DURABLE SUPERHYDROPHOBIC COATINGS

• US 20140155522A1
• Filed: 03/11/2013
• Published: 06/05/2014
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: UT-Battelle LLC
• Original Assignee: UT-Battelle LLC
• Inventors: SIMPSON, John T., SCHAEFFER, Daniel A., POLYZOS, Georgios
• Granted Patent: US 9,828,521 B2
• Time in Patent Office: Days
• US Class Current: 523/400
• CPC Class Codes: C08K 7/24 inorganic
• CPC Class Codes: C08K 7/26 Silicon- containing compounds
• CPC Class Codes: C09D 127/22 modified by chemical after-treatment
• CPC Class Codes: C09D 163/00 Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
• CPC Class Codes: C09D 167/00 Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain based on polyester-amides C09D177/12; based on polyester-imides C09D179/08; Coating compositions based on derivatives of such polymers
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09D 5/031 characterised by particle size or shape
• CPC Class Codes: C09D 5/1681 Antifouling coatings characterised by surface structure, e.g. for roughness effect giving superhydrophobic coatings or Lotus effect
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds

Abstract

A superhydrophobic coating including a plurality of particles and a resin. The particles covalently bond to the resin and the resin does not fill the pores of the superhydrophobic particles such that the three dimensional surface topology of the superhydrophobic particles is preserved.

Claims

1. A superhydrophobic coating, comprising:

a resin; and

a plurality of particles each comprising;

at least one superhydrophobic region, and

at least one hydrophilic region,

wherein each particle has a three dimensional, nanostructured surface topology, defining a plurality of pores,

wherein the particles are covalently bonded to the resin via the at least one hydrophilic region,

wherein the resin does not fill the pores of the particles such that the three dimensional surface topology of the particles is preserved, and

wherein the plurality of particles render at least one surface of the resin superhydrophobic.

2. The superhydrophobic coating of claim 1, wherein at least a portion of the superhydrophobic particles are embedded within the resin so as to be surrounded by the resin.

3. The superhydrophobic coating of claim 1, wherein the resin is hydrophobic.

4. The superhydrophobic coating of claim 1, wherein each particle comprises a hydrophobic coating, the hydrophobic coating conforming to the surface of the superhydrophobic particle so as to preserve the nanostructured surface topology.

5. The superhydrophobic coating of claim 4, wherein the superhydrophobic particle comprises a diatomaceous earth particle.

6. The superhydrophobic coating of claim 1, wherein the porous core is hydrophilic.

7. The superhydrophobic coating of claim 1, wherein the porous core is a silicate.

8. The superhydrophobic coating of claim 7, wherein the silicate is etched to provide the nanostructured surface topology.

9. The superhydrophobic coating of claim 1, wherein the pore volume of each particle is less than 50% filled by the resin.

10. The superhydrophobic coating of claim 1, wherein the diameter of each particle is between 1-20 μ

m.

11. The superhydrophobic coating of claim 1, wherein the diameter of each particle is between 10-20 μ

m.

12. The superhydrophobic coating of claim 1, wherein the ratio of particles to resin is between 1:

1 and 1;

10, by volume.

13. The superhydrophobic coating of claim 1, wherein the at least one superhydrophobic region comprises a chemical moiety selected from the group consisting of a fluoromonomer, a paraffinic hydrocarbon monomer, and combinations thereof.

16. The superhydrophobic coating of claim 1, wherein the at least one hydrophilic region comprises a chemical moiety selected from the group consisting of a silane comprising at least one functional group.

17. The superhydrophobic coating of claim 16, wherein the at least one functional group is selected from the group consisting of (3-glycidoxypropyl)trimethoxysilane, (3-trimethoxysilylpropyl)diethylene-triamine, and combinations thereof.

14. The superhydrophobic coating of claim 14, wherein the fluoromonomer is (heptadecafluoro-1,1,2,2-tetrahydrodecyl)trichlorosilane.

15. The superhydrophobic coating of claim 14, wherein the paraffinic hydrocarbon monomer is an alkyl-based silane.

18. A method for producing amphoteric particles, the method comprising reacting a plurality of particulates comprising silica with both at least one superhydrophobic silane and at least one coupling agent to form a plurality of amphoteric particles, wherein each amphoteric particle comprises at least one superhydrophobic region, and at least one hydrophilic region.

19. The method of claim 18, wherein the reaction occurs in a single stage.

20. The method of claim 18, wherein the reaction occurs in a first stage and a second stage, wherein during the first stage the plurality of particulates are reacted with the at least one superhydrophobic silane, and wherein during the second stage the plurality of particulates are reacted with the at least one coupling agent.

21. The method of claim 18, wherein the at least one superhydrophobic region comprises a chemical moiety selected from the group consisting of a fluoromonomer, a paraffinic hydrocarbon monomer, and combinations thereof.

22. The method of claim 21, wherein the fluoromonomer is (heptadecafluoro-1,1,2,2-tetrahydrodecyl)trichlorosilane.

23. The method of claim 18, wherein coupling agent is a paraffinic hydrocarbon monomer.

24. The method of claim 23, wherein the paraffinic hydrocarbon monomer is an alkyl-based silane.

25. The method of claim 18, wherein the at least one hydrophilic region comprises a chemical moiety selected from the group consisting of a silane comprising at least one functional group.

26. The superhydrophobic coating of claim 25, wherein the at least one functional group is selected from the group consisting of (3-glycidoxypropyl)trimethoxysilane, (3-trimethoxysilylpropyl)diethylene-triamine, and combinations thereof.

27. A method for producing a superhydrophobic coating, the method comprising dispersing a solution a plurality of amphoteric particulates in a solution comprising a polymeric binder,

wherein each amphoteric particle comprises at least one superhydrophobic region, and at least one hydrophilic region,

wherein the polymeric binder comprises a plurality of functional groups capable of covalently bonding to the at least one hydrophilic region of each amphoteric particle.