JPH10113290A - Heat cooking appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating having a high hardness and excellent heat resistance by applying a non-tacky adhesive coating material which is prepd. by adding boron nitride powder to an inorg. coating material on the cooking surface of a heat cooking appliance such as a fly pan or hot plate and curing the non-tacky adhesive coating material by heating, thereby forming the ceramic coating. SOLUTION: The ceramic film 2 formed by curing the non-tacky adhesive coating material by adding the boron nitride powder 4 to the inorg. coating material 3 by heating is formed on the surface of the blank 1 of the heat cooking appliance. The blank 1 is most adequately aluminum. The inorg. coating material 3 is a water-based coating material consisting essentially of the organo oxide polymer of metal. The coating material is applied on a material to be coated and is heated, by which the ceramic film 2 of the metal oxide is formed on the surface of the material to be coated. The amt. of the boron nitride powder 4 to be added to the inorg. coating material 3 is adequately 1 to 10wt.% as solid content. The ceramic coating 2 may be colored to a desired color by adding a fluororesin and pigments at need to the non-tacky adhesive coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking appliance such as a frying pan or a hot plate, and more particularly to a cooking appliance having a cooking surface subjected to a non-stick coating treatment.

[0002]

2. Description of the Related Art Conventionally, in a cooking device such as a frying pan or a hot plate, a non-adhesive paint such as a fluororesin is applied to a cooking surface to impart non-adhesiveness.

[0003] These non-adhesive paints include ethylene tetrafluoride resin (PTFE) and tetrafluoroethylene resin.
Perfluoroalkyl vinyl ether copolymer (PF
A) are used, and these are used alone or in combination. Further, those obtained by blending mica or the like with these are also used.

[0004]

However, since these paints are mainly composed of organic polymer materials, they have insufficient hardness and are easily damaged, and are not sufficiently resistant to heat. It is the limit. Further, since the fluororesin itself is a dark color, the color of the painted surface is limited to a black or black-brown color, and the heating cooker cannot be colored in a light color or a beautiful color.

The present invention has been made in view of the above circumstances, and has as its object to form a coating having high hardness and excellent heat resistance by applying a non-adhesive inorganic coating to a cooking device. Is what you do.

[0006]

According to the present invention, a non-adhesive paint obtained by adding boron nitride powder to an inorganic paint is applied to a cooking surface, and the non-adhesive paint is heated and cured. It is characterized by forming a ceramic coating. In the present invention, a fluororesin can be added to the non-adhesive paint.

Further, in the present invention, a colored layer made of a colored paint obtained by adding a pigment to an inorganic paint is formed on a cooking surface, and a transparent non-adhesive layer made of the non-adhesive paint containing no pigment is formed on the surface thereof. Then, the colored layer and the transparent non-adhesive layer may be cured by heating to form a ceramic coating.

[0008]

FIG. 1 shows an embodiment of the present invention, in which a ceramic coating 2 is formed on a surface of a raw material 1 of a cooking device. The ceramic coating 2 is obtained by heat-curing a non-adhesive paint obtained by adding a boron nitride powder 4 to an inorganic paint 3.

As the material 1 of the cooking device, aluminum, copper, iron, stainless steel and the like can be used, and aluminum is most preferable. The aluminum may be obtained by die-casting or press-working.

The inorganic coating for forming the ceramic coating 2 is an aqueous coating mainly composed of an organo-oxide polymer of a metal such as silicon, aluminum, titanium, zirconium or the like. And heating to form a ceramic coating of a metal oxide on the surface of the object to be coated. Such a coating material is commercially available from Nichitan R & D Co., Ltd. under the trade name of Ceramica.

When this kind of inorganic coating is cured by heating, the organic component is decomposed and volatilized by heat, so that the coating becomes an inorganic ceramic, and the coating has high hardness and high heat resistance. , Withstands high heat of 600 ° C. or more.

The boron nitride powder 4 is a boron nitride having a chemical formula of BN, has a crystal structure similar to graphite, has a high heat resistance of about 3000 ° C., and has a high chemical resistance. Stable and lubricating.

An appropriate amount of the boron nitride powder 4 to be added to the inorganic coating material 3 is 1 to 10% by weight as a solid content. When the addition amount of the boron nitride powder 4 is less than 1% by weight, the non-adhesiveness of the coating film is insufficient, and when it exceeds 10% by weight, the hardness of the coating film becomes insufficient and the expensive boron nitride powder 4 is used. It is uneconomical because it is used in large quantities.

FIG. 2 shows another embodiment of the present invention, in which a fluororesin 5 is added to a non-adhesive paint. As the fluororesin 5 to be added here, a fluororesin which is usually used for processing a fluororesin applied to a cooking surface of a heating cooker can be used. The amount of the fluororesin 5 to be added to the non-adhesive paint is suitably 1 to 10% by weight in terms of solid content.

Further, by adding a pigment to the non-tacky paint of the present invention, the ceramic coating 2 can be colored in a desired color. The pigment is preferably an inorganic pigment having heat resistance.

In the present invention, in order to coat the cooking surface of the cooking utensil with the non-stick coating, an aqueous dispersion having a solid content of about 20 to 30% by weight is applied. The application method is not particularly limited, and the application can be performed by a method such as air spray. The thickness of the coating film is 20 to 30 after curing.
μ is appropriate.

After application of the non-stick coating, 250 to 3
Firing at 00 ° C. for about 15 to 30 minutes to cure the coating,
Form a ceramic coating.

FIG. 3 shows still another embodiment of the present invention, in which a color paint obtained by adding a pigment to an inorganic paint is applied to the surface of a raw material 1 and dried. A ceramic coating 2 is formed by applying a non-tacky paint and curing it by heating. In this ceramic coating 2, a colored layer 6 made of a colored paint and a transparent non-adhesive layer 7 made of a non-adhesive paint containing no pigment are used.
It is formed of two layers. Also in this embodiment, the transparent non-adhesive layer 7 may be formed by adding a fluororesin.

In the case of implementing this embodiment, the coating amounts of the coloring paint and the non-tacky paint containing no pigment are respectively
It is appropriate to apply so that the thickness after curing becomes 15 to 20 μm. When drying the colored paint, it is not preferable that the colored paint is cured by heating.
It is appropriate to heat at 0 to 100 ° C. for about 10 to 20 minutes to dry and solidify.

[0020]

【Example】

[Example 1] A plate material of a hot plate is molded from an aluminum alloy by a die casting method, subjected to a deburring process and a predetermined drilling process by a conventional method, and is degreased and cleaned with a weak alkaline cleaning solution. Next, blast processing was performed with an abrasive of # 80 to # 100 so that the surface roughness was Ra 1.0 to 2.0 μ.

Thereafter, 10% by weight of boron nitride powder based on the solid content was added to an aqueous inorganic paint (ceramica G95, trade name, manufactured by Nippon Laboratories Co., Ltd.) containing silicon as a main component to which a pigment was added. The non-tacky paint was applied by air spray so that the thickness after curing was 20 to 30 μm. Then, it was baked by heating at a temperature of 250 to 300 ° C. for 20 minutes.

By the above operation, a plate plate having a non-adhesive coating formed on the surface of the plate plate material was obtained. This coating is not glossy, but has a pencil hardness of 9H or more,
It withstands heat of 300 ° C. or more and has no wettability to water.

Example 2 An aqueous inorganic paint (ceramica G95) containing silicon as a main component to which a pigment was added was applied to a plate plate material processed in the same manner as in Example 1 to a thickness of 15 to 20 microns after curing. The resultant was applied by air spray, heated at 80 to 100 ° C. for 15 minutes, and dried.

Next, a non-adhesive paint obtained by adding 10% by weight of boron nitride powder with respect to the solid content to an aqueous inorganic paint containing silicon as a main component (same as above) is applied.
It was applied by air spray so as to have a thickness of １５15 μm, and baked by heating at 250 to 300 ° C. for 20 minutes.

By the above operation, a plate plate having a non-adhesive coating formed on the surface of the plate plate material was obtained. The coating is shiny, has a pencil hardness of 9H or more,
It withstands heat of 00 ° C. or more and has no wettability to water.

Example 3 An aluminum plate was pressed to form an inner pot material for a grill pan, and deburring and drilling were performed as in Example 1, followed by degreasing and blasting.

To this inner pot material, an aqueous inorganic paint (ceramica G95) containing silicon as a main component to which pigment was added,
It was applied by air spray so that the thickness after curing became 15 to 20 microns, heated at 80 to 100 ° C for 15 minutes, and dried.

Next, a non-adhesive paint obtained by adding 5% by weight of boron nitride powder and 5% by weight of ethylene tetrafluoride resin powder based on the solid content to an aqueous inorganic paint containing silicon as a main component (as described above) is used. Apply by air spray so that the thickness after curing becomes 10 to 15 microns.
It was baked by heating at 00 ° C. for 20 minutes.

By the above operation, an inner pan of a grill pan having a non-adhesive coating formed on the surface of the inner pan material was obtained. This coating was glossy, had a pencil hardness of 9H or more, and had no wettability to water. The heat resistance is dominated by the fluororesin, but withstands heat of about 300 ° C.

[0030]

According to the present invention, since the coating on the cooking surface of the cooking utensil is made of an inorganic ceramic, the hardness is as high as 9H or more in pencil hardness, and it is not easily damaged by a metal spatula. Further, since the heat resistance is higher than 600 ° C., it can be sufficiently used even with a direct fire exceeding 300 ° C. depending on cooking conditions.

Further, since boron nitride powder is added to the paint, the contact angle with water is small, and there is no wettability.
In addition, since it has lubricity, there is no stickiness to the object to be cooked, and no scorching or the like occurs during cooking.

The non-adhesive coating according to the present invention has a high thermal conductivity and a large heating effect on the object to be cooked.

According to the second aspect of the present invention, since the fluororesin is added to the non-adhesive coating, the non-adhesion is improved although the heat resistance is inferior, and the pencil hardness is sufficiently higher than 9H. High hardness can be secured.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view showing one embodiment of the cooking device of the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing another embodiment of the present invention.

FIG. 3 is a partially enlarged cross-sectional view showing still another embodiment of the present invention.

[Description of Signs] 1 Material 2 Ceramic coating 3 Inorganic paint 4 Boron nitride powder 5 Fluororesin 6 Colored layer 7 Transparent non-adhesive layer

Claims (3)

[Claims] A ceramic coating (2) obtained by applying a non-adhesive paint obtained by adding a boron nitride powder (4) to an inorganic paint (3) to a cooking surface and heating and curing the non-adhesive paint. Cooking utensils characterized by forming 2. The fluororesin (5) is added to the non-adhesive paint.
The cooking appliance according to claim 1, characterized in that is added. 3. A transparent layer made of the non-adhesive paint according to claim 1 or 2, wherein a colored layer (6) made of a colored paint obtained by adding a pigment to an inorganic paint is formed on the cooking surface, and the surface thereof is free of the pigment. A cooking appliance characterized by forming a non-adhesive layer (7), heating and curing the colored layer (6) and the transparent non-adhesive layer (7) to form a ceramic coating (2).