JP2833142B2 - Paint cured film and cooker having the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cured paint film for purifying stains generated from cooking appliances for home use, business use, and the like, and a cooking appliance having the same.

2. Description of the Related Art Conventionally, there have been mainly three methods for purifying dirt generated from a cooking device.
The second method is to decompose dirt by heating to ~ 500 ° C. The second method is to form a film containing a catalyst such as a transition metal oxide or zeolite having a catalytic action on the wall surface of the cooking chamber and decompose the dirt by catalytic action. Third, a non-adhesive film is formed on the inner wall of the cooking chamber, and the adhered dirt is wiped off.

Problems to be Solved by the Invention However, the above conventional technology has the following problems.

In the first thermal decomposition method, a high temperature is applied for a long time, so that thermal degradation and safety of electronic components and the like are problems. In the second thermal decomposition method, the catalyst is covered by a binder in a coating film. However, high activity is not obtained, and the decomposition of dirt becomes incomplete, and there is a problem that part of the catalyst is reduced during the reaction and deteriorates. Is low in heat resistance.

An object of the present invention is to solve such problems and to provide a cured coating film for purifying dirt due to a catalytic action and a cooker having the same.

Means for Solving the Problems In order to achieve the above object, 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 material. Inorganic substances, cupric oxide (CuO), copper carbonate (CuCO ₃ ), copper hydroxide [Cu (OH) ₂ ]
A mixture of one or more compounds of copper and copper acetate [Cu (OOCCH ₃ ) ₂ ] and a solvent is baked and cured to form a cured porous coating film having a catalytic action. Further, this paint cured film is formed on the surface of the porous metal body to form a wall material,
The cooking device has at least one wall material in the cooking chamber.

By the above-mentioned means, polyborotitanosiloxane or polyborosiloxane is a binder, and it is difficult to form a film by itself by sintering and curing. Moreover, it is easy to become a porous film. In particular, fibrous minerals increase porosity. The reason for this is that the fibers are straight, so that the fibers are entangled with each other in the coating, and voids are easily formed.

It is an oxidation reaction to decompose oil stains, which are typical stains due to cooking, by catalytic action, and the presence of oxygen is important. The oxygen is supplied from the air, and a porous coating is desired to take in more oxygen.
Therefore, the coating obtained as described above is suitable.

In addition, cupric oxide, which acts as a catalyst, impregnates the powder with oil (eg, salad oil) and heats it in air (approximately
(300-350 ° C), the oil is oxidatively decomposed, but there is no structural change before and after the reaction. Other fiber metal oxides such as manganese and cobalt are easily reduced during the reaction, change their structure and decrease their activity, and even when there is no structural change, their activity is lower than that of cupric oxide, and they can be combined with other elements. Unless the reducibility is improved by such a method, the catalyst is invulnerable. On the other hand, cupric oxide has activity as a catalyst, and even if reduced to cuprous oxide during the reaction, it is easily converted to cupric oxide immediately in air at 300 ° C or higher. It is hardly deteriorated because it is reoxidized. As described above, since the coating is porous, cupric oxide can easily take in oxygen to catalytically oxidize and decompose oil and prevent deterioration.

Copper carbonate, copper hydroxide, and copper acetate are decomposed during sintering to form cupric oxide, while gases (eg, CO ₂ , H ₂ O) generated during decomposition decompose cupric oxide. Voids are easily formed near the surface, which is advantageous for oxidative decomposition of dirt.

Next, since the porous metal body having the above-mentioned coating formed on the surface has a void diameter of several 100 μm and is a continuous hole, the absorption and diffusion of oil are larger than the conventional porous body having non-continuous pores due to foaming. The properties and oxygen diffusivity are much better. Therefore, it is suitable for exhibiting the catalytic action of the coating.

By forming a film having a catalytic action as described above on the surface of the porous metal body to form a wall material and disposing the film in the cooking chamber, it becomes possible to catalytically decompose and purify dirt due to cooking.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a cured coating film of the present invention and a wall material in which the cured coating film is formed on the surface of a porous metal body. In the drawing, 1 is a fired cured product of polyborotitanosiloxane;
2 is silica-alumina fiber, 3 is cupric oxide (CuO),
4 is an aluminum long fiber.

FIG. 2 is an enlarged view of a wall material 5 made of an aluminum long fiber having a cured coating film shown in FIG. 1 formed on its surface. The silica-alumina fiber 2 shown in FIG. 1 has a diameter of several μm and a length of several tens. ~
Several hundred μm, diameter of aluminum long fiber 4 is several tens to several hundreds
μm, the length is several tens of mm, and the thickness of the coating is about 20 μm or less.

FIG. 3 (a) is a perspective view of a cooker (6) provided with the wall material (5) shown in FIG. 2 in a cooking chamber, and FIG. 3 (b) is a portion A in FIG. 3 (a). That is, it is an enlarged front view of the wall member (5). In FIG. 3 (b), (7) is an aluminum expanded metal provided to reinforce the aluminum long fiber, and a cured coating film is formed on the surface of the expanded metal.

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

First, the paint effect coating will be described. As a conventional example, a film having a catalytic action composed of an inorganic phosphate and a metal oxide was used. The table below shows the catalyst in the coating and the results of the decomposition and purification tests using salad oil as a typical example of oil. In the decomposition and purification test, a paint cured film was formed on the surface of a porous body made of aluminum long fiber laminate, 100 mm × 100
Using a test piece of mm × 0.7mm, the test method is to drop about 0.1 g of salad oil into 5 points on the test piece,
One cycle was left in an electric furnace at 0 ° C. for 15 minutes. N in the table
Nos. 1 to 7 are according to the present invention and are not shown in the table because 90 parts by weight of polyborotitanosiloxane and 20 parts by weight of silica-alumina fiber are common. The firing was performed at 450 ° C. for 20 minutes. In the table, the copper compounds of Nos. 5 to 7 are cured by firing.
It becomes CuO.

As is clear from the above table, it is preferable that the amount of CuO is large, but if it is too large, the coating becomes brittle, and 60 to 100 parts by weight is desirable. In the table, No. 4 is superior to the conventional example, and CuO
It can be seen that the catalytic action of the above and the overall structure of the porous test piece contributed to decomposition and purification. In the table, the coating No. 4 was formed on an aluminum flat plate and subjected to a decomposition and purification test, which proves that tar residues were found in one cycle.

Next, it was confirmed by X-ray diffraction that the catalyst itself, CuO, did not change its structure before and after the reaction. For example, similarly active MrO ₂ was reduced to Mr ₂ O ₃ and the activity decreased.

As the fibrous inorganic substance in the coating, zirconia, silicon carbide, and carbon can be used in addition to silica / alumina, and these long fibers can be used after being ground short.

The metal porous body may be stainless steel in addition to aluminum, and these are all continuous porous bodies. In the case of stainless steel, the fiber diameter may be smaller than that of aluminum, but all have a porosity of 50% or more and are suitable for exerting a catalytic action.

Next, the saury was actually baked in the cooker shown in FIG. In the test, four saury were baked at a time, and after continuing five times, the soil was decomposed by baking for 30 minutes. During empty baking, the temperature of the cooking indoor wall will be 30 minutes later
Increase to 280-400 ° C. When this was repeated as one cycle, it was found that tar residues remained in the low temperature (about 280 to 300 ° C.) portion during the baking, but it was found that the purification could be better as a whole as compared with the conventional method. However, the coating used here is
No. 4 in the table.

Effects of the Invention As described above, according to the cured paint film of the present invention and the cooking device having the same, the following effects can be obtained.

(1) The cured coating film of the present invention comprises a polyborotitanosiloxane or polyborosiloxane, a fibrous inorganic substance,
Baking and hardening paint mixed with one or more copper compounds and a solvent, resulting in a porous film that can be easily supplied with air, and because it contains cupric oxide, which has a strong reducibility as a catalyst, catalytic activity And the catalyst activity is less deteriorated.

(2) The cooker according to the present invention is characterized in that (1)
Since the cooking chamber has at least one surface of the wall material on which the above-described paint cured film is formed, dirt generated during cooking can be satisfactorily purified.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a wall material in which a cured paint film according to the present invention is formed on a porous metal body, FIG. 2 is an enlarged front view of the same wall material having a cured paint film formed thereon, and FIG. Fig. 3 (b) is a perspective view of a cooker in which ingredients are applied to a cooking chamber inner wall.
FIG. 4 is an enlarged front view of a portion A in FIG. 1 ... baked and cured product of polyborotitanosiloxane, 2 ...
Silica / alumina fiber (fibrous inorganic material), 3 ... cupric oxide, 4 ... aluminum long fiber (porous metal), 5
... wall materials, 6 ... cookers.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F24C 14/00 F24C 14/00 C (72) Inventor Makiko Waki 1006 Ojidoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 56) References JP-A-2-53871 (JP, A) JP-A-3-174246 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47J 36/02 B01J 21/00 -38/74 B05D 5/00 C09D 183/14 F24C 14/00

Claims (2)

(57) [Claims] 1. A polyborotitanosiloxane or silicon composed of silicon, boron, titanium and oxygen,
A polyborosiloxane composed of boron and oxygen, a fibrous inorganic substance, cupric oxide, copper carbonate, a compound of one or more copper of copper hydroxide and copper acetate, and the polyborotitanosiloxane or A paint cured film formed by baking and curing a paint mixed with a solvent that dissolves polyborosiloxane. 2. A cooker having at least one wall surface material in which a paint cured film according to claim 1 is formed on the surface of a porous metal body.