Fluoroelastomer Laminate Structure for Low Fuel Permeability
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Solution Overview
Problem
Existing laminates for fuel hoses struggle with high fuel permeability and shrinkage during crosslinking, which are not adequately addressed by current technologies.
Innovation Solution
A laminate comprising a fluoroelastomer layer with dispersed polytetrafluoroethylene (PTFE) particles and a polymer layer, adhered with a basic polyfunctional compound, to enhance adhesive strength and suppress shrinkage during crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluoroelastomer layer is used to achieve low fuel permeability, then fuel permeability is reduced, but shrinkage occurs during crosslinking
Solution Approach 1:
The patent applies composite materials by combining fluoroelastomer with polytetrafluoroethylene (PTFE) particles to create a multi-phase composite system. The PTFE particles are dispersed within the fluoroelastomer matrix, creating a composite structure that leverages the low permeability of fluoroelastomer while using PTFE to suppress shrinkage during crosslinking through volume expansion.
Solution Approach 2:
The patent changes the physical and chemical parameters of the fluoroelastomer system by controlling the particle size, concentration, and distribution of PTFE particles. By optimizing these parameters (PTFE content at 1-50 parts by mass per 100 parts of fluoroelastomer, particle size of 0.1-10 μm), the patent achieves the desired balance between maintaining low fuel permeability and suppressing shrinkage during crosslinking.
2Strength
If adhesive strength between layers is increased, then bonding is improved, but complexity of the composition increases
Solution Approach 1:
The patent uses a basic polyfunctional compound as an intermediary substance between the fluoroelastomer/PTFE composite and the polymer layer. This intermediary agent promotes adhesion through chemical interaction without requiring complex multi-layer adhesive systems, thus achieving strong bonding while maintaining relative compositional simplicity.
Solution Approach 2:
The patent applies local quality by concentrating the adhesive function at the interface between layers through the use of basic polyfunctional compounds, rather than requiring the entire composite material to have uniform adhesive properties. This allows strong interlayer bonding while keeping the bulk material composition relatively simple and focused on its primary functions of low permeability and shrinkage suppression.
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 low fuel permeability and prevents shrinkage of the fluoroelastomer layer during crosslinking, ensuring robust adhesion and maintaining shape integrity.
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
Provided is a laminate comprising a fluoroelastomer layer and a polymer layer, wherein the fluoroelastomer layer is formed of a fluoroelastomer composition containing a fluoroelastomer, a basic polyfunctional compound, and a polytetrafluoroethylene, and the polytetrafluoroethylene is dispersed in a state of single particles in the fluoroelastomer layer.