Fuel Cell Laminate Adhesion for Hot-Water-Resistant Metal Bonding
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Solution Overview
Problem
Conventional adhesive assemblies for fuel cells experience a significant decrease in adhesive force in the presence of hot water due to water infiltration at the adhesion interface, particularly when using low-polarity metal members.
Innovation Solution
An assembly for fuel cells comprising an adhesive resin layer containing polyolefin with acidic or acid anhydride groups and a specific acid value, bonded with metal members having a controlled dipole term in surface free energy, and a laminated body with an easily adhesive layer to enhance adhesion in hot water conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive compositions containing acid-modified polyolefin are used to bond metal members, then adhesive strength is improved, but water infiltration at the adhesion interface promotes peeling and decreases adhesive force in the presence of water
Solution Approach 1:
The patent changes the chemical parameters of the adhesive composition by incorporating specific components (epoxy resin, silane coupling agent, and metal chelate) with controlled ratios. The acid value is precisely controlled within 1.0-20.0 mg KOH/g, and the composition includes epoxy resin (0.1-50 parts by mass per 100 parts acid-modified polyolefin), silane coupling agent (0.1-10 parts), and metal chelate (0.1-10 parts). These parameter changes create a multi-functional adhesive system that resists water infiltration while maintaining strong adhesion.
Solution Approach 2:
The patent creates a composite adhesive material by combining acid-modified polyolefin with epoxy resin, silane coupling agent, and metal chelate. This composite formulation leverages the complementary properties of each component: the polyolefin provides base adhesion, epoxy resin enhances chemical bonding, silane coupling agent strengthens interface bonding, and metal chelate prevents water infiltration. The synergistic combination resolves the contradiction between initial adhesive strength and long-term water resistance.
2Ease of manufacture
If adhesive assemblies are used with low-polarity metal members, then manufacturing simplicity is improved, but adhesive force significantly decreases in the presence of hot water
Solution Approach 1:
The patent introduces silane coupling agent and metal chelate as intermediary substances that mediate between the adhesive and low-polarity metal surfaces. The silane coupling agent forms strong chemical bonds with metal surfaces through siloxane linkages, while the metal chelate creates coordination complexes with metal ions. These intermediaries enable effective adhesion to low-polarity metals without requiring complex surface treatments, maintaining manufacturing simplicity while ensuring hot water resistance.
Solution Approach 2:
The patent modifies the adhesive composition parameters to specifically address low-polarity metal surfaces. The inclusion of epoxy resin (0.1-50 parts per 100 parts acid-modified polyolefin) and controlled acid value (1.0-20.0 mg KOH/g) creates chemical groups that can interact with low-polarity surfaces. The silane coupling agent (0.1-10 parts) and metal chelate (0.1-10 parts) further enhance compatibility with low-polarity metals, enabling reliable bonding without complex surface preparation.
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 assembly maintains excellent adhesive force in the presence of hot water, reducing water infiltration and ensuring durable bonding between metal and resin layers.
Implementation Method 1
an adhesive resin layer containing a polyolefin having at least one group selected from the group consisting of an acidic group and an acid anhydride group and having an acid value of 0.01 mgKOH/g to 6.5 mgKOH/g; and two or more members bonded with the adhesive resin layer interposed therebetween
Data Source
AI summary
The invention provides an assembly for fuel cell which has an excellent adhesive force in the presence of hot water, and a laminated body which is used for the assembly for fuel cell. The assembly for fuel cell comprises an adhesive resin layer containing a polyolefin having at least one group selected from the group consisting of an acidic group and an acid anhydride group and having an acid value of 0.01 mgKOH/g to 6.5 mgKOH/g; and two or more members bonded with the adhesive resin layer interposed therebetween, wherein at least one of the members is a metal member having a ratio of a dipole term in surface free energy of 0.01% to 5.0%.