Antifouling Coating Composition With Controlled Film Consumption
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Solution Overview
Problem
Conventional antifouling coating compositions containing silicone component-containing hydrolyzable polymers exhibit rapid consumption and insufficient durability, leading to increased repair frequency and costs due to poor adhesion to other coating films, necessitating removal and reapplication during maintenance.
Innovation Solution
An antifouling coating composition comprising a hydrolyzable copolymer with an organosiloxane block and metal ester group, combined with zinc oxide, which forms a film with balanced damage resistance, repairability, and appropriate consumption rate, enhancing adhesion to other coating films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicone component-containing hydrolyzable polymer is used in the antifouling coating composition, then the antifouling properties are improved through surface hydrophilization, but the consumption rate of the coating film becomes too rapid
Solution Approach 1:
The invention changes the chemical composition parameters of the polymer by incorporating both silicone components (for hydrophilization) and carboxylic acid components (for controlled consumption). Specifically, the polymer contains 1-50 mass% silicone component and 1-80 mass% carboxylic acid component, creating a balanced composition that achieves both excellent antifouling properties and appropriate consumption rate.
Solution Approach 2:
The invention uses a composite polymer structure combining silicone components and carboxylic acid components in a single polymer chain. This composite approach allows the polymer to exhibit both the hydrophilization effect of silicone and the controlled consumption characteristics of carboxylic acid groups, resolving the contradiction between antifouling performance and consumption rate.
2Duration of action of stationary object
If the antifouling coating film is applied with sufficient thickness to sustain long-term properties, then the antifouling duration is extended, but the repair complexity increases due to poor adhesion to other coating films
Solution Approach 1:
The invention modifies the chemical parameters of the polymer by introducing carboxylic acid components that enhance adhesion to metal substrates and other coating films. The carboxylic acid groups form strong chemical bonds with metal oxides and other polymer matrices, improving interlayer adhesion and facilitating easier repair even when thicker films are applied.
3Reliability
If the coating film is designed for rapid consumption to maintain excellent antifouling properties, then the antifouling effectiveness is enhanced, but the durability against substrate damage becomes insufficient
Solution Approach 1:
The invention creates a composite polymer system where silicone components provide hydrophilization for antifouling effectiveness, while carboxylic acid components contribute to film integrity and substrate adhesion. This composite structure balances the rapid consumption characteristic with sufficient durability, allowing the film to renew effectively while maintaining structural strength.
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 extends the lifespan of the antifouling coating film, reduces repair time and costs by ensuring excellent adhesion to other films, and maintains effective antifouling properties over a longer period.
Implementation Method 1
an antifouling coating film containing a hydrolyzable polymer exhibits antifouling properties in (sea)water, by a surface of the antifouling coating film being hydrophilized as the hydrolysis of the polymer progresses
Implementation Method 2
An antifouling coating composition comprising a hydrolyzable copolymer with an organosiloxane block and metal ester group, combined with zinc oxide
Implementation Method 3
the adjustment of the hydrophilicity and water repellency of the hydrolyzable polymer is considered, and as an example of the adjustment, a method of introducing a silicone (polyorganosiloxane) component into the polymer is studied
Data Source
AI summary
An embodiment of the present invention relates to an antifouling coating composition, an antifouling coating film, a substrate with an antifouling coating film or a method for producing the same, an antifouling method for a substrate, or a method for repairing a substrate with an antifouling coating film. The antifouling coating composition includes a hydrolyzable copolymer (A) containing an organosiloxane block and a metal ester group, and zinc oxide (B). The copolymer (A) contains 5 to 25% by mass of a constituent unit derived from a metal ester group-containing monomer, 5 to 15% by mass of a constituent unit derived from a monomer represented by the formula (2), and a constituent unit derived from a monomer represented by the formula (3). The content of (B) relative to 100 parts by mass of the content of (A) is 70 to 200 parts by mass. [wherein R1 to R3 each independently represent a monovalent hydrocarbon group, X independently represent a (meth)acryloyloxyalkyl group or a mercaptoalkyl group, m is 1 or greater, n is 0 or greater, p and q are independently 0 or 1, and n + p + q is 1 or greater]. [wherein R41 represents a monovalent group including an ethylenically unsaturated group, and R42 represents a monovalent hydrocarbon group with 3 to 6 carbon atoms being free of an ethylenically unsaturated group].