Graphene oxide-ceramic hybrid coating layer, and method for preparing the same

Patent metadata

Field	Value
Publication number	US-9540525-B2
Application number	US-201314145089-A
Country	US
Kind code	B2
Filing date	Dec 31, 2013
Priority date	Oct 22, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A graphene oxide-ceramic hybrid coating layer formed from a graphene oxide-ceramic hybrid sol solution that includes graphene oxide (GO) and a ceramic sol and a method of preparing the coating layer are provided. A content of graphene oxide in the graphene oxide-ceramic hybrid coating layer is about 0.002 to about 3.0 wt % based on the total weight of the graphene oxide-ceramic hybrid coating layer.

First claim

What is claimed is:

1. A method for preparing a graphene oxide-ceramic hybrid coating layer comprising:
preparing a solution that includes a graphene oxide slurry, whereby an aqueous surface environment of the graphene oxide slurry is replaced by a first non-aqueous based solvent;
combining the solution with a second non-aqueous based solvent and a ceramic precursor to prepare a mixture;
adding a dispersing agent and water to the mixture to prepare a graphene oxide-ceramic hybrid sol solution; and
coating a substrate with the graphene oxide-ceramic hybrid sol solution.

2. The method of claim 1 , wherein the process of preparing the solution that includes the graphene oxide slurry replaced by the first non-aqueous based solvent includes:
performing mechanical dispersion treatment and centrifugation after mixing the graphene oxide aqueous slurry and the first non-aqueous based solvent.

3. The method of claim 2 , wherein the mechanical dispersion treatment and centrifugation is performed at least twice, and the method further includes separating a supernatant after each centrifugation.

4. The method of claim 2 , wherein the mechanical dispersion treatment is performed by ultrasonication, stirring, shear stress (shearing force) application, using a homogenizer, or a combination thereof.

5. The method of claim 2 , wherein the centrifugation is performed at a rotation speed of about 1200 to about 3500 rpm.

6. The method of claim 1 , wherein the graphene oxide in the graphene oxide slurry replaced by the first non-aqueous based solvent is included in an amount of about 2 to about 7 wt % based on the total weight of the graphene oxide slurry replaced by the first non-aqueous based solvent.

7. The method of claim 1 , wherein the first non-aqueous based solvent or the second non-aqueous based solvent is an amphiphilic solvent, a water-miscible solvent, a water-immiscible solvent, a polar solvent, a nonpolar solvent, or a combination thereof.

8. The method of claim 1 , wherein the first non-aqueous based solvent or the second non-aqueous based solvent is IPA, ethanol, acetone, methylethylketone, methyl alcohol, ethyl alcohol, isopropyl alcohol, acetylacetone, butyl alcohol, ethylene glycol, polyethylene glycol, tetrahydrofuran, dimethylformamide, dimethyl acetamide, N-methyl-2-pyrrolidone, hexane, cyclohexanone, toluene, chloroform, dichlorobenzene, dimethylbenzene, trimethylbenzene, pyridine, methylnaphthalene, nitromethane, acrylonitrile, octadecylamine, aniline, dimethylsulfoxide, or a combination thereof.

9. The method of claim 1 , wherein the dispersing agent is polyethylene glycol (PEG), glycerol, hydrochloric acid (HCl), acetic acid, formic acid, citric acid, a polymer, or a combination thereof.

10. The method of claim 1 , wherein the sol solution for the graphene oxide-ceramic hybrid coating layer composition further includes an additive selected from the group consisting of: polyethylene glycol, glycerin, glucose, a polymer, and a combination thereof.

11. The method of claim 1 , wherein the coating process is performed by dip coating, spin coating, spray coating, paint coating, bar coating, flow coating, roll coating, or a combination thereof.

Assignees

• Hyundai Motor Co Ltd
• Korea Inst Ceramic Eng & Tech

Inventors

• Chang Kwang Il
• Song Chul Kyu
• Kim Dha Hae
• Hur Seung Hun

Classifications

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C09D5/26 Primary

  Thermosensitive paints · CPC title

• B05D1/30

  performed by gravity only, i.e. flow coating · CPC title

• B05D1/005

  Spin coating · CPC title

• B05D1/28

  performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers · CPC title