Laminate Composition for Fuel Hose Adhesion During Steam Vulcanization
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Solution Overview
Problem
Existing laminates for automotive fuel hoses face challenges with adhesion, particularly between fluorine-containing polymer layers and epichlorohydrin-type rubber layers, especially during steam vulcanization.
Innovation Solution
A composition for a laminate that includes epichlorohydrin-type polymer, zinc dithiocarbamate, a specific compound from the group of 1,8-diazabicyclo[5.4.0]undecene-7 salt or 1,5-diazabicyclo[4.3.0]nonene-5, and a metal salt hydrate, which enhances adhesion when vulcanized and exposed to steam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-containing polymer is used for fuel hose material, then resistance to thermal aging, weather resistance, and gasoline impermeability are improved, but cost increases and resistance to cold deteriorates
Solution Approach 1:
The patent employs a laminate structure combining fluorine-containing polymer (for chemical resistance and impermeability) with epichlorohydrin-type rubber (for cold resistance and elasticity). This composite approach allows each material to contribute its advantageous properties, creating a fuel hose that meets all performance requirements including cold temperature flexibility.
2Object-affected harmful factors
If laminate structure with fluorine-containing polymer and epichlorohydrin-type rubber is employed, then cold resistance is improved, but adhesion between layers deteriorates
Solution Approach 1:
The patent introduces a specific adhesion promoter composition containing zinc dithiocarbamate, 1,8-diazabicyclo[5.4.0]undecene-7 salt, and metal salt hydrate as intermediary substances at the interface between the fluorine-containing polymer layer and epichlorohydrin-type rubber layer. These intermediary compounds facilitate chemical bonding between the two polymer layers, resolving the adhesion problem while maintaining the laminate structure's cold resistance benefits.
3Ease of manufacture
If conventional adhesion techniques are used for laminate, then manufacturing is simplified, but adhesion strength during steam vulcanization deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesion promoter by incorporating specific ratios of zinc dithiocarbamate, 1,8-diazabicyclo[5.4.0]undecene-7 salt, and metal salt hydrate. This compositional parameter optimization enables the adhesion promoter to maintain effectiveness during steam vulcanization conditions, achieving strong interlayer bonding without complicating the manufacturing process.
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 exhibits excellent adhesion when vulcanized and made to adhere, both at room temperature and during steam vulcanization, making it suitable for use in automotive fuel lines.
Implementation Method 1
the adhesion between those hoses that will be most important... measures are typically employed such as the blending of additives of certain type(s) within polymer compositions... adoption of the techniques described at Patent Reference Nos. 1 through 3 will permit adhesion of the fluorine-containing polymer layer and the epichlorohydrin-type rubber layer
Implementation Method 2
achieve a laminate having more excellent adhesion when vulcanized and made to adhere... excellent adhesion when made to adhere with use of steam
Data Source
AI summary
A hose or tube comprising a laminate, a laminate employing a composition for a laminate, and a composition for a laminate characterized in that it contains (a) epichlorohydrin-type polymer; (b) zinc dithiocarbamate; (c) at least one compound which is a species selected from among the group consisting of 1,8-diazabicyclo[5.4.0]undecene-7 salt, 1,5-diazabicyclo[4.3.0]nonene-5 salt, 1,8-diazabicyclo[5.4.0]undecene-7, and 1,5-diazabicyclo[4.3.0]nonene-5; and (d) metal salt hydrate.