JPH05293049A - Cooking vessel - Google Patents

Abstract

PURPOSE:To maintain water repellency and cleanability in a long period of time, by a method wherein a water repellent coating film made by blending a fluoroalkylsiloxane compound of wt.% of a particular range based on a polyfluorovinylidene resin of 100wt.% is formed on the inner surface of a vessel. CONSTITUTION:A water repellent coating film obtained from a mixture, which has at least a polyfluorovinylidene resin and a fluoroalkylsiloxane compound and is made by blending the later of 0.1wt.% to 15wt.% based on the former of 100wt.%, is formed on the inner surface of a water-holding vessel 2. Under the conditions that electricity is supplied thereto through a power cord 8 and the vessel is isolated with a lid 3 from the outside, water in the water-holding vessel 2 is heated and after it is boiled, it is always kept at 95 deg.C or higher. Therefore, since the inner surface is held under the conditions that hot water 5 is always in contact with the water repellent paint film, the depositions of components solved in the hot water 5 adhere to the surface part of the coating film, as dart and are heaped up. Since a layer with water repellency is exposed by the operation of wiping the coating film, the water repellency and cleanability on the surface can be maintained in a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a container having a coating film having long-term water repellency, cleanability and boiling water resistance, which is formed by coating the surface of a substrate and baking at a relatively low temperature. The present invention relates to a cooker formed on the inner surface.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for a coating film that can be easily wiped off even if dirt adheres to the inner surface of a cooker container and can maintain repellency and water repellency for a long period of time. There is. For this purpose, a fluorine coating film is generally used.

[0003]

Among the conventional fluorine-coated films, polytetrafluoroethylene resins have poor adhesion to the substrate, and therefore, in order to maintain a strong coating film for a long period of time, Fluorine resin paint for top coat is applied after the surface is roughened extremely by physical methods such as blasting or by erosion etching by chemicals, then quickly coated with fluororesin primer, dried and then overlaid. Was applied and then baked at a high temperature of 380 ° C. Therefore, in order to form a coating film, a high level of technology such as roughening the surface of the base material and baking at high temperature is required, and it is difficult to cope with the general coating form. Furthermore, the state of the coated fluorine-coated film cannot be utilized by taking advantage of the surface state of the base material and the color feeling due to the addition of the modified pigment and the like.

On the other hand, the polyfluorovinylidene-based resin of the fluorine-coated film was able to be baked at a relatively low temperature and was transparent, but was poor in cleanability, water repellency and adhesion to the substrate.

The present invention solves these problems, and by forming a coating film by one-time application and baking at a relatively low temperature, it is possible to deal with a general form of coating. A first object of the present invention is to provide a cooker having a coating film which can maintain water repellency and cleanliness over a long period of time and is also transparent on the inner surface of a container.

A second object of the present invention is to provide a cooking device having a coating film having boiling water resistance on the inner surface of the container by improving the adhesion to the base material.

[0007] In both of these, there is no deterioration of the coating film for a long period of time, and a cooker equipped with a container capable of easily releasing the deposits such as water stains and cooked foods and maintaining water repellency for the purpose of rust prevention. Can be provided.

[0008]

Means for Solving the Problems To achieve the first object, the first means of the present invention comprises at least a polyfluorovinylidene resin and a fluoroalkylsiloxane compound, and 0.1 wt% to 1 of the fluoroalkylsiloxane compound with respect to the resin
Provided is a cooker in which a water-repellent coating film obtained by adding a mixture of 5% by weight is formed on the inner surface of a container.

Second aspect of the present invention for achieving the second object
In the cooking device, the water-repellent coating film obtained by the mixture obtained by adding 0.1% to 50% by weight of the acrylic resin to the mixture of the first means is formed on the inner surface of the container. provide.

[0010]

According to the above first means, the composition can be easily applied to the surface of the base material degreased by the usual method,
By baking at a relatively low temperature of 130 ° C to 240 ° C, the fluoroalkyl siloxane compound having a relatively low molecular weight in the two components moves to the surface layer portion during the heating step and topologically reacts with the polyfluorovinylidene resin. A coating film in which the polyfluorovinylidene resin is entangled and fixed to improve the water repellency and cleanliness of the polyfluorovinylidene resin is obtained.

This state is different from the state in which the fluoroalkylsiloxane compound is simply attached to the surface of the coating film, and is the coating film component in the state in which the fluoroalkylsiloxane compound is distributed in the surface layer portion. For this reason, when the surface temperature of the coating film becomes high, even if the cleanliness decreases due to the decrease in the surface hardness of the polyfluorovinylidene resin, the fluoroalkyl siloxane compound attached to the surface decreases the cleanliness. compensate. Even if the fluoroalkylsiloxane compound attached to the surface disappears, a new water-repellent layer containing the fluoroalkylsiloxane compound is exposed by performing operations such as washing, rubbing, and wiping the coating film, Even if the surface layer portion in which the fluoroalkylsiloxane compound is distributed disappears, the water repellency of the polyfluorovinylidene resin itself is long-term water repellency,
Maintains cleanliness and metal rust prevention. As described above, since it is possible to secure sufficient adhesion and uniformity of the coating film by the ordinary degreasing treatment without rigorously pretreating the substrate unlike the conventional fluorine coating, it is extremely easy to form the coating film. is there.

The effect is that even if the mixing amount of the fluoroalkylsiloxane compound is increased more than necessary, the above-mentioned effect of the surface portion is constant, while the mixed composition and the cured coating film become cloudy, and Since a repellency phenomenon is developed on the surface of the base material during coating on the material, the uniformity of the coating film and the adhesion to the base material are deteriorated.

As described above, since it is possible to secure sufficient adhesion and uniformity of the coating film by the usual degreasing treatment without performing the pretreatment of the base material strictly like the conventional fluorine coating, it is possible to form the coating film extremely. It's easy.

According to the second means, the acrylic resin is topologically entangled with the polyfluorovinylidene resin or the fluoroalkylsiloxane compound to improve the adhesion of the polyfluorovinylidene resin to the substrate. Thus, a water-repellent coating film having boiling water resistance can be obtained.

In order to achieve the above object, the water-repellent coating film of the present invention is formed on the inner surface of a stainless (SUS430) container to form a water container. Since the firing temperature for is relatively low at 130 ° C. or higher, the formation of an oxide film on stainless steel does not occur. For this reason, the color feeling of the substrate can be utilized as it is through the coating film, so that the beautiful feeling for filling the drinking water (food) is not impaired. Further, it can be easily washed against adhesion of scales and the like to the base wall due to repeated boiling of water, and the washing can restore the above-mentioned water repellency, so that it can be maintained for a long time.

For the above purpose, when the water-repellent coating film of the present invention is formed on the inner surface of the container and attached to the main body to form a cooker, even if stickiness of the cooked product occurs, the mold can be easily released. The above effects can be achieved by simple washing, so that beauty and cleanliness can be maintained for a long period of time.

[0017]

【Example】

(Example 1) A jar pot will be described below as an example of the cooking device of the present invention. In FIG. 1, reference numeral 1 is a main body of a jar pot, 2 is a hot water holding container made of this base material, which is attached to the main body 1, and the upper portion thereof is covered with a lid 3 which can be opened and closed by a hinge 4. Reference numeral 5 denotes hot water stored in the hot water holding container 2. 6 is a pump knob for discharging hot water 5, and 7 is a hot water discharge port. Reference numeral 8 is a power cord for supplying power to the main body 1. The hot water holding container 2 is formed as follows.

Heptadecafluorodecatritrimethoxysilane was mixed as a fluoroalkylsiloxane compound so that the total amount was 100% by weight with respect to the polyfluorovinylidene resin, and diluted with a solvent to a solid content of 75% by weight.
It was a coating film forming composition. This composition is applied to the surface of a stainless steel (SUS430) substrate that has been degreased with an ordinary degreasing agent so that the thickness of the coating film after firing is 15 ± 5 μm, and the product is fired at 200 ° C. for 60 minutes, and is colorless and transparent. Was formed.

Next, the operation will be described. The water in the hot water holding container 2 is heated and boiled in a state where power is supplied from the power cord 8 and the outside is shut off by the lid 3, and then the temperature is constantly maintained at a temperature of 95 ° C. or higher. Therefore, since the hot water 5 is always kept in contact with the water-repellent coating film shown above, the deposits of the components dissolved in the hot water 5 on the surface of the coating film adhere and accumulate as dirt. The hot water 5 kept warm is discharged by the operation of the pump knob 6 as necessary. When there is no hot water 5, pour fresh water to bring it to a boil. The jar pot is used in a state where this operation is repeated.

In order to test the water repellency of this coating film, 10 μl of water was dropped on the inner wall surface of the hot water holding container 2 and the contact angle of this water drop was measured. The results are shown in (Table 1).

[0021]

[Table 1]

As is clear from these results, the upper limit of the mixing of heptadecafluorodecatyltrimethoxysilane is 15% by weight from the state of the coating film. Furthermore, the lower limit of the mixing of heptadecafluorodecatyltrimethoxysilane that can maintain a constant contact angle is 0.1% by weight, and the object of the present invention can be achieved within this range.

As the fluoroalkylsiloxane compound which can achieve the object of the present invention, compounds generically referred to as trioxyfluorosiloxane and trichlorofluorosiloxane are effective.

When the composition is applied to the substrate, it may be diluted with an alcohol, a chlorine-based solvent, a ketone-based solvent, or an aromatic hydrocarbon-based solvent. It is made with rollers. As the base material, a base material such as metal, glass, and plastics can be used as long as it can withstand the baking at the time of forming the coating film, and the performance shown above can be obtained. The base material to be applied may be plate-shaped.

(Example 2) Heptadecafluorodecatritrimethoxysilane was added to the above-mentioned polyfluorovinylidene resin as a fluoroalkylsiloxane compound.
The polymethylmethacrylate resin was mixed as an acrylic resin so that the total amount would be 100% by weight with respect to the mixture added by% by weight, and diluted with a solvent to a solid content of 75% by weight to obtain a coating film-forming composition. The stainless steel (SUS
430) A coating film was formed on the surface of the base material. The hot water holding container 2 of the jar pot shown in FIG.

In order to test the performance of this water-repellent coating film in practical use, water is put in the hot water holding container 2 and the hot water is boiled.
Hold for 0 minutes, drain hot water, and pour water
Repeated 000 times. 2.5 every 100 times during this time
After washing by boiling with a wt% citric acid aqueous solution to wash stains on the water-repellent coating film, the contact angle of water was measured by the same method as in Example 1, and the surface condition of the coating film was observed. It is shown in Table 2).

[0027]

[Table 2]

As is clear from this result, the lower limit of mixing of the acrylic resin is 1% by weight from the peeling rate. Furthermore, the lower limit of the mixing of the acrylic resin that can maintain the contact angle at a constant value is 50% by weight, and the object of the present invention can be achieved within this range.

In this embodiment, the same effect can be obtained by using an epoxy resin instead of the acrylic resin.

Further, in each of the embodiments, an example of a jar pot was described as a cooking device, but this effect can also be exerted on various cooking devices.

[0031]

As is apparent from the above embodiments, the first
According to the invention, the mixture of the present invention can be easily applied to the surface of the base material degreased by the usual method, and by firing at a relatively low temperature of 130 ° C. or higher, the mixture of the two components The relatively low molecular weight fluoroalkyl siloxane compound moved to the surface layer and was topologically entangled and fixed with the polyfluorovinylidene resin, further improving the water repellency and cleanability of the polyfluorovinylidene resin. A coating film is obtained. Even if the water repellency is lost, the layer having water repellency is exposed by performing an operation such as wiping the coating film, so that the water repellency and cleanliness can be maintained for a long time.

According to the second invention, the acrylic resin is topologically entangled with the polyfluorovinylidene resin or the fluoroalkylsiloxane compound to improve the adhesion of the polyfluorovinylidene resin to the substrate. A water-repellent coating film having a boiling water resistance over a long period of time can be obtained.

Further, according to the present invention, when the cooker is equipped with the container having the water-repellent coating film formed on the inner surface thereof, there is no change in water repellency, cleanability, and rust resistance for long-term practical use. This effect is great because the color appearance of the substrate can be utilized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a jar pot which is an embodiment of the present invention.

[Explanation of symbols]

 1 Main body 2 Hot water holding container 3 Lid 4 Hinge 5 Hot water 6 Pump knob 7 Hot water outlet

Claims (2)

[Claims] 1. A polyfluorovinylidene resin and a fluoroalkyl siloxane compound are contained at least, and 0.1 wt% to 15 wt% of the fluoroalkyl siloxane compound is added to the polyfluorovinylidene resin. A cooking device in which a water-repellent coating film obtained from a mixture is formed on the inner surface of a container. 2. A cooking device comprising a container and a water-repellent coating film formed on the inner surface of the container, the water-repellent coating film being obtained by adding the acrylic resin to the mixture according to claim 1 in an amount of 0.1% by weight to 50% by weight.