JP2008253895A - Silver-carrying porous ceramic for spraying silver ion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silver-carrying porous ceramic for spraying silver ions which is not broken even when used in water and can stably generate silver ions over a long period because it has high strength and water resistance. <P>SOLUTION: The silver-carrying porous ceramic for spraying silver ions carries fine silver particles in its internal pores. An organic antibacterial and antifungal agent may be carried in the internal pores. The surface of the silver-carrying porous ceramic may be covered with an inorganic coating layer containing silver particles and/or ultrafine silver particles derived from alkoxy silver. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention can easily perform sterilization, antibacterial and deodorization in a living environment such as home and workplace, and in particular, a silver support for a silver ion spray capable of generating silver ion water having a stable concentration over a long period of time. The present invention relates to a ceramic porous body.

  In a living environment such as a home or workplace, there are many places that are likely to be unsanitary, such as kitchens, bathrooms, toilets, pet breeding, trash cans, clogs, etc., and such places also cause bad odors. Conventionally, a means for deodorizing by the aroma of the deodorant has been taken. However, the deodorant has no functions of sterilization and antibacterial, and it has been difficult to mechanically deodorize and sterilize a wide range of UV irradiation used in toilets and the like. Therefore, a simpler means having both functions of deodorization and sterilization is desired.

  Silver ions are attracting attention because they are harmless to the human body and have sterilizing, antibacterial, and deodorizing effects. The disinfectant composition of Patent Document 1 is a mixture of an Ag (II) complex and tetrasodium borate, and is used for surgical cleaning soaps and the like.

  Further, the antibacterial activated carbon of Patent Document 2 is one in which a silver-added inorganic antibacterial agent is fixed to the outer peripheral surface of the activated carbon through a microporous silica gel, and can prevent generation of trihalomethane in water passing therethrough.

  In the Ag alloy-coated activated carbon of Patent Document 3, an alloy composed of Ag, Cu and Zn is coated on the surface of the activated carbon by sputtering, and distilled water in the water purifier can be sterilized over a long period of time.

  Further, the antifungal and antibacterial agents of Patent Document 4 include an amorphous synthetic aluminum silicate compound containing at least one of Ag, Cu and Zn as an essential ingredient as an active ingredient, drinking water, 24-hour bath, pool water It sterilizes by circulating etc. here.

  Furthermore, the sustained-release antibacterial material of Patent Document 5 describes an antibacterial spray using a silver-based antibacterial agent in which a silver complex is supported on a silica gel carrier, a sustained-release antibacterial material composed of silica gel and an organic binder. .

Japanese Patent Publication No. 6-511189 JP-A-6-287103 Japanese Patent Laid-Open No. 10-477 JP 2000-63219 A Japanese Patent No. 3460008

  All of the antibacterial agents described in Patent Documents 1 to 4 cannot withstand long-term use such as one year or longer because silver is supported on a carrier having low mechanical strength.

  Also, the antibacterial material described in Patent Document 5 is a tablet produced by compressing a commercially available silver-based antibacterial agent, a polyethylene fine particle and a silica gel mixture, so that it has a low mechanical strength and cannot withstand long-term use. is there.

  Since the present invention has high strength and water resistance, it does not collapse even when used in water, and can stably generate silver ions over a long period of time. The purpose is to provide.

  The silver-supporting ceramic porous body for silver ion spray of the present invention is characterized in that silver fine particles are supported in the internal pores of the ceramic porous body. The internal pores may further carry an organic antibacterial and antifungal agent.

  In the silver-supported ceramic porous body for silver ion spray of the present invention, the surface of the silver-supported ceramic porous body is covered with an inorganic coating layer containing silver particles and / or silver ultrafine particles derived from alkoxy silver. It is preferable.

  Since the silver-supporting ceramic porous body for silver ion spray of the present invention has a ceramic base and has high strength and water resistance, it does not collapse even when used in water. Further, since silver ions can be stably generated over a long period of time, it is optimal for silver ion spraying.

  By further supporting an organic antibacterial and antifungal agent in the internal pores of the ceramic porous body, or by forming an inorganic coating layer containing silver particles and / or silver ultrafine particles derived from alkoxy silver on the porous body surface It can enhance sterilization, antibacterial and deodorizing functions.

  The ceramic porous body according to the present invention has silver fine particles supported on a porous body having a large amount of internal pores obtained by firing a raw material mineral such as clay. Such a ceramic porous body has internal pores after firing, and if it has excellent heat resistance, water resistance, and corrosion resistance, the shape and size are not particularly limited and can be appropriately selected according to the application. Examples of the shape include a sphere, a quadrangle, a cylinder, and a column.

  Examples of the raw materials include calcined clay such as Kibushi clay, Sasame clay, porcelain earth, semi-porcelain earth, etc., porous silica, porous aluminum, porous calcium silicate, talc, kaolin, diatomaceous earth, Perlite, a substance that forms a card house, or an intercalation compound can also be used. Specific examples thereof include bentonite, activated bentonite, sodium bentonite, montmorillonite, acid-treated montmorillonite, activated clay, synthetic stiffening, synthetic amicite, synthetic fly-pontite, smectite, hectite, laponite, bedelite, nontrolite, Examples thereof include saponite, vermiculite, and sepiolite.

  Silver fine particles are supported on the internal pores of the ceramic porous body. Although this means is not limited, for example, a ceramic porous body is impregnated with an aqueous silver salt solution, dried, and then heated to a temperature higher than the decomposition temperature of the silver salt to precipitate ultrafine silver in the internal pores. Can do. The heating temperature must be equal to or higher than the silver salt decomposition temperature. For example, in the case of silver nitrate, the decomposition temperature is 444 ° C. or higher.

  The silver-carrying ceramic porous body manufactured in this way has the form shown in the schematic diagram of FIG. In this figure, the ceramic porous body 1 has internal pores 3 formed between ceramic aggregates 2, and silver fine particles 4 are supported on the walls of the ceramic aggregate 2 forming the internal pores 3. ing.

  By carrying the organic antibacterial and antifungal agent together with silver in the ceramic porous body of the present invention within a range that does not harm the environment, it is possible to complement the sterilization, antibacterial and deodorizing functions of silver ions. Such antibacterial and antifungal substances include those having a bactericidal action and those having a bacteriostatic action. Specific examples of antibacterial and antifungal substances include 5-chloro-2-methyl-4-isothialyson-3-one, 2-methyl-4-isothialyson-3-one, and 1,2-benzisothiazolin-3-one. 2-n-octyl-4-isothiazolin-3-one, 2- (4-thiazolyl) -benzimidazole, antibiotics, etc., humulon, lupulon, allicin, allyl isothiocyanate , Chlorogenic acid, solanine, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, tangeritin, berberine, hinokitiol, protamine, methylparaben, ethylparaben, propylparaben, vanillin, cinnamic aldehyde, p − Droxybenzoate, d-limonene, camphor, phenyl oxide, p-dichlorobenzene, dimethyl fumarate, hiba oil, asunaro oil, taiwan cypress oil, cassia oil, dill oil, lemon oil, citronella oil, clove oil, thyme oil , Linalool, trans-pinocarveol, p-isopropylcyclohexanol, camphorenic aldehyde, γ-decalactone, γ-undecalactone, phenol, benzalkonium chloride, chlorhexidine, alkyldiamide ethylglycine hydrochloride, glutaraldehyde, glucone Acid chlorhexidine, thiabendazole, 2,4,5,6-tetrachloroisophthalonitrile, benzimidazole compounds, organic iodine compounds, organic nitrogen sulfur compounds , Aminometal silver (manufactured by Nikko Co., Ltd.), and aminoglycoside antibiotics include o- [2,6-diamino-2,6-dideoxy-α-D-glucopyranosyl (1 → 4)] 1,3- Diamino-4,5,6-trihydroxycyclohexane (hereinafter referred to as “ST-7”), 1- [2- (4-chlorobenzyloxy) -2- (2-chlorophenyl) -ethyl] imidazole (hereinafter referred to as “ST -5 ”)), o- [2,6-diamino-2,6-dideoxy-α-D-glucopyranosyl (1 → 4)] 1,3-diamino-4,5,6-trihydroxycyclohexane and terephthalate Schiff base-formation typified by polymer of aldehyde (hereinafter referred to as “ST-8”), o- [2,6-diamino-2,6-dideoxy-α-D-glucopyranosyl (1 → 4)] 1 , 3 Diamino-4,5,6-Schiff base formation with trihydroxycyclohexane and p- methoxybenzaldehyde (hereinafter referred to as "ST-9." ).

  FIG. 2 shows a schematic diagram of a ceramic porous body carrying an organic antibacterial and antifungal agent and silver. In the internal pore 3, an organic antibacterial and antifungal agent 5 is supported along with ultrafine silver particles 4.

  The silver-carrying ceramic porous body of the present invention can enhance the sterilization, antibacterial and deodorizing functions by providing an inorganic coating layer containing silver on the surface thereof. Specifically, a hydrated metal oxide containing ultrafine silver particles and / or coarse silver particles derived from alkoxy silver in a silver-supported ceramic porous material or a silver and organic antibacterial / antifungal agent-supported ceramic porous material. Form a coating.

  The base hydrated metal oxide is silica, alumina, zirconia, titanium oxide, barium oxide, iron oxide, or silver, preferably silica or alumina. This hydrated metal oxide film is preferably formed almost uniformly on the surface of the ceramic porous body, but at least 30% or more, more than 80% of the surface of the ceramic porous body is coated. It should be.

  The means for forming the hydrated metal oxide film on the surface of the ceramic porous body is not particularly limited, but typical examples thereof are as follows. That is, the ceramic porous body is put into an alkoxy metal compound or an alcohol solution thereof and stirred with a stirrer such as an ultrasonic disperser or a high-speed stirrer to form a uniform dispersion, to which water and a hydrolysis catalyst are added. Then, the alkoxy metal compound is hydrolyzed and condensed to deposit a hydrated metal oxide on the pigment surface.

Examples of the alkoxy metal compound in this method include those represented by the general formula M (OR) _n (where M is a metal element, R is an alkyl group, and n is a formula weight). M is preferably Si, Al, Zr, Ba, Ti, Ag or the like. R is usually an alkyl group having 1 to 8 carbon atoms, and particularly preferably an alkyl group having 1 to 6 carbon atoms.

When the inorganic coating layer is formed of silica fine particles, silica alkoxide can be used as a raw material. Silica alkoxide is
General formula (I): Si (OR) ₄
(Wherein R represents an alkyl group having 1 to 6 carbon atoms)
It is a compound represented by these. The alkyl group having 1 to 6 carbon atoms represented by R may be linear or branched, and is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl. , N-pentyl, n-hexyl and the like. Of these, alkyl having 1 to 4 carbon atoms such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl and the like are preferable. More preferably, R is ethyl, n-propyl, isopropyl, or n-butyl. Particularly preferably, R is ethyl, isopropyl or n-butyl. As the raw material silica alkoxide, a commercially available one can be used, or it can be produced by a known method.

    The flow of hydrolysis / condensation when silica alkoxide (I) is used is shown by general formulas (II) and (III).

  In the case of forming a coating layer of high-purity silica fine particles, it is preferable to use silica alkoxide having a purity of 95% or more, more preferably 97% or more, and further preferably 99% or more.

  In the case of using silver ultrafine particles derived from alkoxy silver for silver particles to be included in the inorganic coating layer, silver ultrafine particles are contained by using a hydrated metal oxide in which the metal Si portion of the silica is replaced with Ag. An inorganic coating layer can be formed. Moreover, an inorganic coating layer containing silver particles can be formed by adding silver particles (coarse particles) to the hydrated metal oxide serving as the base, followed by hydrolysis and condensation. As silver particles to be used, a commercially available silver powder having a particle size of 1 mm or less, and optimally 1 to 200 μm is preferable. In addition, zinc particles can be used in combination with silver particles or silver ultrafine particles.

  FIG. 3A is a schematic diagram of a silver-supporting ceramic porous body having an inorganic coating layer, and FIG. 3B is a ceramic porous body supporting an organic antibacterial and antifungal agent having an inorganic coating layer and silver. The schematic diagram of is shown. In these drawings (a) and (b), ultrafine silver particles 6 derived from alkoxy silver, coarse silver particles 7 and zinc oxide fine particles 8 are distributed on the surface of the ceramic porous body 1 by the silica coating 9.

Since the silver-supported ceramic porous body of the present invention has high strength and water resistance, it does not collapse even when used in water. Further, since silver ions can be stably generated over a long period of time, it is optimal for silver ion spraying.
In the silver ion spray, the silver-carrying ceramic porous body of the present invention is placed in a spray container, water (and / or ethanol) is added thereto to elute silver ions in the water, and the silver ion-containing water is treated with antibacterial water and water. It is used as odorous water around kitchens, bathrooms, toilets, and other places. Since the silver-supported ceramic porous body of the present invention can stably generate silver ions over a long period of time, it can be used while adding water. Can be used.

(Example)
The following examples are provided to further illustrate the present invention.
Example 1 (Production of silver fine particle supported ceramic porous body)
The mixture was granulated into a spherical shape with water using a clay. The granulated product was fired at 1000 ° C. to obtain a ceramic porous body having a diameter of about 15 mm. Next, 140 g (63 in number) of this ceramic porous body was impregnated with 28 g of a 10% silver nitrate aqueous solution and fired at 700 ° C. for 3 hours in an electric furnace to produce a silver fine particle-supported ceramic porous body.
The amount of silver fine particles carried per ceramic porous body obtained was 6.35 mg.

Example 2 (Manufacture of ceramic porous body supporting silver fine particles and organic antibacterial and antifungal agent)
The silver fine particle-supported ceramic porous body obtained in Example 1 was impregnated with 20 g of a 75% acetone solution of 2,4,4′-trichloro-2′-hydroxydiphenyl ether and dried at 100 ° C. for 24 hours. Thus, a ceramic porous body carrying an organic antibacterial and antifungal agent and silver fine particles was produced.

Example 3 (Silver fine particle-supported ceramic porous body on which an inorganic coating layer is formed)>
A dispersion prepared by previously mixing 8 g of a mixture of silica ethoxide and silver methoxide (mass ratio = 95: 5), 2 g of 325 mesh pass silver particles and 0.2 g of zinc particles was prepared by stirring and mixing. Next, the above dispersion was coated on the silver fine particle-supporting ceramic porous body obtained in Example 1 with a coating apparatus. And it dried at 100 degreeC for 24 hours, and was formed into a film.
The amount of silver contained in the inorganic coating layer was 59.97 mg per obtained ceramic porous body. Therefore, the total amount of silver contained in one ceramic porous body is about 66 mg when the amount of silver supported on the internal pores of the porous body is 6.35 mg.

Example 4 (silver fine particles having an inorganic coating layer formed thereon and an organic antibacterial / antifungal agent-supporting ceramic porous body)
A ceramic porous body carrying silver fine particles and an organic antibacterial / antifungal agent was produced under the same conditions as in Example 3 except that the silver fine particle carrying ceramic porous body obtained in Example 2 was used.

<Evaluation>
The antibacterial and deodorizing tests were conducted using the ceramic porous body (hereinafter referred to as “silver ion ball”) having a total silver amount of about 66 mg / piece produced in Example 3.

1. Antibacterial test conducted by the Kyoto Microbiological Research Institute. Each silver ion ball (3 samples) was immersed in 300 ml of water containing Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Salmonella for 3 hours. Was observed. The results are shown in Table 1.
When the silver ion ball of the present invention was used, all the bacteria disappeared (<10 means no detection).

2. Antibacterial and deodorization test by the Japan Spinning Inspection Association Using Staphylococcus aureus, the test was conducted based on the JIS L1902 quantitative test (bacterial fluid absorption method). The method for measuring the viable cell count was based on the pour plate culture method.
One sample (silver ion ball) was put into 300 ml of ion exchange water at 25 ° C. and stirred for 3 hours to prepare a sample solution. An appropriate amount of the prepared sample liquid was sprayed on 0.4 g of standard cotton cloth and dried, and this was used as a test sample. “Unprocessed” is obtained by spraying an appropriate amount of ion-exchanged water onto a 0.4 g standard cotton cloth and drying it. The results are shown in Table 3. In addition, Table 2 is the data which investigated the number of bacteria of the unprocessed cloth as preparation before a test.
When the silver ion ball of the present invention is used, it is clear that the foundation meets the standard value of the antibacterial and deodorizing effect of the foundation.

logＢ−logＡ＝2.6 ＞1.5……試験成立
殺菌活性値 ＝logＡ−logＣ
静菌活性値 ＝logＢ−logＣ

logB-logA = 2.6> 1.5 …… Test completed
Bactericidal activity value = logA-logC
Bacteriostatic activity value = log B-log C

社団法人繊維評価技術協議会の抗菌防臭効果の基準 静菌活性値≧２．２
銀イオンボールによる加工処理品 合格
未加工品 不合格
社団法人繊維評価技術協議会の制菌加工（一般用途）の基準 殺菌活性値≧０
銀イオンボールによる加工処理品 合格
未加工品 不合格

Criteria for antibacterial and deodorant effects of the Japan Fiber Evaluation Technology Council Bacteriostatic activity value ≧ 2.2
Processing product with silver ion ball passed
Unprocessed product Refusal Criteria for antibacterial processing (general use) of the Japan Textile Evaluation Technology Council Bactericidal activity value ≥ 0
Processing product with silver ion ball passed
Raw product rejected

3. Duration test of antibacterial and deodorizing effect Using a spray container having a water capacity of 300 ml, one silver ion ball was immersed, and the amount of elution of silver over time was measured. For the measurement of silver amount, “CCD multi-element simultaneous ICP emission analyzer SPS5000 manufactured by SII Nanotechnology Inc. was used. The results are shown in Table 4.

表４の結果から推定すると、使用した銀イオンボール１個には銀が約６６ｍｇ含有 されているため、下記のように長期間、抗菌防臭用の菌イオンスプレー液として使用 することができる。

As estimated from the results in Table 4, since one silver ion ball used contains about 66 mg of silver, it can be used as a fungus ion spray solution for antibacterial deodorization for a long period of time as described below.

・ If the silver ion ball is immersed for 3 hours and the spray of 300ml capacity is used up immediately, if one spray is used in one day
66 ÷ 0.031 = 2129 bottles / day = approx. 5 years and 9 months / when immersed for 24 hours
66 ÷ 0.077 = 857 bottles / day = approx. 2 years and 4 months / 48 hours of immersion, provided that one bottle is used in 2 days
66 ÷ 0.139 = 474 bottles / 2 days = about 2 years and 7 months

The schematic diagram which shows an example of a silver carrying ceramic porous body. The schematic diagram of the ceramic porous body which carry | supported the organic type antibacterial and antifungal agent and silver. (A) The schematic diagram of the silver carrying | support ceramic porous body which has an inorganic coating layer. (B) Schematic diagram of an organic antibacterial and antifungal agent having an inorganic coating layer and a porous ceramic body carrying silver.

Explanation of symbols

 DESCRIPTION OF SYMBOLS 1 ... Ceramic porous body, 2 ... Ceramic aggregate, 3 ... Internal pore, 4 ... Ultra fine particle silver particle, 5 ... Organic antibacterial and antifungal agent, 6 ... Silver fine particle derived from alkoxy silver, 7 ... Coarse silver, 8 ... Zinc oxide fine particles, 9 ... Silica coating

Claims (3)

A silver-supporting ceramic porous body for silver ion spraying, characterized in that silver fine particles are supported in the internal pores of the ceramic porous body. 2. The silver-carrying ceramic porous body for silver ion spray according to claim 1, wherein an organic antibacterial and antifungal agent is further carried in the internal pores of the ceramic porous body. . The silver-supporting ceramic porous body for silver ion spray according to claim 1 or 2, wherein the surface of the ceramic porous body is covered with an inorganic coating layer containing silver particles and / or silver ultrafine particles derived from alkoxy silver. A silver-supporting ceramic porous body characterized by the above.

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