Enamel composition and method of preparing the same

• US 11,261,124 B2
• Filed: 10/29/2019
• Issued: 03/01/2022
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Hyeyong
• Primary Examiner(s): Group, Karl E
• Application Number:
  US16/666,979
• Publication Number:
  US 20200131078A1
• Time in Patent Office: 854 Days
• CPC Class Codes: B01J 21/066 Zirconium or hafnium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 21/08 Silica
• CPC Class Codes: B01J 23/31 combined with bismuth
• CPC Class Codes: B01J 23/72 Copper
• CPC Class Codes: B01J 23/745 Iron
• CPC Class Codes: B01J 23/80 with zinc, cadmium or mercury
• CPC Class Codes: B01J 23/8472 Vanadium
• CPC Class Codes: B01J 23/885 and copper
• CPC Class Codes: B01J 23/888 Tungsten
• CPC Class Codes: C03C 14/004 the non-glass component being in the form of particles or flakes
• CPC Class Codes: C03C 2205/04 for self-cleaning enamels or glazes
• CPC Class Codes: C03C 2214/04 Particles; Flakes
• CPC Class Codes: C03C 3/066 containing zinc
• CPC Class Codes: C03C 3/115 containing boron
• CPC Class Codes: C03C 8/02 Frit compositions, i.e. in a powdered or comminuted form
• CPC Class Codes: C03C 8/14 Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
• CPC Class Codes: C03C 8/20 containing titanium compounds; containing zirconium compounds
• CPC Class Codes: C23D 5/00 Coating with enamels or vitreous layers
• CPC Class Codes: F24C 15/005 Coatings for ovens

Abstract

An enamel composition having improved cleaning performance, a method of preparing the enamel composition, and a cooking device having the enamel composition are disclosed. The enamel composition includes glass frit and a metal oxide catalyst, wherein the metal oxide catalyst includes at least one of a unary metal oxide or a binary metal oxide, thereby allowing cleaning at room temperature while exhibiting good fouling resistance to allow easy removal of oil contaminants, such as chicken fat.

Claims

1. An enamel composition comprising:

glass frit; and

a metal oxide catalyst,

wherein the metal oxide catalyst includes a binary metal oxide,

wherein the binary metal oxide includes at least one selected from a group of a Cu—

Mo alloy metal oxide and a Bi—

Mo alloy metal oxide.

2. The enamel composition according to claim 1, comprising:

90 wt % to 98 wt % of the glass frit; and

2 wt % to 10 wt % of the metal oxide catalyst.

3. The enamel composition according to claim 1, wherein the glass frit includes 15 wt % to 40 wt % of SiO₂.

4. The enamel composition according to claim 3, wherein the glass frit further includes 15 wt % to 40 wt % of B₂O₃.

5. The enamel composition according to claim 4, wherein the glass frit further includes:

8 wt % to 20 wt % of Na₂O,

3 wt % to 10 wt % of K₂O, and

1 wt % to 3 wt % of Li₂O.

6. The enamel composition according to claim 5, wherein the glass frit further includes:

15 wt % to 40 wt % of ZnO,

1 wt % to 5 wt % of NaF,

2 wt % to 6 wt % of Co₃O₄, and

0.5 wt % to 3 wt % of NiO.

15. A cooking device comprising:

a cavity defining a cooking chamber;

a door selectively opening and closing the cooking chamber;

at least one heating source that supplies heat to the cooking chamber; and

a coating layer formed by providing a coating layer of the enamel composition according to claim 1 on at least one of an inner surface of the cavity or an inner surface of the door.

7. A method of preparing an enamel composition, comprising:

preparing glass frit;

preparing a metal oxide catalyst including a binary metal oxide; and

mixing the glass frit with the metal oxide catalyst,

wherein the binary metal oxide includes at least one selected from a group of a Cu—

Mo alloy metal oxide and a Bi—

Mo alloy metal oxide.

8. The method of preparing that enamel composition according to claim 7, wherein preparing the glass frit includes:

melting glass frit materials; and

quenching the melted glass frit materials to form the glass frit.

9. The method of preparing the enamel composition according to claim 7, wherein preparing the metal oxide catalyst includes:

heating the selected two metal oxides at 500°

C. to 1,500°

C.; and

cooling the heated selected two metal oxides.

10. The method of preparing the enamel composition according to claim 7, wherein mixing the glass frit with the metal oxide catalyst includes mixing 90 wt % to 98 wt % of the glass frit with 2 wt % to 10 wt % of the metal oxide catalyst.

11. The method of preparing the enamel composition according to claim 7, wherein the glass frit includes 15 wt % to 40 wt % of SiO₂.

12. The method of preparing the enamel composition according to claim 11, wherein the glass frit further includes 15 wt % to 40 wt % of B₂O₃.

13. The method of preparing the enamel composition according to claim 12, wherein the glass frit further includes:

8 wt % to 20 wt % of Na₂O,

3 wt % to 10 wt % of K₂O, and

1 wt % to 3 wt % of Li₂O.

14. The method of preparing the enamel composition according to claim 13, wherein the glass frit further includes:

15 wt % to 40 wt % of ZnO,

1 wt % to 5 wt % of NaF,

2 wt % to 6 wt % of Co₃O₄, and

0.5 wt % to 3 wt % of NiO.