Antifouling Coating Composition With Fine Pyrithione Dispersion Stability
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Solution Overview
Problem
Existing antifouling coating compositions face issues with reduced dispersibility and storage stability due to the use of pyrithione metal salts with small particle sizes, leading to increased viscosity and aggregate formation.
Innovation Solution
Incorporating an oxidized polyethylene wax into a polyorganosiloxane-based antifouling coating composition containing pyrithione metal salts with a median diameter of 5.0 µm or less, along with a curable polyorganosiloxane, to enhance dispersibility and maintain anti-sagging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pyrithione metal salt with a small particle size (3 μm or less) is used to enhance antifouling performance, then the antifouling effectiveness is improved, but the dispersibility is lowered and the viscosity of the coating material increases
Solution Approach 1:
A silane-modified polyethylene wax is introduced as an intermediary substance to mediate between the pyrithione metal salt particles and the polyorganosiloxane matrix. The wax modifies the particle surface to improve compatibility and dispersibility while maintaining the small particle size (3 μm or less) necessary for high antifouling performance against microscopic organisms.
2Reliability
If a pyrithione metal salt with a small particle size (3 μm or less) is used to enhance antifouling performance, then the antifouling effectiveness is improved, but the storage stability is lowered and aggregate formation increases
Solution Approach 1:
The silane-modified polyethylene wax acts as a protective intermediary that prevents direct interaction between pyrithione metal salt particles and the coating matrix, reducing aggregation tendencies during storage while preserving the small particle size required for effective antifouling performance.
3Reliability
If a pyrithione metal salt with a small particle size (3 μm or less) is used to enhance antifouling performance, then the antifouling effectiveness is improved, but the viscosity of the coating material increases
Solution Approach 1:
The silane-modified polyethylene wax serves as a viscosity-reducing intermediary by improving the flow characteristics of the coating material containing fine pyrithione metal salt particles, thereby maintaining ease of manufacture and application while preserving the high antifouling performance enabled by small particle size.
4Reliability
If the particle size of pyrithione metal salt is reduced to enhance antifouling performance, then the effectiveness against microscopic organisms is improved, but the dispersibility in the coating composition is lowered
Solution Approach 1:
The silane-modified polyethylene wax modifies the surface properties of pyrithione metal salt particles, creating an intermediary layer that enhances compatibility with the polyorganosiloxane matrix and significantly improves dispersibility while maintaining the small particle size (3 μm or less) necessary for effectiveness against microscopic organisms.
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 provides superior antifouling performance, improved production workability, and enhanced storage stability, preventing aggregate formation and maintaining a high anti-sagging property.
Implementation Method 1
enhance the dispersibility
Implementation Method 2
a curable polyorganosiloxane (A)
Data Source
AI summary
The present invention has an object to provide an antifouling coating composition that provides an antifouling coating film superior in antifouling performance, that is superior in production workability and in dispersibility, and that is superior in storage stability so that generation of aggregates is prevented even after storage and furthermore, a high anti-sagging property is maintained even after storage, and a method for producing the same, and to provide an antifouling coating film obtained from the antifouling coating composition, a substrate with an antifouling coating film, including the antifouling coating film, and a method for producing the same. The antifouling coating composition of the present invention contains a curable polyorganosiloxane (A), a pyrithione metal salt (B), and an oxidized polyethylene wax (C), and satisfies at least one of the following Conditions A and B: Condition A: the pyrithione metal salt (B) in the antifouling coating composition has a median diameter (D50) of 5.0 µm or less Condition B: the pyrithione metal salt (B) that is a raw material has a median diameter (D50) of 3.0 µm or less.