Fluororesin-Fluororubber Laminate Bonding via Silane Modification
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Solution Overview
Problem
Current laminates face challenges in achieving firm bonding between fluororesin and fluororubber layers, especially when the fluororesin layer has excellent low fuel permeability, which is essential for applications like fuel hoses in automobiles.
Innovation Solution
A laminate configuration using a fluororubber composition with a specific basic multifunctional compound and a fluororesin layer, where the fluororubber has an absorption coefficient at 1720 cm−1 of 0.35 or lower after contact with triethyl amine, enabling firm bonding between the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fluororesin layer with low fuel permeability is used, then fuel barrier properties are improved, but bonding difficulty with fluororubber increases
Solution Approach 1:
A silane-modified fluororubber composition is used as an intermediary layer between the fluororesin barrier layer and the fluororubber inner/outer layers. The silane modification provides bonding sites that facilitate adhesion to the fluororesin layer while maintaining the low fuel permeability properties of the fluororesin barrier layer. This intermediary composition resolves the contradiction by enabling strong bonding without compromising the fuel barrier performance.
Solution Approach 2:
The fluororubber composition is modified by changing its chemical parameters through silane modification. This parameter change introduces bonding groups that can interact with the fluororesin layer, thereby improving bonding strength while preserving the low fuel permeability characteristic of the fluororesin barrier layer.
2Strength
If traditional fluororubber composition is used, then ease of bonding is improved, but fuel barrier performance deteriorates
Solution Approach 1:
The fluororubber composition is modified by silane modification, which changes its chemical parameters to include bonding groups. This parameter change enables the fluororubber layer to bond strongly to the fluororesin barrier layer while maintaining the low fuel permeability properties through the use of fluorinated polymer chains.
Solution Approach 2:
The invention uses a composite fluororubber composition that combines fluorinated polymer chains (for low fuel permeability) with silane modification groups (for bonding). This composite material structure allows simultaneous achievement of both bonding strength and fuel barrier performance.
3Object-affected harmful factors
If fluororesin is used for barrier layer, then fuel permeability is reduced, but bonding to fluororubber becomes difficult
Solution Approach 1:
The silane-modified fluororubber composition acts as an intermediary that bridges the bonding gap between the fluororesin barrier layer and the fluororubber layers. The silane groups provide bonding sites that facilitate adhesion to the fluororesin while the fluororubber matrix maintains flexibility and fuel resistance, making the manufacturing process easier.
Solution Approach 2:
By modifying the fluororubber composition with silane groups, the bonding parameters are improved to match the fluororesin surface characteristics. This parameter change increases bonding ease without requiring complex surface treatments or additional bonding agents, simplifying 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 solution ensures strong interlayer bonding and low fuel permeability, enhancing the durability and performance of the laminate in applications such as fuel hoses.
Implementation Method 1
a fluororubber (a1) having an absorption coefficient at 1720 cm−1, determined after being brought into contact with triethyl amine, of 0.35 or lower
Data Source
AI summary
The present invention aims to provide a laminate in which a fluororesin layer and a fluororubber layer are firmly bonded even when the fluororesin layer contains a fluororesin having excellently low fuel permeability. The present invention relates to a laminate including a fluororubber layer (A) and a fluororesin layer (B) stacked on the fluororubber layer (A). The fluororubber layer (A) is a layer formed from a fluororubber composition. The fluororubber composition contains a fluororubber (a1) and a basic multifunctional compound having at least two nitrogen atoms in the molecule with a distance between the nitrogen atoms in the molecule of 5.70 Å or greater. The fluororubber (a1) has an absorption coefficient at 1720 cm−1, determined after being brought into contact with triethyl amine, of 0.35 or lower. The fluororesin layer (B) is formed from a fluororesin (b1) having a fuel permeability coefficient of 2.0 g·mm/m2/day or lower.