Electrodepositable Acrylic Coatings for Sharp-Edge Corrosion Resistance
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Solution Overview
Problem
Existing electrodeposition coating compositions exhibit poor edge coverage and tend to pull away from sharp edges, leading to early and severe corrosion.
Innovation Solution
An electrodepositable coating composition comprising an acrylic polymer with greater than 60% by weight of hydroxyl-functional (meth)acrylate or (meth)acrylamide monomer units and an ionic salt group-containing film-forming polymer, where the acrylic polymer is a single-stage polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrodeposition coating compositions are used, then the coating process is simple and cost-effective, but the edge coverage is poor and coating pulls away from sharp edges
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating formulation by incorporating specific additives and adjusting the ratio of binding agents, solvents, and functional components to improve wetting and adhesion at edge areas without compromising the overall coating process simplicity
Solution Approach 2:
The patent introduces intermediary substances such as surfactants and adhesion promoters that act as mediators between the coating and the substrate at edge areas, enhancing the coating's ability to adhere to sharp edges and preventing pull-away during the electrodeposition process
2Manufacturing precision
If the coating is applied to sharp edges, then complete coverage is desired, but the coating pulls away due to increased surface energy
Solution Approach 1:
The patent adjusts surface energy parameters of the coating formulation by incorporating specific surfactants and modifying the chemical composition to reduce surface tension, enabling the coating to maintain adhesion on high surface energy areas such as sharp edges
Solution Approach 2:
The patent incorporates adhesion promoters and surface modifiers in the coating formulation that preliminarily prepare the coating to interact favorably with sharp edges before deposition, ensuring proper wetting and bonding during the electrodeposition process
3Productivity
If thin coating is deposited on edges, then the coating process is efficient, but corrosion resistance is severely compromised
Solution Approach 1:
The patent modifies the electrodepositable coating formulation to include corrosion inhibitors and enhanced binding agents that provide superior corrosion protection even at reduced film thickness, allowing efficient coating deposition while maintaining reliability
Solution Approach 2:
The patent creates a composite coating system combining multiple functional components including corrosion inhibitors, adhesion promoters, and binding agents in specific ratios to achieve both thin film deposition efficiency and enhanced corrosion resistance at edge areas
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
Improves edge coverage and prevents coating pull-away, resulting in enhanced corrosion resistance and smoothness.
Implementation Method 1
electrophoretically applying coating deposited from an electrodepositable coating composition
Implementation Method 2
Electrodeposition as a coating application method involves the deposition of a film-forming composition onto a conductive substrate under the influence of an applied electrical potential
Data Source
AI summary
The present invention is directed to an electrodepositable coating composition comprising an acrylic polymer comprising greater than 60% by weight of constitutional units comprising the residue of a hydroxyl-functional (meth)acrylate monomer and/or a hydroxyl-functional (meth)acrylamide monomer, based on the total weight of the acrylic polymer; and an ionic salt group-containing film-forming polymer different from the acrylic polymer. Also disclosed are coatings, coated substrates, and methods of coating a substrate.