Curable Coating Composition for Stable High-Strength Structural Bonding
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Solution Overview
Problem
Existing curable compositions lack sufficient bond strength and stability, particularly in one-component systems that require activation by external energy sources, and often contain reactive functional groups that can lead to unwanted reactions at ambient conditions.
Innovation Solution
A curable composition comprising an epoxide-functional polymer, a curing agent activatable by an external energy source, and a fluoropolymer free of reactive functional groups, forming structural adhesives with high bond strength through a controlled curing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a curable composition uses reactive functional groups to achieve bond strength, then adhesion capability is improved, but unwanted reactions at ambient conditions occur leading to reduced stability
Solution Approach 1:
The patent extracts the reactive functional groups from the fluoropolymer component, creating a fluoropolymer that is substantially free of reactive functional groups. This separation allows the curable polymer to provide bonding strength through its curing reaction while the fluoropolymer contributes stability and other properties without participating in unwanted ambient reactions.
Solution Approach 2:
The patent changes the chemical parameter of the fluoropolymer by removing or minimizing reactive functional groups, transforming it from a reactive component to a stable, inert component. This parameter change resolves the contradiction by allowing the system to achieve bond strength through the curable polymer while the fluoropolymer maintains composition stability.
2Ease of operation
If a one-component curable composition is designed for simplicity, then ease of operation is improved, but sufficient bond strength and stability are not achieved
Solution Approach 1:
The patent merges multiple functional components into a single one-component composition: the curable polymer provides bonding strength through curing, the fluoropolymer contributes stability and environmental resistance, and the composition remains ready-to-use without mixing. This consolidation achieves both ease of operation and sufficient bond strength.
Solution Approach 2:
The single composition performs multiple functions simultaneously: the curable polymer enables adhesion and bond strength development, the fluoropolymer provides chemical stability and environmental resistance, and the unified formulation ensures ease of application. This multi-functionality in one component resolves the contradiction between simplicity and performance.
3Duration of action of moving object
If a curable composition uses traditional curing agents, then curing capability is achieved, but green strength remains insufficient
Solution Approach 1:
The patent changes the physical parameter of the composition by incorporating a fluoropolymer that modifies the rheological and mechanical properties of the uncured composition. This parameter change enhances green strength while maintaining the curing capability of the curing agent, allowing the composition to exhibit sufficient strength before full curing occurs.
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 achieves strong, stable bonds with green strength of at least 0.5 MPa and structural adhesive strength of over 15.0 MPa, maintaining integrity under varying conditions.
Implementation Method 1
a curing agent capable of reacting with the epoxide-functional polymer
Implementation Method 2
a curing agent capable of reacting with the epoxide-functional polymer that is activatable by an external energy source
Data Source
AI summary
Disclosed herein are curable compositions comprising an epoxide-functional polymer, a curing agent capable of reacting with the epoxide-functional polymer that is activatable by an external energy source, and a fluoropolymer that is substantially free of a reactive functional group. The epoxide-functional polymer may be a solid epoxide-functional polyurethane comprising a di-isocyanate. Also disclosed are articles comprising one of the compositions in an at least partially cured state positioned between first and second substrates. Also disclosed are methods of forming an adhesive on a substrate.