Aqueous Epoxy Adhesive Storage Stability via Segmentation
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Solution Overview
Problem
Aqueous adhesion promoter compositions face challenges with low storage stability and adhesion loss under hot and humid conditions, particularly in one-component formulations, and existing two-component systems also suffer from adhesion loss over time.
Innovation Solution
An aqueous adhesion promoter composition incorporating dispersed solid epoxy resin, aminosilane, acid, amine hardener, and water, with the use of inorganic bases in two-component formulations or water-soluble carboxylic acids in one-component formulations to enhance stability and adhesion integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If aqueous adhesion promoter compositions are formulated as one-component compositions, then ease of operation is improved, but storage stability deteriorates
Solution Approach 1:
The invention divides the adhesion promoter into two separate components: Component A containing the epoxy resin and aminosilane, and Component B containing the amine hardener and inorganic base. This segmentation allows each component to be stored stably without premature reaction, while maintaining ease of operation through simple mixing before application.
Solution Approach 2:
The invention performs preliminary stabilization by incorporating an inorganic base (such as magnesium hydroxide or calcium hydroxide) into Component B, which prevents premature reaction of the aminosilane with the epoxy resin. This preliminary action enables long-term storage stability while allowing the components to be mixed just before application.
2Stability of the object's composition
If aqueous adhesion promoter compositions are formulated as two-component systems, then storage stability is improved, but device complexity increases
Solution Approach 1:
The invention segments the formulation into two components with distinct functions: Component A contains the reactive epoxy resin and aminosilane, while Component B contains the amine hardener and inorganic base. This segmentation provides storage stability by preventing premature reaction, and the complexity is managed through clear functional separation.
Solution Approach 2:
The inorganic base in Component B acts as an intermediary that controls the reaction between the epoxy resin and aminosilane. It prevents premature reaction during storage but allows controlled reaction upon mixing with Component A, thereby providing storage stability without excessive complexity.
3Reliability
If adhesion promoter compositions are used under hot and humid conditions, then adhesion performance is improved, but adhesion integrity deteriorates over time
Solution Approach 1:
The invention changes the chemical parameters of the composition by incorporating an inorganic base that modifies the reaction environment. This parameter change enables the composition to maintain adhesion integrity under hot and humid conditions by controlling the hydrolysis and condensation reactions of the silane groups.
Solution Approach 2:
The invention creates a composite system combining epoxy resin, aminosilane, amine hardener, and inorganic base. This composite material structure provides both adhesion performance and long-term integrity under demanding environmental conditions through synergistic interactions between the components.
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 high storage stability and maintains adhesion integrity under hot and humid conditions, with improved handling and user-friendliness in one-component formulations and enhanced stability in two-component systems.
Implementation Method 1
reactive constituents such as organosilanes, which react with one another and with the bond substrates and form a suitable interlayer for the adhesive
Implementation Method 2
the use of acids as additives in the adhesion promoter composition substantially increases its storage stability and, especially in conjunction with inorganic bases in two-component formulations
Implementation Method 3
The compositions are typically solutions or dispersions which are applied in liquid form before the solvent evaporates
Data Source
AI summary
An aqueous adhesion composition comprising: a) at least one dispersed solid epoxy resin (EP); b) at least one amino silane (AS); c) at least one acid (HS); d) at least one amine hardener (AH); and e) water. According to the invention, the adhesion compositions substantially improve, particularly under humid conditions, the adhesion on different substrates. The compositions are storage stable for a longer period of time and have, even after different aging states of the components, essentially no impairment in the action thereof.