Vulcanizing Adhesion Composition for Fluoropolymer Laminates
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Solution Overview
Problem
Existing laminated bodies for fuel hoses face challenges in achieving strong adhesiveness between different polymer layers, particularly between fluorine-contained polymers and other gas permeability resistant materials, due to poor adhesion properties of fluorine-contained polymers with various rubbers.
Innovation Solution
A laminated body is created by heating and vulcanizing a layer of rubber composition comprising epichlorohydrin rubber or other specific rubbers with a layer of fluorine-contained polymer, using compounds like salts of 1,8-diazabicyclo(5.4.0) undecene-7, water-carrying substances, and epoxy resin to enhance adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-contained polymer is used as an inside layer to achieve gas permeability resistance, then gas impermeability is improved, but adhesiveness to outside layers deteriorates
Solution Approach 1:
An intermediate layer comprising a polymer blend of fluorine-contained polymer and NBR (nitrile butadiene rubber) is introduced between the fluorine-contained polymer inside layer and the outside layer. This intermediate layer acts as a mediator that provides both gas impermeability from the fluorine-contained polymer and improved adhesiveness from the NBR component, which has better bonding characteristics with other polymers.
Solution Approach 2:
The intermediate layer uses a composite material approach by blending fluorine-contained polymer with NBR in specific ratios (5-95 wt% fluorine-contained polymer, 95-5 wt% NBR). This composite structure combines the gas barrier properties of fluorine-contained polymer with the adhesive properties of NBR, resolving the contradiction between gas impermeability and adhesiveness.
2Reliability
If fluorine-contained polymer is used to achieve excellent chemical resistance and gas impermeability, then reliability is improved, but cost increases due to expensive material
Solution Approach 1:
The fluorine-contained polymer is concentrated in the intermediate layer where it is most needed for gas barrier properties and chemical resistance, while the NBR provides the bulk structural material with good adhesive properties. This local quality approach ensures chemical resistance is provided where required without using expensive fluorine-contained polymer throughout the entire hose structure, thereby reducing overall cost.
Solution Approach 2:
The composition ratios of fluorine-contained polymer and NBR in the intermediate layer can be adjusted (5-95 wt% range) to optimize the balance between chemical resistance, gas impermeability, and cost. By varying these parameters, the formulation can be tailored to achieve the minimum required performance at lower cost.
3Reliability
If fluorine-contained polymer is used to achieve gas permeability resistance, then gas impermeability is improved, but cold resistance deteriorates
Solution Approach 1:
The fluorine-contained polymer is localized in the intermediate layer where it provides gas barrier properties, while the NBR component provides the cold resistance property throughout the intermediate layer and at the interfaces. This spatial separation of functions allows gas impermeability and cold resistance to coexist without compromising either property.
Solution Approach 2:
The composite structure of fluorine-contained polymer and NBR in the intermediate layer combines the gas barrier properties of fluorine-contained polymer with the low-temperature flexibility and cold resistance of NBR, achieving a balance between gas impermeability and cold resistance that neither material could provide alone.
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 solution results in a vulcanized product with excellent adhesiveness to fluorine-contained polymers, improving the durability and performance of laminated bodies in harsh environments, such as fuel hoses, by ensuring strong chemical bonding between layers.
Implementation Method 1
heating/vulcanizing a layer (A) of a rubber composition and a layer (B) of a different polymer composition, layers (A) and (B) being bonded to each other
Implementation Method 2
at least one water-carrying substance (c), which is a hydrate of calcium acetate or of a sulfate of a metal selected from calcium, magnesium, sodium and copper
Data Source
AI summary
A composition for vulcanizing adhesion, comprises a rubber (a), at least one compound (b) selected from the group consisting of salts of 1,8-diazabicyclo(5.4.0) undecene-7, salts of 1,5-diazabicyclo(4.3.0)-nonene-5, 1,8-diazabicyclo(5.4.0) undecene-7, and 1,5-diazabicyclo(4.3.0)-nonene-5, and at least one water-carrying substance (c) selected from water-absorbed substances and hydrated substances.