JP2003285388A - Antibacterial film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antibacterial film which can obtain a high antibacterial effect even when the amount of a treatment liquid is little, is low in running cost, and almost exerts no effect on environment. <P>SOLUTION: An organic or inorganic base material can be used for producing the antibacterial film. In the surface properties of the base material, surface roughness Ra is must be set to 10 μm-2 mm. When Ra is below 10 μm, the efficiency of contact of pathogenic bacteria existing in a liquid with an antibacterial agent existing on the surface of the film is lowered and a good antibacterial effect can not be obtained. When Ra is 2 μm or more, the flow of the liquid itself is made non-uniform to lower the antibacterial effect. The pitch of roughness is desired to be 100 μm-10 mm. When the pitch of roughness is below 100 μm, the flow of the liquid is made nonuniform, and when the pitch is 10 mm or more, the contact efficiency can hardly be improved. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial film having an antibacterial action against disease bacteria present in a liquid.

[0002]

2. Description of the Related Art In order to obtain an antibacterial effect against disease-causing bacteria present in a liquid, it is common to add an organic antibacterial agent or an inorganic antibacterial agent to the liquid. In the case of adding an organic antibacterial agent or an inorganic antibacterial agent to a liquid, the form may be a solution, or the antibacterial agent may be dispersed in a solvent to be used as a dispersion, or may be added in a powder state . In this case, the organic antibacterial agent becomes a molecular state and adheres to the disease bacteria in the liquid. Further, the inorganic antibacterial agent becomes a fine powder state or an ionic state to act on disease-causing bacteria, and an antibacterial effect is obtained. In addition, there is also a system in which an organic antibacterial agent or an inorganic antibacterial agent is placed in a liquid as an antibacterial filter instead of being put directly into the liquid and the growth of disease bacteria in the liquid is suppressed by contacting the filter. .

[0003]

However, when the antibacterial agent is directly sprayed / added into the liquid as described above, the effect is positively exerted against disease-causing bacteria, but the property of the liquid itself is changed, Fine powder and dissolved ions may have an adverse effect on the environment. Further, according to this method, the antibacterial effect immediately after addition is high, but the sustainability of the effect can hardly be expected. Therefore, in order to maintain the antibacterial effect for a long period of time, it is necessary to continuously add the antibacterial agent, which increases the running cost.

The method of using the antibacterial filter is
It is effective for the environment and running cost,
It is not effective when it is difficult to pass the antibacterial filter with a small amount of liquid such as a very small amount of liquid to be treated or the liquid exists only on the surface of the container (liquid passage). The present invention has been made to solve the above-mentioned problems, and it is possible to provide an antibacterial film that can obtain a high antibacterial effect even with a small amount of treatment liquid, has a low running cost, and has almost no effect on the environment. To aim.

[0005]

In order to achieve the above object, the antibacterial film according to claim 1 is formed on a substrate by an inorganic antibacterial agent using an antibacterial metal such as silver or copper. Characterize.

The antibacterial film according to claim 2 is characterized in that an inorganic antibacterial agent utilizing an antibacterial metal such as silver or copper is dispersed to form a base material.

Further, the antibacterial film according to claim 3 has the surface roughness of 10 μm or more and 2 mm or less in terms of center line average roughness (Ra) in the structure according to claim 1 or 2. Characterize.

The antibacterial film according to claim 4 has a roughness pitch of 100 in the structure according to claim 1 or 2.
It is characterized in that it is not less than μm and not more than 10 mm.

[0009]

The above antibacterial film can be used in a form in which an antibacterial metal such as silver or copper is carried on an inorganic material powder such as porous ceramics. There are various supporting methods, but those carried out by a method that does not elute in the liquid are desirable, and the ion exchange method is usually used. The generated antibacterial film should ideally be an inorganic antibacterial agent itself, but in view of adhesion to the substrate of the film, film strength and film cost, an inorganic antibacterial agent should be applied to the surface of the film. A sufficient effect can be obtained even with the dispersed antibacterial film.

The amount of the inorganic antibacterial agent used to form the antibacterial film is greatly influenced by the quantity and type of disease bacteria in the liquid to be subjected to antibacterial treatment, the environment in which the liquid is present, etc. Therefore, it is important to know the necessary and sufficient amount in advance by a table test. The base material for forming the antibacterial film may be organic or inorganic.

The surface texture is required to have a surface roughness of 10 μm or more and 2 mm or less in terms of center line average roughness (hereinafter referred to as Ra). When Ra is less than 10 μm, the contact efficiency between the disease-causing bacteria present in the liquid and the antibacterial agent present on the membrane surface is lowered, and a good antibacterial effect cannot be obtained. Further, when Ra is 2 μm or more, the flow of the liquid itself becomes nonuniform, which also reduces the antibacterial effect.

The roughness pitch is 100 μm or more and 10 m
It is preferably m or less. Roughness pitch is 100 μm
If it is less than this, the flow of the liquid becomes nonuniform, and if the roughness pitch is 10 mm or more, improvement in contact efficiency cannot be expected. Here, the roughness pitch means a distance between adjacent convex portions or concave portions of the irregularities on the film surface (the same applies hereinafter).

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION (Example 1) The inner surface of a ceramics container made mainly of aluminum oxide was blasted to have Ra of 50 μm and a roughness pitch of 200 μm. A slurry of the crystallized glass silver antibacterial agent was adhered to the surface and kept at 750 ° C. for 1 hour to obtain an inorganic antibacterial film of Example 1.

Example 2 An organic adhesive (epoxy type) in which an inorganic silver antibacterial agent is dispersed is applied to the inner surface of a ceramics container which has been subjected to the same surface blasting treatment as in Example 2 above. An inorganic antibacterial film of was obtained.

Comparative Example 1 The same antibacterial film treatment as in Example 2 was carried out on the surface of an untreated ceramic substrate (Ra 5 μm, roughness pitch 10 μm) to obtain Comparative Example 1.

Comparative Example 2 Ra: 5 mm, roughness pitch: 50 mm by machining the inner surface of a ceramics container
After that, the surface was subjected to the same antibacterial film treatment as in Example 2 to obtain Comparative Example 2.

The antiseptic membrane-coated ceramic containers obtained in the above Examples and Comparative Examples were dipped in a zoospore control solution of P. helicoididae known as root rot fungus of plants at a depth of 10 mm, The antibacterial effect was confirmed. The results are shown in Table 1.

[0018]

[Table 1]

As a result of the above, according to the product of the present invention, it is possible to obtain a stable antibacterial effect even with a small amount of the treatment liquid or with a liquid having little movement.

[0020]

EFFECT OF THE INVENTION According to the antibacterial film of the present invention, the antibacterial effect can be effectively exhibited against disease-causing bacteria in the aqueous solution remaining in the tray or the pipe.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoshi Kameshima             3-76 Isshiki-cho, Mizunami-shi, Gifu Southway             Room 6 of B6 Building (72) Inventor Hideki Watanabe             236 Inari, Hozumi-cho, Motosu-gun, Gifu Inari Prefecture             Staff Apartment No.405 (72) Inventor Yoshihiro Taguchi             784-117 Uchikoshi, Gifu City, Gifu Prefecture F term (reference) 4D075 BB03X CA34 CA45 CB33                       DA06 DB14 DC05 EA10 EB05                       EB33 EC01 EC60                 4F100 AA01A AA19 AB17A AB24A                       AD00 AK53G AT00B BA02                       BA07 JC00A JK14A                 4H011 AA01 AA02 AA03 BA01 BB18                       BC18 DA07 DA10

Claims (4)

[Claims] 1. An antibacterial film formed on a substrate with an inorganic antibacterial agent using an antibacterial metal such as silver or copper. 2. An antibacterial film formed by dispersing an inorganic antibacterial agent using an antibacterial metal such as silver or copper on a substrate. 3. The surface roughness is 1 at the center line average roughness (Ra).
2. The thickness is 0 μm or more and 2 mm or less.
Alternatively, the antibacterial film according to claim 2. 4. The antibacterial film according to claim 1, which has a roughness pitch of 100 μm or more and 10 mm or less.