Aqueous Epoxy Primer Adhesion via Silane and Carbon Black
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Solution Overview
Problem
Two-component aqueous epoxy resin primer compositions used as primers for moisture-curing polyurethane adhesives often exhibit insufficient adhesion, especially after cataplasmic storage, due to the challenges of formulating solvent-free systems and maintaining adhesion performance.
Innovation Solution
Incorporating carbon black and/or specific silanes such as epoxysilane, aminosilane, and mercaptosilane into the two- or multi-component aqueous primer compositions, which include a combination of epoxy resin and polyamine components, to enhance adhesion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-component aqueous epoxy resin primer compositions are used as primers for moisture-curing polyurethane adhesives, then adhesion improvement is achieved, but adhesion becomes insufficient after cataplasmic storage
Solution Approach 1:
The patent applies composite materials by combining epoxy resin with silane compounds (such as aminosilane, epoxysilane, or mercaptosilane) to create a hybrid primer system. This composite approach integrates the adhesion benefits of epoxy resin with the moisture-curing and storage stability properties of silane compounds, resulting in a primer that maintains strong adhesion even after cataplasmic storage conditions.
Solution Approach 2:
The patent modifies the chemical composition parameters of the primer by incorporating specific silane compounds with controlled amounts (typically 0.1-5% by weight). This parameter change transforms the primer's chemical structure to enable both immediate adhesion performance and long-term stability after storage, resolving the contradiction between initial adhesion and stored adhesion.
2Object-affected harmful factors
If solvent-free primer systems are formulated to meet VOC regulations, then industrial hygiene and hazard aspects are improved, but formulation difficulty increases
Solution Approach 1:
The patent uses silane compounds as intermediary substances that enable solvent-free formulation. These silane compounds act as mediators that facilitate proper primer composition and performance without requiring volatile organic solvents, thus meeting VOC regulations while maintaining manageable formulation processes through their reactive functional groups.
Solution Approach 2:
By creating a composite system of epoxy resin and silane compounds, the patent achieves solvent-free formulation that is both environmentally compliant and formulation-friendly. The synergistic interaction between these components provides self-regulating properties that simplify the overall formulation process despite the absence of solvents.
3Reliability
If carbon black and silane compounds are added to primer compositions, then adhesion after cataplasm storage is greatly improved, but composition complexity increases
Solution Approach 1:
The patent employs silane compounds that serve multiple functions simultaneously: they provide adhesion enhancement, enable moisture-curing, improve storage stability, and contribute to the overall primer performance. This multi-functionality reduces the need for multiple separate additives, thereby managing composition complexity while achieving superior adhesion after cataplasm storage.
Solution Approach 2:
The patent merges the functions of adhesion promotion and storage stabilization into a single integrated system by combining epoxy resin with silane compounds. This consolidation of functions into a unified composition reduces the number of separate components needed, managing complexity while achieving the desired adhesion performance.
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 addition of these components significantly improves the adhesion of moisture-curing polyurethane adhesives, extending pot life and maintaining adhesion performance even after prolonged storage, while avoiding the use of solvents and VOCs.
Implementation Method 1
the adhesion is greatly improved by the addition of carbon black and/or epoxysilane and/or epoxysiloxane and/or aminosilane and/or aminosiloxane and/or mercaptosilane
Implementation Method 2
Two-component aqueous compositions consisting of an epoxy resin component and a polyamine component
Implementation Method 3
These epoxy resin primer compositions are based on epoxy resins and are one-component and typically contain solvents. Typically, these primers cure physically by forming a polymer film through the evaporation of the solvent.
Data Source
AI summary
The invention relates to two-component or multicomponent aqueous epoxy resin primer compositions comprising a first component, a second component, and an optional other component. The first component contains at least water and an epoxy resin while the second component contains at least one polyamine. The composition also comprises soot and/or epoxy silane ES and/or epoxy siloxane ESx and/or an amino silane AS and/or an amino siloxane ASx and/or mercaptosilane MS. The aqueous epoxy resin primer compositions improve adhesion of moisture-curing polyurethane adhesives or sealants on various bases.