JPH1029906A - Part material having antimicrobial action - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart an antimicrobial action to the members for fluidizing a liquid as well as mechanical strength, corrosion resistance and persistency of the antimicrobial action. SOLUTION: A plate base material made of a foamed polyurethane resin is metallized with silver (Ag) on its one surface to form Ag thin layer on the pored wall faces distributing on one surface of the polyurethane resin. In addition, this plate base material is metallized with Ag on the other face whereby an Ag thin layer is formed on the wall faces of the pores distributing on the other face of the foamed polyurethane resin plate, too.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for a member having an antibacterial action for suppressing the growth of bacteria that affect the human body, such as Escherichia coli and Legionella.

[0002]

2. Description of the Related Art In recent years, members having an antibacterial action have been used as members of daily necessities and daily necessities, and various proposals have been made (for example, Japanese Patent Application Laid-Open No. Hei 8-9938).
No. 3).

[0003] On the other hand, a portion where a fluid passes and is in contact with an air filter such as an air filter of an air conditioner and a filter bed of a cooling tower is in an environment where bacteria such as Escherichia coli easily propagate. It is necessary to maintain a sanitary control so that these fluids do not contain these bacteria, and antibacterial members that can be used in such areas where fluids pass and contact are expected. ing.

[0004]

In the case of a member such as an air filter or a filter bed, which is used for a portion through which a fluid passes and comes into contact, the member is in contact with a flowing fluid, so that it can withstand a flowing pressure. It is necessary to have strength,
In addition, it is necessary to have corrosion resistance to the fluid that comes into contact, and in the case of a member having an antibacterial action, it is necessary that the antibacterial action is maintained, but a member having these physical properties is required. There was a problem that was not yet proposed.

[0005]

In order to solve the above-mentioned problems, in the member having an antibacterial effect of the present invention, aluminum, nickel, chromium is formed on the wall surface of a hole present on the surface of a plate-shaped porous support. , Copper, and silver are to be formed.

[0006] The fluid flows into the porous support from one surface, flows through the pores of the support while being in contact with the metal layer formed on the wall surface of the hole, and then forms on the wall surface of the hole from the other surface. It flows out while contacting the metal layer. Therefore,
Since the fluid flows through a member having an antibacterial action on at least the inflow surface and the outflow surface, the growth of bacteria in the pores through which the fluid flows is suppressed, and the outflow fluid contains bacteria. It can be sanitary management without being done.

[0007] The theoretical elucidation that the above-mentioned metal has excellent antibacterial action is unknown, and the metal layer may be formed on the entire wall surface of the pore. The effect can be sufficiently expected by forming the hole on the wall surface of the hole existing on the surface portion of.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a layer containing at least one metal selected from the group consisting of aluminum, nickel, chromium, copper and silver is formed on the hole wall surface existing on the surface of a plate-shaped porous support. It was done.

Further, a layer containing one metal selected from the group consisting of aluminum, nickel, chromium, copper, and silver is formed on the wall surface of the hole present on one surface of the plate-shaped porous support, and the other is formed. It is effective to form a layer containing two kinds of metals selected from the group consisting of aluminum, nickel, chromium, copper and silver on the pore wall surface existing on the surface. Composed of a mixture of different metals, or with aluminum, nickel,
It is possible to form a laminate containing a metal selected from the group consisting of chrome, copper and silver.

Further, the plate-shaped porous support is preferably formed of either a sponge-like foamable polyurethane resin or a nonwoven fabric.

The plate-shaped porous support such as a foamable polyurethane resin or a nonwoven fabric has a mechanical strength capable of withstanding the flow pressure of a fluid, has corrosion resistance to water, air, and the like. Since the metal layer can be firmly held on the hole wall surface, the antibacterial effect is formed on the hole wall surface where fluid flows and contacts by forming a metal layer with antibacterial effect on the hole wall surface, and the propagation of bacteria is suppressed. Thus, the outflowing fluid does not contain bacteria such as Escherichia coli, and can be maintained and managed hygienically.

Hereinafter, embodiments of the present invention will be specifically described.

[0013]

EXAMPLES Examples of the present invention will be described in detail for the case of antibacterial activity of Escherichia coli and Legionella.

(Example 1) Silver (Ag) is vacuum-deposited on both surfaces of a plate-shaped support made of a foamable polyurethane resin, and an Ag thin film is formed on a porous wall surface existing on the surface of the foamable polyurethane resin. This constitutes a member having an antibacterial action.

[0015] The member thus constructed (embodiment).
Was immersed in a bacterial solution of Escherichia coli and Legionella bacteria, and the number of viable bacteria per ml of the bacterial solution was measured over time by the test method described below. The results are shown in Table 1, and the results are shown in Table 1. It can be understood that the member has excellent antibacterial properties. In addition, the comparative example is a test result in the case of using only a bacterial solution without using a member having an antibacterial action.

The test method will be described below. As Escherichia coli strains, Escherichia coli
Using IFO 3301, as a strain of Legionella bacteria, Legionella pneumophila was used.
GIFU 9134 was used.

The bacterial solution of Escherichia coli is cultured in a normal agar medium [Eiken Chemical Co., Ltd.] at 35 ° C. for 18 to 24 hours, and then the cells are suspended in a sterilized phosphate buffer. The solution was prepared to be 10 ⁵ / ml, and the bacterial solution of the Legionella bacterium was prepared by culturing the strain on a BCYEα agar medium (Oxoid).
After culturing at 35 ° C. for 3 days, the cells were suspended in a sterilized phosphate buffer solution to prepare a cell count of about 10 ⁵ / ml.

The culture medium and culture conditions for counting the number of bacteria are as follows. For Escherichia coli, use an ordinary agar medium (Eiken Chemical Co., Ltd.) at 35 ° C. for 2 days. For Legionella, BCYEα is used. Using an agar medium at 35 ° C. for 5 days.

The members having an antibacterial effect used in the test are 9
After being immersed in a 9.5% (V / V) ethanol solution, it was air-dried and pre-treated, and used as an example.

In the test operation, the members were immersed in 500 ml of a bacterial solution, stored at 25 ° C., and the number of viable bacteria in the bacterial solution after 24 hours, 48 hours, and 72 hours was determined. By the pour plate culture method using the measurement medium,
In the case of Legionella bacteria, each was measured by a plate smear culture method using a medium for measuring the number of bacteria. In the case of the comparative example, 500 ml of the bacterial solution was used as it was.

In this test, the test was performed in a state where the bacterial solution was stationary. However, when the bacterial solution was allowed to flow in from one surface of the member having an antibacterial effect and to flow out from the other surface and flow. It can be easily assumed that the antibacterial effect is further improved.

[0022]

[Table 1]

Example 2 Aluminum (A) was applied to one surface of a plate-like support made of a foamable polyurethane resin.
1) is vacuum-deposited to form an Al thin film on the porous wall surface present on one surface of the foamable polyurethane resin, and 77% nickel (Ni) and chromium (Cr) are formed on the other surface of the plate-like support. A member having an antibacterial action is formed by forming a metal mixture thin film composed of Ni and Cr on a porous wall surface present on the other surface of the foamable polyurethane resin by vacuum-depositing a metal mixture of 23%.

A member constructed in this manner (Example)
Was immersed in the bacterial solution of Escherichia coli and Legionella bacteria, and the number of viable bacteria per 1 ml of the bacterial solution was measured by the test method described below. The results are shown in Table 2. It can be understood that it is excellent. Comparative Example 1
In Comparative Example 2 in which a plate-shaped support made of an expandable polyurethane resin having no antimicrobial action without forming an Al thin film and a mixed thin film of Ni and Cr was used as a member, Comparative Example 2 did not use any member. Fig. 3 shows the test results when only the bacterial solution was used.

The test method will be described below. As Escherichia coli strains, Escherichia coli
Using IFO 3301, as a strain of Legionella bacteria, Legionella pneumophila was used.
GIFU 9134 was used.

The bacterial solution of Escherichia coli is cultured in a normal agar medium [Eiken Chemical Co., Ltd.] at 35 ° C. for 18 to 24 hours, and then the cells are suspended in a sterilized phosphate buffer. The solution was prepared to be 10 ⁵ / ml, and the bacterial solution of the Legionella bacterium was prepared by culturing the strain on a BCYEα agar medium (Oxoid).
After culturing at 35 ° C. for 3 days, the cells were suspended in a sterilized phosphate buffer solution to prepare a cell count of about 10 ⁵ / ml.

The culture medium and the culture conditions for counting the number of bacteria are as follows: for Escherichia coli, a normal agar medium [Eiken Chemical Co., Ltd.], at 35 ° C. for 2 days. For Legionella, BCYEα. Using an agar medium at 35 ° C. for 5 days.

As a member having an antibacterial action, 99.5
% (V / V) ethanol, and then air-dried and used for pretreatment.

The test procedure was as follows. The members were immersed in 500 ml of the bacterial solution, stored at 25 ° C., and after 3 days, the number of viable bacteria in the bacterial solution was examined. In the case of Legionella bacteria, the number was measured by a plate smear culture method using a medium for measuring the number of bacteria. In the case of Comparative Example 2, 500 ml of the number of bacteria was used as it was.

In this test, the test was performed in a state where the bacterial solution was stationary. However, when the bacterial solution was allowed to flow from one surface of the member having an antibacterial action and flowed out from the other surface. It can easily be assumed that the antibacterial effect is further improved.

[0031]

[Table 2]

Example 3 One surface of a plate-like support made of a foamable polyurethane resin was coated with aluminum (A).
1) is vacuum-deposited to form an Al thin film on the porous wall surface existing on one surface of the foamable polyurethane resin, and copper (C) is formed on the other surface of the plate-like support by electroless plating.
u) plating to form a Cu plating layer (thickness 0.5 μm) on the porous wall surface of the foamable polyurethane resin, and then nickel (Ni) plating by electroless plating to form a Ni plating
By forming a plating layer (thickness: 0.3 μm), a two-layer laminate of a Cu layer and a Ni layer is formed on a porous wall surface present on the other surface of the foamable polyurethane resin, thereby constituting a member having an antibacterial action.

When the same test as in Example 1 was performed using this member, almost the same results were obtained.

It has been confirmed that similar effects can be obtained with other metals.

[0035]

The present invention is embodied in the form as described above, exhibits an excellent antibacterial effect, and has a high mechanical strength,
It is also excellent in corrosion resistance and antimicrobial action, and when used in an air filter of an air conditioner or a filter bed of a cooling tower, it can suppress the growth of bacteria and have an excellent effect on hygiene management.

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Claims (5)

[Claims] 1. A member having an antibacterial effect in which a layer containing at least one metal selected from the group consisting of aluminum, nickel, chromium, copper, and silver is formed on a hole wall surface present on the surface of a plate-shaped porous support. . 2. An aluminum, nickel, chrome, aluminum, nickel, chromium,
Forming a layer containing one metal selected from the group of copper and silver,
A member having an antibacterial action in which a layer containing two kinds of metals selected from the group consisting of aluminum, nickel, chromium, copper, and silver is formed on the wall surface of the hole existing on the other surface. 3. The antibacterial effect according to claim 2, wherein the layer containing two metals formed on the wall surface of the hole present on the other surface of the plate-shaped porous support is composed of a mixture of two metals. Element. 4. A layer comprising two kinds of metals formed on the wall surface of a hole present on the other surface of the plate-shaped porous support,
3. The member having an antibacterial action according to claim 2, wherein each layer contains a metal selected from the group consisting of aluminum, nickel, chrome, copper, and silver. 5. The member having an antibacterial action according to claim 1, wherein the plate-shaped porous support is formed of one of a foamable polyurethane resin and a nonwoven fabric.