoroelastomer layer, then heat resistance is improved, but adhesion to silicone rubber deteriorates
Solution Approach 1:
The silane coupling agent is incorporated into the fluoroelastomer composition before crosslinking occurs. This preliminary incorporation ensures that the adhesion-promoting silane groups are already positioned at the interface between fluoroelastomer and silicone rubber before the crosslinking network forms, preventing the crosslinking process from isolating or burying these critical adhesion sites
Solution Approach 2:
The silane coupling agent serves as a mediating layer that remains functional after crosslinking. It contains reactive groups that bond with both the crosslinked fluoroelastomer matrix and the silicone rubber, maintaining adhesion strength even when the fluoroelastomer is highly crosslinked for maximum heat resistance
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 air management system components exhibit improved adhesion to silicone rubber and sustained acid resistance, making them suitable for applications in turbocharger hoses and exhaust gas recirculation hoses exposed to acidic gases.
Implementation Method 1
a crosslinked fluoroelastomer layer obtainable by crosslinking a fluoroelastomer composition that contains a peroxide-crosslinkable fluoroelastomer
Implementation Method 2
mixing a hydrotalcite compound into a peroxide-crosslinkable fluoroelastomer composition can lead to good adhesiveness to silicone rubber
Data Source
AI summary
An air management system component containing a crosslinked fluoroelastomer layer obtained by crosslinking a fluoroelastomer composition that contains a peroxide-crosslinkable fluoroelastomer and a hydrotalcite compound. Also disclosed is the fluoroelastomer composition.