Single component hydrophobic coating

Abstract

A coating composition includes a polymer prepared from a mixture of reactants including (a) a fluorinated polysiloxane and (b) an alkoxy silane functional resin. The alkoxy silane functional resin includes a polyurethane resin or an acrylic resin. A substrate at least partially coated with the coating composition is also disclosed. A method of condensing a polar fluid by contacting a substrate at least partially coated with the coating composition with a polar fluid, such that the polar fluid condenses on at least a portion of the coated substrate is also disclosed.

1 . A coating composition comprising a polymer prepared from a mixture of reactants comprising (a) a fluorinated polysiloxane; and (b) an alkoxy silane functional resin, wherein the alkoxy silane functional resin comprises a polyurethane resin or an acrylic resin, and wherein the coating composition is a single component coating composition. 
     
     
         2 . The coating composition of  claim 1 , wherein the mixture of reactants further comprises (c) a metal alkoxide. 
     
     
         3 . The coating composition of  claim 1 , further comprising a hydrophobic additive and/or a hydrophilic additive. 
     
     
         4 . The coating composition of  claim 3 , wherein the surface active coating composition comprises the hydrophobic additive, wherein the hydrophobic additive comprises a fluorinated treated silica, a fluorinated silane treated particle, a hydrophobic treated metal oxide, a rare earth metal oxide, or a combination thereof. 
     
     
         5 . The coating composition of  claim 1 , wherein the fluorinated polysiloxane comprises polytrifluoropropylmethylsiloxane. 
     
     
         6 . The coating composition of  claim 1 , further comprising a coupling agent. 
     
     
         7 . The coating composition of  claim 6 , wherein the coupling agent comprises a silane, an alkoxy silane, a fluoroalkylsilane, an aminopropyltriethoxysilane, or some combination thereof. 
     
     
         8 . The coating composition of  claim 3 , wherein the hydrophilic additive and/or the hydrophobic additive comprises at least 1 weight percent of the coating composition based on total solids weight of the coating composition. 
     
     
         9 . The coating composition of  claim 2 , wherein the metal alkoxide comprises at least 0.5 weight percent of the coating composition based on total solids weight of the coating composition. 
     
     
         10 . The coating composition of  claim 1 , wherein, when applied to a substrate and cured to form a coating, the coating is hydrophobic. 
     
     
         11 . The coating composition of  claim 1 , wherein, when applied to a substrate and cured to form a coating, the coated substrate exhibits a water contact angle of at least 140°. 
     
     
         12 . The coating composition of  claim 3  wherein, when applied to a substrate and cured to form a coating, the coating comprises a hydrophobic portion comprising at least a fluorinated portion of the polymer and a hydrophilic portion comprising the hydrophilic additive. 
     
     
         13 . The coating composition of  claim 3 , wherein the coating composition comprises the hydrophilic additive, wherein the hydrophilic additive comprises nano-sized particles comprising titanium dioxide, aminopropylsilane treated silica particles, untreated silica particles, or some combination thereof. 
     
     
         14 . The coating composition of  claim 1 , wherein the alkoxy silane functional resin comprises at least 4 alkoxy groups bonded to silicon atoms. 
     
     
         15 . The coating composition of  claim 1 , wherein when cured, a coating formed from the coating composition exhibits a hardness value greater than a hardness value of the same coating prepared from a coating composition not including the alkoxy silane functional resin. 
     
     
         16 . The coating composition of  claim 1 , further comprising a thermally conductive material comprising a metallic flake, a metallic powder, conductive carbon, or some combination thereof. 
     
     
         17 . A substrate at least partially coated with the coating composition of  claim 1 . 
     
     
         18 . The substrate of  claim 17 , wherein when the coating composition is solidified to form a coating layer, the coating layer has a film thickness of up to 3 mils. 
     
     
         19 . The substrate of  claim 17 , wherein the substrate comprises a surface of a component in a HVAC system. 
     
     
         20 . A method of condensing a polar fluid comprising:
 contacting a substrate at least partially coated with a coating formed from a coating composition comprising a polymer prepared from a mixture of reactants comprising (a) a fluorinated polysiloxane; and (b) an alkoxy silane functional resin, wherein the alkoxy silane functional resin comprises a polyurethane resin or an acrylic resin, and wherein the coating composition is a single component coating composition, with a polar fluid, such that the polar fluid condenses on at least a portion of the coated substrate.