JPH09149854A - Antimicrobial metallic article having water retaining property and water permeability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to surely prevent the slime of a crude refuse cage, etc., arranged in a kitchen sink for cooking when this article is applied to the crude refuse cage, etc., by housing a metallic body consisting of an antimicrobial metal having a sponge-like structure into a reinforcing container having water permeability and air permeability. SOLUTION: The sponge-like porous sintered metallic body 1 which is the sponge-like porous metallic body consisting of hole parts and skeleton parts having 100μm to 5mm hole size and is constituted by forming the skeleton parts of the antimicrobial metal having the fine hole finer than the size of the holes of the hole parts is used at the time of forming such antimicrobial products which eliminates the occurrence of the slime over a long period when applied with the products to the crude refuse cages made of plastics and stainless steels. Namely, the sponge-like porous sintered metallic body 1 is housed into the reinforcing container 2 having the water permeability and air permeability to form the antimicrobial metallic article. The article is kept arranged into the crude refuse cage made of the plastics or stainless steel. As a result, the occurrence of the slime over a long period is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial metal article used mainly for preventing slimming of plastic garbage baskets and stainless steel baskets arranged in a kitchen sink for cooking.

[0002]

2. Description of the Related Art Conventionally, for example, a plastic garbage basket and a stainless steel garbage basket placed in a kitchen sink for cooking are cooked twice a day at home of a family of four.
Under normal conditions of use, such as throwing away raw garbage once a day, white slimy slimy skin is produced in about 3 days. The slime is caused by mold and bacteria that propagate in the raw garbage basket. In order to remove and prevent the above, cleaning with a sterilizing bleaching agent, spraying an antibacterial agent after cleaning, using a garbage bag coated with an antibacterial agent together, or replacing with a Cu garbage basket Measures are taken.

[0003]

However, cleaning with a bactericidal bleaching agent, spray application of an antibacterial agent after cleaning,
Furthermore, even if you use a garbage bag coated with an antibacterial agent together, the kitchen sink for cooking uses a large amount of tap water, so its sterilization and antibacterial action do not continue for a long time,
The slimming of plastic garbage baskets and stainless steel baskets can be suppressed for only a few days to 10 days. On the other hand, if the garbage basket itself is replaced with one made of Cu, the sterilizing effect of Cu can prevent the generation of slime for a long period of time, but the garbage basket made of Cu becomes dark during use and sometimes patina occurs. The kitchen sink is usually made of stainless steel, which causes problems such as poor color matching.In addition, plastics and stainless steel garbage baskets are already used in so many households. Therefore, it is desired to develop an antibacterial product that prevents slimming of plastic garbage baskets and stainless steel garbage baskets for a long period of time, instead of purchasing and replacing Cu garbage baskets.

[0004]

In view of the above-mentioned problems, the present inventors have used a conventional garbage basket made of plastics, stainless steel or the like as it is, and simply placed it in the basket for a long period of time. As a result of various studies to develop an antibacterial product that prevents slimming, Fig. 2
As shown in, the skeleton portion 12 of the sponge-like porous metal body composed of the pore portion 11 and the skeleton portion 12 is
Sponge composed of fine porous sintered metal having fine pores 13 finer than the size of the pores, and the porous sintered metal is Cu, Cu alloy, Ag or Ag alloy which is an antibacterial metal. The antibacterial metal article in which the porous porous sintered metal body 1 is housed in a water-permeable and air-permeable reinforcing container 2 as shown in FIG. 1 is placed in a plastic or stainless steel garbage basket. We obtained the finding that slimming does not occur over a long period of time when placed.

The mechanism of the antibacterial action when the above antibacterial metal article is installed in the kitchen basket of the kitchen sink will be described. The kitchen sink is usually used intermittently, water is drained when it is used, and water is drained when it is not used. Therefore, the antibacterial metal article is used under the condition that water is intermittently flowed. Since the sponge-like porous sintered metal body has fine pores in the skeleton portion,
There is a property that water is retained inside and on the skeleton by surface tension even when water is not flowing, and since a very small amount of metal ions are eluted from the metal body forming the skeleton in the water, a kitchen sink When not in use, the sponge-like porous sintered metal body is in a state in which an aqueous solution containing an extremely small amount of metal ions is held by the skeleton portion due to surface tension. Although the elution reaction of the metal ion is likely to occur in an environment where oxygen is present, the sponge-like porous sintered metal body has excellent air permeability because it has the pores, and the elution reaction of the metal ion is Proceed quickly. When a kitchen sink is used, water flowing at that time causes the sponge-like porous sintered metal body to flow out an aqueous solution containing an extremely small amount of metal ions retained by the surface skeleton by the surface tension, A trace amount of metal ions will spread throughout the garbage basket. Moreover, since the sponge-like porous sintered metal body has the pores, it has excellent water permeability, and the outflow of the aqueous solution containing the metal ions proceeds rapidly. When the sponge-like porous sintered metal body is made of an antibacterial metal such as Cu, a Cu alloy, Ag or an Ag alloy, ions of these metals are present in an extremely minute amount of about 20 ppb. Then, since it has an excellent antibacterial property that various bacteria cannot proliferate around it, the antibacterial property of the antibacterial metal acts on the entire garbage basket by the repeated elution and outflow of ions by the mechanism described above. As a result, when the antibacterial metal article is placed in the garbage basket, slimming does not occur for a long period of time.

The garbage basket is one in which garbage is frequently taken in and out, but the sponge-like porous sintered metal body is
Since it is extremely porous, it does not have sufficient mechanical strength to withstand the impact applied to the garbage every time it is taken in and out.
However, if the sponge-like porous sintered metal body is housed in a water-permeable and air-permeable reinforcing container as shown in FIG. 1, for example, sufficient mechanical strength can be obtained as a whole, It will withstand long-term use.

The present invention has been made on the basis of such findings, and (1) A metal body having a sponge-like structure composed of pores and skeletons is housed in a water-permeable and air-permeable reinforcing container. An antibacterial metal article having water retention and water permeability, wherein the metal body is made of an antibacterial metal, and the case portion is made of a porous sintered metal having fine pores. A skeleton portion of a metal substrate having a sponge-like structure having fine pores with an average pore diameter of 0.1 to 20 μm and a porosity of 10 to 55%, which is a fine porous sintered metal body, wherein the pore portion is Has a pore size of 10
An antibacterial metal article having a water-retaining property and a water permeability of 0 μm to 5 mm and a total porosity of the sponge-like metal body being 80 to 98%, (3) the metal body having the sponge-like structure is Cu, It is characterized by an antibacterial metal article having water retention and water permeability, which is made of Cu alloy, Ag or Ag alloy.

The sponge-like porous sintered metal body comprising pores and skeleton of the present invention comprises a porous sintered body having fine pores in the skeleton and has the above-mentioned elution and outflow function of metal ions. Any microstructure and composition provided that it is provided with and is made of an antibacterial metal has the effect of preventing slime, but the fine pores in the skeleton of the sponge-like porous sintered metal substrate are Has an average fine pore size of 0.
It is desirable that the range is 1 to 20 μm (more preferably 0.5 to 10 μm), and the porosity of the skeleton portion is 5 to 55% (more preferably 10 to 30%). . Further, in order to provide the sponge-like porous sintered metal body with sufficient air permeability and water permeability,
The pore diameter of the pores is preferably in the range of 100 μm to 5 mm (more preferably 200 μm to 1 mm), and the total porosity of the sponge-like porous sintered metal body is 80 to 98% (one layer. (Preferably 85 to 96%)
It is desirable that Further, in order to have excellent antibacterial properties, the sintered metal body having the sponge-like structure is preferably made of Cu, CU alloy, Ag or Ag alloy.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. The sponge-like porous sintered metal body used in the present invention can be manufactured by a foaming slurry preparation step, a foaming step, a molding step, a drying step, a degreasing step, and a sintering step, and after the sintering, pressing is performed. The dimensions can be adjusted by rolling, punching or the like.

In the above foaming slurry preparation step,
For example, it contains a metal powder, a water-soluble resin binder, a surfactant, water, etc. and has a viscosity of 30,000 to 50,000 c at room temperature.
Prepare a ps slurry. Here, the particle size of the metal powder is such that the average particle size is 500 μm or less, particularly 0.5 to 50 μm.
The range of m is preferable, and the blending amount of the metal powder in the slurry is preferably 5 to 80% (weight%, the same hereinafter), and particularly preferably 30 to 80%.

The water-soluble resin binder has a function of imparting viscosity to the slurry and a function of retaining the shape of the porous molded body when the slurry is dried.
Hydroxypropyl methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose ammonium, ethyl cellulose,
Polyvinyl alcohol and the like can be exemplified, and the blending amount of the water-soluble resin binder in the slurry is 0.
The range of 5 to 20%, especially 2 to 10% is desirable.

The surfactant has a foaming action and a bubble stabilizing action, and is an anionic surfactant such as alkylbenzene sulfonate, α-olefin sulfonate, alkane sulfonate, polyethylene glycol derivative, polyhydric alcohol. Examples thereof include nonionic surfactants such as derivatives, and the amount of the surfactant blended in the slurry is preferably 0.05 to 5%, more preferably 0.5 to 3%.

For the evaporative blowing agent, a volatile organic solvent can be selected as the evaporative blowing agent, and it has an effect of generating gas to form bubbles, and pentane, neopentane, hexane, isohexane, isoheptane, Examples thereof include benzene, octane, and toluene. The amount of the evaporative blowing agent in the slurry is 0.01 to 5%, particularly 0.5.
The range of up to 2% is desirable.

In addition to the above components, the foamable slurry may contain a plasticizer, a pore-forming promoting combustion agent, and the like. The plasticizer is for imparting plasticity to the molded product, and is a polyhydric alcohol such as ethylene glycol, polyethylene glycol, glycerin, sardine oil, rapeseed oil, oils and fats such as olive oil, ethers such as petroleum ether, diethyl phthalate, Examples thereof include esters such as diN-butyl phthalate, diethylhexyl phthalate, dioctyl phthalate, sorbitan monooleate, sorbitan monooleate, sorbitan palmitate, and sorbitan stearate, and the amount of the plasticizer compounded in the slurry. Is preferably 0.1 to 15%, particularly preferably 2 to 10%.

The bubble formation promoter is used to promote the formation of pores by eliminating it during the firing of the dry molded product, and is made of pulp, cotton, lint, corn starch, carboxymethyl cellulose, and a water-insoluble cellulose resin. Examples thereof include polyvinyl butyral resin, acrylic resin, polyethylene resin, and the like.

Next, the foamable slurry prepared as described above is molded by a slip casting method or a doctor blade method, kept in a high humidity atmosphere at a temperature of 25 to 50 ° C., and evaporated. After the mold foaming agent is volatilized and foamed, it is dried to form a green body, and the green body is heated to be subjected to a binder removal treatment and then fired in a reducing atmosphere or the like, whereby the organic component is substantially combusted and vaporized. It is possible to manufacture a sponge-like porous sintered metal body that has only the metal component remaining and has pores and a skeleton.

Next, the antibacterial metal article of the present invention can be manufactured by placing the sponge-like porous sintered metal body in a water-permeable and air-permeable reinforcing container.
As the material of the reinforcing container, plastics or stainless steel is usually used.

[0018]

EXAMPLES Examples will be specifically described below.
Metal powder having the composition and average particle size shown in Table 1, water-soluble methyl cellulose, a surfactant, glycerin, hexane and water were mixed into the composition shown in Table 1 to form a slurry, and the thickness was 0 according to the doctor blade method. 4 mm, then in an atmosphere of temperature: 40 ° C., humidity: 95%,
After performing the foaming treatment by holding for the time shown in Table 1, the moisture was dried in a far infrared dryer set to a heater temperature of 150 ° C to produce a green sheet, and then the green sheet was heated to 500 ° C in the air. After holding for 30 minutes to perform debindering treatment, sintering was performed under the conditions of the atmosphere, temperature, and holding time shown in Table 1, and a plate-like sponge-like porous calcination having a skeleton portion made of finely porous sintered metal. The bonded metal bodies a to f were manufactured.

[0019]

[Table 1]

The sponge-like porous sintered metal bodies a to
The thickness of f, the average fine pore diameter and porosity of the skeleton, and the porosity of the entire sponge-like porous sintered metal body were measured,
The results are shown in Table 2. Here, the average fine pore diameter and the porosity of the skeleton were measured by image analysis of the cross section of the sample, and the porosity of the entire sponge-like porous sintered metal body was measured from the size and weight of the sample.

[0021]

[Table 2]

Next, the obtained sponge-like porous sintered metal bodies a to f were cut into a disk shape having a diameter of 50 mm and placed in a lattice-shaped plastic container as shown in FIG. Metallic articles A to F were manufactured.

Next, the antibacterial metal articles of the present invention are placed one by one in the garbage baskets incorporated in the drain ports of kitchen sinks for general household use, and after the installation, the garbage baskets are not washed. Perform daily cooking work, observe the state of sliminess of these garbage baskets once a day, continue for 30 days, check the presence or absence of slime, and the number of days required for slime to occur. The results are shown in Table 3.

[0024]

[Table 3]

For comparison, an antibacterial basket was washed with a chlorine-based bleaching agent, and with a chlorine-based bleaching agent and a spray foam containing an organic antibacterial agent applied thereto. If the garbage bag coated with the agent is used together and the garbage bag is only replaced after the test is started, the daily cooking work is performed under the following two conditions, and the state of sliminess of the garbage basket is checked daily. It was observed once and was continuously carried out for 30 days, and the presence or absence of slime and the number of days required for slime are also shown in Table 3.

[0026]

As is clear from the results of Table 3, the garbage baskets provided with the antibacterial metallic articles A to F of the present invention do not produce slime and have an excellent slime preventive function. it is obvious. The antibacterial article of the present invention can prevent the generation of slime over a long period of time only by placing it in a garbage basket made of plastics or stainless steel which is already used in a great number of households, It is sanitary and extremely convenient, and if the water-permeable and air-permeable reinforcing container that houses the sponge-like porous sintered metal body is made of plastics or stainless steel, for example, it is visually colorful or clean. It can be made into a molded object, and it can give a feeling of cleanliness and enjoyment as an accessory of the garbage basket that gave discomfort and uncleanness to the daily cooking work. Furthermore, the Cu garbage basket is newly added. Compared to purchasing and replacing, it also makes effective use of resources and is economical, which greatly contributes to daily cooking work.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an antibacterial metal article having water retention and water permeability of the present invention.

FIG. 2 is an explanatory view showing a sponge-like porous sintered metal body used in the present invention.

[Explanation of Codes] 1 Sponge-like porous sintered metal body 2 Reinforcing container 11 Pores 12 Skeleton 13 Fine pores (skeleton)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Kono 1-297 Kitabukuro-cho, Omiya-shi, Saitama Mitsubishi Materials Co., Ltd.

Claims (3)

[Claims] 1. An article in which a metal body having a sponge-like structure composed of pores and a skeleton is housed in a water-permeable and air-permeable reinforcing container, the metal body being made of an antibacterial metal. An antibacterial metal article having water retention and water permeability, wherein the skeleton portion is made of a porous sintered metal having fine pores. 2. A fine porous sintered metal body, wherein the skeleton part of the metal body having a sponge-like structure has fine pores with an average pore diameter of 0.1 to 20 μm, and the porosity is 10 to 55%. And the hole diameter of the hole portion is 100 μm to 5 m
m, and the total porosity of the sponge-like porous sintered metal body is 80 to 98%.
An antibacterial metal article having water retention and water permeability as described. 3. The metal body having the sponge-like structure is C
The antibacterial metal article having water retention and water permeability according to claim 1 or 2, comprising u, Cu alloy, Ag or Ag alloy.