Heterophasic Anti-Fouling Coating with Fluorinated Continuous Phase
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Solution Overview
Problem
Current self-cleaning and anti-fouling surface coatings are either fragile, ineffective against solid contaminants and vapors, or require volatile organic compounds, and lack durability and long-term functionality due to environmental exposure.
Innovation Solution
A heterophasic thermoset polymeric coating formed from a water-borne precursor with a fluorine-containing polymer continuous phase and a fluorine-free polymer discrete phase, where the fluorine-free component is immiscible and bonded with a crosslinking agent, providing a robust and durable anti-fouling surface with reduced VOC usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If superhydrophobic and superoleophobic surfaces are used to create high contact angles, then water and oil drops roll off the surface, but these surfaces do not repel solid foreign matter or contaminant vapors and lose functionality over time due to environmental exposure or damage
Solution Approach 1:
The patent combines fluorinated polymer components (providing low surface energy and liquid repellency) with non-fluorinated polymer components (providing mechanical robustness) to create a composite coating material that achieves both self-cleaning capability and durability. This composite approach allows the coating to maintain its anti-fouling properties while being resistant to environmental damage.
Solution Approach 2:
The patent creates a coating with non-uniform composition where fluorinated and non-fluorinated polymer components are distributed in specific phases. The fluorinated domains provide localized low surface energy for liquid repellency, while the non-fluorinated matrix provides mechanical strength, achieving different properties in different regions of the coating.
2Ease of operation
If fluoropolymer sheets or treated surfaces are used to provide low surface energy, then adhesion force between foreign matter and the surface is reduced, but removal of all soils from the surface is problematic
Solution Approach 1:
The patent creates a composite coating combining fluorinated polymers (for liquid repellency) with non-fluorinated polymers (for enhanced anti-fouling properties). This composite structure provides both liquid repellency and reduced adhesion of solid contaminants, overcoming the limitations of pure fluoropolymer coatings.
Solution Approach 2:
The patent modifies the surface energy parameters by combining materials with different surface energy characteristics. The fluorinated components provide low surface energy for liquid repellency, while the non-fluorinated components further modify the surface properties to reduce adhesion of solid contaminants, achieving a balanced anti-fouling performance.
3Ease of operation
If fluoro-fluid filled surfaces are used to achieve low adhesion, then debris repulsion is improved, but the surface cannot be refilled or renewed once applied
Solution Approach 1:
The patent creates a coating where the fluorinated and non-fluorinated polymer components are permanently integrated into the coating matrix through crosslinking. The coating provides self-sustaining anti-fouling properties without requiring external refilling or renewal, as the low surface energy and anti-adhesion properties are inherent to the crosslinked polymer structure.
4Object-generated harmful factors
If water-borne precursors are used to reduce volatile organic compounds, then environmental impact is reduced, but achieving robust and durable anti-fouling surface is more challenging
Solution Approach 1:
The patent combines fluorinated and non-fluorinated polymer precursors in a water-borne formulation to create a composite coating that achieves both environmental compliance (low VOC) and durability. The crosslinking of both polymer types creates a robust network that maintains anti-fouling properties while using environmentally friendly water-based chemistry.
Solution Approach 2:
The patent changes the formulation parameters by using water-borne precursors instead of solvent-based systems. The crosslinking chemistry is adapted to work in aqueous environments, maintaining coating durability and anti-fouling performance while eliminating harmful organic solvents.
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 coating effectively prevents and reduces adhesion of debris, including solids and fluids, while maintaining functionality over time, with improved durability and reduced environmental impact.
Implementation Method 1
a crosslinking agent that crosslinks the fluorine-containing polymer component with the fluorine-free polymer component
Implementation Method 2
a fluorine-free polymer component that is substantially immiscible with the fluorine-containing polymer component, wherein the fluorine-free polymer component forms a discrete phase defining a plurality of domains within the continuous phase
Data Source
AI summary
An aqueous or water-borne precursor for forming an anti-fouling heterophasic thermoset polymeric coating is provided. The precursor includes a fluorine-containing polyol precursor having a functionality >about 2 that forms a branched fluorine-containing polymer component defining a continuous phase in the anti-fouling heterophasic thermoset polymeric coating. The precursor also includes a fluorine-free precursor that forms a fluorine-free component present as a plurality of domains each having an average size of ≥about 100 nm to ≤about 5,000 nm defining a discrete phase within the continuous phase in the anti-fouling heterophasic thermoset polymeric coating. A crosslinking agent and water are also present. An emulsifier may also be included. Methods of making anti-fouling heterophasic thermoset polymeric coatings with such precursors are also provided.