JPS5940062B2 - Self-purifying layer and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to the inner walls of cooking appliances and other cooking utensils to automatically clean dirt such as oil and fat scattered from food at the cooking temperature. The present invention relates to a self-purifying plate having an oxidation catalytic action capable of oxidation and a method for manufacturing the same.

U.S. Patent No. 3,266,477 discloses a method for automatically and continuously cleaning dirt that scatters and adheres to the inner wall surface of the cooking device when cooking food using a cooking device such as an oven or oven range. , Special public official 1978-178
No. 32, Special Publication No. 49-28120, and many other proposals have been made since then.

However, some of these conventional self-purifying coating layers use glassy frit and are fired at high temperatures, which reduces the ability of the oxidation catalyst they contain and consumes a large amount of energy. In addition, when a coating layer is formed with an inorganic coating on a base metal plate, the adhesion between the coating layer containing an oxidation catalyst and the base metal plate (steel, aluminized steel, etc.) is poor, resulting in heat shock and None of these coatings were satisfactory, as they tend to crack or peel off due to water vapor, and cannot guarantee a long service life as a coating layer.

Therefore, in consideration of these circumstances, a self-purifying coating layer using a porous metal material was proposed, which eliminates all the drawbacks of conventional coatings and has a high cleaning ability.

This is as shown in FIGS. 1 and 2.

FIG. 1 is an enlarged sectional view, and FIG. 2 is a perspective view showing the surface coating state, where 1 is the skeleton of the metal porous body, 2 is the oxidation catalyst particles, and 3a is the surface coating layer containing the oxidation catalyst particles 2. It is.

In other words, a self-cleaning coating layer using a porous metal material is
As shown in the figure, the pores of the metal porous body are filled with a binder containing oxidation catalyst particles, and the surface layer is also coated, which is firmly locked using the skeleton of the metal porous body as a structural material. It is something.

When applied to the inner walls of cooking appliances and other cooking utensils, such self-cleaning coatings not only can clean food-borne dirt more efficiently than conventional coatings, but are also robust. It has a long life.

However, according to experiments, it has been found that when the self-cleaning coating layer is applied thickly, cracks are likely to occur and workability is somewhat poor.

The present invention aims to provide a self-cleaning layer that improves the self-cleaning coating layer described above and eliminates its drawbacks, and a method for manufacturing the same.

The details of this invention will be explained below according to an embodiment shown in the drawings.

3 and 4 show a self-purifying layer produced by the method of the present invention, with FIG. 3 being an enlarged sectional view and FIG. 4 being a perspective view showing the state of surface coating.

3b is a surface coating layer containing the oxidation catalyst particles 2.

In producing the self-purifying layer as shown in FIGS. 3 and 4, the following composition was mixed in a ball mill and sprayed onto a porous metal body (trade name: Celmet, manufactured by Sumitomo Electric Co., Ltd.) using a spray gun.

At this time, the kneaded material was first filled into the pores of the metal porous body, and then applied to the surface as thinly as possible to take advantage of the surface shape.

In addition, as another painting method, if the mixed wire is painted with a brush,
We also investigated the case where the metal porous body was immersed in the kneaded material and applied, but in both of these cases, the surface coating layer was formed quite thick, as shown in Figures 1 and 2. It was difficult to apply thinly by taking advantage of the surface shape as shown in Figures 3 and 4.

Therefore, in the case of both methods, after coating, the surface is scraped with the edge of a roll or metal plate to remove excess coating material and produce a self-purifying plate as shown in Figures 3 and 4. I was able to do that.

Even if other coating methods (roll coating, showering, etc.) are used, the surface should be coated so thinly that the surface shape of the porous metal remains during coating, or the excess coating material that has adhered to the surface should be removed after coating. By removing it by scraping or other operations, a self-purifying plate as shown in FIGS. 3 and 4 can be manufactured.

Next, regarding the self-cleaning plate layer as shown in FIG. 3 manufactured according to the above-mentioned invention and the thick self-cleaning type coating layer of the surface coating layer, we will discuss the adhesion between the substrate (porous metal body) and the coated material and the processing. Heat cycle test 1-(40
(1 cycle of 0° C.← room temperature for 1 hour each), boiling water immersion test, and Edgisen test were conducted.

The results are shown in Table 1. For comparison, a similar test was also conducted on a conventional coating layer type plate in which a flat plate was coated with the above composition.

Furthermore, salad oil was applied to five points on the surface of each of the three samples, and the soil cleaning ability of each sample was measured from the weight change after being left in an electric furnace at 250°C and 300°C for 30 minutes.

For comparison, an aluminized steel plate was also included in the test materials.

The results are shown in Table 2.

As can be seen from Tables 1 and 2, the self-purifying layer according to the present invention has superior adhesion and processability between the porous metal body and the coated material compared to the conventional coating layer coated on a flat plate and the surface coating layer. It is superior to thick conventional self-cleaning cladding, and its cleaning ability is comparable.

Therefore, according to the present invention, when the manufactured self-purifying plate is applied to the inner wall of a cooking appliance or other cooking utensils, it is more effective than a conventional flat plate with a coating layer formed or a self-purifying type coating plate. It can be expected to have a much longer lifespan, and its manufacturing method is simple.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view showing a conventional self-cleaning type coating layer with a thick surface coating layer, Fig. 2 is a schematic diagram showing the state of the surface coating, and Fig. 3 is an enlarged view showing a self-purifying layer manufactured according to the present invention. The cross-sectional view and FIG. 4 are schematic diagrams showing the state of the surface coating. In the drawings, the same reference numerals indicate the same or corresponding parts; 1 is the skeleton of the metal porous body, 2 is the oxidation catalyst particle, 3 is the surface coating layer, and 4 is the cross section.

Claims (1)

[Scope of Claims] 1. A composition containing oxidation catalyst particles in a binder is coated on the skeleton of a porous metal body, and is also filled in the pores, and the surface shape of the porous body is A self-purifying layer characterized in that a composition is applied thinly enough to remain. 2 When applying a composition containing oxidation catalyst particles in a binder to a porous metal body, the surface of the porous metal body is not evenly and completely covered with the coating composition at the time of application, and its surface shape is A method for producing a self-purifying layer, the method comprising at least one of the following steps: applying the coating composition so thinly that it remains; or removing the coating composition adhered to the surface by scraping or the like after application. .