JPH09133366A - Film for high-temperature cooker, manufacture thereof and oven case for the cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of red rust on a stainless steel plate and to effectively prevent the scorch of food by forming the film formed on a base material of a primary coating film of an aluminum pigment-filled silicone resin paint and an overcoating film of a heat resistant coloring pigment-filled silicone resin paint. SOLUTION: This film for a high-temperature cooker to be formed on the wall surface of the heating chamber of an oven range or the like is formed in a two-layer structure of a primary coating film 2 having heat resistance and corrosion resistance and an overcoating film 3 on a base material 1. As the material 1, a low quality level stainless steel plate which has been pretreated is used. An aluminum pigment-filled silicone resin paint is used for the film 2, and a heat resistant coloring pigment-filled silicone resin paint is used for the film 3. Such a film for the cooker is formed by cleaning the surface of the material 1 for constituting the wall surface of the chamber, then coating it with the aluminum pigment-filled paint, then coating it with the heat resistant coloring pigment-filled paint so as to cover it, and then baking to dry it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film excellent in heat resistance and corrosion resistance, particularly to a film for a high temperature cooker formed on the wall surface 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 heating cooker is shown in FIGS. However, FIG. 5 is a perspective view of the microwave oven, and FIG. 6 is a perspective view of the inner box used in the microwave oven.

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

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

In the microwave oven 11 having such a structure, a stainless steel plate having heat resistance and corrosion resistance (SUS304, SUS430, etc.) or a steel plate finished with enamel is used for the wall surface of the inner box 14 and tetrafluoride. A heat-resistant polymer composition composed of 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.

By the way, in the development of a high-temperature, high-speed cooker, it is necessary to shorten the cooking time in order to improve the taste of cooked food and to effectively use the time. That is, since it is necessary to treat food products at a high temperature, the wall surface of the inner box 14 of the microwave oven 11 has a high-grade stainless steel plate (SUS304, SUS) having excellent heat resistance and corrosion resistance.
430 etc.) had to be used.

Recently, the inner box 14 of the microwave oven is used.
, The organic solvent varnish with 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 to improve the heat-resistant oxidation resistance, the corrosion resistance, and the cleanability, and also prevent the food from sticking (this is referred to as Prior Art 1).

In order to further improve the above-mentioned conventional technique 1, a paint containing the above-mentioned polytitanocarbosilane as a binder and a fluororesin powder having a good compatibility with each other in an amount of 20% or less are added to the paint. A technique for forming the uppermost layer has been developed (see Japanese Patent Application Laid-Open No. 2-282626: This is referred to as Prior Art 2).

[0009] In the prior arts 1 and 2 as described above, heat and oxidation resistance and corrosion resistance can be secured, and the attachment of dirt can be easily removed, but there is a problem that the cost becomes expensive.

Therefore, the inner box 14 of the microwave oven 11
As a wall material for, high-grade stainless steel plate (SUS30
4, SUS430, etc.) is inferior in heat resistance and corrosion resistance, but low-grade stainless steel plate (SUS41) that can be provided at low cost.
0, SUS409, etc.) has been conventionally studied.

[0011]

An inner box of a microwave oven was produced using this low-grade stainless steel plate, and a coating film was formed by a conventional coating film forming method, and an experiment was conducted.
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 low-grade stainless steel plate is coated with a commercially available silicon heat-resistant general-purpose primer to form a lower coating film,
After that, a coating film was formed by a conventional method for forming a coating film, and an experiment was conducted. The result was the same as in the above case. As described above, the improvement technique in the case of manufacturing the inner box of the microwave oven by using the low-grade stainless steel plate has not yet been established.

The present invention was devised to solve the above problems, and its object is to maintain the characteristics of a low-grade stainless steel sheet which is inferior to the high-grade stainless steel sheet in heat resistance and corrosion resistance but is inexpensive. Another object of the present invention is to provide a film for a high-temperature cooker capable of ensuring the adhesion performance of a coating film and suppressing the occurrence of remarkable red rust after a corrosion resistance test, and a method for producing the film.

[0014]

In order to solve the above-mentioned problems, the film for a high temperature cooker according to claim 1 of the present invention is a film formed on a base material constituting a wall surface of a heating chamber of the high temperature cooker. That is, it is composed of a lower coating film of a silicon resin paint containing an aluminum pigment and an upper coating film of a silicon resin paint containing a heat resistant coloring pigment.

According to a second aspect of the present invention, in the method for producing a film for a high temperature cooker, after cleaning the surface of the base material constituting the wall surface of the heating chamber of the high temperature cooker, a silicone resin coating containing an aluminum pigment is applied. Then, a silicon resin coating material containing a heat-resistant coloring pigment is applied so as to cover the applied aluminum pigment-containing silicon resin coating material, and then baked and dried to form a two-layer structure film on the base material. Is formed.

By the action of aluminum contained in the lower coating film as a heat-resistant pigment, pinholes in the coating film generated during baking and drying are reduced, invasion of chlorides causing corrosion is prevented, and sacrificial corrosion prevention is performed. Play the role of. Also,
Prevents the generation of red rust from the stainless steel material that is the base material. Further, it exhibits strong adhesion to the upper coating film formed by baking and drying simultaneously with the lower coating film. Therefore, the chemical resistance, corrosion resistance, and cleanability of the upper coating film are improved, and at the same time, the coating film performance such as preventing the food from sticking is improved.

In the oven box of the high temperature cooker according to claim 3 of the present invention, the heating chamber wall surface of the high temperature cooker is formed of a low-grade stainless material, and the stainless steel material is provided on the heating chamber wall surface side. A film having heat resistance and corrosion resistance is formed.

According to a fourth aspect of the present invention, there is provided an oven box body for a high-temperature cooker according to the third aspect, wherein the coating is an undercoating film of a silicone resin coating containing aluminum pigment and a heat-resistant coating. It is formed by an upper coating film of a silicone resin paint containing a coloring pigment.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in the state of being incorporated in a microwave oven.

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

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

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

The lower coating film 2 is made of a silicone resin paint containing aluminum pigment (eg, # HK-100 manufactured by Okitsumo Co., Ltd.).
0 (silver)) is used. Further, for the upper coating film 3, a silicone resin coating material containing a heat resistant color pigment (for example, # 6482 manufactured by Okitsumo Co., Ltd.) is used.

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

On the base material 1 which is a low-grade stainless steel plate pretreated by sandblasting, solvent degreasing, alkali degreasing, etc., a silicon-based resin paint containing aluminum pigment as the lower coating film 2 is finished to a thickness of 3 to 10 μm. Then, the lower coating film 2 is spray-coated with a silicone resin coating containing a heat-resistant coloring pigment to form the upper coating film 3 to a final thickness of 15 μm.

After that, preliminary drying is performed at 100 ° C. for 10 minutes or more, and then sintering is performed at a temperature of 380 ° C. for 10 to 20 minutes.

Through these steps, the film for a high temperature cooker having the 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 the same low-grade stainless steel plate (SUS4)
FIG. 2 shows a comparison result of heat resistance and corrosion resistance with the conventional coating film for a high temperature cooker formed by coating in 10). However, the conditions for forming both films are as shown in FIG. The undercoat paint and the overcoat paint in the table shown in FIG. 3 are all manufactured by Okitsumo Co., Ltd.

From the comparison results shown in FIG. 2, the heat resistance performance of the high temperature cooker film of the present invention and the conventional high temperature cooker film are sufficiently provided. It can be seen that the coating is superior to conventional coatings for high temperature cookers.

That is, in the coating film for a high temperature cooker of the present invention, the lower coating film 2 is formed to have a thickness of 3 to 10 μm, and the upper coating film 3 is formed with 15
When it is formed to have a thickness of not less than μm, it exhibits an excellent effect as shown in FIG.

Next, the coating film for a high temperature cooker according to the present invention is shown in FIG.
The case of forming it on the wall surface of the inner box 14 of the microwave oven shown in FIG. 7 will be described.

The inner box 14 has a low-grade stainless steel plate (S
US410) is used.

First, the left and right side walls 15 of the inner box 14,
16, each of the inner surfaces of the top plate 17, the bottom plate 18, and the back plate 19 and the front face of the front plate 20 are coated with an aluminum pigment-containing silicon resin paint serving as the lower coating film 2 so as to have a finished thickness of 3 to 10 μm. Apply by spraying.

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 is deteriorated when the upper coating film 3 is formed. Therefore, 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 parts) (not shown) provided for exhaust, etc. You need to be careful.

Further, since the end surface of the hole-processed portion is largely exposed during the processing, hot air containing steam is circulated and exhausted during cooking, so that the inner box 14 has an anticorrosion property. Is the required part of.

Further, since it is difficult to reliably apply the end surface of the hole-processed portion only by applying from the inner surface of the inner box 14, it is necessary to apply the silicon pigment resin coating containing aluminum pigment to the outer surface of this portion. Is desirable. In this way, by applying the hole-processed portion from the outer surface, it becomes possible to suppress rusting from the end surface of the hole-processed portion which is easily corroded. The silicon resin coating containing aluminum pigment for the lower coating film 2 does not need to be forcedly dried with hot air or the like.

Next, on the lower coating film 2 thus formed, a silicon resin coating material containing a heat-resistant coloring pigment to form the upper coating film 3 is finished to a thickness of 15 μm or more (desirably 20 to 3).
Spray coating to give a finished thickness of 0 μm).

At this time, if the finished thickness of the high-temperature heat irradiation hole portion 21 and the hole processing portion (punching portion) provided for exhausting etc. is too thick, the appearance of the coating finish deteriorates after the final baking, and the coating finish is deteriorated. Since the physical properties of the film deteriorate, it is necessary to take care so that the coating film at these locations does not become too thick.

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

If the final baking is performed by omitting the preliminary drying step, the solvent contained in the paint may evaporate violently and the appearance of the finished coating film may deteriorate.
In particular, since it is applied and 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 as compared with a flat plate coating portion or the like on the outer surface. For this reason, the preliminary drying step is a necessary step. The pre-drying may be performed at a high temperature of, for example, about 160 degrees Celsius, but if a coating failure occurs, it is difficult to carry out pre-work (correction and surface roughening performed with sandpaper etc.) ( That is, since the coating film becomes harder as it hardens), the best condition is 10 to 15 minutes at about 100 degrees Celsius.

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

The coating performance of the high temperature cooker coating formed on the inner surface of the inner box 14 through the above steps is shown in FIG.
It is shown as a list in.

As shown in the list of coating performances in FIG. 4, the coating for a high temperature cooker of the present invention exhibits good performance as a coating for the inner box 14 of the microwave oven.

In the above-mentioned embodiment, the 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-based materials other than the low-grade stainless steel plate are used. The coating for a high-temperature cooker of the present invention can be used on an aluminum alloy-plated steel plate, an aluminum-plated steel plate and the like.

[0045]

EFFECTS OF THE INVENTION The coating film for a high temperature cooker of the present invention has a two-layer structure consisting of an undercoating film of a silicon resin paint containing an aluminum pigment and an upper coating film of a silicon resin paint containing a heat-resistant coloring pigment. Even when low-quality stainless steel plate is used as the material, it is possible to prevent the occurrence of red rust from the stainless steel plate, and the chemical resistance, corrosion resistance and cleanability of the top coating film are sufficiently secured to prevent food sticking. The coating film performance does not deteriorate.

Further, in the method for producing a film for a high-temperature cooker of the present invention, after cleaning the surface of the base material constituting the wall surface of the heating chamber of the high-temperature cooker, the aluminum resin-containing silicone resin paint is applied, and then, Then, the heat-resistant coloring pigment-containing silicon resin coating material is applied so as to cover the applied aluminum pigment-containing silicon resin coating material, and then baked and dried to form a two-layer structure film on the base material. That is, it is possible to form a strong coating film that does not cause peeling by forming an upper coating film on the lower coating film without preliminary drying and only by preliminary drying and final baking after coating the upper coating film. Also, by the action of aluminum contained as a heat resistant pigment in the lower coating film, pinholes in the coating film generated during baking and drying can be reduced, and the entry of chloride etc. that causes corrosion can be reliably prevented. it can. Therefore, it serves as sacrificial anticorrosion, and it is possible to reliably prevent the generation of red rust from the stainless steel material that is the base material. Furthermore, since it exhibits strong adhesion to the upper coating film formed by baking and drying at the same time as the lower coating film, the chemical resistance, corrosion resistance and cleanability of the upper coating film are improved, It also improves coating film performance such as preventing burning.

Further, in the oven box of the high-temperature cooker of the present invention, the heating chamber wall surface of the high-temperature cooker is formed of a low-grade stainless material, and the stainless steel material has heat resistance and corrosion resistance on the heating chamber wall surface side. Since a film consisting of the coating film that has, that is, the lower coating film of the silicone resin paint containing aluminum pigment and the upper coating film of the silicon resin coating containing heat-resistant coloring pigment, was formed, the oven box body was formed from a low-grade stainless steel material. However, the adhesion performance of the coating film can be secured and the occurrence of remarkable red rust can be suppressed. Therefore, the manufacturing cost can be reduced.

[Brief description of the drawings]

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

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

FIG. 3 is a list showing conditions for forming a coating for a high temperature cooker of the present invention and a coating for a conventional high temperature cooker.

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

FIG. 5 is a perspective view showing an example of a microwave oven which is a high temperature heating cooker.

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

[Explanation of symbols] 1 base material 2 lower coating film 3 upper coating film 14 box

Claims (4)

[Claims] 1. A film formed on a base material constituting a wall surface of a heating chamber of a high-temperature cooker, which comprises an undercoat film of a silicon-based resin paint containing an aluminum pigment and a silicon-based resin paint containing a heat-resistant coloring pigment. A film for a high-temperature cooker, which comprises an upper coating film. 2. A surface of a base material constituting a wall surface of a heating chamber of a high-temperature cooker is washed, and then a silicon-based resin coating containing aluminum pigment is applied, and then the applied silicon-based resin coating containing aluminum pigment is covered. A method for producing a film for a high-temperature cooker, which comprises applying a silicone resin coating material containing a heat-resistant coloring pigment in this manner, followed by baking and drying to form a film having a two-layer structure on the substrate. 3. The heating chamber wall surface of the high-temperature cooker is formed of a low-grade stainless material, and a coating having heat resistance and corrosion resistance is formed on the heating chamber wall surface side of the stainless material. Oven box of high temperature cooker. 4. The high-temperature cooker according to claim 3, wherein the film comprises an undercoat film of an aluminum pigment-containing silicone resin paint and an overcoat film of a heat-resistant coloring pigment-containing silicone resin paint. Oven box.