Antifouling Coating Composition for Draft Sections
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Solution Overview
Problem
Existing antifouling coatings fail to maintain effective performance in draft sections of ships and structures submerged in seawater, where exposure to sunlight and repeated wet-dry cycles impair their durability and fouling prevention capabilities.
Innovation Solution
A copolymer-based antifouling coating composition incorporating a carboxylic acid silyl ester and monocarboxylic acid metal salt, specifically designed to provide long-lasting antifouling performance by stabilizing the coating film's dissolution rate even under sunlight exposure, comprising a copolymer A derived from triorganosilyl ester monomers, carboxylic acid silyl ester B with a triisopropylsilyl group, and monocarboxylic acid metal salt C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antifouling coating compositions are used, then antifouling performance is maintained in constantly submerged coating film sections, but antifouling performance deteriorates in draft sections exposed to sunlight and repeated wet-dry cycles
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating by incorporating specific silyl ester compounds (carboxylic acid silyl ester and monocarboxylic acid metal salt) that alter the dissolution behavior of the coating film. These parameter changes enable the coating to maintain stable dissolution rates and antifouling performance under harsh environmental conditions including sunlight exposure and wet-dry cycles in draft sections
Solution Approach 2:
The patent creates a composite coating system by combining copolymer A (with specific monomer composition including silyl-containing monomers), carboxylic acid silyl ester B, and monocarboxylic acid metal salt C. This composite material structure provides synergistic effects that enhance both the stability and antifouling performance of the coating in challenging environments
2Reliability
If the coating film dissolves quickly to provide antifouling agents, then antifouling performance is improved, but the duration of action is reduced
Solution Approach 1:
The patent implements a dynamic dissolution mechanism where the coating film gradually releases antifouling agents over time through controlled hydrolysis of silyl ester bonds. The dissolution rate is dynamically adjusted by the specific composition of silyl ester compounds, allowing the coating to maintain effective antifouling performance throughout its extended service life without rapid depletion of active ingredients
Solution Approach 2:
By changing the chemical parameters of the coating composition, specifically incorporating carboxylic acid silyl ester and monocarboxylic acid metal salt in optimized ratios, the patent achieves a balanced dissolution profile that provides sustained release of antifouling agents, extending the operational duration while maintaining effective protection
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 composition ensures sustained antifouling performance in draft sections by maintaining a stable dissolution rate and improved water resistance, preventing fouling organism adhesion and enhancing environmental safety.
Implementation Method 1
a carboxylic acid silyl ester B which is a silyl ester of a carboxylic acid other than an ethylenically unsaturated carboxylic acid and having triisopropylsilyl as a silyl group
Data Source
AI summary
The present invention provides a composition for form an antifouling coating film which continues to dissolve for a long time even after being exposed to sunlight for a long time and realizes a good antifouling performance even in the draft section, where adhesion of aquatic fouling organisms is easy to occur, and high environmental safety. According to the present invention, an antifouling coating composition, comprising: a copolymer A; a carboxylic acid silyl ester B; a monocarboxylic acid metal salt C; wherein: the copolymer A is obtained by copolymerizing a mixture of a monomer (a), a monomer (b) and an ethylenically unsaturated monomer (c); the monomer (a) is represented by general formula (1); the monomer (b) is represented by general formula (2); the carboxylic acid silyl ester B is a silyl ester of a carboxylic acid other than an ethylenically unsaturated carboxylic acid; is provided.