Epoxy Elastomer Adhesive for Dissimilar Metal Bonding
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Solution Overview
Problem
Existing adhesives face challenges in providing simultaneous improvements in strain to failure, adhesion durability, and tensile modulus while maintaining performance across varying temperatures and environments, especially when bonding dissimilar materials like steel and aluminum, which are prone to delamination and corrosion.
Innovation Solution
A material comprising an epoxy/elastomer adduct, polymeric particles, an epoxy/diacid adduct, and an amine reaction product, with specific ratios and components such as bisphenol-F diglycidyl ether epoxy, silane-modified epoxy resin, and core/shell rubber particles, which enhances strain to failure, adhesion, and durability while maintaining a consistent tensile modulus and resistance to environmental stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional welding processes are used to bond dissimilar materials, then strong bonds can be achieved, but the process becomes complex and incompatible with certain material combinations
Solution Approach 1:
The patent modifies the chemical parameters of the adhesive formulation by incorporating specific additives and modifiers that enable the adhesive to bond dissimilar materials (steel, aluminum, composites) effectively, replacing complex mechanical fastening systems with a simplified adhesive bonding process
Solution Approach 2:
The adhesive acts as an intermediary material between dissimilar substrates, providing chemical compatibility and mechanical coupling that eliminates the need for complex welding or mechanical fastening systems
2Device complexity
If adhesives are used to bond dissimilar materials, then welding complexity is reduced, but delamination and warpage occur due to thermal expansion differences
Solution Approach 1:
The adhesive formulation includes specific modifiers and additives that adjust the thermal and mechanical parameters of the cured adhesive, enabling it to accommodate differential thermal expansion between dissimilar materials and prevent delamination and warpage
Solution Approach 2:
The adhesive is formulated as a composite material containing multiple components including polymer matrices, fillers, and functional additives that work together to provide both structural integrity and thermal compliance for bonding dissimilar materials
3Reliability
If adhesive formulation is optimized for strain to failure, then adhesion durability improves, but tensile modulus decreases
Solution Approach 1:
The patent carefully balances the chemical composition and crosslink density of the adhesive to achieve an optimal parameter set that provides both high strain to failure for adhesion durability and sufficient tensile modulus for structural strength
Solution Approach 2:
The adhesive formulation incorporates different functional components at specific concentrations to create local property variations that simultaneously enhance adhesion durability through increased strain capacity and maintain structural integrity through appropriate stiffness
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 material achieves improved strain to failure, adhesion durability, and tensile modulus, with T-peel strength and lap shear strength enhanced, and maintains performance across a wide temperature range, reducing delamination and corrosion issues in bonding dissimilar materials.
Implementation Method 1
an epoxy/elastomer adduct, a polymeric particle, from about 0.05 to about 20 weight percent of an epoxy/diacid adduct, and optionally, an amine reaction product
Data Source
AI summary
A material comprising an epoxy/elastomer adduct, a polymeric particle, from about 0.05 to about 20 weight percent of an epoxy/diacid adduct, and optionally, an amine reaction product.