Extruded Fluoroelastomer Laminate for Low-Permeation Fuel Hoses
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Solution Overview
Problem
Existing laminates for fuel hoses face challenges in achieving low fuel permeability and suppressing shrinkage during crosslinking of fluoroelastomer layers, which are critical for reducing environmental impact and ensuring durability.
Innovation Solution
A laminate comprising a fluoroelastomer layer formed from a fluoroelastomer composition containing polytetrafluoroethylene dispersed as single particles, along with a polymer layer, enhances adhesive strength and suppresses shrinkage by using a basic polyfunctional compound and specific surface area of PTFE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoroelastomer layer is used for fuel hoses, then fuel permeability is reduced, but shrinkage occurs during crosslinking
Solution Approach 1:
The patent uses a composite material system consisting of fluoroelastomer combined with specific additives (basic polyfunctional compound, polytetrafluoroethylene, and compound (a)) to achieve both low fuel permeability and suppressed shrinkage during crosslinking. The composite formulation allows the material to maintain dimensional stability while providing the required barrier properties against fuel permeation.
Solution Approach 2:
The patent modifies the chemical composition parameters of the fluoroelastomer layer by incorporating specific compounds in controlled amounts (compound (a) at 0.01-120 parts by mass relative to 100 parts by mass of fluoroelastomer). These parameter changes in the material composition enable the simultaneous achievement of low fuel permeability and reduced shrinkage during the crosslinking process.
2Reliability
If fluoroelastomer layer is laminated with polymer layer, then fuel permeability is reduced, but adhesive strength is insufficient
Solution Approach 1:
The patent introduces compound (a) as an intermediary substance that facilitates adhesion between the fluoroelastomer layer and the polymer layer. This compound acts as a mediator that enables sufficient adhesive strength while maintaining the low fuel permeability properties of the laminated structure. The intermediary compound bridges the interface between the two layers, ensuring strong bonding.
Solution Approach 2:
The patent creates a composite laminated structure where the fluoroelastomer layer contains specific compounds that enhance interfacial adhesion to the polymer layer. The composite formulation includes basic polyfunctional compounds and other additives that work together to provide both the barrier properties against fuel permeation and the adhesive strength required for durable lamination.
3Strength
If basic polyfunctional compound is added to fluoroelastomer composition, then adhesion is improved, but crosslinking shrinkage occurs
Solution Approach 1:
The patent introduces polytetrafluoroethylene as an intermediary substance that modifies the crosslinking behavior of the basic polyfunctional compound. This intermediary material allows the basic polyfunctional compound to provide adhesion improvement while the polytetrafluoroethylene component suppresses the shrinkage that would otherwise occur during crosslinking, achieving both objectives simultaneously.
Solution Approach 2:
The patent carefully controls the composition parameters of the fluoroelastomer mixture, including the amounts of basic polyfunctional compound and polytetrafluoroethylene, to achieve optimal balance between adhesion and shrinkage suppression. By adjusting these compositional parameters within specific ranges, the patent enables the system to provide sufficient adhesive strength while minimizing crosslinking shrinkage.
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 laminate achieves improved adhesion between fluoroelastomer and polymer layers with reduced shrinkage during crosslinking, ensuring durability and low fuel permeability, thereby meeting environmental and performance standards.
Implementation Method 1
the shrinkage of the fluoroelastomer layer when the fluoroelastomer is crosslinked can be suppressed
Implementation Method 2
the fluoroelastomer layer and the polymer layer are adhered with sufficient adhesive strength
Data Source
AI summary
A tube or a hose including a fluoroelastomer and a polytetrafluoroethylene, the tube or the hose being an extruded article. The polytetrafluoroethylene is dispersed in a state of single particles in the extruded article, or the polytetrafluoroethylene has a specific surface area of less than 8 m2/g. Also disclosed is an extruded laminate including a fluoroelastomer layer formed form the tube or hose and a polymer layer.