ANTIFOULING STRUCTURE AND METHOD FOR PRODUCING THE SAME

• US 20180326709A1
• Filed: 09/24/2015
• Published: 11/15/2018
• Est. Priority Date: 07/17/2015
• Status: Abandoned Application

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: NOGUCHI, Yuji
• Application Number:
  US15/745,319
• Publication Number:
  US 20180326709A1
• Time in Patent Office: Days
• CPC Class Codes: B32B 2383/00 Polysiloxanes
• CPC Class Codes: B32B 27/283 comprising polysiloxanes
• CPC Class Codes: B32B 5/18 characterised by features of a layer of foamed material
• CPC Class Codes: B32B 9/00 Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
• CPC Class Codes: C08K 3/16 Halogen-containing compounds
• CPC Class Codes: C08L 2201/08 Stabilised against heat, light or radiation or oxydation
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
• CPC Class Codes: C09D 5/1675 Polyorganosiloxane-containing compositions
• 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 5/1687 Use of special additives
• CPC Class Codes: C09D 7/63 organic
• CPC Class Codes: C09D 7/65 macromolecular C09D7/41-C09D7/48 take precedence

Abstract

An antifouling structure includes a surface layer that is formed on a base and includes a microporous structure, and a fluorine-containing liquid held in micropores of the microporous structure. Elemental fluorine is present at least in a surface portion of the surface layer.

Claims

1-18. -18. (canceled)

19. An antifouling structure, comprising:

a base;

a structure that is formed on a surface of the base and comprises a microporous structure with micropores; and

a fluorine-containing liquid retained in the micropores of the microporous structure,

wherein elemental fluorine is present in a surface of the microporous structure, and an average diameter of surface openings of the micropores in the microporous structure is equal to or greater than 10 nm.

20. The antifouling structure according to claim 19, wherein the average diameter of the surface openings ranges from 10 nm to 1000 nm.

21. The antifouling structure according to claim 19, wherein the elemental fluorine is present as a fluorine functional group.

22. The antifouling structure according to claim 19, wherein the average diameter of the surface openings ranges from 10 nm to 500 nm.

23. The antifouling structure according to claim 19, wherein the average diameter of the surface openings ranges from 10 nm to 100 nm.

24. The antifouling structure according to claim 19, wherein the elemental fluorine is present in the surface of the microporous structure in an area from a surface of the structure to a depth of at least T/50, where T is a thickness of the structure.

25. The antifouling structure according to claim 19, wherein a thickness of the structure is equal to or greater than 50 nm.

26. The antifouling structure according to claim 19,

wherein a thickness of the structure ranges from 50 nm to 1000 nm, and

the average diameter of the surface openings ranges from 10 nm to 100 nm.

27. The antifouling structure according to claim 19, wherein the elemental fluorine is present in the surface of the microporous structure in an area from a surface of the structure to a depth of at least T/2, where T is a thickness of the structure.

28. The antifouling structure according to claim 19, wherein a thickness of the structure is equal to or greater than 100 nm.

29. The antifouling structure according to claim 19, wherein the elemental fluorine is present in the surface of the microporous structure from a surface of the structure to a depth of at least 4T/5, where T is a thickness of the structure.

30. The antifouling structure according to claim 19,

wherein an all-optical transmittance is equal to or greater than 70%, and

a haze value is equal to or less than 1%.

31. The antifouling structure according to claim 19, wherein the microporous structure satisfies a condition of the following Expression 1,

10 (nm)≤

D (nm)≤

400 (nm)/n 

 

(1),

in which D is the average diameter of the surface openings, and n is a refractive index of a material of the structure.

32. The antifouling structure according to claim 19, wherein an evaporation loss of the fluorine-containing liquid after retention at 120°

C. for 24 hours is less than 35 mass %.

33. The antifouling structure according to claim 19, wherein a viscosity at 0°

C. of the fluorine-containing liquid is equal to or less than 160 mm²/s.

34. The antifouling structure according to claim 19, wherein the structure is made of an inorganic material containing silicon oxide.

35. A method for producing an antifouling structure that comprises:

a base;

a structure that is formed on a surface of the base and comprises a microporous structure with micropores; and

a fluorine-containing liquid retained in the micropores of the microporous structure, wherein elemental fluorine is present in a surface of the microporous structure, and an average diameter of surface openings of the micropores in the microporous structure is equal to or greater than 10 nm,

the method comprising;

forming the structure on the surface of the base, in which the structure comprises the microporous structure with the micropores having an average diameter of the surface openings of 10 nm or more, and the elemental fluorine is present in the surface of the microporous structure,

wherein the forming step comprises;

applying an application liquid containing a polymerizable organometallic compound, an organometallic compound having a fluorine functional group and an acid or basic catalyst to the base;

then heating the base at 20°

C. to 200°

C. to precure the application liquid; and

thereafter heating the base at 300°

C. to 500°

C.

36. The method for producing the antifouling structure according to claim 35, further comprising:

subjecting the structure to a surface modification with an organometallic compound having a fluorine functional group.

37. The method for producing the antifouling structure according to claim 35, wherein the polymerizable organometallic compound is at least one of an alkoxysilane monomer and an alkoxysilane oligomer.

38. An automobile part comprising the antifouling structure, the antifouling structure comprising:

a base;

a structure that is formed on a surface of the base and comprises a microporous structure with micropores; and

a fluorine-containing liquid retained in the micropores of the microporous structure,

wherein elemental fluorine is present in a surface of the microporous structure, and

an average diameter of surface openings of the micropores in the microporous structure is equal to or greater than 10 nm.

39. A precursor of an antifouling structure, comprising:

a base; and

a structure that is formed on a surface of the base and comprises a microporous structure with micropores,

wherein elemental fluorine is present in a surface of the microporous structure, and

an average diameter of surface openings of the micropores in the microporous structure is equal to or greater than 10 nm.