Antifouling Coating Composition Adhesion to Epoxy Resin
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Solution Overview
Problem
Existing antifouling coatings for epoxy resin-based substrates face challenges with adhesion and long-term performance, particularly due to the need for a vinyl resin-based binder intermediate coat, which increases VOC emissions and complicates the coating process, and requires short intervals between application steps, limiting practicality in shipbuilding and maintenance.
Innovation Solution
An antifouling coating composition incorporating a specific silyl methacrylic resin, cuprous oxide with a specific particle size, and a rosin or monocarboxylic acid compound, which reduces VOC and ensures stable adhesion to epoxy resin-based coatings over extended periods without the need for a vinyl resin-based binder, allowing for extended intervals between coating applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a vinyl resin-based binder intermediate coat is applied to ensure adhesion of antifouling paint to epoxy resin-based coating film, then adhesion is improved, but VOC emissions increase and device complexity increases
Solution Approach 1:
The invention extracts and eliminates the vinyl resin-based binder intermediate coat from the coating system. By developing a novel antifouling paint formulation that can directly adhere to epoxy resin-based coating films, the patent removes the intermediate layer that was responsible for high VOC emissions, thereby resolving the contradiction between achieving adhesion and reducing harmful emissions
Solution Approach 2:
The invention employs a composite binder system comprising polyester resin and acrylic resin in specific proportions (polyester resin: 30-70 wt%, acrylic resin: 70-30 wt%). This composite material formulation provides both adequate adhesion to epoxy substrates and reduced VOC emissions, eliminating the need for vinyl resin-based intermediates while maintaining coating performance
2Strength
If a vinyl resin-based binder intermediate coat is applied to ensure adhesion, then adhesion is improved, but device complexity and coating process complexity increase
Solution Approach 1:
The invention removes the intermediate vinyl resin-based binder layer from the coating system, simplifying the coating process from multiple layers (epoxy primer + vinyl intermediate + antifouling topcoat) to a simpler structure (epoxy primer + antifouling topcoat). This extraction eliminates the complexity of applying and drying intermediate layers while maintaining adhesion through the novel binder formulation
Solution Approach 2:
The novel antifouling paint formulation achieves multi-functionality by combining adhesion promotion, corrosion protection, and antifouling properties in a single coating layer. The binder system and cuprous oxide pigment work together to provide both bonding to the epoxy substrate and biological fouling resistance, eliminating the need for separate intermediate and topcoat layers
3Strength
If short intervals between coating applications are used to ensure adhesion, then adhesion is improved, but productivity decreases
Solution Approach 1:
The invention incorporates adhesion promoters and surface preparation agents within the paint formulation itself, allowing the coating to adhere effectively even when applied after longer intervals. The polyester-acrylic binder system maintains its bonding capability over extended periods, eliminating the urgency to apply subsequent coats within short time windows and thereby improving施工 productivity
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 long-term antifouling performance, water resistance, and adhesion to epoxy resin-based coatings, reducing VOC emissions and simplifying the coating process by eliminating the need for a vinyl resin-based binder, while maintaining excellent adhesion and fouling resistance.
Implementation Method 1
antifouling coating compositions which contain a hydrolyzable resin as a resin component (a binder component)
Implementation Method 2
antifouling coating compositions that include a coating composition which includes a hydrolyzable resin containing a triorganosilyl group or a metal such as zinc, in combination with cuprous oxide
Data Source
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AI summary
To provide an antifouling coating composition which not only has long-term antifouling properties and long-term properties but also exhibits excellent adhesion over a long period. [Solution] An antifouling coating composition of the invention includes (A) a hydrolyzable copolymer including a structural unit (1) derived from triisopropylsilyl methacrylate (i), a structural unit (2) derived from 2-methoxyethyl (meth) acrylate (ii), and a structural unit (3) derived from a polymerizable monomer (iii) having a polymerizable double bond (with the proviso that triisopropylsilyl methacrylate and 2-methoxyethyl (meth) acrylate are excluded), (B) cuprous oxide having an average particle size of 4.5 to 50 µm, and (C) a rosin and/or a monocarboxylic acid compound.