Epoxy Coating Composition with Elastomeric Particles for Strong Bonds
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Solution Overview
Problem
Existing epoxy-based adhesive compositions lack sufficient bond strength and are difficult to apply effectively for bonding substrate materials.
Innovation Solution
A one-component composition comprising an epoxy-containing component, elastomeric particles with a styrene butadiene core, and a curing component activatable by an external energy source, such as guanidine, which is used to form coatings, sealants, or adhesives with enhanced bond strength and ease of application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional epoxy-based adhesive compositions are used, then the composition can be applied to substrates, but the bond strength is insufficient
Solution Approach 1:
The patent combines epoxy resin with elastomeric particles (specifically core-shell rubber particles with polystyrene core and polybutadiene shell) to create a composite adhesive material. This composite structure provides both the strength from the epoxy matrix and the toughness from the elastomeric particles, resolving the contradiction between bond strength and bond integrity. The elastomeric particles act as stress concentrators that initiate crazing and void formation, which blunts crack propagation and maintains bond integrity under stress.
2Ease of operation
If epoxy-based adhesive compositions are used, then bonding can be achieved, but the composition is difficult to apply effectively
Solution Approach 1:
The patent modifies the physical and chemical parameters of the epoxy system by incorporating elastomeric particles and using a two-stage curing mechanism (initial set followed by complete cure). This creates a composition that has adequate open time and workability for application, then develops full strength during curing, thereby improving ease of application without sacrificing bonding performance.
3Strength
If elastomeric particles are added to improve bond strength, then lap shear strength increases, but the composition becomes more complex
Solution Approach 1:
The patent uses a specific type of core-shell rubber particle where the polystyrene core provides structural integrity and the polybutadiene shell provides elasticity and adhesion. This well-defined composite structure with controlled particle morphology (average diameter 0.5-2.0 μm) achieves high lap shear strength (greater than 30.0 MPa) while maintaining manageable composition complexity through standardized particle design.
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 composition provides strong bonds with improved lap shear strength and ease of application, maintaining bond integrity under varying environmental conditions.
Implementation Method 1
a curing component activatable by an external energy source, the curing component comprising at least one guanidine
Data Source
Figure 1
AI summary
Disclosed herein is a composition comprising: an epoxy-containing component, elastomeric particles in an amount of greater than 11% by weight to 25% by weight based on total weight of the composition; and a curing component activatable by an external energy source, the curing component comprising at least one guanidine having a D90 particle size of 25 μm measured by dynamic light scattering. Also disclosed is the composition in an at least partially cured state. Also disclosed is a method for treating a substrate comprising applying the composition to a surface of a substrate; and applying an external energy source to cure the composition. Also disclosed are substrates comprising the composition. Also disclosed are substrates formed by the method of the present invention.