Antifouling Coatings: Silyl Ester Copolymer Stability
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Solution Overview
Problem
Antifouling coating compositions containing silyl ester copolymers and medetomidine suffer from stability issues during long-term storage due to viscosity increases and solidification, likely caused by decomposition of the silyl ester copolymer.
Innovation Solution
Incorporating a silyl methacrylate-based silyl ester copolymer with medetomidine in specific ratios, along with additional components like unsaturated monomers and dehydrating agents, to enhance storage stability and maintain antifouling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silyl ester copolymer is used as a film-forming component in antifouling coating composition, then the coating exhibits high renewability and antifouling performance, but the composition suffers from viscosity increase and solidification during long-term storage due to decomposition of the silyl ester copolymer
Solution Approach 1:
The patent changes the chemical structure parameters of the silyl ester copolymer by specifying that it must include structural units derived from silyl methacrylate (formula I) with specific R1, R2, R3, R4, R5, R6, and n values. This structural parameter change prevents decomposition during storage while maintaining the desired antifouling performance and renewability characteristics.
Solution Approach 2:
The patent creates a composite coating composition by combining the specifically structured silyl ester copolymer (A) with medetomidine (B) at controlled ratios (0.01-50 parts by weight per 100 parts of polymer). This composite structure leverages the stability of the modified silyl ester copolymer while incorporating the antifouling properties of medetomidine, achieving both storage stability and antifouling effectiveness.
2Duration of action of stationary object
If the silyl ester copolymer contains specific structural units for high renewability, then the coating film exhibits outstanding antifouling properties, but the composition becomes unstable during storage
Solution Approach 1:
The patent modifies the silyl ester copolymer structure by requiring inclusion of structural units from silyl methacrylate with specific parameters (R1 as hydrogen or carboxyl/silyl group, R2-R6 as C1-20 organic groups, n as 0 or greater integer). This structural optimization enables the polymer to maintain both long-term renewability and storage stability, resolving the contradiction between duration of action and reliability.
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 modified antifouling coating compositions exhibit improved storage stability and sustained antifouling performance over a long period, preventing fouling by aquatic organisms effectively.
Implementation Method 1
Silyl ester copolymers have particularly high renewability and are widely used as such hydrolyzable resins
Data Source
AI summary
An antifouling coating composition contains a silyl ester (co)polymer and medetomidine and is used to prevent the fouling of substrates by aquatic organisms and which can form antifouling coating films exhibiting outstanding antifouling properties over a long period and also has good storage stability. The antifouling coating composition includes a silyl ester (co)polymer (A) and medetomidine (B), the silyl ester (co)polymer (A) including structural units derived from a monomer (a) represented by the general formula (I): R1—CH═C(CH3)—COO—(SiR2R3O)n—SiR4R5R6, and structural units derived from an unsaturated monomer (b) copolymerizable with the monomer (a).