Antifouling Coating Composition Using Surface-Treated Titanium Oxide

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Solution Overview

Problem

Antifouling coating films containing a curable organopolysiloxane and a pyrithione salt, when combined with titanium oxide surface-treated with an aluminum compound, exhibit deteriorated antifouling properties when exposed to sunlight.

Innovation Solution

Incorporating titanium oxide surface-treated with silicon, zirconium, or zinc compounds into the antifouling coating composition to prevent decomposition of the pyrithione salt, thereby maintaining high antifouling performance even under sunlight exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If titanium oxide surface-treated with aluminum compound is used in the antifouling coating composition, then the coating film can be formed with good hiding properties and light resistance, but the antifouling properties deteriorate when exposed to sunlight

Engineering Contradiction:

Improveantifouling propertiesVSAvoiddecomposition of pyrithione salt by sunlight

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a specific surface treatment compound as an intermediary between the titanium oxide and the pyrithione salt. This surface treatment compound prevents direct harmful interaction between sunlight-activated titanium oxide and the pyrithione salt, thereby maintaining antifouling properties while preserving good hiding properties and light resistance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical composition parameter of the titanium oxide surface treatment from conventional aluminum compounds to specific compounds (silane coupling agents, zinc compounds, or their combinations). This parameter change fundamentally alters the interaction between titanium oxide and pyrithione salt under sunlight, preventing decomposition while maintaining other desirable properties.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If conventional aluminum compound surface treatment is applied to titanium oxide, then the coating composition shows good storage stability, but the antifouling performance deteriorates under sunlight exposure

Engineering Contradiction:

Improvestorage stabilityVSAvoidantifouling performance under sunlight

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent modifies the surface treatment compound parameter from aluminum-based to specific compounds (silane coupling agents, zinc compounds, or combinations). This parameter change maintains storage stability while simultaneously improving antifouling performance under sunlight by preventing pyrithione salt decomposition.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite surface treatment system where silane coupling agents and zinc compounds work synergistically on the titanium oxide surface. This composite approach provides both storage stability and enhanced antifouling performance under sunlight exposure.

Inventive Principle:

Principle #40Composite materials

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 composition provides durable and effective antifouling properties with a wide range of color hues and excellent hiding properties, even in sunlight environments.

Implementation Method 1

the titanium oxide (C) being surface-treated with a compound comprising at least one selected from the group consisting of silicon compounds (C1), zirconium compounds (C2) and zinc compounds (C3)

Methodology Applied

Scientific EffectPhoto-protection:

Data Source

PatentEP3564331B1Anti-fouling paint composition, Anti-fouling paint film, base material having Anti-fouling paint film attached thereto and method for producing same, and fouling prevention method

Publication Date: 2021.11.17 CHUGOKU MARINE PAINTS

AI summary

[Object] An organosiloxane antifouling coating composition containing a pyrithione salt is provided which can form antifouling coating films resistant to deterioration in antifouling properties even under environments where the coating films are susceptible to sunlight influence. [Solution] An organopolysiloxane antifouling coating composition includes a curable organopolysiloxane (A), a pyrithione salt (B), and titanium oxide (C), the titanium oxide (C) being surface-treated with a compound including at least one selected from the group consisting of silicon compounds (C1), zirconium compounds (C2) and zinc compounds (C3).