JPH03296439A - Paint cured film and cooker having the same - Google Patents

Abstract

PURPOSE:To obtain a cooker having a contaminant purifying film by baking and curing paint consisting of polyborotitanosiloxane or polyborosiloxane, fibrous inorg. matter, a copper compound and a solvent to form the contaminant purifying film. CONSTITUTION:Polyborotitanosiloxane purifying film consisting of silicon, boron, titanium and oxygen or polyborosiloxane 1 consisting of silicon, boron and oxygen is used as a binder. This binder is mixed with fibrous inorg. matter 2 such as a silica alumina fiber, a copper compound 3 such as cupric oxide or copper carbonate and a solvent to prepare paint. This paint is applied to the wall surface material formed to the surface of a metal porous body 4 and subsequently baked and cured to form a porous paint cured film having catalytic action. Therefore, the contaminant due to the cooking in a cooker can be decomposed and purified.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cured paint coating for cleaning dirt generated from cooking appliances for household use, business use, etc., and a cooking appliance having the same.

Conventional technology In the past, there were mainly three methods for cleaning dirt generated from cooking appliances.
The second method is to heat the cooking chamber to ~500"C to thermally decompose the dirt. The second method is to form a film containing a catalyst such as transition metal oxide or zeolite that has a catalytic action on the wall surface of the cooking chamber and decompose the dirt through the catalytic action. The third method is to form a non-adhesive film on the inner wall of the training room and wipe off any dirt that has adhered to it.

Problems to be Solved by the Invention However, the above conventional techniques have the following problems.

With the first thermal decomposition method, there are issues with thermal deterioration and safety of electronic components due to the high temperature being maintained for a long period of time, while with the second decomposition method using catalytic action, the catalyst is covered with the binder in the film. There are problems in that high activity cannot be obtained and the decomposition of dirt is incomplete, and a part of the catalyst is reduced and deteriorated during the reaction. The problem is that the heat resistance temperature of the metal is low.

The present invention aims to solve these problems and provide a cured paint film that cleans dirt due to catalytic action, and a cooking appliance having the same.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a polyborotitanosiloxane composed of silicon, boron, titanium and oxygen, or a polyborosiloxane composed of silicon, boron and oxygen and a fibrous inorganic substances, cupric oxide (Cub), copper carbonate (CuCOl), copper hydroxide [Cu
(OH)z ] and copper acetate [Cu (OOCCH3)
A coating mixture of one or more of the copper compounds selected from the following and a solvent is fired and cured to form a porous cured coating film having catalytic action. Further, this cured paint film is formed on the surface of the metal porous body to form a wall material, and the cooking appliance has at least one wall material inside the cooking chamber.

Effect By the above means, polyborotitanosiloxane or polyborosiloxane is a binder, and although it is difficult to form a film by itself even if it is baked and cured, it is easy to form a film by adding an appropriate amount of filler. Moreover, fibrous inorganic materials tend to form porous films, and in particular, fibrous inorganic materials increase porosity. The reason is,
This is because since the fibers are straight, they tend to intertwine with each other in the coating, creating voids.

It is an oxidation reaction that decomposes oil stains, which are typical stains caused by cooking, through catalytic action, and the presence of oxygen is important. The oxygen is supplied from the air, and in order to take in as much oxygen as possible, a porous film is desired. Therefore, the coating obtained as described above is suitable.

Furthermore, cupric oxide, which acts as a catalyst, is prepared by impregnating the powder with oil (e.g. salad oil) and heating it in the air (approximately 3
(00 to 350℃), the oil is oxidized and decomposed, but the structure does not change before and after the reaction.Other transition metal oxides such as manganese and cobalt are easily reduced during the reaction and their structure changes and their activity decreases. Even when there is no structural change, the activity is lower than that of cupric oxide, and it is invulnerable as a catalyst unless it is combined with other elements to improve its resistance to reduction. On the other hand, cupric oxide also has catalytic activity, and even if it is reduced to cuprous oxide during the reaction, it easily converts to cupric oxide if the temperature is above 300'C in air. As mentioned above, since the film is porous, cupric oxide can easily take in oxygen and catalytically oxidize and decompose oil, and can also prevent deterioration. It is.

In addition, copper carbonate, copper hydroxide, and copper vinegar decompose during firing and hardening to become cupric oxide. It is easy to create voids near the surface, which is advantageous for oxidative decomposition of dirt.

Next, the metal porous body with the above film formed on its surface has a pore diameter of several hundreds of micrometers and has continuous pores, so it is more effective at absorbing and diffusing oil than conventional porous bodies with discontinuous pores due to foaming. It has much better properties and oxygen diffusivity. Therefore, it is suitable for exhibiting the catalytic action of the above-mentioned film.

By forming a film having a catalytic action as described above on the surface of a porous metal body to serve as a wall material and placing it inside a cooking appliance, it becomes possible to catalytically decompose and purify dirt caused by cooking.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

Fig. 1 is a cross-sectional view of a cured paint film according to the present invention and a wall material in which the cured paint film is formed on the surface of a porous metal body.
is silica/alumina fiber, 3 is oxidized di(CuO),
4 is aluminum long fiber.

Figure 2 is an enlarged view of the aluminum long fiber wall material 5 shown in Figure 1 with a cured paint film formed on its surface. ~
The aluminum long fiber 4 has a diameter of several 10 μm.
Several 100 μm in length, several tens of micrometers in length, and the thickness of the coating is approximately 20 μm.
m or less.

FIG. 3(a) is a perspective view of a cooking device (6) in which the wall material (5) shown in FIG. 2 is installed in the cooking chamber, and FIG.
It is an enlarged front view of the A section in figure (a), that is, the wall material (5). In Figures 3 and 3), (7) is an aluminum expanded metal provided to reinforce the aluminum long fibers, and a cured paint film is also formed on its surface.

Hereinafter, the functions and effects of the cured paint film shown in FIGS. 1, 2, and 3 and the cooking appliance having the same will be explained.

First, the paint effect film will be explained. As a conventional example, a film having a catalytic action consisting of an inorganic phosphate and a metal oxide was used. The table below shows the catalyst in the film and the results of the decomposition and purification test using salad oil as a representative example of oil.The 0 decomposition and purification test involves forming a hardened paint film on the surface of a porous body made of aluminum long fiber laminate. 100 meals x 1
Using a test piece of 00 × 0.7 Kaku, the test method was to drop about 0.1 g of salad oil on the test piece at 5 points, and leave it in an electric furnace at 350°C for 15 minutes for one cycle. In Table 0, FkL1 to 7 are according to the present invention, and 90 parts by weight of polyborotitanosiloxane and 20 parts by weight of silica/alumina fiber are common, so they are not included in the table.
In addition, the firing was performed at 450°Cl2O minutes.
The copper compound No. 7 becomes CuO by firing and hardening.

Below Margin As is clear from the above table, it is preferable to have a large amount of CuO, but if it is too large, the film becomes brittle, so 60-100 parts by weight is preferable.
It can be seen that the catalytic action of CuO and the overall structure of the porous test piece contribute to decomposition and purification. In the table, N
This is also supported by the fact that when the A4 coating was formed on an aluminum flat plate and a decomposition and purification test was conducted, tar residue was found in one cycle.

Next, it was confirmed by X-ray diffraction that the catalyst CuO does not change its structure before and after the reaction.For example, Mr20. and the activity decreased.

Regarding the fibrous inorganic substance in the coating, in addition to silica and alumina, zirconia, silicon carbide, and carbon can also be used, and long fibers of these can be crushed into short pieces.

Further, as for the metal porous body, stainless steel may be used instead of aluminum, and both of these are continuous porous bodies. In the case of stainless steel, the fiber diameter may be smaller than that of aluminum, but both have a porosity of 50% or more and are suitable for exerting a catalytic action.

Next, we tried to break down the dirt by actually roasting saury in the cooker shown in Figure 3(a). The test is 4 saury at one time.
After grilling the fish five times in a row, the dirt was broken down by dry baking for 30 minutes. During dry baking, the temperature of the inner wall of the cooking chamber rises to 280 to 400°C after 30 minutes.

If you repeat this as one cycle, the low temperature (
(about 280 to 300°C), tar residue remains,
Overall, it was found that purification was better than conventional methods. However, the coating used here is that of grade 4 in the table.

Effects of the Invention As described above, the cured paint film of the present invention and the cooking appliance having the same provide the following effects.

(1) The cured paint film of the present invention is a mixture of polyborotitanosiloxane or polyborosiloxane, a fibrous inorganic material, one or more copper compounds, and a solvent, and is cured by baking. It becomes a porous film that is easily
Furthermore, since it contains cupric oxide, which has strong resistance to reduction, as a catalyst, it has high catalytic activity and little deterioration of catalytic activity.

(2) Since the cooking device of the present invention has at least one wall material in the cooking chamber on which the cured paint film described in (1) above is formed on the surface of the metal porous body, dirt generated during cooking can be effectively cleaned. can.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of a wall material in which a cured paint film according to the present invention is formed on a metal porous body, Fig. 2 is an enlarged front view of a wall material in which a cured paint film is also formed, and Fig. 311ffl(a)
Figure 3 is a perspective view of a cooking appliance in which wall material is applied to the walls of the cooking chamber.
1D(b) is an enlarged front view of section A in FIG. 3(a). ■...Calcination cured product of polyborotitanosiloxane, 2...Silica/alumina fiber (fibrous inorganic substance), 3...Cupric oxide, 4... ... Aluminum length & Li fiber (metal porous body), 5 ... Wall material, 6 ... Cooking device.

Claims (2)

[Claims] (1) Polyborotitanosiloxane composed of silicon, boron, titanium and oxygen or polyborosiloxane composed of silicon, boron and oxygen, fibrous inorganic substance, cupric oxide, copper carbonate, hydroxide A cured paint film obtained by baking and curing a paint mixture of one or more copper compounds among copper and copper acetate, and the polyborotitanosiloxane or a solvent that dissolves the polyborosiloxane. (2) A cooking device having at least one wall material in the cooking chamber, the wall material having the cured paint film according to claim 1 formed on the surface of a metal porous body.