JP3304249B2 - Coating for high-temperature cooker, method for producing the same, and oven box of high-temperature cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film having excellent heat resistance and corrosion resistance, and more particularly to a film for a high-temperature cooker formed on a wall of a heating chamber of the high-temperature cooker.

[0002]

2. Description of the Related Art An example of a microwave oven which is a high-temperature cooking device is shown in FIGS. FIG. 5 is a perspective view of a microwave oven, and FIG. 6 is a perspective view of an inner box used in the microwave oven.

The microwave oven 11 includes a main body 12 and a door 13, and an inner box 14 is incorporated in the main body 12.

The inner box 14 includes left and right side walls 15 and 16, a top plate 17, a bottom plate 18, a back plate 19 and a front plate 20. The top plate 17 is provided with a high-temperature heat irradiation hole portion 21 having a plurality of holes for introducing heat of a heater (not shown) provided on the top plate 17 into the inner box 14. Have been.

In the microwave oven 11 having such a configuration, a stainless steel plate (SUS304, SUS430, etc.) having heat resistance and corrosion resistance, an enamel-finished steel plate is used for the wall surface of the inner box 14, and tetrafluoride is used. A heat-resistant polymer composition comprising a binder such as an ethylene resin, a PES resin, a silicon resin, and a polysiloxane resin, an inorganic pigment and a filler, or a heat-resistant metal coated with a ceramic is used.

Meanwhile, in the development of a high-temperature and high-speed cooker, it is necessary to shorten the cooking time in order to improve the taste of the cooked food and to make effective use of the time. That is, since it is necessary to treat foodstuffs at high temperatures, the wall surface of the inner box 14 of the microwave oven 11 is provided with a high-grade stainless steel plate (SUS304, SUS304) having excellent heat resistance and corrosion resistance.
430 etc.).

Recently, the inner box 14 of a microwave oven has been used.
On the walls and the like, an organic solvent varnish using polytitanocarbosilane as a binder, a heat-resistant pigment made of a heat-resistant metal oxide or a composite oxide, and a paint containing a paint additive are applied and baked. A technique has been developed which aims to improve the thermal oxidation resistance, the corrosion resistance and the cleanability, and also to prevent the food from burning (this is referred to as Conventional Technique 1).

[0008] In order to further improve the prior art 1, a paint obtained by adding a fluororesin powder which is familiar with the above-mentioned paint using polytitanocarbosilane as a binder in a blending amount of 20% or less is used. A technique formed on the uppermost layer has been developed (see Japanese Patent Application Laid-Open No. 2-282626: this is referred to as Conventional Technique 2).

In the prior arts 1 and 2, such heat and oxidation resistance and corrosion resistance can be ensured, and the adhesion of dirt can be easily removed. However, there is a problem that the cost becomes high.

Therefore, the inner box 14 of the microwave oven 11
Of high-grade stainless steel sheet (SUS30
4, SUS430, etc.), which are inferior in heat resistance and corrosion resistance but can be provided at low cost.
0, SUS409, etc.) have been studied.

[0011]

As a result of producing an inner box of a microwave oven using this low-grade stainless steel plate, forming a coating film by a conventional coating film forming method, and conducting an experiment,
The adhesion performance of the coating film was insufficient, and the generation of red rust after the corrosion resistance test could not be suppressed.

Therefore, a commercially available silicon-based heat-resistant general-purpose primer is applied to a low-grade stainless steel sheet to form an undercoat,
Thereafter, an experiment was carried out by forming a coating film by a conventional coating film forming method, and the results were the same as those described above. As described above, at present, an improved technique for manufacturing an inner box of a microwave oven using a low-grade stainless steel plate has not yet been established.

The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to maintain the characteristics of a low-grade stainless steel sheet which is inferior in heat resistance and corrosion resistance to a high-grade stainless steel sheet, but is inexpensive. It is another object of the present invention to provide a coating film for a high-temperature cooker which can ensure the adhesion performance of a coating film and can suppress the occurrence of remarkable red rust after a corrosion resistance test, and a method for producing the same.

[0014]

In order to solve the above-mentioned problems, a film for a high-temperature cooker according to the first aspect of the present invention is a film formed on a base material constituting a wall of a heating chamber of the high-temperature cooker. It comprises a lower coating film of a silicon-based resin paint containing an aluminum pigment and an upper coating film of a silicon-based resin paint containing a heat-resistant coloring pigment.

According to a second aspect of the present invention, there is provided a method for producing a film for a high-temperature cooker, comprising: cleaning a surface of a base material constituting a wall of a heating chamber of the high-temperature cooker; Then, a silicon-based resin paint containing a heat-resistant coloring pigment is applied so as to cover the applied silicone-based resin paint containing an aluminum pigment, and then baked and dried to form a two-layered film on the substrate. Is formed.

The effect of aluminum contained as a heat-resistant pigment in the undercoat reduces the number of pinholes in the coating during baking and drying, thereby preventing entry of chlorides and the like that cause corrosion and sacrificial corrosion protection. Serve the role of. Also,
Prevents the generation of red rust from the stainless steel material that is the base material. Furthermore, it exhibits strong adhesion to the upper coating film formed by baking and drying simultaneously with the lower coating film. For this reason, the chemical resistance, corrosion resistance, and cleanability of the upper coating film are improved, and the coating film performance of preventing the food from burning is also improved.

In the oven box of the high-temperature cooker according to the third aspect of the present invention, the heating chamber wall of the high-temperature cooker is formed of a low-grade stainless steel material, and the stainless steel material is provided on the heating chamber wall side. , the undercoat film of silicon-based resin paint containing aluminum pigment as heat pigments, chemical resistance, heat coloration pigmented silicone-based resin having corrosion resistance and cleanability
This is a film having a two-layer structure composed of an upper coating film of a fat paint .

[0018]

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described as being incorporated in a microwave oven.

FIG. 1 is a sectional view of a coating for a high-temperature cooker according to the present invention.

That is, a film having a two-layer structure composed of a lower coating film 2 and an upper coating film 3 having heat resistance and corrosion resistance is formed on the substrate 1.

The substrate 1 includes sand blast, solvent degreasing,
A low-grade stainless steel plate (SUS410, SUS409, or the like) that has been pretreated by alkali degreasing or the like is used.

The lower coating film 2 is coated with a silicon-based resin paint containing an aluminum pigment (for example, HK-100 manufactured by Okitsumo Co., Ltd.).
0 (silver)). The upper coating film 3 is made of a silicon-based resin paint containing a heat-resistant coloring pigment (for example, # 6482 manufactured by Okitsumo Corporation).

Next, a method of manufacturing the coating for a high-temperature cooker having the above-described structure will be described.

On a base material 1 which is a low-grade stainless steel plate which has been pretreated by sand blasting, solvent degreasing, alkali degreasing, etc., a silicon-based resin coating material containing an aluminum pigment to be an undercoat film 2 has a finished thickness of 3 to 10 μm. The lower coating 2 is spray-coated on the lower coating 2 with a heat-resistant colored pigment-containing silicone resin paint to become the upper coating 3 so as to have a finished thickness of 15 μm.

After that, preliminary drying is performed at 100 degrees Celsius for 10 minutes or more, and then sintering is performed at 380 degrees Celsius for 10 to 20 minutes.

Through such a process, a coating for a high-temperature cooker having a sectional structure shown in FIG. 1 is formed.

Next, a low-grade stainless steel plate (SUS41)
0) and the coating for a high-temperature cooker of the present invention having the above-described structure, and a low-grade stainless steel plate (SUS4).
FIG. 2 shows a comparison result of the heat resistance and the corrosion resistance with the conventional film for a high-temperature cooker applied and formed in 10). However, the conditions for forming both films are as shown in FIG. In addition, the undercoat paint and the top coat paint in the table shown in FIG. 3 are all manufactured by Okitsumo Corporation.

From the comparison results shown in FIG. 2, the heat-resistant performance of both the high-temperature cooker film of the present invention and the conventional high-temperature cooker film is sufficiently provided. It can be seen that the film is superior to the conventional high-temperature cooker film.

That is, in the coating for a high-temperature cooker of the present invention, the lower coating 2 is formed to a thickness of 3 to 10 μm and the upper coating 3 is formed to a thickness of 15 μm.
By forming the layer to a thickness of at least μm, an excellent effect is exhibited as shown in FIG.

Next, the hot cooker coating of the present invention, FIG. 5
The case where it is formed on the wall surface of the inner box 14 of the microwave oven shown in FIG. 6 will be described.

In the inner box 14, a low-grade stainless steel plate (S
US410).

Then, first, the left and right side walls 15,
16, on the inner surfaces of the top plate 17, the bottom plate 18, and the back plate 19, and on the front surface of the front plate 20, a silicon-based resin paint containing an aluminum pigment to be the lower coating film 2 so as to have a finished thickness of 3 to 10 μm. Spray apply.

At this time, the finished thickness of the lower coating film 2 is 20
When the thickness is more than μm, the adhesion performance of the upper coating film 3 decreases when the upper coating film 3 is formed. For this reason, the finished thickness of the lower coating film 2 does not exceed 20 μm at the corners of the inner box 14, the high-temperature heat irradiation holes 21, and the holes (punching portions) (not shown) provided for exhausting and the like. You need to be careful.

The drilled portion has a large end face exposed during the drilling, and hot air containing water vapor is circulated and exhausted during cooking, so that the inside surface of the inner box 14 has corrosion resistance performance. Is the required part of

Also, it is difficult to apply the end face of the drilled portion reliably only by applying from the inner surface of the inner box 14, and therefore it is necessary to apply an aluminum pigment-containing silicone resin paint from the outer surface to this portion. Is desirable. In this way, by applying the drilled portion from the outer surface, it is possible to suppress rusting from the end face of the drilled portion that is easily corroded. It is not necessary to forcibly dry the silicon-based resin paint containing the aluminum pigment for the lower coating film 2 with hot air or the like.

Next, on the lower coating film 2 thus formed, a silicon-based resin coating material containing a heat-resistant coloring pigment to become the upper coating film 3 has a finished thickness of 15 μm or more (preferably 20 to 3 μm).
Spray coating so as to have a finished thickness of 0 μm).

At this time, if the finished thickness is too large, the appearance of the finished paint deteriorates after the final baking, and the appearance of the finished paint is deteriorated if the high-temperature heat irradiation hole 21 or the hole-formed portion (punched portion) provided for exhaust is used. Care must be taken that the coatings at these locations do not become too thick, as the physical properties of the film are reduced.

After applying the lower coating film 2 and the upper coating film 3 in this manner, preliminary drying is performed at 100 degrees Celsius for 10 minutes or more.

If the final baking is performed without the pre-drying step, the solvent contained in the paint may evaporate violently, and the appearance of the finished coating film may be deteriorated.
In particular, since the coating is formed on the inner surface of the inner box 14, the vapor of the solvent is trapped inside the inner box 14, so that the appearance deterioration is more likely to occur than in a flat-plated portion on the outer surface. For these reasons, the predrying step is a necessary step. The preliminary drying may be performed at a high temperature of, for example, about 160 degrees Celsius, but it is difficult to perform pre-repainting work (correction and roughening with a sandpaper or the like) in the event of a coating failure ( That is, the curing of the coating film proceeds and the coating film becomes harder).

Thereafter, at a temperature of 380 degrees Celsius, 10 to 20
Bake for a minute to finish.

The coating performance of the high-temperature cooker coating formed on the inner surface of the inner box 14 through the above process is shown in FIG.
Is shown in the following table.

As shown in the table of coating properties in FIG. 4, the coating for a high-temperature cooker of the present invention shows good performance as a coating for the inner box 14 of a microwave oven.

In the above embodiment, a low-grade stainless steel plate (SUS410) is used as the base material 1 and the inner box 14. However, in places where heat resistance is not so required, zinc-free stainless steel plates other than the low-grade stainless steel plate are used. The film for a high-temperature cooker of the present invention can be used for an aluminum alloy-plated steel plate, an aluminum-plated steel plate, and the like.

[0045]

The coating for a high-temperature cooker of the present invention has a two-layer structure consisting of a lower coating of a silicone resin paint containing an aluminum pigment and an upper coating of a silicone resin paint containing a heat-resistant coloring pigment. Even when a low-quality stainless steel plate is used for the material, it can prevent the generation of red rust from the stainless steel plate, and the chemical resistance, corrosion resistance, and cleanability of the upper coating film are sufficiently ensured, preventing food scorching. The coating film performance does not deteriorate.

Further, in the method for producing a film for a high-temperature cooker according to the present invention, after cleaning the surface of a base material constituting a wall of a heating chamber of the high-temperature cooker, a silicon-based resin paint containing an aluminum pigment is applied. Then, a silicon-based resin coating containing a heat-resistant coloring pigment is applied so as to cover the applied silicon-based resin coating containing an aluminum pigment, and then baked and dried to form a two-layer film on the substrate. That is, it is possible to form a strong film that does not cause peeling only by forming the upper coating film on the lower coating film without preliminary drying, and performing only the preliminary drying to the final baking after application of the upper coating film. In addition, by the action of aluminum contained as a heat-resistant pigment in the undercoat, the number of pinholes in the coating that occurs during baking and drying can be reduced, and the intrusion of chlorides and the like that cause corrosion can be reliably prevented. it can. Therefore, it plays a role of sacrificial corrosion prevention, and can reliably prevent the generation of red rust from the stainless steel material as the base material. Furthermore, since it exhibits strong adhesion to the upper coating film formed by baking and drying simultaneously with the lower coating film, the chemical resistance, corrosion resistance and cleanability of the upper coating film are improved, and The coating film performance such as prevention of scorching is also improved.

Further, the high-temperature cooking oven box of the present invention, the heating chamber wall surface of the high-temperature cooking and forming of a low-grade stainless steel material, the heating chamber wall surface side of the stainless steel material, aluminum as a heat-pigment And an undercoat containing
2 consisting of a top coat having chemical properties, corrosion resistance and cleaning properties
A film consisting of a layered film, that is, a lower coating film of a silicon-based resin paint containing aluminum pigment and a top coating film of a silicon-based resin paint containing heat-resistant coloring pigment was formed. Even if it is formed, the adhesion performance of the coating film is ensured, and the generation of remarkable red rust can be suppressed. That is, contained in the undercoat
Baked and dried by the action of aluminum, a heat-resistant pigment
Corrosion by reducing pinholes in the coating film generated during drying
Intrusion of chlorides, etc., which cause the problem, can be reliably prevented.
You. Therefore, it plays a role of sacrificial corrosion protection, and
It is possible to reliably prevent the generation of red rust from stainless steel.
it can. Furthermore, the lower coating has strong adhesion to the upper coating
The chemical resistance, corrosion resistance and cleanliness of the upper coating
Improves the scavenging properties and prevents the food from burning
The coating performance also improves. Thereby , there is an effect that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a film for a high-temperature cooker according to the present invention.

FIG. 2 shows the heat resistance and corrosion resistance of the coating for a high-temperature cooker of the present invention applied to a low-grade stainless steel plate (SUS410) and the conventional coating for a high-temperature cooker also applied to a low-grade stainless steel plate (SUS410). 9 is a list showing comparison results.

FIG. 3 is a table showing conditions for forming a film for a high-temperature cooker of the present invention and a film for a conventional high-temperature cooker.

FIG. 4 is a table showing the coating performance of the coating for a high-temperature cooker of the present invention.

FIG. 5 is a perspective view showing an example of a microwave oven that is a high-temperature cooking device.

FIG. 6 is a perspective view of a box used in a microwave oven.

[Explanation of symbols]

 Reference Signs List 1 base material 2 lower coating film 3 upper coating film 14 box

Claims (3)

(57) [Claims] 1. A coating film formed on a base material constituting a wall of a heating chamber of a high-temperature cooker, comprising a lower coating film of a silicon-based resin paint containing an aluminum pigment and a silicon-based resin coating containing a heat-resistant coloring pigment. A coating for a high-temperature cooker, comprising a top coating. 2. After cleaning the surface of a base material constituting a heating chamber wall surface of a high-temperature cooker, apply a silicon-based resin paint containing aluminum pigment, and then cover the applied silicone-based resin paint containing aluminum pigment. A method for producing a film for a high-temperature cooker, comprising applying a heat-resistant colored pigment-containing silicone resin paint, and then baking and drying to form a film having a two-layer structure on the substrate. 3. The heating chamber wall of the high-temperature cooker is formed of a low-grade stainless steel material, and a silicon-based resin paint containing an aluminum pigment as a heat-resistant pigment is coated on the heating chamber wall surface of the stainless steel material. Silicone resin coating with heat-resistant coloring pigment with film, chemical resistance, corrosion resistance and cleaning property
An oven box for a high-temperature cooker, characterized in that a two-layered film composed of a top coat of the food is formed.