Durable superhydrophobic coatings

• US 8,513,342 B2
• Filed: 10/18/2010
• Issued: 08/20/2013
• Est. Priority Date: 10/16/2009
• Status: Active Grant

• Current Assignee: University of Pittsburgh of The Commonwealth System of Higher Education
• Original Assignee: University of Pittsburgh of The Commonwealth System of Higher Education
• Inventors: Gao, Di, Cao, Liangliang
• Primary Examiner(s): Choi, Ling
• Assistant Examiner(s): Cai, Wenwen
• Application Number:
  US12/906,509
• Publication Number:
  US 20110111656A1
• Time in Patent Office: 1,037 Days
• Field of Search: 524/265, 524/520, 524/401, 524/267, 526/79, 526/86
• US Class Current: 524/267
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09D 127/18 Homopolymers or copolymers of tetrafluoroethene
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 442/20 Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer

Abstract

Durable superhydrophobic coating composition having a composition ranging from about 10 to about 80 w.t. % of an acrylic polymer resin, from about 5 to about 40 w.t. % of a polysiloxane oil, from about 1 to about 50 w.t. % of hydrophobic particles, from about 0.1 to about 10 w.t. % metal oxides, and the remainder being one or more solvents and optionally other additives. Methods of making the coating, as well as coated substrates, are also provided.

Claims

1. A method of making a superhydrophobic coating, the method comprising the steps of:

charging a mixture of butyl acrylate, butyl methacrylate, glycidyl methacrylate, toluene, acetone, and styrene into a polymerization vessel, which was mounted into an oil bath and heated at about 85°

C.;

preparing a resin from the mixture by free radical polymerization; and

mixing the resin with a polysiloxane oil, hydrophobic particles, metal oxide particles, and suitable solvents, to create the superhydrophobic coating.

2. The method according to claim 1, wherein the step of preparing the resin further comprises adding a second mixture of AIBN, toluene, and acetone to form a reaction mixture, and holding the reaction mixture at about 85°

C. for about 90 minutes.

3. The method according to claim 2, wherein the step of preparing the resin further comprises adding a third mixture of AIBN, toluene, and acetone to form a second reaction mixture, and holding the second reaction mixture at about 85°

C. for about 60 minutes.

4. The method according to claim 3, wherein the step of preparing the resin further comprises adding a fourth mixture of AIBN, toluene, and acetone to form a third reaction mixture, and holding the third reaction mixture at about 85°

C. for about 60 minutes.

5. The method according to claim 4, wherein the step of preparing the resin further comprises cooling the third reaction mixture at room temperature to form the resin, precipitating resin in hexane, filtering the resin, and drying the resin under vacuum at about 40°

C. for about 24 hours.