JPH0741003B2 - Heating cooker - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating cooker such as a hot plate and a frying pan, and more particularly to a fluororesin coating layer on a cooking surface.

2. Description of the Related Art Conventionally, fluorine-based resins such as tetrafluoroethylene and tetrafluoroethylene-hexafluoropropylene copolymer have been used on the cooking surface of heating cookers such as hot plates. Since this fluorine-based resin has high non-adhesiveness, chemical resistance and heat resistance, it has a great feature that the cooked material and the cooking surface are easily released from each other during heating and is easy to clean. , Has rapidly spread.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, since the fluorine-based resin has a low hardness, it is easily scratched by a metal spatula and the like, and there is a problem for applications requiring wear resistance such as a hot plate. There are several ways to do this.

As one of them, the surface of the aluminum alloy is roughened by blasting, the surface is melt-coated with ceramic particles by a method such as plasma spraying to harden the surface of the aluminum alloy, and then a fluorine-based resin is applied through a primer layer. Or a method of roughening the surface of the aluminum alloy by etching, hardening this surface by anodizing, and coating this surface with a fluorine-based resin. According to these methods, even if the fluorine-based resin is scratched by a metal spatula, it is difficult to reach the aluminum alloy cloth, so the corrosion resistance is improved as compared with that without the hardening treatment, but the hardness of the fluorine-based resin is Since it is not high, the cooking surface is damaged and becomes very messy, and the adhesiveness and corrosion resistance decrease.

Another method to increase the hardness of the fluororesin is to add titanium coating mica to the fluororesin, but this is added from a decorative point of view, and the coating hardness is improved. Is insignificant.

The present invention solves the above-mentioned problems of the prior art. With respect to the fluorine-based resin coating film that has been conventionally easily scratched by a metal spatula, the adhesiveness, the coloring property, the film-forming property, the smoothness of the coating surface,
Without impairing various properties such as dispersibility of fluorine resin paint,
The purpose of the invention is to improve the film hardness and to improve the scratch resistance, abrasion resistance and corrosion resistance, which have been problems in the past.

Means for Solving the Problems In order to solve the above problems, the present invention provides a cooking container made of aluminum or an alloy thereof, a sprayed layer provided on the upper surface of the cooking container, and a primer layer provided on the upper surface of the sprayed layer. When,
A fluorine-based resin coating layer containing reduced potassium hexatitanate whiskers (K ₂ O · 6TiO _x ) was formed on the upper surface of the primer layer.

Action When a fluorine-based resin coating layer containing K ₂ O ・ 6TiO _x is formed on the cooking surface of a cooking vessel made of aluminum or its alloy, the hardness of the fluorine-based resin coating layer is reduced _by the action of K ₂ O ・ 6TiO _x. Greatly improves.

K ₂ O · 6TiO _x is potassium hexatitanate whisker (hereinafter,
K ₂ O ・ 6TiO ₂ ) is used in an atmosphere containing a reducing gas such as propane, butane, city gas, etc.
It is manufactured by applying reduction treatment at a temperature of ℃. Also K ₂ O ・ 6Ti
O ₂ has an average fiber length of 10 to 20 μm and a fiber diameter of 0.2 to 0.5 μm.
In this case, the fibers are entangled with each other and have a cotton-like appearance. If this is added to a fluorine-based paint, the dispersibility will be poor, such as the occurrence of agglomeration of fibers partially, which is a problem.

In addition, since the hue is white, the coating formed on the cooking surface of the cooking container becomes white, and when it is repeatedly cooked, such as grilled meat, it is partially colored dark and stains are very noticeable. There is.

When K ₂ O · 6TiO ₂ is reduced, it becomes K ₂ O · 6TiO _x , and the degree of oxidation decreases as the reduction proceeds.

The hue of K ₂ O ・ 6TiO _x is dark blue when the value of x is 1.75 to 1.80,
1.65 to 1.75 bluish black, 1.50 to 1.65 dark purple, 1.33 to
It is dark brown between 1.45 and light brown at 1.25 and is colored. Therefore, even if it is added to the fluorine-based paint, it does not turn white. In addition, since long fibers are broken and shortened during the reduction process, the entanglement of the fibers is significantly reduced. As a result, when it is added to a fluorine-based paint, it is uniformly dispersed, so that the coating surface has smoothness, abrasion resistance, scratch resistance, and
Coloring and corrosion resistance are greatly improved.

Example Hereinafter, one example of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an enlarged cross-sectional view of a cooking surface of a hot plate showing an embodiment of a heating cooker of the present invention. Reference numeral 1 is a cooking container made of aluminum or its alloy, and a sprayed layer 2 of ceramic particles is formed on the surface thereof. After that, the fluorine-based resin coating layer 4 containing K ₂ O · 6TiO _x is provided via the primer layer 3.

Although the cooking vessel 1 is made of aluminum or its alloy, in the embodiment of the present invention, an experiment was performed by using aluminum die casting (ADC-10).

Next, the manufacturing procedure of the heating cooker of the present invention will be described. First, based on the design, the cooking container 1 is formed by die casting, and the cooking surface is ground with a plast material to form irregularities, and then the ceramic sprayed material. Is sprayed onto the ground surface by a plasma spraying device, and the die cast surface on which the sprayed layer 2 is formed is cured by the drawing effect. Primer layer 3 on this surface
Through, apply a fluorine-based resin paint containing K ₂ O.6TiO _x ,
It is dried and baked to form the fluorine-based resin coating layer 4.

The fluorine-based resin coating layer 4 contains PTFE and PFA alone or a mixture as a main organism, and contains at least K ₂ O.6TiO _x .

Next, an example of the fluorine-based resin coating layer 4 will be described.
Based on the dispersion of PTFE, K ₂ O · 6TiO _x is added together with a dispersant, a film-forming agent, a crack preventing agent, etc. to prepare an aqueous dispersion of PTFE. The addition amount of K ₂ O.6iO _x can be added up to 50 wt% with respect to the solid content, but preferably it should be limited to 1 to 30 wt%. If the amount of K ₂ O · 6TiO _x added exceeds 30 wt%, the hardness of the fluorine-based resin coating layer 4 will be high, but the adherence will be poor and the surface smoothness will be low. If it is less than 1 wt%, the effect of addition is small. In the embodiment, it is set to 10 wt%.

Moreover, although the value of x of K ₂ O · 6TiO _x in the range of 1.25 to 1.80 can be applied to the present invention, those in the range of 1.65 to 1.75 were used in the examples. Adjusted as above
An aqueous dispersion of PTFE was applied on the surface of the thermal sprayed layer 2 through the primer layer 3 so as to have a thickness of 20 μm, dried at 120 ° C. for 10 minutes, baked at 380 ° C. for 10 minutes, and then water-cooled at 330 ° C. A sample of the present invention was created.

The evaluation was carried out by comparison with a sample containing no K ₂ O · 6TiO _x (conventional example). The hardness (pencil hardness) was F in the conventional example, while 3H in the example of the present invention. Became. Also,
Regarding the tackiness, the result of the grilled meat test showed no difference from the conventional example. The surface smoothness was better than that of the conventional example. The evaluation of corrosion resistance was slightly better than that of the conventional example. Furthermore, the scratch resistance was also better than before. The colorability was not different from the conventional example.

Effects of the Invention According to the present invention, as is clear from the description of the above embodiments,
K ₂ O is added to the fluorine resin coating layer formed on the cooking surface of the cooking container.
・ Since 6TiO _x is added, it is possible to obtain a heating cooker excellent in wear resistance, scratch resistance, corrosion resistance, surface smoothness, and colorability. Also, since the thermal sprayed layer is provided on the upper surface of the base material, there are many irregularities on the surface of the upper layer coating, but even if the surface is rubbed with a spatula, etc., it will be gradually scraped from the convex portion of the upper layer coating. The coating is never scraped off at once.

[Brief description of drawings]

The drawing is an enlarged sectional view of the cooking surface of a hot plate showing an embodiment of the heating cooker of the present invention. 1 ... Cooking container, 2 ... Thermal spray layer, 4 ... Fluorine resin coating layer.

Claims (3)

[Claims] 1. A cooking vessel made of aluminum or its alloy, a sprayed layer provided on the upper surface of the cooking vessel, a primer layer provided on the upper surface of the thermal spraying layer, and reduced hexatitanium provided on the upper surface of the primer layer. Potassium acid whiskers (K ₂ O ・ 6
A heating cooker having a fluorine resin coating layer containing TiO _x ). _{2. The} cooker according to claim 1, wherein _{x of the} reduced potassium hexatitanate whiskers (K ₂ O.6TiO _x ) is in the range of 1.25 to 1.80. 3. The heating cooker according to claim 1 or 2, wherein K ₂ O · 6TiO _x contained in the fluorine resin coating layer is 1 to 30% by weight.