Methods of cleaning glass

Patent metadata

Field	Value
Publication number	US-2024383014-A1
Application number	US-202418661792-A
Country	US
Kind code	A1
Filing date	May 13, 2024
Priority date	May 19, 2023
Publication date	Nov 21, 2024
Grant date	—

Abstract

Methods of cleaning glass comprise mixing the glass with a peroxide-containing aqueous solution and heating the glass at a temperature of about 100°° C. or more. In aspects, 50 wt % of the peroxide-containing aqueous solution based on an amount of the glass is mixed with the glass. The peroxide-containing aqueous solution can be removed from the glass before the heating. Alternatively, in aspects, from 10 wt % to 50 wt % of the peroxide-containing aqueous solution based on an amount of the glass can be mixed with the glass.

First claim

What is claimed is:

1 . A method of cleaning glass comprising:
mixing the glass with 50 wt % or more of a peroxide-containing aqueous solution based on an amount of the glass for a period of time; removing the peroxide-containing aqueous solution from the glass; and then heating the glass at a temperature of about 100° C. or more.

2 . The method of claim 1 , wherein the peroxide-containing aqueous solution comprises from about 5 wt % to about 30 wt % of hydrogen peroxide based on an amount of the peroxide-containing aqueous solution.

3 . The method of claim 2 , wherein the peroxide-containing aqueous solution comprises from about 0.1 wt % to about 5 wt % of a surfactant based on the amount of the peroxide-containing aqueous solution.

4 . The method of claim 1 , wherein the mixing occurs in an oxygen-containing environment containing greater than 25 vol % oxygen.

5 . The method of claim 1 , wherein the period of time for the mixing is from about 10 minutes to about 8 hours.

6 . The method of claim 1 , wherein the removing comprises applying a vacuum.

7 . The method of claim 1 , wherein the removing comprises using filtration.

8 . The method of claim 1 , further comprising, after the removing the peroxide-containing aqueous solution and before the heating:
rinsing the glass with deionized water; and removing the deionized water by applying a vacuum, using filtration, or a combination thereof.

9 . The method of claim 1 , wherein the mixing occurs at a temperature less than 70° C.

10 . The method of claim 1 , wherein the heating the glass comprising heating at the temperature from about 100° C. to about 350° C. for from about 1 hour to about 8 hours.

11 . The method of claim 10 , wherein an amount of deionized water is from about 50 wt % to about 500 wt % of the amount of the glass.

12 . The method of claim 1 , wherein the glass comprises a powder comprising a median particle size from about 1 micrometer to about 1 millimeter.

13 . The method of claim 1 , wherein the method removes greater than 90 wt % of an amount of organic contaminants in the glass before the mixing.

14 . The method of any one of claim 1 , wherein, after the heating, the glass comprises less than 1000 ppm carbon.

15 . The method of claim 1 , wherein, using water instead of the peroxide-containing aqueous solution produces glass with 10% or more carbon than using the peroxide-containing aqueous solution.

16 . A method of cleaning glass comprising:
mixing the glass with from 10 wt % to 50 wt % of a peroxide-containing aqueous solution based on an amount of the glass for a period of time; and then heating the glass at a temperature of about 100° C. or more.

17 . The method of claim 16 , wherein the peroxide-containing aqueous solution comprises from about 5 wt % to about 30 wt % of hydrogen peroxide based on an amount of the peroxide-containing aqueous solution.

18 . The method of claim 16 , wherein the mixing occurs for the period of time from about 10 minutes to about 4 hours at a temperature less than 70° C.

19 . The method of claim 16 , wherein the heating occurs at the temperature from about 100° C. to about 350° C. for from about 1 hour to about 4 hours.

20 . The method of claim 16 , wherein the glass comprises a powder comprising a median particle size from about 1 micrometer to about 1 millimeter.

21 . The method of claim 16 , wherein the method removes greater than 90 wt % of an amount of organic contaminants in the glass before the mixing.

22 . The method of claim 16 , wherein, after the heating, the glass comprises less than 1000 ppm carbon.

Assignees

• Corning Inc

Inventors

• Deng Huayun
• Fan Deqiu
• He Mingqian
• Niu Weijun

Classifications

• C03C12/00

  Powdered glass (C03C8/02 takes precedence); Bead compositions · CPC title

• C03C23/0075

  Cleaning of glass (specially adapted to plate glass B08B11/00) · CPC title

• B08B7/0071

  by heating (B08B7/0035 takes precedence) · CPC title

• B08B3/14

  Removing waste, e.g. labels, from cleaning liquid · CPC title

• B08B3/08 Primary

  the liquid having chemical or dissolving effect · CPC title