Antifouling Coating Composition with Stable Film Dissolution
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Solution Overview
Problem
Conventional hydrolysable self-polishing antifouling coatings fail to maintain stable film dissolution speed and antifouling performance over a long period, often resulting in defects such as cracks in the coating film.
Innovation Solution
An antifouling coating composition comprising a polyester urethane resin obtained by urethanization reaction of a polyester polyol with a specific structure and an antifouling agent, which maintains stable film dissolution speed and prevents defects like cracks in the coating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrolysable self-polishing antifouling coatings use polyester resin that dissolves in seawater, then initial antifouling effect is achieved, but long-term antifouling performance deteriorates due to unstable film dissolution speed and coating film defects
Solution Approach 1:
The patent uses a copolymer consisting of a polyester unit and a polyether unit, combining the hydrolysable properties of polyester with the water resistance of polyether. This composite structure enables controlled dissolution where the polyester portion hydrolyzes to release antifouling agents while the polyether portion maintains film integrity, solving the contradiction between initial effect and long-term stability
Solution Approach 2:
The patent controls the hydrolysis rate by adjusting the polyester unit's molecular structure, specifically using dicarboxylic acids with 4-12 carbon atoms and controlling the number of carboxyl groups. This parameter optimization ensures stable film dissolution speed that maintains antifouling performance over extended periods without causing film defects
2Speed
If polyester resin with high hydrolysis rate is used to maintain active coating surface, then surface renewal is improved, but coating film stability deteriorates leading to cracks and defects
Solution Approach 1:
The copolymer structure with polyester and polyether units creates a balanced system where polyester provides controlled hydrolysis for surface renewal while polyether provides structural stability. This composite approach resolves the contradiction between dissolution speed and film stability
Solution Approach 2:
The patent creates different functional zones within the coating film: the polyester-rich regions undergo controlled hydrolysis for surface renewal, while the polyether-rich regions maintain structural integrity. This local differentiation allows simultaneous achievement of surface renewal and film stability
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 stable antifouling performance and surface renewal in seawater for an extended period without film defects, effectively preventing fouling organisms from adhering to surfaces.
Implementation Method 1
a polyester urethane resin (A); and an antifouling agent (B); wherein: the polyester urethane resin (A) is a product obtained by urethanization reaction of a polyester polyol (a) and an isocyanate compound (b)
Implementation Method 2
Polyester resin is formed by esterification, via dehydration condensation of acid and alcohol
Implementation Method 3
Polyester resin is formed by esterification, via dehydration condensation of acid and alcohol
Implementation Method 4
both of the resin forming the coating film and the antifouling agent dissolve in the seawater. In such antifouling coating, the surface of the coating film is dissolved, thereby always maintaining active antifouling coating film surface
Data Source
AI summary
An antifouling coating composition can maintain stable film dissolution speed for a long period of time in seawater, and can maintain stable antifouling performance without occurrence of defects such as cracks in the coating film. The antifouling coating composition includes: polyester urethane resin (A); and antifouling agent (B); wherein: the polyester urethane resin (A) is a product obtained by urethanization reaction of polyester polyol (a) and isocyanate compound (b); and the polyester polyol is represented by a particular chemical formula.