Antifouling Oxide Coating via Perfluoropolyether Solution
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Solution Overview
Problem
Existing surface modification methods for achieving antifouling properties on base materials, such as resin, require complex processes and high-temperature equipment, making them inefficient and unsuitable for materials with low heat resistance.
Innovation Solution
A surface modification method using a composition containing a perfluoropolyether chain modifier, an inorganic acid as a hydrolysis catalyst, and a metal or organometallic compound as a dehydration condensation catalyst, applied at ordinary temperature and pressure to form an antifouling structure precursor with uneven film thickness, enhancing the antifouling properties by creating a thick and thin area coverage on the oxide layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vapor deposition is used to modify the surface with a silane compound, then water repellency, oil repellency and antifouling property are improved, but the process complexity and equipment requirements increase
Solution Approach 1:
The patent replaces the mechanical vapor deposition system with a chemical solution-based approach. The silane compound is applied as a liquid or solution that undergoes hydrolysis and condensation reactions on the surface, eliminating the need for complex vapor deposition equipment while achieving the same antifouling, water repellency, and oil repellency properties
Solution Approach 2:
The patent changes the physical state of the silane compound from vapor phase to liquid/solution phase. This parameter change allows the surface modification to proceed through wet chemical reactions (hydrolysis and condensation) at lower temperatures and simpler conditions, reducing process complexity while maintaining the effectiveness of the antifouling coating
2Duration of action of stationary object
If high temperature curing is used to form the antifouling coating, then coating durability is improved, but the applicability to low heat resistance materials deteriorates
Solution Approach 1:
The patent changes the curing temperature parameter from high temperature to low temperature or ambient temperature. By optimizing the catalyst system and reaction conditions, the hydrolysis and condensation reactions proceed effectively at lower temperatures, enabling the formation of durable antifouling coatings on heat-sensitive materials without compromising coating durability
Solution Approach 2:
The patent introduces catalysts as intermediaries to facilitate the hydrolysis and condensation reactions at lower temperatures. These catalysts lower the activation energy barrier, allowing the silane compound to form a durable crosslinked network structure without requiring high temperature curing, thus making the process compatible with low heat resistance materials
3Ease of manufacture
If a simple application process is used, then ease of manufacture is improved, but the formation of uniform coating and antifouling performance deteriorates
Solution Approach 1:
The patent uses catalysts as intermediaries to control the reaction kinetics of hydrolysis and condensation. By carefully selecting and dosing the catalyst, the reaction proceeds uniformly across the surface even with simple application methods, ensuring consistent coating thickness and uniform antifouling performance while maintaining ease of manufacture
Solution Approach 2:
The patent ensures continuous and uniform reaction progression across the entire surface by optimizing the catalyst system. The hydrolysis and condensation reactions proceed continuously and uniformly, preventing localized variations in coating thickness and ensuring consistent antifouling properties throughout the coated area, even when using simple application processes
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
This method allows for the rapid production of antifouling structures with high affinity for lubricant oils, effectively reducing surface free energy and improving the retention and sliding properties of the antifouling layer, even on materials with low heat resistance, without the need for extensive equipment or high temperatures.
Implementation Method 1
a first modification accelerator containing an inorganic acid... accelerating hydrolysis
Implementation Method 2
a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt, and an organometallic compound... accelerating dehydration condensation
Implementation Method 3
modifying the surface of an oxide layer... to form an antifouling structure precursor... reducing surface free energy
Data Source
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AI summary
A surface modification method for modifying a surface of an oxide includes: producing a surface modification composition; and applying the surface modification composition onto the surface of an oxide layer. In producing the surface modification composition, a modifier having a perfluoropolyether chain is mixed with a first modification accelerator containing an inorganic acid and a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound. A surface modification composition, concurrently comprising: a modifier having a perfluoropolyether chain; a first modification accelerator containing an inorganic acid; and a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound. A surface modification composition set, comprising: a modifier having a perfluoropolyether chain; a first modification accelerator containing an inorganic acid; and a second modification accelerator containing at least one selected from the group consisting of a metal, a metal salt and an organometallic compound. An antifouling structure precursor, comprising: a modification layer that contains a modifier having a perfluoropolyether chain; and an oxide layer that has a surface entirely covered with the modification layer, wherein the modification layer has an uneven film thickness and comprises a comparatively thick area and a comparatively thin area that is dispersed in the comparatively thick area, and a coverage rate of covering the oxide layer with the comparatively thick area is equal to or greater than 10%. An antifouling structure, comprising: an antifouling structure precursor; and a lubricant oil on a surface of the antifouling structure precursor.