TITANIUM DIOXIDE COATINGS AND METHODS OF FORMING IMPROVED TITANIUM DIOXIDE COATINGS

• US 20110076450A1
• Filed: 09/29/2009
• Published: 03/31/2011
• Est. Priority Date: 09/29/2009
• Status: Abandoned Application

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Inventors: SHARMA, Pramod K.
• Application Number:
  US12/569,177
• Publication Number:
  US 20110076450A1
• Time in Patent Office: Days
• US Class Current: 428/141
• CPC Class Codes: C03C 15/00 Surface treatment of glass, not in the form of fibres or filaments, by etching etching or surface-brightening compositions, in general C09K13/00
• CPC Class Codes: C03C 17/256 Coating containing TiO2
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2217/75 Hydrophilic and oleophilic coatings
• CPC Class Codes: C03C 2218/113 by sol-gel processes
• CPC Class Codes: C23C 18/1216 Metal oxides C23C18/1212 takes precedence
• CPC Class Codes: C23C 18/1245 Inorganic substrates other than metallic
• CPC Class Codes: C23C 18/1254 Sol or sol-gel processing
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Abstract

Methods for forming titanium dioxide coatings are disclosed. Sol-gel compositions may be coated on a substrate having a roughened surface, and subsequently the coated substrate may be heated at a temperature sufficient to form an anatase titanium dioxide coating. Substrates having roughened surfaces and comprising such coatings are also disclosed.

Claims

1. A method of improving at least one of antimicrobial properties, self-cleaning properties, hydrophilicity, and activation time of a titanium dioxide coating, said method comprising:

preparing a titanium dioxide sol-gel composition;

providing a substrate having a roughened surface;

coating the roughened surface of the substrate with the sol-gel composition; and

heating the coated substrate to form an anatase titanium dioxide coating.

2. The method of claim 1, wherein the roughened surface of the substrate is formed by etching the surface of the substrate chemically or mechanically.

3. The method of claim 2, wherein the roughened surface of the substrate is formed by etching the surface of the substrate with an acid.

4. The method of claim 1, wherein the acid is chosen from hydrochloric acid and nitric acid.

5. The method of claim 1, wherein the roughened surface of the substrate has a mean square roughness ranging from about 3.75 nm to about 16 nm.

6. The method of claim 1, wherein the substrate is glass.

7. The method of claim 6, wherein the substrate is chosen from clear glass and low-iron glass.

8. The method of claim 1, wherein the coated substrate is heated at a temperature of about 600°

C. or greater.

9. The method of claim 1, wherein the anatase titanium dioxide coating further comprises a roughened surface.

10. A method of forming an anatase titanium dioxide coating on a roughened surface of a substrate, said method comprising;

preparing a titanium dioxide sol-gel composition;

providing a substrate having a roughened surface;

coating the roughened surface of the substrate with the sol-gel composition; and

heating the coated substrate to form an anatase titanium dioxide coating.

11. The method of claim 10, wherein the roughened surface of the substrate is formed by etching the surface of the substrate chemically or mechanically.

12. The method of claim 11, wherein the roughened surface of the substrate is formed by etching the surface of the substrate with an acid.

13. The method of claim 12, wherein the acid is chosen from hydrochloric acid and nitric acid.

14. The method of claim 10, wherein the roughened surface of the substrate has a mean square roughness ranging from about 3.75 nm to about 16 nm.

15. The method of claim 10, wherein the substrate comprises a glass substrate.

16. The method of claim 15, wherein the glass substrate is chosen from clear glass and low-iron glass substrates.

17. The method of claim 10, wherein the coated substrate is heated at a temperature of about 600°

C. or greater.

18. The method of claim 10, wherein the anatase titanium dioxide coating further comprises a roughened surface.

19. An antimicrobial and/or self-cleaning laminate, comprising:

a substrate having a roughened surface;

an anatase titanium dioxide coating on the roughened surface of the substrate.

20. The antimicrobial and/or self-cleaning laminate of claim 19, wherein the roughened surface of the substrate has a mean square roughness ranging from about 3.75 nm to about 16 nm.

21. A titanium dioxide-coated substrate, wherein said titanium dioxide coating is made by:

preparing a titanium dioxide sol-gel composition;

providing a substrate having a roughened surface;

coating the roughened surface of the substrate with the sol-gel composition; and

heating the coated substrate to form an anatase titanium dioxide coating.