STRUCTUAL OBJECT COATED WITH SUPERHYDROPHBIC NANOSTRUCTURE COMPOSITE AND PROCESS FOR PRODUCING THE SAME

• US 20110160374A1
• Filed: 05/25/2009
• Published: 06/30/2011
• Est. Priority Date: 06/12/2008
• Status: Active Grant

• Current Assignee: DIC Corporation, Kawamura Institute Of Chemical Research
• Original Assignee: DIC Corporation, Kawamura Institute Of Chemical Research
• Inventors: Jin, Ren-Hua, Yuan, Jian-Jun
• Granted Patent: US 8,017,234 B2
• Time in Patent Office: Days
• US Class Current: 524/493
• CPC Class Codes: B08B 17/065 the surface having a microscopic surface pattern to achieve the same effect as a lotus flower
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01P 2004/03 obtained by SEM
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C03C 17/22 with other inorganic material C03C17/34, C03C17/44 take precedence
• CPC Class Codes: C03C 2217/76 Hydrophobic and oleophobic coatings
• CPC Class Codes: C09C 1/30 Silicic acid
• CPC Class Codes: C09C 1/3081 Treatment with organo-silicon compounds
• CPC Class Codes: Y10T 428/1314 Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
• CPC Class Codes: Y10T 428/2935 Discontinuous or tubular or cellular core

Abstract

The present invention relates to a structural object coated with a superhydrophobic nanostructure composite, the structural object being obtained by densely coating a surface of a solid substrate having a desired shape with a nanostructure obtained by combining a polymer having a polyethyleneimine skeleton with silica on the nanometer order, and bonding a hydrophobic group to the surface of the nanostructure, and a process for producing the structural object. The present invention also relates to a structural object coated with a superhydrophobic nanostructure composite, the structural object being obtained by removing the polymer having the polyethyleneimine skeleton from the nanostructure and bonding a hydrophobic group to the surface of the residual nanostructure containing silica as a main constituent component, and a process for producing the structural object. Furthermore, the present invention provides a method of using the structural object as a container for transferring an aqueous solution.

Claims

1. A structural object coated with a superhydrophobic nanostructure composite, the structural object comprising a superhydrophobic surface obtained by coating a solid substrate (X) with a superhydrophobic nanostructure composite (Z1),

wherein the superhydrophobic nanostructure composite (Z1) is a composite in which a hydrophobic group is bonded to silica (B) in a nanostructure (y1) containing the silica (B) and a polymer (A) having a polyethyleneimine skeleton (a).

2. The structural object according to claim 1, wherein the nanostructure (y1) includes, as a basic unit, a nanofiber having a diameter in the range of 10 to 200 nm and a length in the range of 50 nm to 2 μ

m, and a long axis of the nanofiber is oriented in a direction substantially perpendicular to the surface of the solid substrate (X).

3. The structural object according to claim 1, wherein the nanostructure (y1) contains a metal ion or a metal nanoparticle.

4-7. -7. (canceled)

8. A process for producing a structural object coated with a superhydrophobic nanostructure composite (Z1), the process comprising the steps of:

(1-1) immersing a solid substrate (X) in a solution containing a polymer (A) having a polyethyleneimine skeleton (a) and then taking out the solid substrate (X) to form a polymer layer on a surface of the solid substrate (X);

(1-2) immersing the solid substrate (X) having the polymer layer obtained in the step (1-1) into a silica source solution (B′

) to deposit silica (B) in the polymer layer formed on the surface of the solid substrate (X), thereby forming a nanostructure (y1); and

(1-3) treating the surface of the nanostructure (y1) on the solid substrate obtained in the step (1-2) with a silane coupling agent having a hydrophobic group.

9. A process for producing a structure coated with a superhydrophobic nanostructure composite (Z2) in which a hydrophobic group is bonded to silica (B) in a nanostructure (y2) containing the silica (B) as a main constituent component, the process comprising the steps of:

(2-1) immersing a solid substrate (X) in a solution containing a polymer (A) having a polyethyleneimine skeleton (a) and then taking out the solid substrate (X) to form a polymer layer on a surface of the solid substrate (X);

(2-2) immersing the solid substrate (X) having the resultant polymer layer into a silica source solution (B′

) to precipitate silica (B) in the polymer layer formed on the surface of the solid substrate (X), thereby forming a nanostructure (y1);

(2-3) calcining the solid substrate (X) coated with the nanostructure (y1) obtained in the (2-2) to remove the polymer (A) having the polyethyleneimine skeleton (a) from the nanostructure (y1), thereby forming the nanostructure (y2); and

(2-4) treating the surface of the nanostructure (y2) on the solid substrate obtained in the step (2-3) with a silane coupling agent having a hydrophobic group.