DESCRIPTION
This invention provides a curable amphiphilic coating composition for marine fouling-release applications, engineered to deliver both protein resistance and low surface energy. The composition features two synergistic components:
(1) a Surface-Modifying Amphiphilic Additive (SMAA), created via hydrosilylation between Si–H functional siloxane and allyl-functional poly(ethylene glycol) methyl ether (allyl-mPEG), and
(2) an amphiphilic mPEG-PDMS isocyanate pre-polymer, made from a polyisocyanate, monocarbinol-terminated PDMS, and mPEG, with excess isocyanate functionality to ensure crosslinking.
The formulation also includes a polyisocyanate and a polyol (e.g., acrylic polyol) to create a robust, crosslinked coating upon cure. These materials assemble into a polyurethane-based amphiphilic network with phase-separated domains: hydrophobic PDMS segments facilitate fouling release, while hydrophilic PEG chains resist protein and microbial attachment by forming a hydration barrier. The SMAA migrates to the surface during application and exposure, helping the coating dynamically adjust to marine conditions and maintain its non-fouling properties.
The PEG/PDMS ratios, molecular weights, and SMAA content (typically 0.1–40 wt% of solids) are tunable, offering flexibility in coating design for different substrates and environmental conditions. The result is a non-toxic, durable, and high-performance coating solution suitable for long-term submersion in harsh marine environments.
Benefits
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Amphiphilic surface architecture: PEG and PDMS domains create a dual-action fouling defense.
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Non-toxic formulation: Avoids harmful biocides while achieving excellent fouling resistance.
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Dynamic surface rearrangement: SMAA migrates to surface under aqueous exposure.
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Tunable composition: PEG/PDMS ratio and molecular weights can be adjusted for specific needs.
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Durable polyurethane network: Strong mechanical performance in submerged environments.
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Effective against microfouling: Hydrated PEG domains reduce protein and microbial adhesion.
Applications
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Ship hull coatings: Reduce drag and fuel costs by preventing organism buildup.
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Offshore infrastructure: Long-term protection of platforms, risers, and submerged supports.
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Aquaculture systems: Cleanable, non-toxic coatings for nets, tanks, and underwater equipment.
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Oceanographic equipment: Protects sensors and instruments from biofilm formation.
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Defense and naval assets: Extends operational readiness with low-maintenance coatings.
Patents
This technology is the subject of published US Patent Application US20220119651A1 and is available for licensing or partnering opportunities.
