JPH05162777A - Antibacterial container - Google Patents

Abstract

PURPOSE:To obtain an energy-saving, simple, safe and economical antibacterial container to prevent growth of various bacteria in a liquid such as drinking water in the container. CONSTITUTION:The antibacterial container has its inner surface coated with titanium oxide film and, in order to enhance its antibacterial effect, a coat of titanium oxide film is applied to the inner surface of the container which has previously been coated with an electrically conductive film or an additional coat of platinum film is applied to this titanium oxide film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for preventing the growth of bacteria in water.

[0002]

2. Description of the Related Art When drinking water is stored in a container such as a bottle and stored at room temperature for a long period of time, various bacteria propagate.
It rots and cannot drink. To prevent this,
Preservatives are added, or after sterilizing by boiling, etc., sealing is performed (Heibonsha, Encyclopedia,
Vol. 11, p. 473, vol. 9, p. 514). However, the former method is problematic in terms of toxicity and safety, and the latter method is problematic in terms of economy. Further, although it can be stored for a long period of time when stored in a refrigerator, there is a problem in economical efficiency when storing a large amount of drinking water or the like.

[0003]

SUMMARY OF THE INVENTION In view of the above points, the present invention has an object to provide an economical antibacterial container which is energy-saving, can easily and safely prevent the propagation of various bacteria.

[0004]

This object is achieved according to the invention by coating the inside of the container with a titanium oxide film. At this time, in order to improve the bactericidal effect, a titanium oxide film may be coated on a container having a conductive coating inside beforehand, or a platinum film may be further coated thereon. If drinking water or the like is placed in the antibacterial container according to the present invention, it receives light such as sunlight or an electric light, and electrons and holes are generated in the titanium oxide film to carry out redox. It can prevent breeding and can be stored at room temperature for a long time.

The material of the container used in the present invention may be any of concrete, glass, plastic, ceramics, metal, etc., as long as it has the required strength. Further, the material of the container used in the present invention may be transparent or opaque, but the transparent one is convenient because light can pass through the substrate from the outside and enter. In particular, quartz glass, Vycor glass, Pyrex glass, and the like that transmit ultraviolet rays are preferable.

Examples of the conductive film used in the present invention include films of copper, aluminum, etc., but a transparent conductive film such as tin oxide, ITO (indium tin oxide), zinc oxide, etc. which transmits light well. preferable.

The shape of the antibacterial container used in the present invention may be any shape such as a prismatic shape, a cylindrical shape, a spherical shape, a conical shape, a gourd shape, and a rugby ball shape. Further, the substrate may be in a closed shape, may or may not have a lid, and may have a circular tubular shape or a rectangular tubular shape.

The antibacterial container used in the present invention is prepared by making a titania sol from titanium alkoxide obtained by the reaction of titanium tetrachloride and alcohol, and subjecting it to a dip coating method, a spin coating method, a coating method, a spray pyrolysis method or the like. After coating the inside of the container,
It may be manufactured by baking, or it may be manufactured by coating the inside of the container with a suspension of ultrafine particles of titanium oxide by a dip coating method, a spin coating method, a coating method, a spray method, or the like. Good. The firing temperature at that time is most preferably about 500 ° C. Also, a titanium oxide plate made by heating and oxidizing a titanium plate with a gas flame, or an oxidation made by coating with titania sol by dip coating method, spray pyrolysis method, spin coating method, coating method, etc. The titanium film-coated substrate may be assembled and adhered to produce the film.

Examples of the method for coating the conductive film on the container used in the present invention include electrolytic plating method, CVD method, PVD method and sputtering method. Examples of the method of coating the platinum film on the container coated with the titanium oxide film used in the present invention include photoelectric deposition method, CVD method, PVD method, and sputtering method.

If drinking water or the like is placed in the antibacterial container thus obtained, the titanium oxide film receives electrons such as sunlight and light to generate electrons and holes, thereby performing redox.
Due to the action, the propagation of various bacteria can be prevented, and it can be stored at room temperature for a long time.

[0011]

EXAMPLES Among the examples of the present invention, particularly representative ones are shown below.

Example 1 A transparent bottle made of Pyrex glass was coated with a titanium oxide film by a sol-gel method, and then heated at 500 ° C. for 1 hour to prepare an antibacterial container. Then, natural fresh water was added to the mixture, and the mixture was left in a bright place at room temperature for one month.
As a result, when it was contained in a simple Pyrex glass bottle that was not coated with a titanium oxide film, the water became cloudy and miscellaneous bacteria propagated, but when it was contained in an antibacterial container, The water remained transparent and almost no bacteria were detected.

Example 2 A colorless and transparent quartz glass container coated with a titanium oxide film by the sol-gel method was placed in a 2 g / 1 aqueous solution of potassium chloroplatinate in ethanol and stirred with a magnetic stirrer. Meanwhile, the light of a 100 W mercury lamp was irradiated for 4 hours to coat the surface of the titanium oxide film with platinum by photoelectric deposition. This was filled with natural fresh water and left in a bright place for one month. As a result, the water remained transparent and almost no bacteria were detected.

Example 3 A container made of Vycor glass coated with a transparent conductive film of ITO was coated with a titanium oxide film by the sol-gel method, and then 450 ° C.
Then, it was heated for 1 hour and a half to produce an antibacterial container. Then, natural fresh water was added to the mixture, and the mixture was left in a bright place at room temperature for one month. As a result, when it was contained in a bottle made of Vycor glass that was not coated with a titanium oxide film, the water became cloudy and white germs propagated, but when it was contained in an antibacterial container, it was treated with water. Remained transparent and almost no bacteria were detected.

Example 4 A hard glass container provided with a transparent conductive film of ITO was coated with a titanium oxide film by a sol-gel method, and then platinum was coated on the surface of the container to prepare a germ-proof container. Then, natural fresh water was added to the mixture, and the mixture was left in a bright place at room temperature for one month. As a result, when it was placed in a bottle made of hard glass that was not coated with a titanium oxide film, the water became cloudy and miscellaneous bacteria propagated. Remained transparent and almost no bacteria were detected.

[0016]

As described above, the object of the present invention is to provide an economical antibacterial container which is energy-saving, can easily and safely prevent the propagation of various bacteria. The antibacterial container according to the present invention is coated with a titanium oxide film on the inside, and in order to improve the antibacterial effect, a container having a conductive coating on the inside is coated with the titanium oxide film, or further on it. Some are coated with a platinum film. Simply by placing the container in a bright place containing drinking water, etc., the container receives sunlight or light such as electric light, and electrons and holes are generated in the titanium oxide film to carry out redox. By this, the propagation of various bacteria can be prevented. Titanium oxide is a non-toxic, safe and durable substance used in paints, cosmetics, toothpaste, etc., so that drinking water can be safely and economically stored at room temperature for a long time. Moreover, since the titanium oxide film produces beautiful colors such as red, blue, purple, and green due to light interference, the antibacterial container according to the present invention is suitable not only as a container for drinking water but also as a decoration or an object. is there. Furthermore, the antibacterial container according to the present invention can also be used in a fishbowl, a vase, etc.
Water is activated by the redox action of the titanium oxide film, and fish and flowers can live longer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Amada 1-70 Heiwagaoka, Meito-ku, Nagoya City Inoko, No. 4, No. 301, Ishi Housing 4 (72) Inventor Tatsuro Horiuchi 2-109, Yatsushiro-cho, Kita-ku, Nagoya Dormitory 101 (72) Inventor Takahiro Suzuki 3-11 Kitahara-cho, Mizuho-ku, Nagoya City Sanoh Mansion Mizuho Kitahara 102 (72) Inventor Toshihiko Ozaki 91 (72) Inventor Kazumi Kaichi Kato Aichi Kato Machine Co., Ltd. 400, Iwaki, Komaki City, Kumamoto Prefecture (72) Inventor Hiroaki Yokoi 56 Nobata, Yaruge Town, Iwakura City, Aichi Prefecture Aiwa Co., Ltd.

Claims (4)

[Claims] 1. A germ-proof container characterized in that a titanium oxide film is coated on the inside of the container. 2. An antibacterial container characterized in that a conductive film is formed on the inside of the container and a titanium oxide film is further coated on the conductive film. 3. An antibacterial container characterized in that a titanium oxide film is coated on the inside of the container, and a platinum film is further coated on the titanium oxide film. 4. An antibacterial container characterized in that a conductive film is formed on the inside of the container, a titanium oxide film is coated on the conductive film, and a platinum film is further coated on the titanium oxide film.