One-Component Structural Adhesive With Latent Curing
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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
A one-component adhesive composition comprising an epoxy compound and a polymeric or monomeric compound with aminimide functional groups that react upon activation by an external energy source, with specific weight percentages and reaction products, including core-shell rubber particles and secondary latent curing catalysts, to enhance bond strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If structural adhesives are designed to provide sufficient bond strength, then the adhesive performance is improved, but the composition complexity and difficulty of application increase
Solution Approach 1:
The patent combines multiple functional components (epoxy compound, aminimide compound, rubber particles, curing catalyst) into a single one-component adhesive composition that maintains simplicity while achieving high bond strength through synergistic interactions between components
Solution Approach 2:
The adhesive uses composite material formulation combining epoxy resin with rubber particles (5-50 wt%) and aminimide compounds to achieve both high strength and enhanced toughness, resolving the contradiction between strength and composition simplicity
2Strength
If the adhesive composition includes multiple reactive components, then the bond strength is improved, but the ease of application deteriorates
Solution Approach 1:
Multiple functional components are merged into a single pre-formulated one-component adhesive that requires no mixing or precise ratio control during application, maintaining ease of use while achieving high bond strength through the synergistic combination of epoxy compound, aminimide compound, and rubber particles
Solution Approach 2:
The adhesive composition is designed to be self-curing through the interaction of embedded components (epoxy + aminimide + catalyst), eliminating the need for external mixing or additional curing agents during application
3Stability of the object's composition
If the adhesive is designed for high stability, then the storage performance is improved, but the reaction efficiency upon activation may be reduced
Solution Approach 1:
The patent uses latent curing catalysts that remain inactive during storage but activate upon heating or other stimuli, maintaining compositional stability during storage while ensuring efficient reaction and bond formation when activated
Solution Approach 2:
The adhesive components are pre-positioned in a stable, inactive state during storage, with the curing reaction deferred until activation by external energy (heat, UV), ensuring both long-term stability and subsequent reaction efficiency
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 achieves improved stability and mechanical properties, such as increased lap shear strength, while maintaining ease of application and suitability for various substrate materials.
Implementation Method 1
the epoxy, the aminimide-containing compound, and the reaction product react upon activation by an external energy source
Data Source
AI summary
An adhesive composition comprising an epoxy compound and a compound comprising at least one aminimide functional group is disclosed. The compound comprising the at least one aminimide functional group is present in an amount from 2-8% by weight based on total weight of the adhesive composition and reacts with the epoxy compound upon activation by an external energy source. The adhesive composition also may comprise an amidine salt.