JPH11323475A - Antibacterial sintered body and antibacterial filter using it - Google Patents
Antibacterial sintered body and antibacterial filter using itInfo
- Publication number
- JPH11323475A JPH11323475A JP10133208A JP13320898A JPH11323475A JP H11323475 A JPH11323475 A JP H11323475A JP 10133208 A JP10133208 A JP 10133208A JP 13320898 A JP13320898 A JP 13320898A JP H11323475 A JPH11323475 A JP H11323475A
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- silver
- antibacterial
- silver oxide
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】例えば、抗菌性能の必要とさ
れる水道水・飲料水用の抗菌性焼結体からなるフィルタ
−に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a filter comprising an antibacterial sintered body for tap water and drinking water requiring antibacterial performance.
【０００２】[0002]
【従来の技術】一般に、従来水道水・飲料水用浄水材料
には活性炭が使用されている。これは汚れの除去には有
効であるが、雑菌の繁殖を抑制するような抗菌機能は全
く有していなかった。その結果藻類の繁殖に起因する汚
れ・ぬめり等が発生するという問題があった。このよう
な現象に対する対策として、活性炭粉末中に抗菌金属で
ある銀系化合物を混合する、あるいは、活性炭に銀を担
持させた材料が開発、実用化されている。また、同様の
目的で、銀の粉末を焼結して取り扱いの簡易なフィルタ
−板状の成形体として使用する例（特開平８−７１３３
９号、特開平９−１４９８５４号）もある。2. Description of the Related Art In general, activated carbon is conventionally used as a water purification material for tap water and drinking water. This is effective in removing dirt, but has no antibacterial function to suppress the growth of various bacteria. As a result, there is a problem that dirt, slimming, and the like due to the propagation of algae occur. As a countermeasure against such a phenomenon, a material in which a silver-based compound which is an antibacterial metal is mixed in activated carbon powder, or a material in which activated carbon carries silver is developed and put into practical use. Further, for the same purpose, an example of sintering silver powder and using it as a filter-plate-shaped molded body which is easy to handle (JP-A-8-7133)
9 and JP-A-9-149854).
【０００３】[0003]
【発明が解決しようとする課題】上述せる従来技術にお
いては、例えば、金属銀を抗菌成分とした場合、その溶
出速度が小さく抗菌性が発現するのに時間がかかるとい
う欠点がある。また、銀の粉末として安価な電解析出銀
等を用いると製品フィルタ−の気孔率や空孔径等を制御
することが困難であった。一方、銀糸、銀線、銀メッキ
繊維（特開平８−７１３３９号）を材料とするものや、
スリップキャスト法やドクタ−ブレ−ド法（特開平９−
１４９８５４号）に基づく銀焼結体では、焼結体自体の
強度が低く長期間の使用によって破損する場合もあり、
実用上の問題点があった。The prior art described above has a drawback that, for example, when metallic silver is used as an antibacterial component, the dissolution rate is small and it takes time for the antibacterial property to be exhibited. Also, if inexpensive electrolytically deposited silver or the like is used as silver powder, it is difficult to control the porosity, pore diameter, and the like of the product filter. On the other hand, those made of silver thread, silver wire, and silver-plated fiber (Japanese Patent Laid-Open No. 8-71339),
Slip casting method and doctor blade method (Japanese Unexamined Patent Publication No.
149854), the strength of the sintered body itself is low and the sintered body itself may be damaged by long-term use.
There were practical problems.
【０００４】本発明は、上記事情に鑑みなされたもの
で、従来技術において見られる上述の様な不具合がな
く、抗菌性の発現が早く、かつ抗菌効果が長期間に亘っ
て持続し、製造も容易で、長期間に亘っての使用が可能
な抗菌体を提供することを目的とする。[0004] The present invention has been made in view of the above circumstances, does not have the above-mentioned disadvantages found in the prior art, exhibits antibacterial properties quickly, has an antibacterial effect for a long period of time, and can be manufactured. An object of the present invention is to provide an antibacterial substance which is easy and can be used for a long period of time.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明においては、銀−酸化銀複合焼結体を利用す
ることを特徴とする。つまり、（１）銀−酸化銀複合焼
結体において、重量％で、酸化銀が５〜３０である抗菌
性焼結体、（２）（１）記載の抗菌性焼結体からなる抗
菌性フィルタ−、に特徴を有するものである。In order to achieve the above object, the present invention is characterized in that a silver-silver oxide composite sintered body is used. In other words, (1) an antibacterial sinter having silver oxide of 5 to 30 by weight in the silver-silver oxide composite sinter, and (2) an antibacterial sinter comprising the antibacterial sinter according to (1). The filter has a feature.
【０００６】本発明においては、例えば、銀−酸化銀複
合焼結体を水道水用のフィルタ−として使用した場合、
酸化銀の存在により抗菌性を有する銀イオンの溶出が容
易となり、かつ焼結体中の酸化銀の含有量を調節するこ
とにより、その溶出速度を制御し、長期間に亘って十分
な殺菌力を維持することが出来る。In the present invention, for example, when a silver-silver oxide composite sintered body is used as a filter for tap water,
The presence of silver oxide facilitates the elution of antibacterial silver ions, and controls the elution rate by adjusting the content of silver oxide in the sintered body to provide sufficient sterilizing power over a long period of time. Can be maintained.
【０００７】また、銀との複合焼結体とすることによ
り、長期間の使用に耐える高強度の焼結体を得ることが
出来、更に酸化銀焼結体を大気中で焼結するという簡単
な方法で、所望の焼結体が得られ、取り扱い上、コスト
面においても非常に有利である。Further, by forming a composite sintered body with silver, a high-strength sintered body that can withstand long-term use can be obtained, and furthermore, a silver oxide sintered body can be sintered in the air. A desired sintered body can be obtained by a simple method, which is very advantageous in terms of handling and cost.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。まず、酸化銀粉末（平均粒径１μｍ〜１ｍ
ｍ）を用意し、この粉末を一軸油圧プレス等の冷間プレ
スで、荷重１０〜２００ｋｇｆ／ｃｍ2にて圧縮し素成
形体を作製した。これを、揮発性焼結助剤であるポリエ
チレン、ポリスチレン、ポリビニ−ルアルコ−ル、ビス
コ−ス等のバインダ−（配合率０〜２０％）と共にボ−
ルミルを用いて均一混合し、その混合物を大気炉で２０
０〜５００℃にて０．５時間焼結を行い、本発明の抗菌
性焼結体を作製した。次いで、この焼結体から１５ｍｍ
φ×２ｍｍt形状の本発明の抗菌性フィルタ−を作製し
た。Embodiments of the present invention will be described below. First, a silver oxide powder (average particle size 1 μm to 1 m
m) was prepared, and this powder was compressed by a cold press such as a uniaxial hydraulic press under a load of 10 to 200 kgf / cm 2 to produce a green compact. This is mixed with a volatile sintering aid such as a binder such as polyethylene, polystyrene, polyvinyl alcohol, and viscos (a blending ratio of 0 to 20%).
Using a mill, and mix the mixture in an air furnace for 20 minutes.
Sintering was performed at 0 to 500 ° C. for 0.5 hour to prepare an antibacterial sintered body of the present invention. Then, 15 mm from this sintered body
An antimicrobial filter of the present invention having a φ × 2 mm t shape was prepared.
【０００９】以下、数値限定した理由について説明す
る。 （イ）酸化銀の含有量 酸化銀の含有量は、本発明の抗菌材料において、抗菌性
の早期発現性を損なうことなく、有効な抗菌性を長期間
持続せしめるに必要な値で、その値が３０％を超える
と、焼結体の強度が不十分となり、また、銀イオンの溶
出速度が過大となり、周囲の部材表面上へ銀化合物の沈
着が発生するので、その値を、５〜３０重量％と定め
た。望ましくは、８〜２５％重量％である。The reason for limiting the numerical values will be described below. (B) Content of Silver Oxide The content of silver oxide is a value necessary to maintain effective antibacterial properties for a long period of time in the antibacterial material of the present invention without impairing the early manifestation of antibacterial properties. Exceeds 30%, the strength of the sintered body becomes insufficient, and the elution rate of silver ions becomes excessive, causing the deposition of silver compounds on the surface of the surrounding members. % By weight. Desirably, it is 8 to 25% by weight.
【００１０】本発明においては、酸化物銀粉末の粒径
は、焼結体の適正な強度を得る作用をするが、その値が
１μｍ未満では、上記作用効果が得られなくなり、一方
その値が、１ｍｍを超えると、焼結体の緻密度が低下す
るので、その値を、１μｍ〜１ｍｍが望ましく、更に望
ましくは、１０〜３００μｍである。In the present invention, the particle size of the silver oxide powder acts to obtain an appropriate strength of the sintered body, but if the value is less than 1 μm, the above-mentioned effect cannot be obtained. If it exceeds 1 mm, the compactness of the sintered body is reduced. Therefore, the value is desirably 1 μm to 1 mm, and more desirably 10 to 300 μm.
【００１１】また、揮発性焼結助剤の配合率は、酸化銀
の還元率を適正に制御する作用を有するが、その値が、
２０％を超えると、酸化銀の還元効果が必要以上に過大
となるので、その値は、０〜２０％が望ましい。さらに
望ましくは、０〜１０％である。The volatile sintering aid has a function of properly controlling the reduction ratio of silver oxide.
If it exceeds 20%, the effect of reducing silver oxide becomes excessively large. Therefore, the value is desirably 0 to 20%. More preferably, it is 0 to 10%.
【００１２】冷間成形圧の値は、１０〜２００ｋｇｆ／
ｃｍ2が望ましく、更に望ましくは、１００〜１５０ｋ
ｇｆ／ｃｍ2である。The value of the cold forming pressure is 10 to 200 kgf /
cm 2 is desirable, and more desirably 100 to 150 k
gf / cm 2 .
【００１３】焼成温度は、酸化銀の適正な含有量を得る
作用をするが、その値が、２００℃未満では、焼結速度
が遅く、実用に適さない。一方その値が５００℃を超え
ると焼結が過度に進行し、焼結体全体が金属銀に還元さ
れてしまうので、その値は、２００〜５００℃が望まし
い。更に望ましくは、２５０〜３００℃である。The sintering temperature acts to obtain an appropriate content of silver oxide. If the sintering temperature is less than 200 ° C., the sintering speed is low, which is not suitable for practical use. On the other hand, if the value exceeds 500 ° C., sintering proceeds excessively, and the entire sintered body is reduced to metallic silver. Therefore, the value is desirably 200 to 500 ° C. More desirably, the temperature is 250 to 300 ° C.
【００１４】[0014]
【実施例】以下、本発明の実施例について具体的に説明
する。 [実施例１]湿式合成法を用いて作製した酸化銀粉末（平
均粒径：１８．２μｍ）を、冷間プレスで荷重１５０ｋ
ｇｆ／ｃｍ2にて圧縮し素成形体を作製した。これをバ
インダ−（ポリエチレン粉末）と共にボ−ルミルを用い
て均一混合し、その混合粉を大気炉にて２３０℃で０．
５時間焼結を行ない、本発明の抗菌性焼結体１（以下、
単に本発明焼結体１と言う）を作製した。次いで、得ら
れた焼結体から１５ｍｍφ×２ｍｍt形状の本発明の抗
菌性フィルタ−１（以下、単に本発明フィルタ−１と言
う）を作製した。Embodiments of the present invention will be specifically described below. [Example 1] A silver oxide powder (average particle size: 18.2 µm) produced by a wet synthesis method was cold-pressed to a load of 150 k.
It was compressed at gf / cm 2 to produce a green compact. This was uniformly mixed with a binder (polyethylene powder) using a ball mill, and the mixed powder was dried at 230 ° C. in an air furnace at 0.2 ° C.
After sintering for 5 hours, the antibacterial sintered body 1 of the present invention (hereinafter referred to as “
(Hereinafter simply referred to as the sintered body 1 of the present invention). Then, the antimicrobial filter of the present invention having a diameter of 15 mm × 2 mm t shape of a sintered body obtained -1 (hereinafter, simply referred to as the present invention filters -1) was manufactured.
【００１５】[実施例２]酸化銀粉末の平均粒径：１５０
μｍ、バインダ−（ポリビニ−ルアルコ−ル）、プレス
圧１２０ｋｇｆ／ｃｍ2、焼結温度３００℃以外は、実
施例１と同様にして、本発明の抗菌性焼結体２（以下、
単に本発明焼結体２と言う）および本発明の抗菌性フィ
ルタ−２（以下、単に本発明フィルタ−２と言う）を作
製した。Example 2 Average particle size of silver oxide powder: 150
The antibacterial sintered body 2 of the present invention (hereinafter, referred to as “Example 1”) except that the binder was a binder (polyvinyl alcohol), the pressing pressure was 120 kgf / cm 2 , and the sintering temperature was 300 ° C.
A sintered body 2 of the present invention) and an antibacterial filter-2 of the present invention (hereinafter, simply referred to as filter 2 of the present invention) were produced.
【００１６】[実施例３]酸化銀粉末の平均粒径：５００
μｍ、バインダ−（ポリスチレン）、プレス圧１８０ｋ
ｇｆ／ｃｍ2、焼結温度４５０℃以外は、実施例１と同
様にして、本発明の抗菌性焼結体３（以下、単に本発明
焼結体３と言う）および本発明の抗菌性フィルタ−３
（以下、単に本発明フィルタ−３と言う）を作製した。Example 3 Average particle size of silver oxide powder: 500
μm, binder (polystyrene), press pressure 180k
Except for gf / cm 2 and sintering temperature of 450 ° C., the antibacterial sintered body 3 of the present invention (hereinafter simply referred to as the sintered body of the present invention 3) and the antibacterial filter of the present invention in the same manner as in Example 1. -3
(Hereinafter, simply referred to as filter 3 of the present invention).
【００１７】[従来例１]電解析出にて精製した後粉砕し
て作製した金属銀粉末（平均粒径：２４、７μｍ）を用
いて実施例１と同様の工程にて、従来の抗菌性焼結体１
（以下、単に従来焼結体１と言う）および従来の抗菌性
フィルタ−１（以下、単に従来フィルタ−１と言う）を
作製した。[Conventional Example 1] A conventional antibacterial property was obtained in the same process as in Example 1 by using metallic silver powder (average particle size: 24, 7 μm) produced by purifying by electrolytic deposition and pulverizing. Sintered body 1
(Hereinafter simply referred to as conventional sintered body 1) and conventional antibacterial filter-1 (hereinafter simply referred to as conventional filter-1).
【００１８】[従来例２]金属銀インゴットを転打加工お
よび冷間伸線加工により、直径０．３ｍｍの素線とし、
これを真空炉中で３００℃、１時間の焼鈍処理を行って
金属銀ワイヤ−とした。このワイヤ−を冷間プレスで２
０ｋｇｆ／ｃｍ2の荷重を加えて粗成形し、再び焼鈍処
理（３００℃、１時間）を行い、従来の抗菌性焼結体２
（以下、単に従来焼結体２と言う）を作製した。次い
で、この焼結体から１３ｍｍφ×３ｍｍtの円盤を切り
出し、テフロン製の支持容器（外寸法：実施例および従
来例のフィルタ−を）に入れて、フィルタ−状試験片で
ある従来の抗菌性フィルタ−２（以下、単に従来フィル
タ−２と言う）を作製した。テフロン容器の上下円形面
には直径０．５ｍｍｔの穴が約４０個ずつ開けられてお
り、液体を透過できる様になっている。[Conventional example 2] A metal silver ingot is formed into a strand having a diameter of 0.3 mm by rolling and cold drawing.
This was annealed at 300 ° C. for 1 hour in a vacuum furnace to obtain a metallic silver wire. This wire is cold pressed 2
A load of 0 kgf / cm 2 was applied to carry out rough forming, and an annealing treatment (300 ° C., 1 hour) was again performed to obtain a conventional antibacterial sintered body 2
(Hereinafter simply referred to as conventional sintered body 2). Next, a 13 mmφ × 3 mm t disk was cut out from the sintered body, placed in a Teflon-made support container (external dimensions: filters of Examples and Conventional Examples), and a conventional antibacterial property as a filter-like test piece was obtained. Filter-2 (hereinafter simply referred to as conventional filter-2) was produced. Approximately 40 holes each having a diameter of 0.5 mmt are formed in the upper and lower circular surfaces of the Teflon container so that liquid can pass therethrough.
【００１９】上記の実施例および従来例の焼結体の焼結
密度を夫々表１に示した。フィルタ−材の耐久性試験と
して、水道蛇口部に、上記のフィルタ−を夫々用い、そ
の損傷程度を調べた。直径１５ｍｍの水道パイプ中に実
施例および従来例のフィルタ−を固定し、水道水を５ｌ
／ｍｉｎの流量で１分間管を閉じて静置するというサイ
クルを６０００回まで行った。フィルタ−の損傷につい
ては、重量変化および実体顕微鏡による外観観察によ
り、評価を行った。得られた結果を表２に示した。Table 1 shows the sintering densities of the sintered bodies of the above embodiment and the conventional example. As a durability test of the filter material, each of the above filters was used at a water tap, and the degree of damage was examined. The filters of the embodiment and the conventional example were fixed in a tap pipe having a diameter of 15 mm.
A cycle of closing the tube at a flow rate of / min for 1 minute and allowing the tube to stand still was performed up to 6000 times. The damage of the filter was evaluated by weight change and appearance observation by a stereoscopic microscope. Table 2 shows the obtained results.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】水道管残留水に対する殺菌能力試験をＪI
Ｓの菌数測定法に準拠した以下の方法により行った。実
施例および従来例のフィルタ−を装着した内径１５ｍｍ
φ×５００ｍｍのステンレス管全体を減菌し、蒸留水８
３ｍｌに大腸菌培養液（菌数：約２×１０５cfu／ｍ
ｌ）を５ｍｌ加えて封入する。これらと、フィルタ−を
挿入せずに蒸留水のみを封入した対照試料について、２
５℃にて７２時間まで静置し、生菌数を調べた。また、
本試験用フィルタ−には製造直後のものに加え、前記の
耐久性試験において水流開閉サイクル６０００回まで試
験したフィルタ−についても本抗菌性試験に供した。結
果を表３に示した。The sterilization ability test for water remaining in water pipes was conducted by JI
The measurement was performed by the following method based on the method for measuring the number of bacteria of S. Inner diameter of 15 mm with filters of Examples and Conventional Examples attached
Sterilize the entire φ × 500 mm stainless steel tube and add distilled water 8
E. coli culture solution (number of bacteria: about 2 × 105 cfu / m)
l) is added and sealed. These and a control sample containing only distilled water without a filter inserted therein
The mixture was allowed to stand at 5 ° C for up to 72 hours, and the number of viable cells was examined. Also,
In addition to the filter for this test immediately after production, the filter tested up to 6000 water flow opening / closing cycles in the aforementioned durability test was also subjected to this antibacterial test. The results are shown in Table 3.
【００２３】[0023]
【表３】 [Table 3]
【００２４】[0024]
【発明の効果】表１〜３で明らかな様に、本発明の抗菌
性焼結体１〜３および抗菌性フィルタ−１〜３は、従来
の抗菌性焼結体１〜２および抗菌性フィルタ−１〜２に
較べ、その焼結体から構成されるフィルタ−の耐久性試
験に於いて、重量変化および外観観察によって、損傷程
度が小さく、その優れた耐久性が認められ、焼結体の密
度も高く長期間の使用に耐える強度を有することが明ら
かである。また、菌数測定法により、減菌作用に優れて
いることが判明し、本発明の焼結体およびフィルタ−を
利用することにより、関連分野で大いに貢献することが
期待される。As apparent from Tables 1 to 3, the antibacterial sintered bodies 1 to 3 and the antibacterial filters 1 to 3 of the present invention are the same as the conventional antibacterial sintered bodies 1 to 2 and the antibacterial filter. As compared with 1-2, in the durability test of the filter composed of the sintered body, the degree of damage was small and the excellent durability was recognized by the weight change and the appearance observation, It is apparent that the material has a high density and a strength to withstand long-term use. In addition, it was found by the method of measuring the number of bacteria that the bacterium had an excellent sterilizing effect, and it is expected that the use of the sintered body and the filter of the present invention will greatly contribute to related fields.
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ０２Ｆ 1/50 ５３１ Ｃ０２Ｆ 1/50 ５３１Ｔ ５４０ ５４０Ｆ ５５０ ５５０Ｂ ５６０ ５６０Ｚ Ｃ２２Ｃ 1/05 Ｃ２２Ｃ 1/05 Ｅ Continued on the front page (51) Int.Cl. 6 Identification code FI C02F 1/50 531 C02F 1/50 531T 540 540F 550 550B 560 560Z C22C 1/05 C22C 1/05 E
Claims (2)
で、酸化銀が５〜３０であることを特徴とする抗菌性焼
結体。1. A silver-silver oxide composite sintered body, comprising:
, Wherein the silver oxide is 5 to 30.
を特徴とする抗菌性フィルタ−。2. An antibacterial filter comprising the antibacterial sintered body according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13320898A JP4134376B2 (en) | 1998-05-15 | 1998-05-15 | Antibacterial sintered body and antibacterial filter using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13320898A JP4134376B2 (en) | 1998-05-15 | 1998-05-15 | Antibacterial sintered body and antibacterial filter using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11323475A true JPH11323475A (en) | 1999-11-26 |
| JP4134376B2 JP4134376B2 (en) | 2008-08-20 |
Family
ID=15099269
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13320898A Expired - Fee Related JP4134376B2 (en) | 1998-05-15 | 1998-05-15 | Antibacterial sintered body and antibacterial filter using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4134376B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005314281A (en) * | 2004-04-28 | 2005-11-10 | Kitasato Gakuen | Bactericide for bacteria living in environmental water and bactericidal method |
| CN112759952A (en) * | 2020-12-25 | 2021-05-07 | 浙江苏生元福珠宝有限公司 | Oily sintered silver paste and preparation method thereof |
| CN112806388A (en) * | 2019-11-15 | 2021-05-18 | 银未来株式会社 | Antibacterial product, antibacterial rod and water storage container |
-
1998
- 1998-05-15 JP JP13320898A patent/JP4134376B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005314281A (en) * | 2004-04-28 | 2005-11-10 | Kitasato Gakuen | Bactericide for bacteria living in environmental water and bactericidal method |
| CN112806388A (en) * | 2019-11-15 | 2021-05-18 | 银未来株式会社 | Antibacterial product, antibacterial rod and water storage container |
| CN112759952A (en) * | 2020-12-25 | 2021-05-07 | 浙江苏生元福珠宝有限公司 | Oily sintered silver paste and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4134376B2 (en) | 2008-08-20 |
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