Low-Density Epoxy Primer for Heavy Flash Rust Adhesion
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Solution Overview
Problem
Existing anti-corrosion coatings are inadequate for heavy flash rust surfaces, leading to poor adhesion, coating peeling, and reduced anti-corrosion ability, which affects the service life and aesthetics of steel components.
Innovation Solution
A low-density epoxy primer is developed using double-layer coated hollow glass microspheres and isocyanate prepolymers to enhance adhesion and anti-corrosion performance on heavy flash rust surfaces, incorporating a specific composition of components A and B, including epoxy resin, curing agents, and additives to improve compatibility and molecular cross-linking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing anti-corrosion coatings are applied to heavy flash rust surfaces, then the coating process is simple, but the adhesion is poor and coating peeling occurs
Solution Approach 1:
The patent introduces a specialized primer as an intermediary layer between the heavy flash rust surface and the topcoat. This primer contains specific additives and has modified molecular structure that enables it to bond effectively with the rusted surface while providing a stable base for subsequent coatings, thereby resolving the adhesion problem without complicating the overall coating process
Solution Approach 2:
The patent modifies the chemical and physical parameters of the coating system by adjusting the primer's molecular weight, cross-linking density, and compositional ratios. These parameter changes enable the coating to achieve optimal adhesion to heavy flash rust surfaces while maintaining ease of application and preventing coating peeling
2Ease of manufacture
If existing anti-corrosion coatings are applied to heavy flash rust surfaces, then the coating process is straightforward, but the anti-corrosion ability is reduced
Solution Approach 1:
The specialized primer acts as a mediator that creates a chemically stable interface between the corrosive rusted surface and the protective coating system. This intermediary layer prevents direct contact between corrosive substances and the metal substrate while providing excellent adhesion, thereby enhancing anti-corrosion ability without complicating the coating process
Solution Approach 2:
The patent employs a composite coating system consisting of multiple layers with different functional properties. The primer layer contains specific anti-corrosion additives and has a composite molecular structure that provides both adhesion and corrosion protection, while the topcoat provides additional protective functions, creating a synergistic effect that enhances overall anti-corrosion performance
3Ease of manufacture
If existing anti-corrosion coatings are applied to heavy flash rust surfaces, then the coating process is simple, but the service life is shortened
Solution Approach 1:
The specialized primer serves as a long-lasting intermediary layer that maintains stable adhesion to the heavy flash rust surface throughout the service life of the coating system. This primer layer prevents coating failure and peeling, thereby extending the service life of the entire coating system while keeping the application process simple
Solution Approach 2:
The patent applies the specialized primer as a preliminary step before applying the topcoat. This preliminary action creates a stable, adherent base layer that prevents subsequent coating failure and extends the service life of the coating system. The primer is designed to cure fully and provide long-term stability, ensuring that the entire coating system maintains its protective function throughout the service life
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 achieves high adhesion and excellent salt spray resistance on heavy flash rust surfaces, suitable for applications in ships, bridges, and steel structures, simplifying surface treatment processes and improving construction efficiency.
Implementation Method 1
incorporating a specific composition of components A and B, including epoxy resin, curing agents, and additives to improve compatibility and molecular cross-linking
Implementation Method 2
first silane coupling agent, and aluminum powder slurry
Data Source
AI summary
The present disclosure discloses a low-density anti-corrosion primer with strong adhesion to heavy flash rust surface and its preparation method, which relates to the field of paint chemical industry. The epoxy primer includes component A and component B; the component A includes epoxy resin, double-layer coated hollow glass microspheres, thixotropic agent, wetting dispersant, pigment, barium sulfate, talcum powder, solvent A, defoamer, first silane coupling agent, and aluminum powder slurry; the B component includes curing agent, promoter, and solvent B. The low-density epoxy primer of the present disclosure, which strongly adheres to heavy flash rust surface, has excellent adhesion and anti-corrosion performance on metal substrate surfaces treated by manual rust removal, mechanical rust removal, water sandblasting rust removal, and other methods. It has a high tolerance for the flash rust on the surface treated by water sandblasting rust removal and can be adapted to heavy flash rust surfaces.