JPH0556855A - Cooker - Google Patents

Abstract

PURPOSE:To obtain a cooker excellent in cleaning and clean properties by forming a coat film composed of polysiloxane containing specified heat-resistant crack-preventing agents on surface where dirt adheres through cooking. CONSTITUTION:As coating raw materials, 20-29wt.% of methyl polysiloxane having a three-dimensional reticulated molecular structure and 0.1-5wt.% of polysiloxane having a linear-chain molecular structure are used. As heat-resistant crack-preventing agents, flake substances or fibrous substances selected from mica powder, metal-oxide coated mica powder, graphite, talc, plate-like iron oxide pigment, flake metallic powder, and potassium titanate fiber are employed as essential components. Besides the above, coloring material, filler and additives are added, and the coating is applied on the surfaces of a top plate 3 and a drip plate 4 of a cooker or on the surface of a cooking compartment and heated to cure it. Thereby, the coating film itself does not change in color, and dirt that can not be wiped off is not formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking utensil such as a gas table and a microwave oven which heats and cooks cooking food, and the top plate of the cooking utensil and the cooking chamber are contaminated by juice, oil and the like from the cooking food. To prevent this.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional gas table, in which a grill portion is arranged in the center of a body 1, an upper surface is covered with a top plate 3, and burners 4 are provided on the left and right of the top plate 3. The cooking stove portion 7 composed of the soup saucer 5 and the Gotoku 6 was provided, and the grill portion 2 was used when fish was grilled, and the cooked food and other foods were cooked on the cooking stove portion 7.

[0003]

In the conventional gas table described above, the top plate 3 and the soup tray 5 are made of, for example, a stainless material, a enamel coating on the surface, or a fluororesin processing in consideration of heat resistance and wiping of contaminants. Although the one (for example, Japanese Utility Model Laid-Open No. 64-41804) is used, the enamel coated product is expensive and has a drawback that the total weight is significantly increased, and the surface is made hard so that the metal is used. There is a defect that cracks etc. will occur when objects hit, and the fluororesin processed one has the drawback that the fluororesin will peel off when wiped with a resin scrubber etc. Recently, stainless steel has become the majority. There is.

However, even with this product, if a pot or the like is placed on the stove portion 7 and the cooking is repeated, the juice, oil, soot, etc. from the food will eventually stick to the product and will not fall off even if wiped off.

This is also true of other cooking utensils such as a microwave oven, so that juice and oil from foods will stick to the inside of the cooking cabinet and will not fall off even if wiped off. Immediate countermeasures are required. ..

[0006]

The present invention has been made to solve the above-mentioned drawbacks, and is a methylpolysiloxane having a three-dimensional network molecular structure and a linear molecular structure on the surface to which dirt is attached by cooking. With polysiloxane having mica powder, metal oxide-coated mica powder, graphite, talc, plate-shaped iron oxide pigment, scaly metal powder, potassium titanate fiber, or a scaly substance or a fibrous substance alone or Coated with a heat- and stain-resistant coating material whose mixture is an essential component
It was cured by heating.

The methyl polysiloxane having a three-dimensional network molecular structure referred to in the present invention is different from methyl phenyl polysiloxane which is usually used in heat-resistant paint, and a phenyl group is used as an organic group directly bonded to a silicon atom. It does not contain a methyl group, and it is stored in a structure with a hydroxyl group remaining at the end and cured by dehydration condensation in the final application to form a film. Since the methyl group has a much smaller molecular weight than the phenyl group, the methylpolysiloxane has a small loss on heating and forms a dense film with little discoloration after heating and surface deterioration due to heat. Further, preferably, the average number of methyl groups bonded to one silicon atom is reduced to 0.5 to 1.2 to form a hard coating film having a small crosslinking loss and a high crosslinking density and a high thermosetting property. However, the heat crack resistance is not good.
Methylphenylpolysiloxane can be mixed with methylpolysiloxane, but it is preferably 20 wt% or less based on the total polysiloxane in order to reduce stain resistance.

Polysiloxane having a linear molecular structure is
The surface tension is very small compared to general organic oils and solvents,
In addition, since it has low affinity and solubility for many substances, it functions as a release agent. Since it is chemically inert, it has excellent heat resistance and is physiologically nontoxic.
Types of polysiloxane having a linear molecular structure include methyl polysiloxane having only a methyl group as an organic group directly bonded to a silicon atom, methylphenyl polysiloxane having both a methyl group and a phenyl group, a methyl group and a hydrogen atom. Methyl hydrogen polysiloxane having This has the function of improving the stain resistance of the coating, but it is desirable to contain it in the range of 0.1 to 5 wt% in the nonvolatile component of the coating material. If it is contained in a larger amount, the coating tends to be softened by heat and is easily scratched.

Mica powder, metal oxide-coated mica powder, graphite, talc, plate-shaped iron oxide pigment, scaly metal powder, potassium titanate fiber, having a particle size of 1 to 100 μm and a thickness of 0.0.
1 to 10 μm scale-like substance or fiber diameter 0.1 to 5 μm
m or a fibrous substance having a fiber length of 10 to 1000 μm has a function of preventing cracks in the coating film and improving heat crack resistance, and is 5 to 80 w of the non-volatile component of the coating material.
It is preferably used in the range of t%.

Further, a coloring material for coloring for the purpose of aesthetics and an extender can be mixed in the non-volatile component of the coating material in an amount of 0 to 75% by weight. Furthermore, by mixing 0 to 5 wt% of a curing agent or an anti-settling agent as an additive, the coating material can be heat-cured at a low temperature for a short time, and the coating material can be rheologically adjusted.

A gas-table top plate or a soup saucer is provided with a heat-resistant and stain-resistant coating material containing these non-volatile components and alcohols, ketones, aromatic hydrocarbons or other organic solvents as volatile components as a diluent or a mixed solvent as a diluent. , Coated in the microwave oven cooker, preferably 250 ℃
By heating and hardening at a temperature of ~ 450 ° C, the food itself discolors due to heat, and there is no phenomenon that it becomes a stain that cannot be wiped off by the juice, oil, soot, etc. from the food being cooked. Equipment can be provided.

The coating thickness of the heat and stain resistant coating coating material of the present invention is not particularly limited, but a coating thickness of 5 to 100 μm is generally preferable. If the coating thickness is less than this, it is difficult to coat uniformly, and if the coating thickness is more than this, it is not economical and cracks are likely to occur during heating. Regarding the coating of the heat- and stain-resistant stain-resistant coating material, any known method may be used as the method or the method of heat curing.

[0013]

EXAMPLES The present invention will be described in more detail based on examples. FIG. 1 shows a gas table according to the present invention, the structure and operation of which are the same as those described in the conventional art, and the description thereof will be omitted. Further, FIG. 2 shows a general microwave oven, 8 is a body, 9 is a cooking cabinet, and cooked food is cooked in the cooking cabinet 9.

In the present invention, the heat- and stain-resistant coating film coating material is coated on the surfaces of the top plate 3, the juice tray 5 of FIG. 1 and the cooking cabinet 9 of FIG.

The coating material will be described below with reference to the table.

Table 1 shows the comprehensive evaluation results regarding the heat resistance performance of the coating material reducing resin.

[0017]

[Table 1]

Here, the resin (1) is methylphenyl polysiloxane, for example, trade name KR-311 manufactured by Shin-Etsu Chemical Co., Ltd., and the resin (2) is methylphenyl polysiloxane, for example trade name K.
R-282 manufactured by Shin-Etsu Chemical Co., Ltd., resin (3) is methyl polysiloxane, for example, trade name KR-240 Shin-Etsu Chemical Co., Ltd., resin (4) is alkyd-modified silicone resin, for example trade name K.
R-206 manufactured by Shin-Etsu Chemical Co., Ltd., resin (5) is an epoxy-modified silicone resin, for example, ES1001 manufactured by Shin-Etsu Chemical Co., Ltd.,
The resin (6) is an ethylene tetrafluoride resin, the resin (7) is a copolymer of an ethylene tetrafluoride resin and a polyether sulfone resin, and the resin (8) is a bisphenol type epoxy resin. At this time, 50 parts of resin were mixed with 10 parts of mica powder, 38 parts of titanium oxide as a coloring material, and 2 parts of an anti-settling agent. The coating thickness was 30 μm using a spray gun.
The base material used for this evaluation is a standard stainless steel plate (S
US-304) was used. The conditions for heat curing are an electric oven, predrying at 80 ° C, and then 2 at 400 ° C.
Heating for 0 minutes was performed.

Table 2 shows the evaluation results of the heat-resistant crack preventing material of methylpolysiloxane having a three-dimensional network molecular structure.

[0020]

[Table 2]

Here, the heat-resistant crack prevention material (1) is SiC fine powder such as GMF-12H Taiheiyo Random Co., Ltd., the heat-resistant crack prevention material (2) is scaly graphite such as 4A Toa Graphite Smelting Co., and the heat-resistant crack prevention material (3) is Plate-shaped iron oxide pigments such as MIO-2
F Japan Inorganic Chemical Industry Co., Ltd., heat resistant crack prevention material (4) is silica powder such as Silchic T-3 Daito Sangyo Co., heat resistant crack prevention material (5) is metal oxide coated mica powder such as Iriodin
100 Merck, heat-resistant crack prevention material (6) is talc, for example, talc MS Nippon Talc Co., heat-resistant crack prevention material (7) is mica powder, for example, A-1 Yamaguchi Mica Industry Co., Ltd., heat-resistant crack prevention material (8) is Scale-like aluminum powder such as 1100NA manufactured by Toyo Aluminum Co., Ltd., a heat-resistant crack preventive material (9) is potassium titanate fiber such as B type manufactured by Kubota Iron Works Co., Ltd., a heat-resistant crack preventive material (1).
0) is iron oxide such as Rouge No. The heat-resistant crack prevention material (11) manufactured by Morishita Benji Co., Ltd. is white carbon, for example, Cyloid 978 manufactured by Fuji Devison. At this time, 60 parts of the coating raw material resin (3), titanium oxide 18 as a coloring material
Parts, 2 parts of anti-settling agent, and 20 parts of heat-resistant crack preventing material were mixed, and the viscosity was adjusted to 15 seconds with an Iwata cup with a diluent in which toluene and butanol were mixed at a ratio of 1: 1. Other conditions are the same as the evaluation of the coating material resin.

Table 3 shows the evaluation results regarding the stain resistance of the coating.

[0023]

[Table 3]

The surface of the top plate 3, the soup saucer 4 of FIG. 1 or the cooking cabinet 9 of FIG. 2 is coated with the coating material made of the non-volatile components shown in the formulation example, and after heating and curing, cooking is performed for about 200 hours. , And examined the discolored state.

Table 4 shows the results of examining the heat curing conditions of the coating material.

[0026]

[Table 4]

Formula (4) was used as the coating material. The viscosity was adjusted to 15 seconds with an Iwata cup using a diluent in which toluene and butanol were mixed at a ratio of 1: 1 and the coating thickness was applied to 30 μm using a general air spray gun. The base material used for this evaluation is a standard stainless steel plate (SUS
-304) was used. As conditions for heat curing, an electric oven was used for preliminary drying at 80 ° C. and then heat curing at a predetermined temperature.

In the table, double circles indicate extremely good characteristics, ◯ indicates good characteristics, Δ indicates practicable, and x indicates impractical.

As a result of the above evaluation, as the coating material raw material resin, the resin (1) which is excellent in adhesion and discoloration after heat resistance,
Although (2) and (3) were selected, the most preferable one was the resin (3) with less gloss deterioration. Further, what has been effective as a heat-resistant crack preventive material for the resin (3) is a heat-resistant crack preventive material (2), a heat-resistant crack preventive material (3), a heat-resistant crack preventive material (5), a heat-resistant crack preventive which is a scale-like substance. The material (6), the heat-resistant crack preventing material (7), the heat-resistant crack preventing material (8), and the heat-resistant crack preventing material (9) which is a fibrous substance. Furthermore, in the evaluation of the stain resistance of the coating, the best result was obtained with the compound (4),
Also, good results were obtained with the formulations (2) and (5).
The heat curing condition is 150 ° C. for 20 minutes to 550 ° C. 2
It can be used for up to 0 minutes, but when considering stain resistance,
The best range was from 20 minutes at 250 ° C to 20 minutes at 450 ° C.

[0030]

As described above, according to the present invention, methylpolysiloxane having a three-dimensional network molecular structure and polysiloxane having a linear molecular structure, mica powder, metal oxide-coated mica powder, graphite, talc, and plate are used. Cooked cookware with a heat- and stain-resistant coating material containing a scale-like substance or a mixture of scale-like substances or fibrous substances selected from powdery iron oxide pigments, scale-like metal powder and potassium titanate fiber as an essential main component By coating the surface that is contaminated with juice or oil that comes out of it, and heating and curing it, there is no discoloration due to heat, and there is no phenomenon of contamination that cannot be wiped off. An instrument can be provided.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view of a gas table according to the present invention.

FIG. 2 is a perspective view of a microwave oven according to the present invention.

[Explanation of symbols]

 3 Top plate 5 Soup saucer 9 Cookery

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazumasa Okita 1109, Shibaide, Shimochi-machi, Nabari-shi, Mie Prefecture, Okitsumo Co., Ltd. Within the corporation

Claims (2)

[Claims] 1. A cookware for heating a cooked food, such as a gas table or a microwave oven, to prepare methylpolysiloxane having a three-dimensional network molecular structure and a linear molecular structure on the surface to which dirt is attached by the cooking. And a mixture of polysiloxane and mica powder, metal oxide-coated mica powder, graphite, talc, plate-shaped iron oxide pigment, scale-like metal powder, potassium titanate fiber, or a scale-like powder or fibrous powder. A cooking utensil characterized by being coated with a heat- and stain-resistant coating film coating containing, as an essential component, and cured by heating. 2. The heat- and stain-resistant coating material according to claim 1, wherein the methylpolysiloxane having a three-dimensional network molecular structure is 0.1 to 5 wt%, mica powder, metal oxide-coated mica powder, Particle size 1 to 1 selected from graphite, talc, plate-shaped iron oxide pigment, scale-like metal powder, potassium titanate fiber
5 to 80 wt% of a scaly substance having a thickness of 0.01 μm and a thickness of 0.01 to 10 μm, or a fibrous substance having a fiber diameter of 0.1 to 5 μm and a fiber length of 10 to 1000 μm, 5 to 80 wt%, and a coloring material and an extender to 0. 75 wt%, 0 to 5 wt% additive
A cooking utensil characterized by comprising a non-volatile component.