JP2006176376A - Porous fired material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a porous fired material wherein silver colloid is suitably deposited and to provide its manufacturing method. <P>SOLUTION: In the method for manufacturing the porous fired material wherein powdery coal and clay are kneaded, fired and crushed to a particle size of 1-5 μm, the porous fired material carrying silver colloid is obtained by spraying distilled water containing 100-200 ppm silver colloid having a size of 1-6 nm to the crushed porous fired material and stirring the material and drying the material at 60-120°C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a porous fired product made of charcoal such as bamboo charcoal or charcoal and having excellent functions such as deodorizing action, purification action, humidity control action, heat insulation action, and sound insulation action.

Charcoal such as bamboo charcoal and charcoal is a porous body having excellent functions such as deodorizing action, purification action, humidity control action, heat insulation action, sound insulation action, etc., and taking advantage of such excellent functions from the past, It has been used for various purposes.
However, charcoal is a black lump obtained by steaming and burning charcoal, and when used as a useful functional material, there are many restrictions in the range of use, for example, considering color and strength.

  In order to eliminate the above-mentioned restrictions, a porous fired product that is substantially white and can be colored and is easy to use has been proposed (for example, see Patent Document 1).

By the way, as in recent years, the degree of airtightness of the room increases in the living environment, and as a result, the humidity adjustment in the room is not sufficient, and the number of cases that live together with pets increases. Opportunities for infestation of microorganisms are increasing, and awareness of prevention from infections caused by such microorganisms is increasing. Also, environmental pollution on a global scale due to the proliferation of microorganisms in a ballast tank of a tanker, water tank, cool link power, and tanker is also an important problem.
Japanese Patent Laid-Open No. 2002-167287

On the other hand, it is known that silver is effective in antibacterial, deodorizing, deodorizing and the like. Therefore, it can be easily estimated that antibacterial, sterilizing, deodorizing and other effects can be exhibited according to the respective characteristics of the porous fired product and silver.
However, as is well known, the above-mentioned effect is often proportional to the surface area, and the application example is limited even if only silver grains are used. Further, the characteristics of the porous fired product are not sufficiently exhibited due to the size of the silver grains.

  In addition, nano-sized colloidal silver is known to have antibacterial, anti-mite, anti-static, and deodorizing effects, as well as having an antibacterial effect several tens of times that of antibiotics. Yes. Although such colloidal silver (hereinafter referred to as silver colloid) is extremely effective, its handling is limited because it is in liquid form.

Accordingly, an object of the present invention is to provide a porous fired product suitably carrying a silver colloid and a method for producing the same.
Another object of the present invention is to improve the antibacterial properties, deodorization, purification, humidity control, heat insulation, sound insulation, mite prevention, antistatic and the like possessed by the porous fired product and the silver colloid.
Another object of the present invention is a silver-containing porous fired product having a large surface area, a small volume, and a performance exceeding the antibacterial action and the like while being a mixture of silver and charcoal, and a method for producing the same Is to provide.

Further, a porous fired product excellent in deodorizing action, humidity adjusting action, heat insulating action, and sound absorbing action has been proposed (see Patent Document 1).
In addition, colloidal silver with a nano-sized particle size has tens of times the antibacterial and bactericidal power of antibiotics, as well as deodorizing, anti-mite, anti-static, and deodorizing effects. Has been known, and has been particularly focused on its antibacterial effects.
And, by fixing the silver colloid to the porous fired product, that is, by supporting the silver colloid in the pores of the porous fired product, deodorizing action, purification action, humidity control action, heat insulation action, sound insulation action, fire prevention In addition to its action and white ant preventive action, it has been found to be accompanied by high antibacterial and antiviral effects such as antivirus.

  According to the present invention, 70 to 90 parts by weight of powdered charcoal and 10 to 30 parts by weight of clay are kneaded, and the kneaded product is molded and fired and pulverized into a porous fired product having a particle size of 1 to 5 μm. 1 to 6 nm of silver colloid is supported.

  Further, according to the present invention, in the method for producing a porous calcined product, which is kneaded and pulverized as powdered charcoal and clay and pulverized to a particle size of 1 to 5 μm, a 1 to 6 nm silver colloid is applied to the pulverized porous calcined product. Is distilled and stirred at a temperature of 60 to 120 ° C. to obtain a porous fired product carrying a silver colloid.

  Furthermore, according to the present invention, in the method for producing a porous fired product obtained by kneading and firing powdered charcoal and clay and pulverizing to a particle size of 1 to 5 μm, the pulverized porous fired product is dropped from the curtain flow rotor. In the meantime, distilled water having 100 to 200 ppm of silver colloid of 1 to 6 nm is sprayed and dried to obtain a porous material carrying the silver colloid.

  In carrying out the present invention, it is preferable to use the porous fired product described in Patent Document 1. This porous fired product is substantially white and can be colored for that purpose. For example, it is suitable for coating a wall or the like by being mixed in a paint. Moreover, since it is a powder, it can be easily woven into a fiber and can be applied to a white coat, a mask, clothes, a filter, and the like.

  The porous fired product as the starting material of the present invention has a particle size of about 1 to 5 μm as described above, and a number of pores of about 7 nm are formed on the surface, and a silver colloid of about 1 to 6 nm is formed in the pores. Are carried in large numbers.

The silver colloid carried out in the present invention is preferably a silver solution having a trade name of “Silbarrier” and containing 200 trillion silver colloids having an average of 4 nm (nanometer) per 1 cc. This is diluted 500-2000 times with distilled water and used.
In carrying out the present invention, it is preferable to use air at 60 to 120 ° C. for the drying operation.

  If there is too much silver colloid, the entire surface of the porous fired product will be covered, and the effect of the porous fired product will be reduced. If there is too little silver colloid, the effect of silver will be low. Therefore, the amount of silver colloid is adjusted as described above.

  Since the porous fired product according to the present invention has silver colloid supported in the pores, the appearance is not different from the porous fired product, and the action of antibacterial and the like is remarkably improved.

The porous fired material, which is a dough, has an enormous surface area, and has a high antibacterial action, deodorizing action, purification action, humidity control action, heat insulation action, sound insulation action, and the like. In addition, a silver colloid having a high antibacterial action is fixed inside the pores of the porous fired material.
Therefore, as a whole, it has a high deodorizing action, a purifying action, a humidity control action, a heat insulating action, a sound insulating action, and a stronger antimicrobial action such as antibacterial / antiviral action.

  As shown in FIGS. 6 to 9 to be described later, the bactericidal action is extremely excellent, and in addition to the advantages of the porous fired product, it has a superior antimicrobial action.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, in FIG. 1, a porous fired product M according to an embodiment of the present invention is in a silver colloid solution 2 (described later with reference to FIG. 4) prepared in advance in a porous portion 12 of a porous fired material 1 that is a dough. The silver colloid 20 is adhered, and the silver colloid 20 is dried and fixed.
Reference numeral 11 in FIG. 1 indicates an outer surface (surface).

FIG. 1 schematically shows a state in which an appropriate amount of colloidal silver 20 is fixed to the porous portion 12 of the porous fired material 1 that is a dough. FIG. 2 shows the surface 11 of the porous fired material 1 and the porosity. A larger amount of colloidal silver 20 than necessary is deposited in 12 so as to block many portions of the surface.
In the case of FIG. 2, the purification function, the humidity control function, the heat insulation function, and the sound insulation function, which are effective functions (performance) of the folded fabric, are contained, and only the silver ion performance by the silver colloid 20 is exhibited.
According to the experimental results, the porous fired material containing the silver colloid 20 more than necessary hardly exhibits the adsorption performance and antistatic effect of VOC, which is a harmful volatile component such as formaldehyde. This is presumably because the silver ions of the silver colloid 20 covered the pores and the surface of the porous fired material.

  That is, it is desirable that the porous calcined material 1 and the silver colloid 20 are bonded in a well-balanced manner, and the amount of the silver colloid (silver ion) 20 is preferably such that it does not fill the pores (porous) 12 of the porous calcined material 1.

Next, based on the flowchart of FIG. 3, the manufacturing method (manufacturing process) of the porous fired product M will be sequentially described with reference to FIG.
FIG. 4 omits steps from the kneading step (S1) to the porous baking material creation step (S3) in the flowchart of FIG. 3 to change the silver colloid liquid (2) creation step (S4) to the silver colloid (20). It is process drawing which showed the Example of the process until it dries and adheres to the porous (hole 12) of porous calcination material (1) with a drying means (6).

  First, in the “kneading step” of step S1, powdered charcoal and clay are kneaded. The weight ratio of powdered charcoal and clay at this time is 10 to 30 parts by weight of clay with respect to 70 to 90 parts by weight of powdered charcoal.

  In the “baking process” of the next step S2, the kneaded material kneaded in step S1 is baked at 600 ° C. or higher, for example, in a dedicated baking furnace or the like, and is baked in the “porous baking material preparation process” of step S3. The fired product is pulverized into a predetermined size, that is, a particle size of 0.01 to 0.5 mm (200 mesh to 500 mesh) to prepare a porous fired material 1.

  As the porous fired material 1, for example, it is preferable to use the porous fired product of Patent Document 1 described in the related art.

In the next step S4, “Silver colloid solution preparation process”, as shown in 4-1 of FIG. 4, 2A of silver colloid stock solution (silver solution; stock solution concentration is 100,000 ppm) and purified water (pure water) Water) 2B is prepared, the silver colloid stock solution 2A is diluted 100 to 1000 times with purified water 2B, and a silver colloid solution 2 diluted to have 2 trillion to 200 billion silver colloids 20 in 1 ml is prepared.
As shown by 4-2 in FIG. 4, the diluted silver colloidal solution 2 is filled in, for example, a spray 3 which is a coating means.
The size of the silver colloid is in the range of 1 to 10 nm (nanometer), and 4 nm is particularly desirable.

In the next “step of applying and attaching silver colloidal porous fired material into the pores” in step S5, as shown in 4-3 of FIG. 4, the porous fired material 1 is placed in the stirring tank 5 having the stirrer 4. The colloidal silver liquid 2 filled in the spray 3 is sprayed onto the porous fired material 1 being stirred while the stirrer 4 is rotated.
Then, the silver colloid liquid 2 enters into the pores (pores) 12 of the porous fired material 1, and the silver colloid 20 in the silver colloid liquid 2 adheres to the inner surface of the pores 12.

  In the “silver colloid fixing step” in step S6, as shown in 4-4 of FIG. 4, for example, the porous fired material 1 covered with the silver colloid solution 2 in the stirring tank 5 by the UV (ultraviolet) dryer 6 is applied. The liquid portion of the silver colloid liquid 2 is dried, and the silver colloid 20 in the silver colloid solution 2 is dried and fixed in the pores (pores) 12.

  In the cooling process of the next step S7, the porous fired material 1 to which the silver colloid 20 in the stirring tank 5 is fixed is naturally cooled to complete the target porous fired product M.

  Next, a modification (manufacturing method) different from the embodiment of FIG. 4 will be described with reference to FIG.

  The modification of FIG. 5 differs from the embodiment of FIG. That is, in the pulverization step S3, the fired fired product 1B is pulverized into the porous fired material 1 having a predetermined particle diameter, for example, in the pulverization mechanism 7.

A curtain flow coater 9 is connected to the pulverizing mechanism 7 via a supply pipe 8, and the porous material 1 formed by pulverizing the fired product 1 </ b> B is sprayed while falling from the curtain flow coater 9. The silver colloid liquid 2 is sprayed by 3, and at the same time, the liquid portion of the silver colloid is dried and removed by the UV dryer 6.
Then, the silver colloid 20 in the silver colloid liquid 2 is supported and fixed in the porous 12 of the porous fired material 1.

  In addition, although not shown, as a method of drying the porous detailed material 1 after spraying the silver colloid liquid 2, for example, a method of drying with a UV dryer 6 while the porous fired material 1 is being flowed on a belt conveyor, or There is also a method of drying while winding the porous fired material 1 with a warm air heater.

FIG. 6 shows the change in the number of viable bacteria at the start of the test bacteria (E. coli, Legionella, Salmonella) when the sterilization test is performed with the porous fired product M according to the embodiment of the present invention and after 24 hours. It is the figure put together in the table.
As a test method, the porous baked product (silver-containing charcoal system) is prepared so that a bacterial solution of three target bacterial species (E. coli, Legionella, Salmonella) is prepared, and the weight ratio thereof is 10% (10 wt%). Porous fired product) M is charged and stored at 25 ° C., and the number of viable bacteria is measured after 24 hours.
As a comparison target (control), data was also collected for a test solution containing the same weight ratio of a material obtained by subjecting an alumina ceramic to silver colloid antibacterial treatment.

  FIGS. 7 to 9 show the time course (change) of the number of viable bacteria from the start of the test for Escherichia coli (O157), Legionella, and Salmonella in the order of the figures. (Graph).

  6 and 7, according to the porous fired product M of the embodiment of the present invention, the number of viable bacteria that was 210,000 at the start of the sterilization test was the detection limit after 24 hours. It has decreased to the following. On the other hand, about 50 bacteria are alive in the alumina ceramic as a comparative control.

  According to FIG.6 and FIG.8, the viable count which was 120,000 Legionella bacteria at the time of the start has decreased to 150 after 24 hours. On the other hand, about 11,000 bacteria survive in the comparative alumina ceramics.

  According to FIG.6 and FIG.9, the viable count which was 680,000 Salmonella at the time of the start has decreased to below the detection limit after 24 hours. On the other hand, about 21,000 bacteria survive in the alumina ceramics as a comparative control.

The above-described porous fired product M of the present invention uses powdered charcoal and clay as raw materials, and a silver colloid (silver ion) 20 is fixed inside the pores (pores) 12 of the porous fired material 1 as a base material. In addition, the porous fired material 1 that is a dough has an enormous surface area, and itself has a high purification action, humidity conditioning action, heat insulation action, and sound absorption action.
In addition, the silver colloid 20 fixed in the porous 12 of the porous fired material 1 has a high antibacterial and bactericidal action.
Accordingly, the porous fired product M of the present invention as a whole has a high purification action, humidity control action, heat insulation action, sound absorption action, and antibacterial / bactericidal action.

  If the material similar to the above-mentioned patent document 1 is chosen for the porous baking material 1 which is cloth | dough, since a base is white and it can color in another color, it can be used for many uses.

  Here, specific uses of the porous fired product M of the present invention include various medical supplies, building interior materials, indoor furniture, water storage tanks, cooling power, paints for ballast tanks of warehouses and tankers, and water purification. Antibacterial filters for home use, air conditioner filters, household sundries (toothbrushes, tableware), toys, bedding, etc.

A silver-containing porous fired product having a mesh size of 200 mesh to 500 mesh or more according to an embodiment of the present invention is prepared with Gohsenol (trade name: manufactured by Nippon Gosei Co., Ltd.) and water at a weight ratio of about 7: 10: 2, respectively. An antiseptic was added to create a paint. Two drops of this were dropped on an aluminum foil with a dropper and dried, and a disk was prepared so that the individual weight was 0.04 g (error range 0.002 g). Using this, the antibacterial effect against acid-fast bacteria (M. kansaii) resident in the drains of bathrooms was examined. As a result, the bacteria concentration was 8-8 × 10 ³ cells / ml compared to the blank. The sterilization effect was confirmed.
Further creating a side 3cm chip polyethylene plate, the coating material to create a material obtained by coating, was examined the effect with respect to measles virus, in 1-10 ⁴ cells / ml virus concentration, the antiviral effect was confirmed It was.
Blank disc
OD OD
8 × 10 ³ 0.498 Growth 0.018 Non-growth 8 × 10 ² 0.243 Growth 0.001 Non-growth 8 × 10 ¹ 0.299 Growth 0.011 Non-growth 8 × 10 ⁰ 0.242 Growth 0.011 Non-growth

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

  Since the porous fired product according to the present invention is a white powder, it can be applied to a wall by being put in a paint, or can be freely applied to various types as described above, and can be used in a wide variety of industries.

The schematic diagram which shows the state by which the appropriate amount of silver colloids adhered to the inside of the porous baked material in the porous baked product of the embodiment of the present invention. The schematic diagram which shows the state which excessive silver colloid more than the appropriate amount fixed to the surface and porous of a porous baking material. The flowchart which showed the manufacturing method (manufacturing process) of the porous baked product regarding embodiment of this invention. The manufacturing process figure which showed the manufacturing process of the porous baked product regarding embodiment of this invention. The manufacturing process figure which showed the manufacturing process of the porous baked product partially different from FIG. 4 regarding embodiment of this invention. It is the figure which put together the test data when performing a sterilization test with the porous baked material of embodiment of this invention. The test data which described the time course of the viable cell count from the time of the test start of colon_bacillus | E._coli (O157) at the time of performing a bactericidal test with the porous baked product of embodiment of this invention to 24 hours later. The test data which described the time course of the viable cell count from the time of the test start of Legionella bacteria at the time of performing a sterilization test by the porous baked material of embodiment of this invention to 24 hours later. The test data which recorded the time course of the viable count from the time of the test start of Salmonella when the sterilization test was performed with the porous baked product of the embodiment of the present invention to 24 hours later.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Porous baking material 2 ... Silver colloid liquid 2A ... Silver colloid liquid undiluted solution 2B ... Purified water 3 ... Coating means / spray 4 ... Stirrer 5 ... Stirrer tank 6 ... UV dryer 7 ... Crushing mechanism
8 ... Supply pipe 9 ... Curtain flow coater 11 ... Surface 12 ... Porous (hole)

Claims (3)

  70 to 90 parts by weight of powdered charcoal and 10 to 30 parts by weight of clay, kneaded and pulverized by kneading and kneading the kneaded product, and then a 1 to 6 nm silver colloid in the pore Is a porous fired product.   In a method for producing a porous calcined product, which is kneaded and calcined as powdered charcoal and clay and pulverized to a particle size of 1 to 5 μm, distilled water having 100 to 200 ppm of silver colloid of 1 to 6 nm in the pulverized porous calcined product A method for producing a porous calcined product, characterized in that a porous calcined product carrying silver colloid is obtained by spraying and stirring and drying at 60 to 120 ° C.   In the method for producing a porous calcined product obtained by kneading powdered charcoal and clay, calcining and pulverizing to a particle size of 1 to 5 μm, the pulverized porous calcined product is dropped from the curtain flow rotor, and 1 to 6 nm therebetween. A method for producing a porous fired product, characterized in that a porous material carrying silver colloid is obtained by spraying and drying distilled water containing 100 to 200 ppm of silver colloid.

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