Fluorochemical Coating Composition for Haze-Free Water-Oil Repellency
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Solution Overview
Problem
Existing fluorochemical coating compositions struggle to form smooth, haze-free films on substrates while maintaining water/oil repellency and antifouling properties, as they tend to agglomerate and detract from substrate visibility and optical properties.
Innovation Solution
A fluorochemical coating composition comprising a hydrolyzable group-containing silane modified with a fluoropolyether-containing polymer and/or its partial hydrolytic condensate, combined with a hydrolyzable group-containing silane modified with a fluoropolyether-polysiloxane copolymer, in a specific weight ratio, to inhibit agglomeration and ensure a flat, smooth, water/oil repellent film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolyether-containing compounds are used as water/oil repellent agents, then water/oil repellency and antifouling properties are improved, but the compounds tend to agglomerate and form non-flat films, increasing haze and reducing transparency
Solution Approach 1:
The patent uses silane coupling agents as intermediary substances between the fluoropolyether-containing compounds and the substrate. The silane agents form a bridging layer that prevents direct agglomeration of fluoropolyether compounds while maintaining their water/oil repellent properties, thus resolving the contradiction between repellency and film flatness
Solution Approach 2:
The invention creates a composite coating system combining fluoropolyether-containing compounds with silane coupling agents. This composite approach leverages the low surface energy of fluoropolyethers for repellency while utilizing the adhesion and film-forming capabilities of silanes to maintain film flatness and reduce haze
2Reliability
If fluoropolyether-containing compounds are coated on substrate surface, then antifouling and lubricity properties are improved, but the coating difficultly adheres tightly to the substrate
Solution Approach 1:
Silane coupling agents serve as intermediary layers between the substrate and fluoropolyether-containing compounds. The silane molecules bond to the substrate surface through their reactive groups while presenting organic functional groups that interact with the fluoropolyether compounds, thereby mediating adhesion between the two incompatible materials
Solution Approach 2:
The silane coupling agent performs multiple functions simultaneously: it provides substrate adhesion through chemical bonding, enables film formation, and facilitates the attachment of fluoropolyether compounds. This multi-functionality resolves the adhesion problem while maintaining antifouling properties
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 consistently forms a flat and smooth water/oil repellent film on substrates, maintaining antifouling performance and protecting against chemical attacks without compromising substrate transparency or texture, and is effective over a long term.
Implementation Method 1
In the presence of airborne moisture or the like, the alkoxysilyl groups undergo self-condensation reaction to form a coating
Implementation Method 2
As the alkoxysilyl groups form chemical and physical bonds with the surface of glass or metal, the coating becomes a tough coating having durability
Data Source
AI summary
A fluorochemical coating composition is provided comprising (A) a hydrolyzable group-containing silane modified with a fluoropolyether-containing polymer and (B) a hydrolyzable group-containing silane modified with a fluoropolyether-polysiloxane copolymer in a weight ratio (A)/(B) of 40/60 to 95/5. The composition forms on a substrate a water/oil repellent layer which does not detract from the visibility of the substrate.