Structural Epoxy Adhesive Curing for Strong Bonds and Easy Application
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Solution Overview
Problem
Existing structural adhesives face challenges in providing sufficient bond strength and ease of application for bonding substrate materials, particularly in automotive and industrial applications.
Innovation Solution
An adhesive composition comprising an epoxy-containing component, rubber particles with a core-shell structure, and a curing component formed from an amine-containing compound and a polymeric phenol-containing compound, which react upon activation by an external energy source, such as heat, to form a strong bond between substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a curing component comprising a mixture of tertiary amine-containing compound with hydroxyl functional groups and polymeric phenol-containing compound is used, then the adhesive can chemically react with epoxy-containing component, but the bond strength and ease of application are insufficient
Solution Approach 1:
The curing component is segmented into two distinct parts: an amine-containing compound substantially free of hydroxyl functional groups and a polymeric phenol-containing compound. These components are mixed to form an ion pair that remains stable during application but decomposes under external energy activation to provide effective curing. This segmentation allows the adhesive to maintain stability during application while achieving strong bonds after curing.
Solution Approach 2:
The invention changes the chemical parameters of the curing component by using an amine-containing compound substantially free of hydroxyl functional groups combined with a polymeric phenol-containing compound. This parameter change creates an ion pair with specific properties that decompose under external energy activation, providing both ease of application and strong bond strength.
2Strength
If the amine-containing compound comprises primary and/or secondary amino groups and forms an ion pair with polymeric phenol-containing compound, then the adhesive provides improved mechanical properties, but the curing process requires external energy activation
Solution Approach 1:
The amine-containing compound and polymeric phenol-containing compound are preliminarily combined to form a stable ion pair that can be easily applied. This preliminary action allows the adhesive to be applied without premature curing, and the curing reaction is activated only when external energy is applied, providing control over the timing and location of bond formation.
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 adhesive composition provides improved mechanical properties such as lap shear and T-peel strength, and the adhesive composition is easy to apply, forming strong bonds between substrates.
Implementation Method 1
the ion pair, complex, or adduct formed from the mixture decomposes and the amine-containing compound and the polymeric phenol-containing compound chemically react with the epoxy-containing component upon activation from an external energy source
Implementation Method 2
the amine-containing compound and the polymeric phenol-containing compound chemically react with the epoxy-containing component
Implementation Method 3
upon activation from an external energy source
Data Source
AI summary
An adhesive composition is disclosed. The adhesive composition comprises an epoxy-containing component; rubber particles having a core-shell structure; and a curing component comprising a mixture of an amine-containing compound substantially free of hydroxyl functional groups and a polymeric phenol-containing compound, wherein the amine-containing compound comprises primary and/or secondary amino groups, and wherein the curing component chemically reacts with the epoxy-containing component upon activation from an external energy source. Also disclosed are methods of preparing the adhesive composition and for forming a bonded substrate with the adhesive composition. Further disclosed are curing components for an adhesive composition and methods of making the curing components.