Polysilazane Antifouling Coating Surface State and Curability
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Solution Overview
Problem
Existing antifouling compositions with high silicone oil content in polysilazane-based coatings result in inferior surface state and curability, leading to poor water droplet slipping properties, especially on surfaces with small tilt angles, causing water droplets to adhere.
Innovation Solution
A polysilazane-based antifouling composition incorporating both terminal carboxy-modified silicone in a specific proportion, along with an organic solvent solution containing hydrogen chloride, is used to form a sheet-like antifouling layer that improves surface state and curability, ensuring effective water repellency even at small tilt angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coating agent containing organic polysilazane and silicone oil with large silicone oil content is used, then the coating can be formed on the surface, but the surface state and curability of the formed sheet-like material become inferior
Solution Approach 1:
The patent changes the chemical structure parameter of the silicone oil from conventional types to both terminal carboxy-modified silicone, which fundamentally alters the curing mechanism and surface properties. This parameter change enables the coating to achieve excellent surface state and curability while maintaining ease of manufacture
Solution Approach 2:
The patent creates a composite coating system by combining organic polysilazane with both terminal carboxy-modified silicone in specific proportions (0.01-10 parts by mass based on 100 parts by mass of polysilazane). This composite material approach synergistically improves both surface state and curability while preventing cissing
2Reliability
If conventional coating agents are used to form coating film on surfaces, then water repellency is provided, but water droplet slipping properties are insufficient on surfaces with small tilt angles
Solution Approach 1:
The patent changes the surface energy parameters by introducing both terminal carboxy-modified silicone, which creates a dual-function surface: hydrophobic regions for water repellency and polar carboxy groups for enhanced surface adhesion. This parameter optimization enables water droplets to slip easily even on surfaces with small tilt angles
Solution Approach 2:
The coating creates local quality differentiation at the molecular level, with hydrophobic silicone chains providing water repellency and carboxy terminal groups providing directional orientation. This local quality distribution enables superior water droplet slipping properties while maintaining overall water repellency
3Reliability
If paint or coating agent is directly coated on resin film to form sheet-like antifouling layer, then antifouling properties are provided, but cissing is generated and surface state becomes remarkably inferior
Solution Approach 1:
The patent changes the chemical reactivity parameters by using both terminal carboxy-modified silicone that can form strong chemical bonds with the resin film substrate. This parameter change eliminates cissing by ensuring uniform adhesion across the entire coating surface while maintaining antifouling properties
Solution Approach 2:
The both terminal carboxy-modified silicone acts as an intermediary between the organic polysilazane and the resin film substrate. The carboxy groups facilitate strong adhesion to the substrate while the silicone chains provide the antifouling surface, preventing cissing and surface defects
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 achieves a favorable surface state and curability, allowing water droplets to be easily slipped off, even on surfaces with small tilt angles, thereby enhancing water repellency and preventing adhesion.
Implementation Method 1
an antifouling composition including a polysilazane-based compound (A) and a both terminal carboxy-modified silicone (B)
Implementation Method 2
the sheet-like antifouling layer formed of the antifouling composition of the present invention has favorable surface state and curability and also has excellent water repellency such that even when a tilt angle is small, water droplets can be slipped off
Data Source
Figure 1(a)~2(b)
AI summary
Provided is an antifouling composition including a polysilazane-based compound (A) and a both terminal carboxy-modified silicone (B), the content of the component (B) being from 0.01 to 10 parts by mass based on 100 parts by mass of the total amount of the component (A), and the antifouling composition serves as a sheet-like antifouling layer-forming material. The antifouling composition is able to form a sheet-like antifouling layer having favorable surface state and curability and also having excellent water repellency such that even when a tilt angle is small, water droplets can be slipped off.