JPH09157675A - Antimicrobial metallic material for water-soluble cutting/machining oil and article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure cutting oil/machining oil maintaining its performance over a long period to be retained at excellent disposition through preventing its putrefaction with offensive odor due to outbreak of anaerobic bacteria or sulfate-reducing bacteria. SOLUTION: This antimicrobial metallic material has a form of threedimensional netty porous metal sintered compact made from metallic powder consisting of at least one kind among antimicrobial copper, silver and alloy thereof. The sintered compact may be borne on the surface of a stainless steel net or punching metal with the surface and reverse surface communicating with each other. The other objective antimicrobial metallic article is obtained by putting the above sintered compact into a water- and air-permeable reinforcing member 2. This antimicrobial metallic material is obtained by expanding a mixed composition slurry comprising the above-mentioned metallic powder, a water-insoluble hydrocarbon-based organic solvent, surfactant, water-soluble resin binder and water followed by molding, drying, degreasing and then sintering to form a three-dimensional netty porous metal sintered compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing an offensive odor decay due to the generation of anaerobic bacteria and sulfate-reducing bacteria and for maintaining cutting / grinding oil with excellent properties for a long period of time. It is a thing.

[0002]

2. Description of the Related Art Conventionally, emulsions (water-soluble emulsified oils)
As a nutrient for its components, the growth of bacteria is a problem, and antibacterial agents are added regularly, or electricity is applied to antibacterial metal bodies such as copper to generate a large amount of ions in a short time. Therefore, a method for preventing the generation of bacteria has been developed (mechanical research VOL45NO, 10 "Bactericidal action of metal ions" Hiroshi Nishio).

[0003]

Although a method of suppressing the generation of bacteria itself with metal ions is effective, however, in order to sufficiently elute the metal ions, auxiliary means of electrochemistry is required, It was unavoidable that the device became complicated.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted research and development to solve the above-mentioned problems. As a result, an antibacterial metal powder is used to form a three-dimensional mesh-like porous metal sintered body. When formed, this sintered body has fine pores and high porosity, resulting in a composition having a large specific surface area, which enables sufficient elution of metal ions in the emulsion.
We have found that the antibacterial property can be enhanced very easily.

The present invention has been made on the basis of the above findings, and (1) a three-dimensional mesh-like porous metal powder made of at least one of copper or silver having an antibacterial property and an alloy thereof is used. Antibacterial metal material for water-soluble cutting / grinding oil in the form of sintered metal, (2) Copper or silver with antibacterial property,
Further, a water-soluble cutting / grinding oil in which a metal powder made of at least one of the alloys is used as a three-dimensional mesh-like porous metal sintered body and bonded to the surface of a steel mesh body or porous plate communicating with the front and back surfaces. Antibacterial metallic material for use in (3) above (1)
The three-dimensional mesh-like porous metal sintered body described is housed in or reinforced with a water-permeable and air-permeable reinforcing member.
Antibacterial metal article for grinding oil, (4) Copper or silver having antibacterial properties, metal powder consisting of at least one of alloys thereof, water-insoluble hydrocarbon organic solvent, surfactant, and water-soluble resin Of an antibacterial metal material for water-soluble cutting / grinding oil, which is obtained by foaming a mixed composition slurry containing a binder and water, forming, drying, degreasing, and sintering to form a three-dimensional mesh-like porous metal sintered body. It is characterized by a manufacturing method.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. The antibacterial metallic material of the present invention is basically composed of a three-dimensional mesh-like porous antibacterial metal sintered body, and this sintered body is, for example, an antibacterial metal or alloy powder and a non-water-soluble material. By forming, drying, degreasing, and sintering a foamable mixture composition slurry containing a water-soluble hydrocarbon organic solvent, a surfactant, a water-soluble resin binder and water. It is the first to be obtained as a highly three-dimensional mesh-like porous metal sintered body.

Generally, when a surfactant and a water-insoluble hydrocarbon-based organic solvent are added to water and mixed, it is called a fine sized micelle in which the water-insoluble hydrocarbon-based organic solvent is included by the surfactant. Colloidal droplets are formed, which become uniformly dispersed and distributed in water. Even if metal powder or alloy powder is further mixed in addition to the surfactant and the water-insoluble hydrocarbon organic solvent. Forming the micelle,
This becomes a mixture that is uniformly dispersed and distributed together with the metal powder or alloy powder, and this mixture is molded into a molded body of a predetermined shape by a known doctor blade method, slip cast method, or the like, and this molded body is heated to 5 ° C. When kept at the above temperature, the water-insoluble hydrocarbon-based organic solvent has a vapor pressure larger than that of water, so that this vaporizes and becomes a gas to evaporate the molded body. Then, a large number of sized cell voids are generated, and a porous molded body is formed, and when a water-soluble resin is added to the mixture as a binder, the porous molded body has a handleable strength. When this porous compact is sintered, this sintered body has a high porosity and a high specific surface area, and is a three-dimensional mesh metal porous sintered body (hereinafter simply referred to as a porous sintered body). That is, As a result, an antibacterial metal material having excellent antibacterial properties is obtained.

However, since the above-mentioned porous sintered body may not have sufficient strength in handling, as a countermeasure, at least one surface of the porous sintered body is provided with a member having a communicating hole, For example, by constructing a reinforcing member made of corrosion-resistant metal such as stainless steel or plastic, an antibacterial metal article having sufficient strength to withstand handling and having strength can be obtained. As another measure, the above foamable mixed composition slurry is adhered to the surface of a punching metal, which is a kind of a stainless steel mesh or a porous plate having a through hole as a base, and then dried, degreased and baked. By binding and bonding to the surface as a porous sintered body, an antibacterial metal material having sufficient strength for handling is obtained.

As the metal powder in the above-mentioned mixed composition slurry (hereinafter, simply referred to as slurry), copper, silver or an alloy thereof having antibacterial properties (hereinafter, simply referred to as metal powder) is used.
Is what constitutes a porous metal sintered body after sintering,
If the average particle size is less than 0.5 μm, it becomes difficult to increase the porosity of the sintered body, while if the average particle size exceeds 500 μm, the dispersibility in the mixed raw material decreases and a homogeneous sintered body is produced. Therefore, the average particle size is 0.5 to 50
0 μm, preferably 5 to 100 μm. The proportion of the metal powder is preferably 5 to 80%, and when the proportion is less than 5%, the strength of the sintered body is rapidly reduced, while when the proportion exceeds 80%. This is based on the reason that it is difficult to increase the porosity, and in this case, a ratio of 20 to 70% is desirable.

As the water-insoluble hydrocarbon organic solvent, a water-insoluble hydrocarbon organic solvent having 5 to 8 carbon atoms (hereinafter, simply referred to as an organic solvent) is added to the slurry in an amount of 0.05 to
It is used by containing 10% by weight. In this organic solvent, micelles are formed by the action of a surfactant, and after molding, it is vaporized by keeping it at a temperature of 5 ° C. or higher to make it fine and dimension There is an action of forming bubbles in the molded body, but if the ratio is less than 0.05%, the generation of bubbles is insufficient and it is difficult to produce a porous sintered body having a desired high porosity. However, if the ratio exceeds 10%, the diameter of the micelle becomes large, and the bubbles formed in the formed body also become large accordingly, and the strength of the formed body and the metal sintered body rapidly increases. The ratio tends to decrease,
0.05 to 10%, preferably 0.5 to 5% is good. Further, the carbon number of the above organic solvent is set to 5 to 8 because the value of 4 or less and the liquid one does not exist under normal temperature and normal pressure (all are gases), while when the value is 9 or more, the vapor pressure is 9 or more. On the basis that the formation of bubbles becomes extremely difficult and the formation of bubbles becomes extremely difficult. Furthermore, it is desirable to use neopentane, hexane, isohexane, heptane, isoheptane, benzene, octane, and toluene as the organic solvent.

The above-mentioned surfactant is used by being contained in a slurry in an amount of 0.05 to 5% by weight. It has a function of forming micelles containing an organic solvent as described above, but its ratio is 0. If it is less than 0.05%, the formation of the micelles tends to be unstable, which may make it impossible to reliably form finely sized micelles. On the other hand, if the proportion exceeds 5%, Since the effect of further improvement does not appear due to the action, the ratio is 0.05 to 5%, preferably 0.5 to 3%. As the surfactant, generally, a detergent may be used, and a commercially available kitchen neutral synthetic detergent (for example, a 28% mixed aqueous solution of alkyl glycoside and polyoxyethylene alkyl ether) is sufficient.

As the water-soluble resin binder, a slurry is used.
It is used by containing 0.5 to 20% by weight therein, but it has the effect of improving the strength of the porous molded body and making it possible to handle it, but if the proportion is less than 0.5%, It is difficult to obtain the desired strength-enhancing effect.
If it exceeds 0%, it tends to be difficult to mold it into a predetermined shape, so the ratio is 0.5 to 20%, preferably 2 to 10%.
% Is good. Further, as the water-soluble resin, it is preferable to use methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, carboxymethyl cellulose ammonium, ethyl cellulose, and polyvinyl alcohol.

As the plasticizer, polyhydric alcohol,
Oils and fats, ethers, esters and the like are used, but since they have the action of imparting plasticity to the molded body, they are added as necessary, but as the polyhydric alcohol, ethylene glycol, polyethylene glycol, and glycerin,
The oils and fats include sardine oil, rapeseed oil, and olive oil, the ethers include petroleum ether, and the esters include diethyl phthalate, diN-butyl phthalate, diethylhexyl phthalate, di-N-octyl phthalate, sorbitan monooleate, and sorbitan triole. The use of ate, sorbitan palmitate and sorbitan stearate, respectively, is preferred.

The value of the specific surface area is important for obtaining the high antibacterial performance required by the antibacterial metal material of the present invention, and if the value is 300 cm ² / cm ³ or more, the above high antibacterial performance is obtained. Desirable for.

[0015]

EXAMPLES Examples of the present invention will be specifically described below. First, copper, silver or alloy powders thereof having an average particle size shown in Table 1 as metal powder, neopentane (hereinafter referred to as A-1), hexane (also A
-2, the same shall apply hereinafter), isohexane (A-3), heptane (A-4), isoheptane (A-5), benzene (A-6), octane (A-7), and toluene (A).
-8), the above-mentioned commercially available kitchen neutral synthetic detergent as a surfactant, methylcellulose (hereinafter referred to as B-1), hydroxypropylmethylcellulose (hereinafter also referred to as B-2) hydroxyethyl as a water-soluble resin binder. Methyl cellulose (B-3), carboxymethyl cellulose ammonium (B-4), ethyl cellulose (B-
5) and polyvinyl alcohol (B-6), as a plasticizer, polyethylene glycol (hereinafter referred to as C-1),
Olive oil (also referred to as C-2, hereinafter the same), petroleum ether (C-3), diN-butyl phthalate (C-4), and sorbitan monooleate (C-5) were prepared, and these are shown in Table 1. The composition shown was mixed with water and mixed under normal conditions to prepare foamable slurries 1 to 8 for the antibacterial metal material of the present invention (hereinafter referred to as slurries 1 to 8 of the present invention).

[0016]

[Table 1]

Next, bubble formation under the conditions shown in Table 2,
By performing degreasing and sintering, the porous metal sinters 1 to 8 for the present invention (hereinafter, simply referred to as the porous sinter 1 to the present invention
8) was produced. These sintered bodies have plasticity,
These were compressed to produce antibacterial metallic materials 1 to 8 of the present invention shown in Table 3 (hereinafter referred to as metallic materials 1 to 8 of the present invention). The porosity was measured by observing the cross section under a microscope, and the specific surface area was measured by the BET method. As the metal material 8 of the present invention, as shown in FIG. 2, the antibacterial metal article of the present invention was used in which reinforcing members made of stainless steel having through holes were attached and reinforced on both surfaces of the metal material.

[0018]

[Table 2]

[0019]

[Table 3]

Further, as an example, a stainless steel mesh body was prepared, and each of the stainless steel mesh bodies was dipped in a foaming slurry having the composition shown in Table 4, and
The antibacterial metal material of the present invention having a structure in which a porous sintered body having the properties shown in Table 6 is sinter-bonded to the surface of a mesh body made of stainless steel by performing bubble formation, degreasing, and sintering under the conditions shown in 9 to 16 (hereinafter, referred to as metallic materials 9 to 16 of the present invention) were produced. The porosity and specific surface area at that time were measured by the same method as described above.

[0021]

[Table 4]

[0022]

[Table 5]

[0023]

[Table 6]

Antibacterial metal material 1 obtained as described above
.About.16 were placed in a grinding fluid tank of a cylindrical grinder as shown in FIG. 1 and tested. Grinding conditions and the like are as follows: Tank capacity: 100 l Oil used: JIS W2 type, dilution rate 50 times Grinding material: SUJ-2 Grinding stone: WA80H (Vitrified bond grinding stone) Grinding liquid flow rate: 1 liter / min ． When the degree of putrefaction was continuously confirmed every month from the time when the grinding fluid was prepared, a putrid smell was generated in 2 months when nothing was done. On the other hand, when about 200 g of the antibacterial metal materials 1 to 8 of the present invention as a porous metal sintered body or an article containing this is hung in a grinding fluid tank as shown in FIG. However, no rotten odor was observed. Further, the antibacterial metallic material 9 to 16 of the present invention
In a state where the same amount as the above is installed as the porous metal sintered body of the present invention on the downstream side of the settling tank in the tank.
No spoilage odor was observed even if left for more than a month.

[0025]

As is apparent from the above results, the use of the antibacterial metal materials 1 to 16 of the present invention makes it possible to prevent the generation of offensive odors in, for example, a grinding fluid tank by a very simple method. To be This is, for example, a slurry consisting of antibacterial metal or alloy powder, an organic solvent, a surfactant, a water-soluble resin binder and water is molded, dried and sintered,
An antibacterial metal material or a stainless steel mesh produced by forming a porous sintered body of the antibacterial metal itself is dipped in a slurry similar to the above, dried and sintered to obtain a porous sintered body. In the antibacterial metal material produced by sticking, the porous sintered body has a surface with a high porosity and a large specific surface area, so that the elution of antibacterial metal ions in the grinding oil emulsion is sufficient. Therefore, it has excellent antibacterial properties. The use of the antibacterial metal material of the present invention which is excellent in antibacterial action and can be easily used makes a great contribution to the related fields.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of use of the antibacterial metal article of the present invention in a grinding fluid tank.

FIG. 2 is a schematic view showing an example of the antibacterial metal article of the present invention.

[Explanation of symbols]

 1 Antibacterial porous metal material 2 Reinforcement material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C22C 1/08 E03C 1/26 A E03C 1/26 B22F 5/00 101B // C10N 10:02 30 : 12 40:22 (72) Inventor Michiru Kono 1-297 Kitabukuro-cho, Omiya-shi, Saitama Mitsubishi Materiality Co., Ltd.

Claims (4)

[Claims] 1. A water-soluble cutting / grinding oil, characterized in that a metal powder comprising copper or silver having antibacterial properties and at least one of alloys thereof is used as a three-dimensional mesh-like porous metal sintered body. Antibacterial metal material for use. 2. A metal powder composed of copper or silver having antibacterial properties, and at least one of alloys thereof, is bonded to the surface of a mesh body having a through hole or a porous plate as a three-dimensional mesh-like porous metal sintered body. An antibacterial metal material for water-soluble cutting / grinding oil characterized by being hardened. 3. A water-soluble cutting / grinding oil, characterized in that the three-dimensional mesh-like porous metal sintered body according to claim 1 is housed or reinforced in a reinforcing member having water permeability and air permeability. Antibacterial metal articles. 4. A metal powder comprising copper or silver having antibacterial properties, and at least one of alloys thereof, a water-insoluble hydrocarbon organic solvent, a surfactant, a water-soluble resin binder and water. A method for producing an antibacterial metal material for water-soluble cutting / grinding oil, which comprises foaming a mixed composition slurry containing, molding, drying, degreasing and sintering to form a three-dimensional mesh-like porous metal sintered body .