ENAMELED-HEATED COOKING UTENSILS WITH NON-STICK CERAMIC COATING LAYER, AND PREPARATION METHOD THEREOF

• US 20120118168A1
• Filed: 02/05/2010
• Published: 05/17/2012
• Est. Priority Date: 07/23/2009
• Status: Active Grant

• Current Assignee: Thermolon Korea Co., Ltd.
• Original Assignee: Thermolon Korea Co., Ltd.
• Inventors: Park, Chung Kwon
• Granted Patent: US 9,084,505 B2
• Time in Patent Office: Days
• US Class Current: 99/324
• CPC Class Codes: A47J 36/02 Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
• CPC Class Codes: A47J 36/025 Vessels with non-stick features, e.g. coatings

Abstract

The present invention relates to enameled-heated cooking utensils with a non-stick ceramic coating layer, and a preparation method thereof, wherein enamel layers are formed on both sides of a main body of heating cooking utensils which is made by using an iron and steel material such as cast ion, steel, cold rolled steel plate and the like, and a non-stick ceramic coating layer which emits anions, radiates far infrared rays, is nonadhesive and does not harm the human body, is formed on the outer surface of the enamel layers. The surface roughness of the enamel layers is improved by sandblasting the outer surface of the enamel layers or forming an enamel layer containing silica fine particles on the outer surface of the enamel layers after forming the enamel layers on the outer portion of the main body made of an iron and steel material, and the adhesive force between the enamel layers and the non-stick ceramic coating layer is enhanced by forming a non-stick ceramic coating layer on the outer surface. The enameled heating cooking utensils according to the present invention has excellent corrosion resistance, abrasion resistance, heat resistance and the like, prevents food from sticking when heating food, and is environmentally-friendly by forming a ceramic coating layer which does not harm human body differently from polytetrafluoroethylene (PTFE) recently used as a non-stick coating agent, as a non-stick layer, and thus the demand of the enameled-heated cooking utensils according to the present invention is expected to remarkably increase hereafter.

Claims

1. An enameled heat-cooker including a non-stick ceramic coating layer, comprising:

a body made of an iron and steel material; and

a lower enamel layer and an upper enamel layer, which are formed on both surfaces of the body, respectively,

wherein the upper enamel layer comprises a non-stick ceramic coating layer formed on the outer surface thereof.

3. The enameled heat-cooker of claim 1, wherein the lower enamel layer and the upper enamel layer are coated with a glaze which consists of:

70-80 wt % of a mixture comprising 16-42 parts by weight of siliceous stone, 10-32 parts by weight of feldspar, 20-30 parts by weight of borax, 9-15 parts by weight of soda ash, 3-7 parts by weight of fluorite, 3-5 parts by weight of sodium acetate, 0.3-0.5 parts by weight of nickel oxide, and 0.4-0.6 parts by weight of cobalt oxide; and

20-30 wt % of water.

18. The enameled heat-cooker of claim 1, wherein the non-stick ceramic coating layer is coated with a ceramic coating composition which comprises 65-83 parts by weight of an inorganic binding agent consisting essentially of 50-70 wt % of a silane compound and 30-50 wt % of a silica sol, 10-19 parts by weight of a functional filler, 5-15 parts by weight of a ceramic powder in which a far infrared ray-radiating material and an anion-emitting material are mixed at a weight ratio of 1:

1, and 1-2 parts by weight of a pigment, based on 100 parts by weight of the ceramic coating composition.

19. The enameled heat-cooker of claim 18, wherein the silane compound is at least one selected from the group consisting of methyltrimethoxysilane, ethyltrimethoxysilane, normalpropyltrimethoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, normalpropyltriethoxysilane, phenylriethoxysilane, vinyltriethoxysilane, trifluoropropyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, tetraethoxysilane, and heptadecafluorodecyltrimethoxysilane.

20. The enameled heat-cooker of claim 18, wherein the silica sol is obtained by mixing 60 to 80% by weight of water and 20 to 40% by weight of a powder silicon oxide (SiO₂) having a particle size of from 0.2 to 1.0 μ

m, based on the total weight of the silica sol.

21. The enameled heat-cooker of claim 18, wherein the far infrared ray-radiating material is at least one selected from the group consisting of tourmaline, yellow ocher, sericite, amethyst, Sanggwangsuk*, bamboo charcoal, Uiwangsuk*, kiyoseki, obsidian, elvan, Kwangmyeongsuk*, and lava (*means Korean-to-English transliteration), and

the anion-emitting material is at least one selected from the group consisting of strontium, vanadium, zirconium (or zirconia), cerium, neodymium, lanthanum, barium, rubidium, cesium, and gallium.

2. An enameled heat-cooker including a non-stick ceramic coating layer, comprising:

a body made of an iron and steel material; and

a lower enamel layer and an upper enamel layer, which are formed on both surfaces of the body, respectively, wherein the upper enamel layer comprises a first enamel layer and a second enamel layer which are formed in a stack manner, and

wherein the second enamel layer of the upper enamel layer comprises a non-stick ceramic coating layer formed on the outer surface thereof.

4. The enameled heat-cooker of claim 2, wherein the lower enamel layer and the first enamel layer of the upper enamel layer are coated with a glaze which consists of:

70-80 wt % of a mixture comprising 16-42 parts by weight of siliceous stone, 10-32 parts by weight of feldspar, 20-30 parts by weight of borax, 9-15 parts by weight of soda ash, 3-7 parts by weight of fluorite, 3-5 parts by weight of sodium acetate, 0.3-0.5 parts by weight of nickel oxide, and 0.4-0.6 parts by weight of cobalt oxide; and

20-30 wt % of water, and

the second enamel layer of the upper enamel layer is coated with a glaze which consists of;

70-80 wt % of a mixture comprising 16-42 parts by weight of siliceous stone, 10-32 parts by weight of feldspar, 20-30 parts by weight of borax, 9-15 parts by weight of soda ash, 3-7 parts by weight of fluorite, 3-5 parts by weight of sodium acetate, 0.3-0.5 parts by weight of nickel oxide, 0.4-0.6 parts by weight of cobalt oxide, and 15-25 parts by weight of activated carbon; and

20-30 wt % of water.

5. The enameled heat-cooker of claim 2, wherein the non-stick ceramic coating layer is coated with a ceramic coating composition which comprises 65-83 parts by weight of an inorganic binding agent consisting essentially of 50-70 wt % of a silane compound and 30-50 wt % of a silica sol, 10-19 parts by weight of a functional filler, 5-15 parts by weight of a ceramic powder in which a far infrared ray-radiating material and an anion-emitting material are mixed at a weight ratio of 1:

1, and 1-2 parts by weight of a pigment, based on 100 parts by weight of the ceramic coating composition.

6. The enameled heat-cooker of claim 5, wherein the silane compound is at least one selected from the group consisting of methyltrimethoxysilane, ethyltrimethoxysilane, normalpropyltrimethoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, normalpropyltriethoxysilane, phenylriethoxysilane, vinyltriethoxysilane, trifluoropropyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, tetraethoxysilane, and heptadecafluorodecyltrimethoxysilane.

7. The enameled heat-cooker of claim 5, wherein the silica sol is obtained by mixing 60 to 80% by weight of water and 20 to 40% by weight of a powder silicon oxide (SiO₂) having a particle size of from 0.2 to 1.0 μ

m, based on the total weight of the silica sol.

8. The enameled heat-cooker of claim 5, wherein the far infrared ray-radiating material is at least one selected from the group consisting of tourmaline, yellow ocher, sericite, amethyst, Sanggwangsuk*, bamboo charcoal, Uiwangsuk*, kiyoseki, obsidian, elvan, Kwangmyeongsuk*, and lava (*means Korean-to-English transliteration), and

the anion-emitting material is at least one selected from the group consisting of strontium, vanadium, zirconium (or zirconia), cerium, neodymium, lanthanum, barium, rubidium, cesium, and gallium.

9. A method for manufacturing an enameled heat-cooker including a non-stick ceramic coating layer, the method comprising the steps of:

forming a lower enamel layer and an upper enamel layer on both surfaces of a body made of an iron and steel material, respectively;

performing sandblasting on the outer surface of the upper enamel layer to increase surface roughness; and

forming a non-stick ceramic coating layer on the sandblasted outer surface of the upper enamel layer.

12. The method of claim 9, wherein the sandblasting is performed by spraying steel balls each having a 60-200 mesh particle size onto on the outer surface of the upper enamel layer at a pressure of 3-7 kg/cm² for 5-20 seconds.

13. The method of claim 9, wherein the lower enamel layer and the upper enamel layer are coated with a glaze which consists of:

70-80 wt % of a mixture comprising 16-42 parts by weight of siliceous stone, 10-32 parts by weight of feldspar, 20-30 parts by weight of borax, 9-15 parts by weight of soda ash, 3-7 parts by weight of fluorite, 3-5 parts by weight of sodium acetate, 0.3-0.5 parts by weight of nickel oxide, and 0.4-0.6 parts by weight of cobalt oxide; and

20-30 wt % of water.

16. The method of claim 9, wherein the non-stick ceramic coating layer is coated with a ceramic coating composition which comprises 65-83 parts by weight of an inorganic binding agent consisting essentially of 50-70 wt % of a silane compound and 30-50 wt % of a silica sol, 10-19 parts by weight of a functional filler, 5-15 parts by weight of a ceramic powder in which a far infrared ray-radiating material and an anion-emitting material are mixed at a weight ratio of 1:

1, and 1-2 parts by weight of a pigment, based on 100 parts by weight of the ceramic coating composition.

17. The method of claim 9, wherein the lower enamel layer and the upper enamel layer, or the upper first enamel layer and the upper second enamel layer are formed by being subjected to pre-drying at 90-110°

C. for 10-30 minutes, and then to hot-drying at 820-950□

for 1-2 hours.

10. A method for manufacturing an enameled heat-cooker including a non-stick ceramic coating layer, the method comprising the steps of:

forming a lower enamel layer and an upper first enamel layer on both surfaces of a body made of an iron and steel material, respectively;

forming an upper second enamel layer on the outer surface of the upper first enamel layer using a glaze containing an activated carbon to increase surface roughness; and

forming a non-stick ceramic coating layer on the outer surface of the upper second enamel layer.

11. The method of claim 10, wherein the lower enamel layer and the upper enamel layer, or the upper first enamel layer and the upper second enamel layer are formed by being subjected to pre-drying at 90-110°

C. for 10-30 minutes, and then to hot-drying at 820-950□

for 1-2 hours.

14. The method of claim 10, wherein the lower enamel layer and the upper first enamel layer are coated with a glaze which consists of:

70-80 wt % of a mixture comprising 16-42 parts by weight of siliceous stone, 10-32 parts by weight of feldspar, 20-30 parts by weight of borax, 9-15 parts by weight of soda ash, 3-7 parts by weight of fluorite, 3-5 parts by weight of sodium acetate, 0.3-0.5 parts by weight of nickel oxide, and 0.4-0.6 parts by weight of cobalt oxide; and

20-30 wt % of water, and

the upper second enamel layer is coated with a glaze which consists of;

70-80 wt % of a mixture comprising 16-42 parts by weight of siliceous stone, 10-32 parts by weight of feldspar, 20-30 parts by weight of borax, 9-15 parts by weight of soda ash, 3-7 parts by weight of fluorite, 3-5 parts by weight of sodium acetate, 0.3-0.5 parts by weight of nickel oxide, 0.4-0.6 parts by weight of cobalt oxide, and 15-25 parts by weight of activated carbon; and

20-30 wt % of water.

15. The method of claim 10, wherein the non-stick ceramic coating layer is coated with a ceramic coating composition which comprises 65-83 parts by weight of an inorganic binding agent consisting essentially of 50-70 wt % of a silane compound and 30-50 wt % of a silica sol, 10-19 parts by weight of a functional filler, 5-15 parts by weight of a ceramic powder in which a far infrared ray-radiating material and an anion-emitting material are mixed at a weight ratio of 1:

1, and 1-2 parts by weight of a pigment, based on 100 parts by weight of the ceramic coating composition.