JP5145796B2 - Disinfection filter and manufacturing method thereof - Google Patents

Description

  The present invention relates to a sterilization filter capable of removing microorganisms in water or air.

  Many microorganisms such as fungi and mold exist in the air or water, and a filter for removing the microorganisms is used when it is desired to supply clean air to a house, an air conditioner, or a home appliance. Antibacterial agents are used when it is desired to suppress the growth of microorganisms.

  For example, the conventional filter described in Patent Document 1 is a polymer foam having antibacterial and antifungal functions, which contains zeolite holding a metal having a bactericidal action. It has been shown that a polymer foam having antibacterial and antifungal functions can be obtained by mixing and foaming an antibacterial zeolite, a foaming material, and a polymer.

In addition, Patent Document 2 discloses a means for preventing the growth of microorganisms at the same time as safety, particularly sterilization, rather than suppressing the growth of microorganisms by the antibacterial performance of chemical agents that elute antibacterial components. A method of providing a means is shown. This is the removal of an electrolyte solution having a configuration in which a molded body in which two types of metal powders having different oxidation-reduction potentials are dispersed and mixed and kneaded in a resin so as to have conductivity is placed in contact with the electrolyte solution to be sterilized. Bacteria method. Since the microorganisms in the electrolyte have a surface charge, they are attracted to the vicinity of the metal powder by an electrical action and are sterilized.
Japanese Patent Laid-Open No. 62-241932 JP 2005-118726 A

  The filter of Patent Document 1 is effective against microorganisms that have collided with the filter surface and filtered and collected by the action of a zeolite holding a sterilizing metal, but removes microorganisms from water or air. There was no fungal action. Therefore, in order to remove microorganisms, it is necessary to use a filter with a fine eye and a high pressure loss, and a sterilization filter with a lower pressure loss has been demanded. In addition, in a filter made by mixing antibacterial zeolite, foaming material and polymer, the antibacterial zeolite is likely to be embedded in the resin, and the dispersion state of the zeolite is likely to be biased during the foaming process. There was a problem that it was difficult to give the entire filter antibacterial properties. Furthermore, in the sterilization means, dead bodies of microorganisms may remain in the water or in the air, and it is desirable to remove them in order to maintain comfort, and a sterilization means is desired rather than a sterilization means.

  Further, in the method described in Patent Document 2, since microorganisms can be sterilized by electrical action, a sterilizing filter with low pressure loss is obtained by applying the method described in Patent Document 2 to a coarse filter. I was able to. However, in order to maintain the effect of the sterilization filter, it is necessary to prevent peeling of the metal powder, and a method capable of firmly fixing the metal powder on the filter surface has been demanded.

  In order to solve the above-described problems, an object of the present invention is to provide a sterilizing filter that does not cause peeling, does not bury an antibacterial component in a resin, and has a low pressure loss, and a method for manufacturing the same.

For method for manufacturing a sterilization filter of the present invention to achieve the above object, as described in claim 1, the substrate having a water-passing property, oxidation-reduction potential of the substrate and the swellable solvent and a binder resin and a different two or more kinds of metals, the metal is a metal powder or two or more of the said metal with different redox potential and the solvent and the binder resin, the electric field conducting the metal to each other is generated the sterilization solution obtained by mixing to coating, before Kimotozai, after applying the sterilization solution, subjected to heat treatment for heating, the binder resin together with evaporating the solvent by the heat treatment It is characterized by carrying out polymerization and thermosetting.

Also, the base material having a water passing property, the include a base material and a swellable solvent and a binder resin and two or more kinds of metals having different oxidation-reduction potential, the metal is a metal powder, wherein said solvent binder 2 or more kinds of said metal having a different resin and the oxidation-reduction potential, the metal to each other by conducting a sterilization solution was applied obtained by mixing such an electric field is generated, prior Kimotozai, the disinfectant After applying the liquid, exhaust treatment is performed to ventilate at normal temperature, and further heat treatment is performed. After the substrate is dried while maintaining the shape of the substrate by the exhaust treatment, the solvent is volatilized by the heat treatment. In addition, the binder resin is polymerized and heat-cured. In addition, the binder resin is blended so that the blending ratio with respect to the total solid content of the sterilizing solution is 7 wt% or more and less than 35 wt% . In addition, a conductivity imparting agent is added.

  The solvent is volatile at a temperature of 200 ° C. or lower.

  In addition, the base material contacted with the sterilizing solution is swelled and then contracted.

  In addition, the metal includes any one or more selected from gold, silver, copper, zinc, aluminum, nickel, brass, and alloys thereof.

  The metal is characterized by having antibacterial properties.

  The metal particle size is 250 μm or less.

  Further, the base material has a three-dimensional structure.

  Further, the substrate is characterized in that it has a foamed shape or a three-dimensional woven fabric shape.

  Moreover, the opening diameter of the opening part which a base material has is 1 mm or more, It is characterized by the above-mentioned.

Moreover, the sterilization filter of the present invention includes a base material having water permeability, includes a swellable solvent, a binder resin, and two or more kinds of metals having different oxidation-reduction potentials, and the metal is a metal powder, Applying a sterilization solution obtained by mixing a solvent, the binder resin, and two or more kinds of metals having different oxidation-reduction potentials so that the metals are electrically connected to generate an electric field on the substrate, After applying the sterilization solution to the base material, a heat treatment is performed to heat, the solvent is volatilized by the heat treatment, the binder resin is polymerized and thermoset, and the metals are bonded to each other on the surface of the base material. It is a sterilization filter in which a battery structure is formed by conduction . Moreover, the sterilization filter of the present invention includes a base material having water permeability, includes a swellable solvent, a binder resin, and two or more kinds of metals having different oxidation-reduction potentials, and the metal is a metal powder, Applying a sterilization solution obtained by mixing a solvent, the binder resin, and two or more kinds of metals having different oxidation-reduction potentials so that the metals are electrically connected to generate an electric field on the substrate, After applying the sterilization solution to the base material, performing an exhaust treatment for venting and exhausting at normal temperature, further performing a heat treatment for heating, and drying while maintaining the shape of the base material by the exhaust processing, It is a sterilization filter in which a battery structure is formed by volatilizing the solvent by heat treatment, polymerizing and thermosetting the binder resin, and conducting the metals on the surface of the base material. And features.

According to the present invention, the solvent can be quickly volatilized by a heat treatment that performs heating, the binder resin can be polymerized and heat-cured, peeling does not occur, antibacterial components are not buried in the resin, pressure loss And a method for producing the same can be provided.

The invention of claim 1, wherein the present invention, the base material having a water passing property, comprising two or more kinds of a metal having different oxidation-reduction potential and swellable solvent and a binder resin said substrate, said metal metal a powder, two or more of the said metal with different redox potential and the solvent and the binder resin, wherein the metal to each other by conducting a sterilization solution was applied obtained by mixing such an electric field is generated, before Kimotozai, after applying the sterilization solution, subjected to heat treatment for heating, by the heat treatment is obtained by and performing polymerization and thermal curing of the binder resin together with evaporating the solvent. It has the effect | action that a solvent can be volatilized quickly by heat processing and superposition | polymerization and thermosetting of binder resin can be performed. In addition, after the metals having different oxidation-reduction potentials contained in the sterilization solution are applied to the base material, the metal structures come into contact with each other on the surface of the base material to form a battery structure. Since a potential difference is generated between the metals of the battery structure, the charged microorganisms can be attracted and removed by electric force. Further, by swelling the substrate with a solvent, the binder and the metal enter into the unevenness and voids of the substrate, and the binder, the substrate and the metal are firmly bonded. As a result, there is an effect that metal peeling from the filter hardly occurs. Since using a metal powder, due to the low penetration of the large size substrate than the binder, the metal powder will be present more in the surface than in the interior of the substrate. As a result, the metal powder is exposed to the surface portion of the base material without being buried in the binder, and has the function of exhibiting a sterilizing effect.

In addition, after applying the sterilization solution to the base material, it is characterized by performing an exhaust treatment for venting and exhausting at room temperature, and further performing a heat treatment for heating, and maintaining the shape of the base material by the exhaust processing. However, after drying slowly, the solvent is quickly volatilized by heat treatment, and the binder resin can be polymerized and thermally cured. Since using a metal powder, due to the low penetration of the large size substrate than the binder, the metal powder will be present more in the surface than in the interior of the substrate. As a result, the metal powder is exposed to the surface portion of the base material without being buried in the binder, and has the function of exhibiting a sterilizing effect. Moreover, it is characterized by blending the binder resin so that the blending ratio with respect to the total solid content of the sterilization solution is 7 wt% or more and less than 35 wt%, and by setting the solid content of the binder to 7 wt% or more, It has the effect | action that it can fix to a base material firmly, without a metal peeling. Further, it is characterized in that a conductivity imparting agent is added, and has an effect that the electrical joining state of metals having different oxidation-reduction potentials is improved by the conductivity imparting agent such as carbon. Since a potential difference is generated between the metals of the battery structure, the charged microorganisms can be attracted and removed by electric force. Moreover, even if the metal is not in direct contact with the surface of the substrate, the battery structure can be formed by conducting through the conductivity imparting agent, so that the amount of metal used can be reduced. By reducing the amount of metal, it is possible to produce a sterilization filter that is economical and lightweight.

  Further, the solvent is characterized by having volatility at a temperature of 200 ° C. or lower, and it is possible to prevent the base material from being altered or deformed by vaporizing the solvent at a temperature of 200 ° C. or lower. Has an effect.

  In addition, the base material contacted with the sterilization solution swells and then contracts. By causing the base material to swell with a solvent, the binder and the metal are intruded into the irregularities and voids of the base material, and then shrink-cured, thereby improving the adhesive force between the binder, the base material, and the metal. As a result, there is an effect that metal peeling from the filter hardly occurs.

  Further, the metal includes any one or more selected from gold, silver, copper, zinc, aluminum, nickel, brass, or an alloy thereof, and a battery structure is obtained by using the metal. The formed and charged microorganisms can be attracted and removed by electric force.

  Further, the metal is characterized by having antibacterial properties, and has an effect that the collected microorganisms can be killed by the antibacterial action of the metal.

  Further, the metal particle size is 250 μm or less. By setting the metal to 250 μm or less, a sterilizing solution in which the metal does not settle and no difference in concentration can be produced, and a sterilizing filter in which metal components are uniformly dispersed using the sterilizing solution is provided. Can be made.

  In addition, the substrate is characterized by a three-dimensional structure, and has the effect that the sterilization effect can be enhanced by increasing the surface area of the sterilization filter.

  In addition, the substrate is characterized by a foamed shape or a three-dimensional woven fabric shape. By making these shapes excellent in water permeability or air permeability, pressure loss is low, and water and air containing bacteria A sterilization filter that can easily pass through the inside of the substrate can be obtained. Moreover, it has the effect | action that the surface area of a disinfection filter can be increased and the disinfection effect can be improved.

  In addition, the opening diameter of the opening of the base material is 1 mm or more, and when applying the sterilizing solution to the base material, the sterilizing solution can easily enter the inside of the base material. It is possible to make a sterilization filter in which the portion is not easily clogged and the metal component is uniformly dispersed.

Further, the substrate includes a water-permeable base material, and includes a swellable solvent, a binder resin, and two or more kinds of metals having different oxidation-reduction potentials, and the metal is a metal powder, and the solvent, the binder resin, and the oxidation-reduction A sterilizing solution obtained by mixing two or more kinds of metals having different potentials so that the metals are electrically connected to generate an electric field is applied to the substrate, and the sterilizing solution is applied to the substrate. After the coating, a heat treatment for heating is performed, the solvent is volatilized by the heat treatment, the binder resin is polymerized and thermoset, and the metals are connected to each other on the surface of the base material to form a battery structure. This is a sterilization filter that can be easily obtained as a filter having sterilization properties. Further, the substrate includes a water-permeable base material, and includes a swellable solvent, a binder resin, and two or more kinds of metals having different oxidation-reduction potentials, and the metal is a metal powder, and the solvent, the binder resin, and the oxidation-reduction A sterilizing solution obtained by mixing two or more kinds of metals having different potentials so that the metals are electrically connected to generate an electric field is applied to the substrate, and the sterilizing solution is applied to the substrate. After applying, the exhaust treatment is performed to ventilate at room temperature, further heat treatment is performed, the substrate is dried while maintaining the shape of the substrate by the exhaust treatment, and then the solvent is volatilized by the heat treatment. It is a sterilization filter in which a battery structure is formed by conducting polymerization / thermosetting of the binder resin and allowing the metals to conduct on the surface of the base material. An effect that can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows an example of a cross-sectional view of the sterilization filter. A sterilizing solution is applied to the base material 11 having water permeability or air permeability, and the binder 12 penetrates the surface and the inside of the base material 11 with a solvent capable of swelling the base material 11 contained in the sterilizing solution. Yes. The binder 12 plays a role of immobilizing the base material 11 and two or more kinds of metals having different oxidation-reduction potentials. Here, the metals are copper 13 and zinc 14. Moreover, carbon as the conductivity imparting agent 15 is blended in the sterilization solution, and the copper 13 and the zinc 14 are made to conduct. Copper 13 and zinc 14 as metals having different oxidation-reduction potentials contained in the sterilization solution are applied to the base material 11, and then the metal contacts with each other on the surface of the base material 11 to form a battery structure. Is done.

  Since a potential difference is generated between the metals of the battery structure, the charged microorganisms can be attracted and removed by electric force. Further, by swelling the substrate with a solvent, the binder and the metal enter into the unevenness and voids of the substrate, and the binder, the substrate and the metal are firmly bonded. As a result, there is an effect that metal peeling from the filter hardly occurs. Further, when metal powder is used, the metal powder is present on the surface more than the inside of the substrate because the size is larger than the binder and the penetrating power to the substrate is low. As a result, the metal powder is exposed to the surface portion of the base material without being buried in the binder, and has the function of exhibiting a sterilizing effect.

  On the other hand, in the conventional method of mixing and foaming an antibacterial zeolite, a foaming material and a polymer, the material is appropriately dispersed, so that the proportion of the antibacterial zeolite which is an active ingredient is embedded in the resin is high. It is difficult to sufficiently exert the bactericidal action.

  FIG. 2 shows a schematic cross-sectional view in which the substrate surface of FIG. 1 is enlarged. Copper 13 and zinc 14 as two or more kinds of metals having different oxidation-reduction potentials form a film on the surface of the substrate 11 together with carbon as the conductivity-imparting agent 15 and the binder 12. It is assumed that water containing the microorganisms 16 flows from the A to the B direction on the film. Since the microorganism 16 contained in the water has a constant charge as its surface charge, an action of moving according to the direction of the electric field is produced when an electric field is applied to the water. Since the copper 13 and the zinc 14 are electrically joined directly or via the conductivity-imparting agent 15, they have a positive and negative charge, and an electric field is generated between them. Since the microorganism 16 has a charge, it is attracted and aggregated in the direction of the metal by the action of the electric field. As a result, the water containing the microorganisms 16 is sterilized as it proceeds from A to B.

  In the method of sterilization only by physical contact, the sterilization performance will not be exhibited unless the opening of the substrate is narrowed below the size of the microorganism, but the pressure loss will increase significantly, and fluid such as air and water will flow. Therefore, there is a need for a technique that has a higher pressure and a higher sterilization effect. In the present invention, since it has a sterilizing effect for electrically attracting microorganisms, it is not necessary to narrow the opening portion below the size of the microorganism, and the sterilizing effect can be exhibited up to the range where the electric field works. Can be obtained.

  The sterilizing solution can be obtained by mixing a solvent capable of swelling the substrate, a binder, and two or more kinds of metals having different oxidation-reduction potentials. At this time, a surfactant, a conductivity imparting agent, or the like may be added to the sterilization solution. When the prepared sterilizing solution is applied to the substrate, the solvent and the binder penetrate into the substrate, or the surface of the substrate is dissolved to form irregularities. The base material swells and increases in size due to the permeated solvent and binder, but the size decreases after the solvent is volatilized by ventilating and / or heating. Here, by selecting a solvent having volatility at a temperature of 200 ° C. or lower, thermal deterioration of the resin or fiber can be suppressed. Since it takes time to dry only by ventilating exhaust, and it tends to be deformed by non-uniform shrinkage due to a sudden change in substrate size only by heating, a method of heating after slowly drying the substrate by ventilating and drying is preferable.

  The sterilizing solution may be applied to the entire base material, or may be applied only to the outer surface of the base material. At this time, only the portion where the film is formed by applying the sterilizing solution exhibits the sterilizing effect. By coloring the sterilization solution, the portion where the effect is exhibited can be easily visually confirmed. Since visual recognition is easy, it is possible to easily confirm the occurrence of processing defects or scratches due to coating unevenness. In order to make the sterilization solution colored, for example, a black component such as carbon black or graphite, or a colored metal such as manganese, iron oxide, copper oxide, or an alloy thereof may be added at an arbitrary ratio. As a method for applying the sterilizing solution, a general method such as dipping, spraying, or brushing may be used.

The surface electrical resistance of the application part of the sterilizing solution is preferably 10 ⁷ Ω / □ or less. If the surface electric resistance is too high, an insulating film is formed, and the strength of the electric field is lowered, so that the sterilization action is lowered, which is not preferable. What is necessary is just to adjust to a use by adjusting the compounding quantity of a solid component, and the film thickness of a membrane | film | coat.

  Base materials include natural fibers such as cotton, rayon, nylon, wood, pulp, resin impregnated paper, polyester, polyurethane, polyether, polystyrene, polyolefin, epoxy, polycarbonate, polyamide, polyimide, and modified resins thereof. Synthetic fibers such as can be used. Metal or ceramic may be used.

  As the solvent, various solvents such as alcohols, linear hydrocarbons, aromatics such as toluene and xylene can be used. Specific examples include methanol, ethanol, propanol, methyl ethyl ketone, methyl butyl ketone, benzene, toluene, xylene styrene, ethyl benzene, cyclohexane, cyclohexanone, isophorone, hexane, heptane and the like, which can be used alone or in combination. A surfactant may be added to improve dispersibility. By selecting these solvents according to the material of the base material, the solvent penetrates into the base material or dissolves the surface of the base material to form irregularities. The base material swells and increases in size due to the permeated solvent, but the size decreases after the solvent is volatilized by ventilating and / or heating. Here, by selecting a solvent having volatility at a temperature of 200 ° C. or lower, the solvent can be removed at a low temperature, and thermal deterioration of the resin or fiber can be suppressed.

  Examples of the binder include nylon, polyester, polyether, acrylic, epoxy, epoxy ester, polyurethane, polycarbonate, melamine, vinyl, chlorinated rubber, silicone, fluorine, and other modified resins. The resin is desirably soluble in a solvent. Further, an inorganic binder may be used, and any one selected from colloidal silica, organosilica resin, silane coupling agent, titanium coupling agent, ethyl silicate, lithium silicate, potassium silicate, etc. is used. be able to.

  If the resin is blended so that the blending ratio with respect to the total solid content of the sterilizing solution is 7 wt% or more, sufficient adhesion between the base material and the binder and between the binder and the metal can be obtained. However, if it exceeds 35 wt%, although the adhesion and strength are good, the sterilization performance deteriorates because conduction between the metals and the conductivity-imparting agent is inhibited. The amount of resin relative to the total solid content of the sterilization solution may be arbitrarily selected within the range of 7 wt% or more depending on the balance of sterilization performance, adhesion, and strength. Moreover, if the resin can be dissolved or dispersed in a solvent, it is easy to adjust the viscosity of the sterilizing material, and it becomes easy to handle.

  Examples of the metal include Au, Pt, Ag, Cu, Pb, Ni, Sb, Co, W, Fe, Sn, Cr, Zn, V, Al, Ti, Zr, Mg, K, and alloys thereof. In particular, Ag, Cu, and Zn are preferable because the antibacterial property of the metal itself is strong. Fe, Zn, and Al are relatively inexpensive and easy to use. There are no particular restrictions on the choice of two or more metals, considering the application, lifespan, and economics, but the generation of hydrogen from the metal occurs near the electrolysis start voltage of water of 1.2 V, causing corrosion. Is not preferable because it is easy to proceed. Table 1 shows the electrode potential based on the metal type and the standard hydrogen electrode. For example, when the metal material is Fe, Zn can be selected as a metal having a higher ionization tendency than Fe, and the potential difference at that time is 0.32V. Other than the metals shown in Table 1, there is no particular problem as long as a potential difference occurs, and these alloys may be used. Zn is preferable because it has a relatively high ionization tendency and the antibacterial property of the metal itself is strong.

  Further, when two or more kinds of metals having different oxidation-reduction potentials come into contact with water in a state where a potential difference is generated, the metal having a lower oxidation-reduction potential is eluted into water. Here, since the metal having a higher oxidation-reduction potential is difficult to elute, it is better to increase the compounding ratio of the metal having a higher oxidation-reduction potential and a lower oxidation-reduction potential for long-term use.

  The metal particle size is desirably larger than the size of the microorganism to be removed. In order to collect microorganisms by the potential difference, at least the interval between the portions to which the potential is applied needs to be larger than the size of the microorganisms. Even when the particle size is small, it is considered that a potential is generated in a state where a plurality of particles are connected and spaced apart from each other, but it is expected that the potential is not high in terms of probability. In order to ensure a sufficient distance, it is preferably larger than 1 μm, which is the average microorganism size as a germ. When the shape is fibrous, the above-described conditions may be used in the length direction, not the thickness. Specifically, it is desirable that the metal particle diameter is 0.3 μm to 250 μm.

  If it is 250 μm or more, the metal settles in the sterilization solution, which causes a decrease in processability, and the contact area with the conductivity-imparting agent and other metal particles is reduced after the film is formed. This is not preferable because the sterilization efficiency decreases. On the other hand, if it is 0.3 μm or less, it is easy to be scattered as dust when preparing a sterilizing solution, and it is easy to get into the fine irregularities of the mixing container during mixing, so the workability is lowered. Further, it is not preferable because the metal is easily taken into the solid content of the binder and the sterilization effect is hardly exhibited.

  If the particle size ratio of two or more metals having different oxidation-reduction potentials is 1 to 8, high sterilization performance can be obtained because the contact efficiency with the conductivity imparting agent and other metal particles is good. Here, the particle size ratio of the metal is the length ratio of large particles / small particles.

  Examples of the conductivity-imparting agent include carbon materials such as graphite, carbon black, carbon fiber, fullerene, carbon nanotube, carbon nanohorn, carbon microcoil, carbon nanocoil, and conductive polymer having an unsaturated bond. Graphite and carbon black are the most commonly used conductive carbon materials and are highly economical. Moreover, what mixed resin emulsion and carbon as a conductive paint is marketed, and it can obtain easily. Carbon fibers, fullerenes, carbon nanotubes, carbon nanohorns, carbon microcoils, carbon nanocoils, etc. are often added to resins for the purpose of improving the strength of the resins, reducing their weight, and preventing electromagnetic waves. Thus, the sterilization effect of the present invention can be obtained. In addition, a conductive polymer that is being developed as an electrode can similarly obtain a sterilizing effect.

When the conductivity imparting agent is used, it is easy to mix if it is previously pulverized. Further, when a liquid in which a conductivity-imparting agent is dispersed is used, mixing is easier. You may use the commercially available conductive coating material with which resin and carbon were mixed previously. The conductivity-imparting agent is preferably 0.02 wt% or more in terms of the mixing ratio with respect to the total amount of metals. As a result, a potential difference is generated on the surface of the sterilization filter, and a higher electrical attraction effect can be obtained. Therefore, sufficient sterilization performance can be obtained. The surface electrical resistance of the substrate surface to which the sterilizing solution is applied is preferably 10 ⁷ Ω / □ or less. If the surface electrical resistance is too high, an insulating film is formed, and the strength of the electric field is lowered, and the sterilization action is lowered, which is not preferable.

  The metal and the conductivity-imparting agent are preferably fine powder and / or fibrous. In the case of powder, when the metal and the conductivity-imparting agent are dispersed in the binder, it is possible to obtain an effect of good dispersibility and easy processing. In addition, since it is easy to obtain a uniform state as compared with the fibrous form, there are advantages in appearance such as color unevenness and unevenness of the substrate surface. In the case of a fibrous form, when dispersed, the number of contact points between the fibers of the metal and the conductivity-imparting agent increases, and the number of places where a local potential difference occurs on the cured binder resin surface can be increased.

  As the shape of the substrate, any shape such as a fiber shape, a net shape, a bead shape, a slit shape, a straw shape, a plate shape, a honeycomb shape, a sponge shape, and a foam shape can be used. The sterilization performance is preferably a shape having a large surface area per unit volume, and a three-dimensional structure is good.

  As the three-dimensional structure, there are a shape in which fibers are entangled and a foamed shape. For example, in a shape in which fibers are entangled, steel wool, a three-dimensional three-dimensional knitted fabric composed of a front surface portion, a connecting portion, and a back surface portion, etc. Examples of the shape include foam metal, foam resin, and ceramic foam. For example, urethane foam resin has many air gaps inside, so that it has excellent air permeability and is inexpensive, flexible and easy to process. In the case of a sterilizing filter composed of a foam base material, a foaming density of 33 cells / 25 mm or less is suitable. If the opening is too narrow, the sterilizing solution is less likely to penetrate into the substrate, so the opening diameter of the opening is desirably 1 mm or more. Since the honeycomb shape is more excellent in water permeability and air permeability, it can be expected to be sterilized efficiently. Examples of the material include ceramics and metals.

(Embodiment 2)
FIG. 3 is an example of a sterilization apparatus 22 having a sterilization filter 21 created by applying a treatment liquid. The sterilization filter 21 is created by applying a sterilization liquid obtained by mixing two kinds of metals having different oxidation-reduction potentials, a binder, and a solvent to urethane foam as a base material. The sterilization filter 21 is disposed in a passage through which water and air flow, and forms a sterilization apparatus 22. Microorganisms contained in the bacterial solution 23 flowing from the upstream are collected by the action of the sterilization filter 21, and the microorganisms are removed and discharged downstream. Since the sterilization filter 21 has a sterilization action, microorganisms can be collected even at an opening larger than the size of the microorganisms, and a low-pressure loss filter can be obtained. When the sterilization filter has an antibacterial metal, the collected microorganisms can be sterilized on the spot, and generation of mold, slime and smell on the filter can be prevented.

  Further, by disposing the activated carbon filter 24 at the subsequent stage of the sterilizing filter 21, substances such as germs and molds can be collected by the sterilizing filter 21 at the preceding stage, so that germs and molds propagate on the activated carbon filter 24 at the subsequent stage. The effect of being difficult can be obtained. Further, the action of the activated carbon filter 24 can provide a decolorization and / or deodorization effect.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is limited to the following description and is not interpreted at all.

(1) A zinc powder having an average particle diameter of 50 μm as a metal and a commercially available conductive carbon coating material (conducting carbon and polyester resin dispersed in cyclohexanone as a solvent) and a weight ratio of zinc to carbon of 11 : The mixture was well kneaded at a ratio of 5 to make a paste, and a sterilizing solution was prepared. The prepared sterilization solution was spread on a resin plate molded into a circle having a diameter of 85 mm (about 57 cm ² ) and dried at 60 ° C. for 2 hours to prepare a sterilization plate A.

  (2) A copper powder of 75 to 150 μm as a metal and a commercially available conductive carbon coating (conducting carbon and polyester resin dispersed in cyclohexanone as a solvent) and a copper: carbon weight ratio of 11: The mixture was well kneaded at a ratio of 5 to make a paste, and a sterilizing solution was prepared. The prepared sterilization solution was spread on a resin plate and dried at 60 ° C. for 2 hours to prepare a sterilization plate B.

  (3) Zinc powder having an average particle diameter of 50 μm as metal, copper powder of 75 to 150 μm, and commercially available conductive carbon paint (conductive carbon and polyester resin dispersed in cyclohexanone as a solvent), The mixture was well kneaded at a ratio of zinc: copper: carbon of 10: 1: 5 to make a paste, and a sterilization solution was prepared. The prepared sterilization liquid was spread on a resin plate and dried at 60 ° C. for 2 hours to prepare a sterilization plate C.

  (4) A commercially available paint containing 96% zinc and 4% acrylic resin was spread on a resin plate and dried at 60 ° C. for 2 hours to prepare a comparative plate A.

  (5) A commercially available paint containing 83% zinc, 5% aluminum, and 12% acrylic resin was spread on a resin plate and dried at 60 ° C. for 2 hours to prepare a comparative plate B.

  (6) A comparative plate C was prepared without any processing.

  The resin plate prepared by the methods (1) to (6) was placed in a plastic petri dish so that the surface to which the sterilizing solution was applied faced up.

A bacterial solution was prepared by adding Escherichia coli (IFO 3972) to about 10 ⁵ (cfu / ml) in a normal bouillon medium diluted 400 times with purified water. 20 ml of each bacterial solution was placed in a plastic petri dish, and 0.1 ml of the solution was collected at regular intervals and cultured to compare changes in the number of bacteria. FIG. 4 shows the results obtained by dividing the number of bacteria after a predetermined time by the initial number of bacteria and normalizing the value as the residual ratio of the bacteria on the vertical axis and the elapsed time on the horizontal axis. In the sterilization plates A, B, and C, the number of bacteria decreased and it was found that the bacteria were sterilized. In the sterilization plates A and B, the sterilization rate was higher in A with Zn added. In the sterilization plate C to which copper and zinc were added, the decrease in the number of bacteria after 1 hour was particularly remarkable.

  A slight decrease in the number of bacteria was observed in the comparative plate A coated with a commercially available paint. In comparison plates B and C, the number of bacteria hardly changed, and it was found that the sterilization effect was not working.

  Table 2 shows the results of measuring the surface electrical resistance of the prepared sterilization plate and the comparison plate. It can be seen that the comparative plates A and B, which are commercially available paints, have a very high surface resistance and are not conductive. On the other hand, the sterilization plates A, B, and C have low surface resistance and conductivity. Compared with the results of FIG. 4, the sterilization plates A, B, and C having conductivity have sterilization performance, and the comparison plates A and B that have no conductivity and any treatment It was found that the comparative plate C that was not used had low sterilization performance.

The sterilization plate C prepared in Example 1 was placed on a slide glass and placed at a position that enters the field of view of the microscope. Escherichia coli (IFO 3972) is added to a normal bouillon medium diluted 400 times with purified water, and about 10 ⁶ cfu / ml of bacterial solution is placed on a slide glass so that it touches the sterilization plate C. 2 ml was dropped. As soon as observed with a microscope, E. coli was unevenly distributed at a specific position on the sterilization plate C and aggregated. The sterilization plate C was a mixture of zinc, copper and conductive carbon, and it was not possible to confirm in which position each material was applied. Compared to the size of E. coli (about 2 μm), the size of zinc and copper was sufficiently large (50 to 150 μm), and it was considered that the bacteria were probably agglomerated at a position where zinc was present at a high concentration.

  Zinc: copper: carbon containing zinc powder with an average particle diameter of 5 μm as metal, copper powder with 5 μm, and commercially available conductive carbon paint (conductive carbon and polyester resin dispersed in isophorone as a solvent). Was thoroughly kneaded at a ratio of 10: 1: 5 to make a paste, and a sterilizing solution was prepared. A foamed urethane with a foam density of 17 cells / 25 mm as a base material is immersed in the prepared sterilizing solution, and after excess liquid is removed, it is ventilated at room temperature for 30 minutes and sterilized by drying at 100 ° C. for 2 hours. A filter 21 was created. At this time, when the initial length of the urethane foam was 100%, the elongation was about 130% in the swollen state, and the elongation after drying was 115%.

  As shown in FIG. 3, the sterilization device 22 was created by arranging the sterilization filter 21 in the filter storage container and arranging the activated carbon filter 24 in the subsequent stage. The sterilization performance of the sterilization apparatus 22 was measured by flowing the bacterial solution 23 from the upstream side of the sterilization apparatus 22. The change in the number of bacteria was measured by collecting and culturing the bacterial solution 23 from the inlet / outlet of the sterilization apparatus 22 at regular intervals.

FIG. 5 shows the results when the filter was tested under the conditions of a cross-sectional area of 2.7 cm ² , a length of 5 cm, and a passage speed of the bacterial solution of 2.4 ml / min. The type of fungus is E. coli, and the upstream concentration is 10 ³ cfu / ml. The sterilization rate continuously showed a value of 80% or more, and showed a value that remained unchanged even after 40 hours from the start of the test. Since the sterilization performance can be controlled by changing the flow rate of the bacterial solution and the size of the filter, a device for sterilizing water can be obtained by designing the device according to the use conditions and the required performance.

In the method for producing a sterilizing filter according to the present invention, the solvent can be quickly volatilized by heat treatment for heating, and the binder resin can be polymerized and heat-cured . Therefore, it is possible to provide a sterilization filter that does not bury the components and does not cause peeling, and can be expected to be applied to a humidifier, an air conditioner, a water treatment device, and the like.

Schematic sectional view of a sterilization filter coated with the sterilization solution shown in Embodiment 1 of the present invention Schematic sectional view of a sterilization filter coated with the sterilization solution shown in Embodiment 1 of the present invention Schematic sectional view of the sterilization apparatus shown in Embodiment 2 of the present invention The graph which shows the relationship between the survival ratio of bacteria shown in Example 1 of this invention, and elapsed time The graph which shows the relationship between the bacteria elimination rate and elapsed time which are shown in Example 3 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Base material 12 Binder 13 Copper 14 Zinc 15 Conductivity imparting agent 16 Microorganism 21 Bacteria removal filter 22 Bacteria removal apparatus 23 Bacteria solution 24 Activated carbon filter

Claims (14)

A substrate having a water-passing property, the include a base material and a swellable solvent and a binder resin and two or more kinds of metals having different oxidation-reduction potential, the metal is a metal powder, the solvent and the binder resin 2 or more and the metal having different oxidation-reduction potential, the metal to each other by conducting a sterilization solution was applied obtained by mixing such an electric field is generated, before Kimotozai, the sterilization solution A method for producing a sterilizing filter, comprising: applying heat treatment to heat, volatilizing the solvent by the heat treatment, and polymerizing and thermosetting the binder resin. A substrate having a water-passing property, the include a base material and a swellable solvent and a binder resin and two or more kinds of metals having different oxidation-reduction potential, the metal is a metal powder, the solvent and the binder resin 2 or more and the metal having different oxidation-reduction potential, the metal to each other by conducting a sterilization solution was applied obtained by mixing such an electric field is generated, before Kimotozai, the sterilization solution After coating, exhaust treatment is performed to ventilate at normal temperature, heat treatment is further performed, and after drying while maintaining the shape of the substrate by the exhaust treatment, the solvent is volatilized by the heat treatment and A method for producing a sterilizing filter, comprising polymerizing and thermosetting a binder resin. Method for manufacturing a sterilization filter according to claim 1 or 2 mixing ratio to the total solid content of the sterilization solution is characterized that you blending a binder resin to less than 7 wt% or more 35 wt%. The method for producing a sterilizing filter according to claim 1 or 2 , wherein a conductivity imparting agent is added. The method for producing a sterilizing filter according to any one of claims 1 to 4 , wherein the solvent is volatile at a temperature of 200 ° C or lower. The method for producing a sterilizing filter according to any one of claims 1 to 5 , wherein the base material in contact with the sterilizing solution is swelled and then contracted. The method for producing a sterilizing filter according to any one of claims 1 to 6 , wherein the metal contains one or more selected from gold, silver, copper, zinc, aluminum, nickel, brass or an alloy thereof. . The method for producing a sterilizing filter according to any one of claims 1 to 7, wherein the metal has antibacterial properties. The method for producing a sterilizing filter according to any one of claims 1 to 8, wherein the particle diameter of the metal is 250 µm or less. The method for producing a sterilizing filter according to any one of claims 1 to 9, wherein the substrate has a three-dimensional structure. Method for manufacturing a sterilization filter according to any of claims 1 to 1 0, wherein the substrate is a foamed shape or three-dimensional fabric shapes. Method for manufacturing a sterilization filter according to any one of claims 1 to 1 1 the length of the opening diameter of the openings substrate has is equal to or is 1mm or more. A substrate having water permeability, comprising a swellable solvent, a binder resin, and two or more metals having different oxidation-reduction potentials, wherein the metal is a metal powder, and the solvent, the binder resin, and the oxidation-reduction potential. Applying a sterilizing solution obtained by mixing two or more different types of metals so that the metals are electrically connected to generate an electric field, and applying the sterilizing solution to the substrate. Then, a heat treatment is performed to heat, the solvent is volatilized by the heat treatment, the binder resin is polymerized and thermoset, and the metal is electrically connected to the surface of the base material to form a battery structure. Sanitization filter . A substrate having water permeability, comprising a swellable solvent, a binder resin, and two or more metals having different oxidation-reduction potentials, wherein the metal is a metal powder, and the solvent, the binder resin, and the oxidation-reduction potential. Applying a sterilizing solution obtained by mixing two or more different types of metals so that the metals are electrically connected to generate an electric field, and applying the sterilizing solution to the substrate. Then, exhaust treatment is performed to ventilate at normal temperature, heat treatment is further performed, and the substrate is dried while maintaining the shape of the substrate by the exhaust treatment, and then the solvent is volatilized by the heat treatment and the binder. A sterilization filter in which a battery structure is formed by conducting polymerization / thermosetting of a resin and allowing the metals to conduct on the surface of the substrate .

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