Antifouling Silane Composition for Hardness and Water Repellency
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Solution Overview
Problem
Existing antifouling coatings face issues with surface hardness, friction properties, and environmental concerns, as well as vulnerability to scratches and stains, which affect their water repellency and durability.
Innovation Solution
A composition comprising a tetrafunctional silane-based compound, trifunctional silane-based compounds, and a metal catalyst, specifically formulated to enhance surface hardness, friction properties, and water repellency, while being environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine-containing compound is used to form a water-repellent film, then water repellency is improved, but environmental protection is worsened
Solution Approach 1:
The invention changes the chemical composition parameters by replacing fluorine-containing compounds with silicon-based compounds having specific molecular structures (formulae 1 and 2 with defined R1-R6 groups). This substitution maintains water repellency through hydrophobic alkyl groups while eliminating environmental harm associated with fluorine compounds.
Solution Approach 2:
The invention uses composite silane-based materials combining multiple functional groups (alkoxy groups for crosslinking, alkyl groups for hydrophobicity) within a single molecular structure. This composite approach achieves both water repellency and environmental compatibility without relying on harmful fluorine compounds.
2Strength
If the antifouling layer is made softer to reduce scratches, then surface hardness is reduced, but water slipping properties are worsened
Solution Approach 1:
The invention optimizes the molecular structure parameters of the silane-based compounds, specifically the length and branching of alkyl groups (R1-R6) and the ratio of alkoxy to alkyl groups. This parameter optimization achieves a balance where the crosslinked network provides hardness while the hydrophobic alkyl chains maintain water slipping properties.
Solution Approach 2:
The antifouling layer uses a composite molecular structure combining a crosslinked silicon oxide network (for hardness) with long hydrophobic alkyl side chains (for water slipping). This composite structure at the molecular level simultaneously achieves both surface hardness and water repellency without compromise.
3Strength
If the antifouling layer is made harder to improve scratch resistance, then surface hardness is improved, but friction properties are worsened
Solution Approach 1:
The invention carefully controls the molecular parameters including the carbon number of alkyl groups (6-20 carbons) and the molar ratio of different silane components. These parameter adjustments ensure the surface is hard enough for scratch resistance but maintains low friction through the hydrophobic molecular structure that prevents water and stain adhesion.
4Ease of manufacture
If a simple silane composition is used to reduce complexity, then manufacturing complexity is reduced, but surface state and curability are worsened
Solution Approach 1:
The invention segments the silane-based compound into multiple functional components within the molecular structure: alkoxy groups for controlled crosslinking, alkyl groups for hydrophobicity, and specific structural units for surface morphology control. This segmentation allows each component to perform its function independently, achieving excellent surface state and curability.
Solution Approach 2:
The invention employs composite silane chemistry combining tetrafunctional silanes (for crosslinking density) with trifunctional silanes (for surface properties). This composite material approach at the molecular level achieves superior curability and surface state while maintaining relatively simple manufacturing processes.
5Reliability
If the antifouling layer is made more resistant to stains, then stain resistance is improved, but surface hardness may be compromised
Solution Approach 1:
The invention adjusts the hydrophobicity parameters by selecting alkyl groups with specific carbon numbers (6-20) and controlling their density on the molecular structure. This parameter optimization creates a surface that is highly resistant to stain adhesion through hydrophobic effects while the crosslinked silicon network maintains adequate surface hardness.
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 solution provides an antifouling layer with improved surface hardness, low friction, and excellent water repellency, ensuring effective water slipping and resistance to stains and scratches, while being environmentally sustainable.
Implementation Method 1
a tetrafunctional silane-based compound represented by general formula (a)... a trifunctional silane-based compound represented by general formula (b)... a trifunctional silane-based compound represented by general formula (c)... and a metal catalyst
Implementation Method 2
a tetrafunctional silane-based compound... at least two trifunctional silane-based compounds... and a metal catalyst
Implementation Method 3
a tetrafunctional silane-based compound... at least two trifunctional silane-based compounds... and a metal catalyst
Implementation Method 4
the surfaces are given water repellency or antifouling properties... favorable water repellency and water slipping properties
Data Source
Figure 1(a)~2(b)
AI summary
Provided are an antifouling composition including a tetrafunctional silane-based compound having a specified structure as a component (A), trifunctional silane-based compounds having a specified structure different from each other as a component (B) and component (C), and a metal catalyst as a component (D), the antifouling composition satisfying: Condition (I): a ratio of a molar amount of the component (A) to a molar amount of the component (B) [(A)/(B)] (molar ratio) is 1.4 or more, and Condition (II): a ratio of a molar amount of the component (B) to a total molar amount of the component (B) and the component (C) [(B)/{(B) + (C)}] (molar ratio) is 0.020 or more, an antifouling sheet including an antifouling layer formed of the antifouling composition, and a method for producing the same.