Aqueous Epoxy Primer Eliminates Chromate Corrosion Inhibitors
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Solution Overview
Problem
Existing primer compositions for adhesive bonding systems and coatings often rely on chromate-based corrosion inhibitors, which are environmentally and regulatory concerns, and require additional corrosion inhibitors, making them costly and complex to produce, while also facing challenges with organic solvent resistance and flexibility.
Innovation Solution
Aqueous-based primer composition comprising thermosetting, self-emulsifying epoxy resin and non-self-emulsifying resin with a curative, eliminating chromate components and reducing the need for additional corrosion inhibitors, forming a stable emulsion without organic solvents, enhancing cross-linking and mechanical properties like flexibility and UV-resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chromate-based corrosion inhibitors are used in primer compositions, then corrosion resistance is improved, but environmental compliance and regulatory acceptance deteriorate
Solution Approach 1:
The patent removes chromate-based corrosion inhibitors from the primer composition and replaces them with alternative corrosion inhibition mechanisms using non-chromate additives, thereby eliminating the harmful environmental substance while maintaining the essential corrosion protection function
Solution Approach 2:
The invention changes the chemical composition parameters of the corrosion inhibitors from chromate-based to alternative substances, fundamentally altering the chemical properties of the system to achieve both corrosion resistance and environmental compliance
2Object-affected harmful factors
If additional corrosion inhibitors are added to achieve chromate-free formulations, then environmental compliance is improved, but formulation complexity and production cost increase
Solution Approach 1:
The self-emulsifying epoxy resin composition performs multiple functions simultaneously: it provides the primary binding function of the primer while also incorporating built-in corrosion inhibition capabilities, thereby eliminating the need for separate corrosion inhibitor additives and simplifying the overall formulation
Solution Approach 2:
The invention merges the corrosion inhibition function with the primary resin binder by incorporating corrosion inhibiting additives directly into the self-emulsifying epoxy resin composition, creating a unified multi-functional material that reduces formulation complexity
3Ease of operation
If organic solvents are used in primer compositions, then application properties are improved, but solvent resistance and environmental compliance deteriorate
Solution Approach 1:
The invention changes the physical state and composition parameters of the carrier vehicle from organic solvent-based to water-based self-emulsifying system, fundamentally altering the solvent properties to achieve environmental compliance while maintaining application performance through the self-emulsifying mechanism
Solution Approach 2:
The patent replaces the organic solvent system with a water-based self-emulsifying system, substituting the chemical mechanism of organic solvent dissolution with the physical-chemical mechanism of self-emulsification in aqueous medium, thereby eliminating harmful organic solvents while preserving application properties
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 primer composition provides long-lasting corrosion resistance, flexibility, and resistance to organic solvents, simplifying production and adaptation for various applications without the need for chromate-based inhibitors, ensuring effective bonding and protection of metal surfaces.
Implementation Method 1
thermosetting, self-emulsifying epoxy resin composition
Implementation Method 2
enhancing cross-linking and mechanical properties
Data Source
AI summary
The present invention relates to aqueous-based primer composition, comprising at least one thermosetting, self-emulsifying epoxy resin composition; at least one thermosetting, non-self-emulsifying resin composition; water; and at least one curative.