Multilayer Coated Metal Plate Diffusion Layer Adhesion
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Solution Overview
Problem
Existing surface-treated metal plates with multilayer coatings face challenges in achieving strong interlayer adhesion between coating layers, which affects performance in corrosion resistance, workability, and appearance, due to differences in resin ingredients and surface energies between layers.
Innovation Solution
A surface-treated metal plate with a diffusion layer formed at the interface between coating layers, where the ingredients of the top and bottom layers are mixed, with a film thickness ratio of 0.2≦t/T≦0.8, and a total film thickness of 1.0 μm≦T≦20.0 μm, using water-based coatings with specific surface tension and viscosity differences to enhance interlayer adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer coating structure is used to divide functions among different coating layers, then corrosion resistance, solvent resistance, and scratch resistance are improved, but interlayer adhesion deteriorates due to differences in resin ingredients and surface energies
Solution Approach 1:
The patent introduces a specific intermediate layer between coating layers with different resin ingredients. This intermediate layer contains both carboxyl groups and hydroxyl groups that act as chemical bridges, forming strong bonds with adjacent layers while maintaining compatibility with different resin systems, thus resolving the adhesion problem in multilayer structures
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating layers by controlling the ratios of carboxyl groups to hydroxyl groups. By adjusting these chemical parameters, the coating maintains strong interlayer adhesion while preserving the functional differences between layers for corrosion and solvent resistance
2Adaptability or versatility
If different resin ingredients and additives are used in different coating layers to achieve specific functions, then functional performance is improved, but physical bonding force between layers deteriorates due to polarity and surface energy differences
Solution Approach 1:
The patent creates a composite coating structure where each layer contains a specific combination of resin ingredients, carboxyl groups, and hydroxyl groups. This composite approach allows each layer to maintain its unique functional properties while the chemical groups provide universal bonding capability across different material compositions
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 solution provides excellent interlayer adhesion and maintains the performance of both coating layers, improving corrosion resistance, workability, and appearance while being cost-effective and easily producible.
Implementation Method 1
a diffusion layer is formed at an interface part between a first coating layer as a top layer and a second coating layer directly under the first coating layer, wherein the ingredients of the first coating layer and the second coating layer are mixed in the diffusion layer
Data Source
AI summary
An easily and inexpensively producible surface-treated metal plate which uses a continuous coating facility for a surface-treated metal plate to provide at least two coating layers. A surface-treated metal plate comprised of a metal sheet on one surface or both surfaces of which two or more coating layers of different ingredients of formulation are provided, which surface-treated metal plate is characterized in that a diffusion layer is formed at an interface part between a first coating layer as a top layer and a second coating layer directly under the first coating layer, wherein the ingredients of the first coating layer and the second coating layer are mixed in the diffusion layer, and in that t/T is 0.2≦t/T≦0.8 where a film thickness of said diffusion layer is “t” and a total film thickness of said diffusion layer, said first coating layer, and said second coating layer is “T”.