Heterophasic Anti-Fouling Coatings via Fluorinated Hydrophilic Phase Separation
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Solution Overview
Problem
Current self-cleaning and anti-fouling surfaces, such as superhydrophobic and superoleophobic surfaces, are ineffective in repelling solid foreign matter and contaminant vapors, and their functionality fades over time due to environmental exposure or damage, while low surface energy polymers do not provide adequate lubrication for debris removal.
Innovation Solution
A heterophasic thermoset polymeric coating is developed using an aqueous precursor liquid containing a fluorine-containing polymer and a second component, with a crosslinking agent, which forms a continuous and discrete phase structure to prevent and reduce adhesion of debris, including solids and fluids, and is environmentally friendly with reduced volatile organic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If superhydrophobic and superoleophobic surfaces are used to repel fluids, then contact angles are increased and fluid rejection is improved, but these surfaces cannot repel solid foreign matter and contaminant vapors, and their functionality fades over time
Solution Approach 1:
The patent creates a heterophasic coating system combining fluorinated polymer phases (for low surface energy and fluid repellency) with hydrophilic polymer phases (for solid particle rejection and vapor barrier properties). This composite structure allows the coating to simultaneously exhibit multiple anti-fouling mechanisms that address different types of contaminants, resolving the limitation of single-function superhydrophobic surfaces
Solution Approach 2:
The coating forms distinct phases with different properties distributed throughout the structure - fluorinated polymer-rich domains provide low surface energy for fluid repellency, while hydrophilic polymer domains provide polarity for rejecting solid particles and vapors. This local differentiation of material properties within the single coating layer enables versatile anti-fouling performance against multiple contaminant types
2Reliability
If low surface energy polymers are used to reduce adhesion force, then solvent repellency is improved, but they do not provide adequate lubrication for debris removal
Solution Approach 1:
The patent combines fluorinated polymers (providing low surface energy and solvent repellency) with hydrophilic polymers (providing lubrication properties through water interaction). The hydrophilic phase can interact with water to create a lubricating effect that facilitates debris removal, while the fluorinated phase maintains solvent repellency, thus resolving the contradiction between adhesion reduction and debris removal capability
3Reliability
If conventional coatings are used to prevent debris adhesion, then anti-fouling properties are provided, but volatile organic compounds are emitted and environmental friendliness is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by using fluorinated polymers and hydrophilic polymers that can be formulated in water-based systems with reduced or eliminated volatile organic compounds. This parameter change in the chemical composition maintains the anti-fouling functionality while reducing harmful environmental emissions
Data Source
AI summary
An aqueous precursor liquid for forming an anti-fouling heterophasic thermoset polymeric coating is provided. The precursor liquid includes a first fluorine-containing polyol precursor having a functionality >about 2 that forms a fluorine-containing polymer component defining a first phase in the coating. The precursor liquid also includes a second precursor that forms a second component present as a second phase. The first phase can be a continuous phase and the second phase can be a discrete phase, or the second phase can be the continuous phase and the first phase can be the discrete phase. The discrete phase includes a plurality of domains each having an average size of ≥to about 500 nm to ≤to about 25,000 nm. A crosslinking agent, water, and optional acid or base are also present. Methods of making anti-fouling heterophasic thermoset polymeric coatings with such precursors are also provided.