Siloxane-Modified Carbodiimide Coatings for Edge Adhesion
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Solution Overview
Problem
Existing coatings often flow over the edges and corners of substrates, resulting in low film build and inadequate adhesion, leading to diminished protective and decorative properties in these areas.
Innovation Solution
The use of multi-unit carbodiimides modified by siloxane compounds as a surface coating, which can be chemically interacted with an overcoat containing acid functional or hydroxyl groups, improves overcoat uniformity and adhesion to the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coatings are applied to substrates, then the coating can be formed across the entire surface, but the coating flows over edges and corners resulting in low film build and inadequate adhesion
Solution Approach 1:
The patent applies a silane-based primer coating specifically to edges and corners where adhesion problems occur, rather than treating the entire substrate uniformly. This localized treatment provides enhanced adhesion and film build precisely where needed, resolving the contradiction between uniformity and adhesion by targeting quality improvements to problem areas.
Solution Approach 2:
The patent uses a composite coating system consisting of a silane-based primer layer combined with a subsequent coating layer. The silane primer provides specific adhesion-promoting properties at the substrate interface, while the overcoat provides protective and decorative functions. This composite approach allows each layer to optimize for its specific function, achieving both uniform film build and reliable adhesion.
2Area of stationary object
If coating compositions flow over edges and corners, then complete surface coverage is achieved, but film build and adhesion are reduced in these areas
Solution Approach 1:
The silane-based primer is specifically applied to edges and corners to provide localized enhancement of film build and adhesion properties. This targeted approach maintains complete surface coverage while ensuring that problematic areas receive additional functional benefits from the silane chemistry, which promotes better wetting and bonding at geometric features.
Solution Approach 2:
The patent changes the chemical parameters of the coating composition by introducing silane-based compounds with specific functional groups that enhance edge coverage and film build. The silane groups undergo hydrolysis and condensation reactions to form crosslinked networks that improve the coating's ability to adhere and maintain film integrity at edges and corners.
3Ease of manufacture
If conventional coatings are used, then application process is simple, but adhesion to substrate is inadequate causing coating to pull away
Solution Approach 1:
The silane-based primer acts as an intermediary layer between the substrate and the subsequent coating. The silane groups chemically interact with both the substrate surface and the overcoat, creating strong interfacial bonding. This intermediary layer resolves the adhesion problem while maintaining a relatively simple multi-step application process.
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating silane-based compounds that undergo specific chemical reactions (hydrolysis and condensation) to form crosslinked adhesion-promoting networks. These parameter changes enhance adhesion reliability without significantly complicating the manufacturing process, as the silane chemistry occurs during the normal coating application and curing sequence.
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
Enhances the uniformity and adhesion of the overcoat, particularly at edges and corners, providing improved corrosion resistance and overall coating performance.
Implementation Method 1
an overcoat layer disposed on the surface coating and chemically bonded to the surface coating through an acid functionalized or hydroxyl group of the overcoat layer
Implementation Method 2
contacting at least a portion of the substrate with a surface coating comprising a multi-unit carbodiimide
Data Source
AI summary
Coated substrates and methods may comprise a multi-unit carbodiimide. The multi-unit carbodiimide may also be combined with a siloxane. The multi-unit carbodiimide and/or the siloxane may be used in a surface coating applied to a substrate, and an overcoat may be applied to the surface coating. The surface coating may chemically interact with the overcoat and/or the substrate to improve corrosion resistance and other properties of the coated substrate.