JPH09194766A - Heat-resistant coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the resistance of delamination on the surface of a coated layer. SOLUTION: A heat resistance coating is prepared by mixing 20.5wt.% of a silicone resin, 11.5wt.% of a black pigment, 1.4wt.% of alumina glass and 1.9wt.% of titanium whisker pigment in a solvent such as thinner. Thus, the delamination resistance of the coating layer surface is improved by entanglement of fibrous pigments, as its performance, for example, high adhesion to the substrate metal and the upper limit of heat resistance over 500 deg.C in >=80μm coating layer thickness are sustained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat resistant paint containing silicon resin as a main component.

[0002]

For example, in a heating cooker, a heat resistant paint is applied to the inner surface of the cooking chamber.
This heat-resistant paint contains silicon resin as a main component, and has heat resistance enough to withstand the condition of "600 ° C x 500 Hr". The components of this heat resistant paint are shown below.

Silicon resin 21.0% Black pigment 15.0% Alumina glass 4.2% Mica 7.7%

However, mica is added to the above heat-resistant paint in order to maintain performance such as a film thickness of 80 μm or more at a heat-resistant temperature of 500 ° C. or more. For this reason, when a cellotape adhesion test (cellotape is a trade name of "Nichiban Co., Ltd.") is performed as a secondary evaluation after conducting a heat resistance test, salt spray test, boiling water resistance test, etc. May occur.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat resistant coating capable of improving the peeling resistance on the surface of a coating film.

[0006]

The heat-resistant paint according to claim 1 is characterized in that it contains a silicone resin, alumina glass, and a fibrous pigment. The heat-resistant paint according to claim 2 has a silicon resin content of about 20.5.
%, The alumina glass content is about 1.4%, and the fibrous pigment content is about 1.9%.

According to the above means, the fibrous pigment was used as a component of the heat resistant paint and the mica was abolished. Therefore, the peel resistance on the surface of the coating film is improved due to the entanglement of the fibrous pigment while maintaining the performance such as the film thickness of 80 μm or more at the heat resistant temperature of 500 ° C. or more.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1, the microwave oven main body 1 has an inner box 3 housed inside an outer box 2, and the inside of the inner box 3 functions as a cooking chamber 4. A planar heater 5 and a tubular heater 6 are provided at the bottom and ceiling of the cooking chamber 4, and when the heaters 5 and 6 generate heat, the inside of the cooking chamber 4 is heated.
The food in the cooking chamber 4 is cooked with a heater.

On the right side of the cooking chamber 4, a machine chamber (not shown) is formed between the outer box 2 and the inner box 3. A magnetron and a waveguide (both not shown) are arranged in the machine room. When the magnetron is energized, microwaves are radiated from the magnetron into the cooking chamber 4 through the waveguide to cook. The food in the room 4 is range cooked.

The outer box 2 and the inner box 3 are made of steel plates, and as shown in FIG. 2, a heat resistant coating film 7 is formed on the inner surface of the inner box 3 at the bottom. The heat-resistant coating film 7 has such a property that the heat-resistant temperature is 500 ° C. or more and the film thickness is 80 μm or more, and is formed by applying the heat-resistant coating material of the following components to the inner box 3.

Silicon resin 20.5% Black pigment 11.5% Alumina glass 1.4% Fibrous pigment 1.9% Incidentally, titanium-based whisker pigment is used as the fibrous pigment of the heat resistant paint. Further, thinner is used as a solvent for the heat resistant paint.

According to the above-mentioned embodiment, the fibrous pigment made of titanium-based whisker pigment was used as a component of the heat resistant paint, and the mica was abolished. Therefore, the peeling resistance on the surface of the coating film 7 is improved due to the entanglement of the fibrous pigment while maintaining good adhesion with the base metal and performance such as a film thickness of 80 μm or more at a heat resistant temperature of 500 ° C. or more. Therefore, even if a cellophane tape adhesion test was conducted as a secondary evaluation after the heat resistance test, salt spray test, boiling water resistance test, etc., peeling did not occur on the surface.

In the above embodiment, the silicon resin content is 20.5% and the alumina glass content is 1.
Although the content of the fibrous pigment is 4% and the content of the fibrous pigment is 1.9%, the content is not limited to this, and the content of the silicone resin is about 2%.
The content of the alumina glass may be 0.5%, the content of the alumina glass may be about 1.4%, and the content of the fibrous pigment may be about 1.9%.

Further, in the above embodiment, the titanium-based whisker pigment has been exemplified as the fibrous pigment, but the present invention is not limited to this.

Further, in the above embodiment, the heat-resistant paint of the present invention was applied to the heat-resistant coating film 7 of the cooking chamber 4, but the present invention is not limited to this, and the point is that the heat-resistant temperature is 500 ° C.
As described above, it may be applied to a coating film that requires performance such as a film thickness of 80 μm or more and peel resistance.

[0016]

As is clear from the above description, the heat-resistant coating material of the present invention uses a fibrous pigment as a component of the heat-resistant coating material and eliminates mica. Therefore, while maintaining good adhesion with the base metal and performance such as a film thickness of 80 μm or more at a heat resistant temperature of 500 ° C. or more, the entanglement of the fibrous pigment improves the peeling resistance on the surface of the coating film.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention (a perspective view of a microwave oven).

FIG. 2 is a sectional view showing a heat-resistant coating film and an inner box.

[Explanation of symbols]

 7 shows a heat resistant coating film.

Claims (2)

[Claims] 1. A heat resistant coating material comprising a silicone resin, alumina glass and a fibrous pigment. 2. The content of silicon resin is about 20.5%,
The heat-resistant paint according to claim 1, wherein the content of alumina glass is about 1.4% and the content of fibrous pigment is about 1.9%.