Durable superhydrophobic and superoleophobic coatings with nanoparticles
AssigneeBeijing Sanju Environmental Protection & New Materials Co., Ltd.
InventorsCarol A. ELLIS-TERRELL, Ronghua Wei
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Abstract
A hydrophobic and oleophobic coating material, comprising: nanoparticles, comprising a metal oxide or a metalloid oxide and having a particle diameter ranging from 50 to 600 nm; with a functionalizing coating on the surfaces of said nanoparticles, said functionalizing coating comprising a compound having a haloalkyl moiety or a haloalkylsilane moiety. The hydrophobic and oleophobic coating material, when applied to a substrate, provides a coated substrate that is characterized by hydrophobicity having a water contact angle of 150° or more and oleophobicity having an oil contact angle of 150° or more.
Claims17
A hydrophobic and oleophobic coating material, comprising:
- nanoparticles, comprising a metal oxide or a metalloid oxide and having an average particle diameter ranging from 50 to 600 nm;
- and
- a functionalizing coating directly applied to a surface of said nanoparticles, said coating comprising a compound having a haloalkyl moiety or a haloalkylsilane moiety,
- wherein said coating material, when applied to a substrate, exhibits hydrophobicity having a water contact angle of 150° or more and oleophobicity having an oil contact angle of 150° or more, and wherein said substrate does not comprise a binder, or comprises a binder applied directly to the substrate and/or comprises a binder present in between or mixed with the functionalized nanoparticles.
A method of manufacturing a hydrophobic and oleophobic coated substrate, the coating on the substrate comprising nanoparticles comprising a metal oxide or a metalloid oxide having an average particle diameter ranging from 50 to 600 nm and a functionalizing coating applied to a surface of said nanoparticles, the coating on the nanoparticles comprising a compound having a haloalkyl moiety or a haloalkylsilane moiety, wherein said substrate coating material, when applied to the substrate, exhibits hydrophobicity having a water contact angle of 150° or more and oleophobicity having an oil contact angle of 150° or more, said method comprising:
- (a) applying a base coat to the substrate;
- then
- (b) applying functionalized nanoparticles comprising a metal oxide or a metalloid oxide having a uniform particle diameter size ranging from 100 to 600 nm to the base-coated substrate;
- then
- (c) applying a base coat to the coated particles on the substrate;
- then
- (d) applying functionalized nanoparticles comprising a metal oxide or a metalloid oxide having a uniform average particle diameter ranging from 50 to 400 nm, wherein said uniform average particle diameter is smaller than the uniform average particle diameter applied in step (b), to the resulting base-coated particles on the substrate;
- then
- (e) heat curing the coated substrate.
Dependencies are inferred from the claim text.