JP2021123786A - Phosphor bronze alloy whose antibacterial property is amplified by roughening surface using anodic oxidation method in which the surface is subjected to immersion treatment for a fixed time - Google Patents
Phosphor bronze alloy whose antibacterial property is amplified by roughening surface using anodic oxidation method in which the surface is subjected to immersion treatment for a fixed time Download PDFInfo
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本発明は抗菌性を有するリン青銅合金と、その抗菌性を表面粗面化処理により増幅させる処理法に関するものである。 The present invention relates to a phosphor bronze alloy having antibacterial properties and a treatment method for amplifying the antibacterial properties by surface roughening treatment.
アルミニウム及びステンレスなどが色調変化を期待して陽極酸化技術を利用することは従来から知られていて、出来上がったものは、様々な分野に使用されている。これらの金属は殺菌性や抗菌性の発現を目的としている訳ではなく、金属のイオン化を防止すると共に、飽く迄も色調の変化維持に拘った使用法となっている。
本発明の背景は、陽極酸化技術に基づく色調変化を経時変化を取りながら進め、併行して抗菌性試験を実施したことに始まる。It has been conventionally known that aluminum, stainless steel, etc. use anodizing technology in anticipation of a change in color tone, and the finished products are used in various fields. These metals are not intended to exhibit bactericidal and antibacterial properties, but are used to prevent ionization of metals and to maintain color change until they get tired of it.
The background of the present invention begins with the fact that the color tone change based on the anodizing technique is advanced while taking the time-dependent change, and the antibacterial property test is carried out in parallel.
一方で、リン青銅はスズを含む合金で、機械的な強度や導電性に優れ、加工性にも優れていることから、電子部品や各種電機製品に用いられている。加工性に優れていることから、用途に合わせた形状に加工することが容易で、この特徴と、殺菌性あるいは抗菌性の両方を活用することにより、従来とは異なる用途展開が期待できる。On the other hand, phosphor bronze is an alloy containing tin and is used in electronic parts and various electric products because it has excellent mechanical strength, conductivity, and workability. Since it is excellent in workability, it is easy to process it into a shape suitable for the application, and by utilizing both this feature and the bactericidal or antibacterial property, it can be expected to develop applications different from the conventional ones.
このような観点から、殺菌性や抗菌性を必要とする分野への銅合金の使用例を概観すると、例えば、銅線を編み込むことにより、水虫の予防効果を付与した靴下が挙げられる。また、特許文献１には、銅や銀などの金属で構成した金網を用いた、水系洗浄液を濾過する濾過装置が開示されている。From this point of view, an overview of examples of the use of copper alloys in fields requiring bactericidal and antibacterial properties includes, for example, socks in which a copper wire is woven to provide a preventive effect on athlete's foot. Further,
また、特許文献２には、銀、銅、亜鉛、スズなどから選ばれる消臭抗菌成分を担持させた酸化チタン粒子と、アミン系化合物からなる抗菌消臭剤が開示されている。しかし、これらはいずれも、人の手などが直接触れるものではなく、例えば、医療機関の通路に付設される手摺などのように、手で直接触れることが使用目的で、しかも高度の殺菌性あるいは抗菌性が要求されるものは、見出せないのが実情である。Further,
この理由としては、リン青銅が、純銅よりも高い抗菌性を示すことが明確に示されていなかったことと、銅及び銅合金は人体との接触により、変色が生じやすいことが挙げられる。The reasons for this are that phosphor bronze has not been clearly shown to exhibit higher antibacterial properties than pure copper, and that copper and copper alloys are prone to discoloration due to contact with the human body.
従って、本発明の課題は、陽極酸化法によりリン青銅が保有する抗菌性を増幅させることを可能とする共に、リン青銅の人体との接触による変色を軽減する方法を提供して、本リン青銅の抗菌性を活用し得る用途の多様化と共に提案を拡大することにある。Therefore, an object of the present invention is to provide a method for amplifying the antibacterial property of phosphor bronze by anodization method and reducing discoloration of phosphor bronze due to contact with a human body. The purpose is to expand the proposals along with the diversification of applications that can utilize the antibacterial properties of.
本発明は、前記課題に鑑み、リン青銅板の保有する抗菌性を増幅させると共に、表面の性状に基づく人体との接触による色調の経時変化、自然変色の顕在化防止との関係を検討した結果なされたものである。In view of the above problems, the present invention is a result of examining the relationship between the antibacterial property possessed by the phosphor bronze plate, the time-dependent change in color tone due to contact with the human body based on the surface properties, and the prevention of the manifestation of natural discoloration. It was made.
即ち、本発明は、１．０５重量％のスズと、０．０９重量％のリンとを含み、残部が銅及び銅と不可避の不純物からなることを特徴とする、高抗菌性を有するリン青銅合金である。That is, the present invention is characterized by containing 1.05% by weight of tin and 0.09% by weight of phosphorus, and the balance is copper and copper and unavoidable impurities. Phosphor bronze having high antibacterial properties. It is an alloy.
また、本発明は、化学処理が施され、表面に化学的な粗面化処理を施されてなることを特徴とする、前記の高抗菌性を有するリン青銅合金である。Further, the present invention is the phosphor bronze alloy having high antibacterial properties, which is characterized by being chemically treated and the surface being chemically roughened.
また、本発明は、前記粗面化処理が水酸化ナトリウムを水で３０〜５０重量％に希釈した９８℃以上に保持した水溶液中に、リン青銅合金板状品を２．５〜３．５分間浸漬処理する陽極酸化法を適用していることを特徴とする、前記の高抗菌性を有するリン青銅合金である。Further, in the present invention, the roughening treatment is performed by diluting sodium hydroxide with water to 30 to 50% by weight and holding the phosphor bronze alloy plate-like product at 98 ° C. or higher in an aqueous solution of 2.5 to 3.5. It is the phosphor bronze alloy having the above-mentioned high antibacterial property, which is characterized by applying an anodization method in which it is immersed for a minute.
また、本発明は、前記の高抗菌性リン青銅合金の薄板であり、表面全部、または一部を被覆してなることを特徴とする物品である。Further, the present invention is an article characterized in that it is a thin plate of the above-mentioned highly antibacterial phosphor bronze alloy, and the entire surface or a part thereof is covered.
本発明者らは、本リン青銅合金に、微生物を用いる抗菌性試験を実施したところ、１．０５％のスズと、０．０９重量％リンを含み、残部が銅と銅の不可避の不純物からなる抗菌性を有するリン青銅合金が陽極酸化法により、色調が大きく変化する経時変化点において、さらに顕著な高抗菌性の発現があったことを見出し、本発明をなした。When the present inventors conducted an antibacterial test using a microorganism in the phosphor bronze alloy, they contained 1.05% tin and 0.09% by weight phosphorus, and the balance was derived from copper and the unavoidable impurities of copper. The present invention has been made by finding that the phosphor bronze alloy having antibacterial properties exhibited more remarkable antibacterial properties at the time-dependent change point where the color tone changed significantly by the anodization method.
一般に銅などの抗菌性の要因の一つとして、金属がイオン化する際に放出される電子が、空気中や水中に溶存する酸素の一部を活性化することが考えられているのは、前記の通りである。リン青銅合金においては、合金を構成する成分の相違及び、粗面化され、加えて陽極酸化により多孔質となったことに伴い、比表面積が拡大したことによりイオン化ポテンシャルに相乗効果が現われ、特定の時間軸において、さらに顕著な高抗菌性を発現するという結果に繋がったものと解される。Generally, as one of the antibacterial factors such as copper, it is considered that the electrons emitted when a metal is ionized activate a part of oxygen dissolved in air or water. It is a street. In the phosphor bronze alloy, a synergistic effect appears on the ionization potential due to the increase in the specific surface area due to the difference in the components constituting the alloy, the roughening, and the porosity due to anodization. It is understood that this led to the result that even more remarkable high antibacterial properties were exhibited on the time axis of.
また、一般に金属表面の外観は、鏡面のように研磨した状態と、化学的に粗面化し加えて着色された状態とでは、大きく異なり、特に適当な表面粗さに粗面化すると、例えば人の手の皮脂のような異物の付着や、酸化による変色が目立たなくなる。本発明者は、この現象に着目し、粗面化および着色の条件の検討により、表面の色調の変化を狙うと共に抗菌性を増幅させた。Further, in general, the appearance of a metal surface differs greatly between a state of being polished like a mirror surface and a state of being chemically roughened and colored. Adhesion of foreign substances such as sebum on the hands and discoloration due to oxidation become inconspicuous. Focusing on this phenomenon, the present inventor aimed at a change in the color tone of the surface and amplified the antibacterial property by examining the conditions for roughening and coloring.
次に、リン青銅合金を陽極酸化させた場合の抗菌性の検討の説明により、本発明の実施の形態について説明する。Next, an embodiment of the present invention will be described by explaining the examination of antibacterial properties when the phosphor bronze alloy is anodized.
ここで抗菌性を検証するために用いたリン青銅の試料は、形状が縦×横×厚み３０ｍｍ×８０ｍｍ×０．２５ｍｍ片で、その組成は、スズが、１．０５重量％、リンが０．０９重量％、残部が銅と銅との不可避の不純物からなることを特徴とする、抗菌性を有するリン青銅合金である。The phosphor bronze sample used here to verify the antibacterial property is a piece having a shape of length × width ×
上記試験片を１２片つくり、３片毎に時間軸を０（溶液中に入れず）、１分、３分、１５分と処理時間を決め水溶液（温度９８℃以上）中に浸漬させ、陽極酸化処理をし、取り出した切片を、ＪＩＳ Ｌ １９０２に準じたハロー試験を行った。試験に用いた菌は、黄色ブドウ球菌である。図１は、ハロー試験の一例を示す写真で、ここに示したのは黄色ブドウ球菌の例である。Make 12 pieces of the above test piece, set the time axis to 0 (not put in the solution) for each 3 pieces, set the treatment time to 1 minute, 3 minutes, and 15 minutes, and immerse in an aqueous solution (temperature 98 ° C. or higher) to anodize. The sections that had been oxidized and taken out were subjected to a halo test according to JIS L 1902. The bacterium used in the test is Staphylococcus aureus. FIG. 1 is a photograph showing an example of a halo test, and here is an example of Staphylococcus aureus.
ハロー試験では、シャーレの中に菌を培養し、中央に試験片を置いて一定時間保持する。そして試験片周辺の菌が消滅した、ハローと称される領域の幅を測定する。試験は４時間軸に対し３回異なる試験片を用いて行った。ハロー幅は、図１にＡ、Ｂ、Ｃ、Ｄで示したように、試験片の４辺に対して測定するので、１条件に対し１２回の測定を行ったIn the halo test, the bacteria are cultured in a petri dish, and a test piece is placed in the center and held for a certain period of time. Then, the width of the area called the halo where the bacteria around the test piece have disappeared is measured. The test was performed using different test pieces three times with respect to the 4-hour axis. As shown by A, B, C, and D in FIG. 1, the halo width is measured on four sides of the test piece, so that the measurement was performed 12 times under one condition.
表１は、試験に用いた時間軸毎に、ハロー幅の測定値の平均値をまとめた表である。また、図２は表１に示したハロー試験の結果を、横軸を時間、縦軸をハロー幅として示した図である。Table 1 is a table summarizing the average values of the measured values of the halo width for each time axis used in the test. Further, FIG. 2 is a diagram showing the results of the halo test shown in Table 1 with the horizontal axis representing time and the vertical axis representing halo width.
表１と図２に示したように、本試験条件により、陽極酸化させた銅合金片は、陽極酸化させなかったものと比較し、陽極酸化時間１分と３分で増幅した。陽極酸化時間を０、１、３、１５分の４経時時間とし、その極値２．５〜３．５分を見つけ出せたのは、粗面化および着色状況を観察しながら進めた途中において、大きな変化があった時間を計測、１分前後で少し黒褐色化が始まり、２．５〜３．５分過ぎにさらに着色が進んだ。そして３．５分過ぎから色は徐々に濃くなっていくがそれほど大きな変化が見られなくなった。ｎ＝３×４で上記結果を得た。図３は、陽極酸化処理時間３分時のものであり、水液中に浸漬させた部分が粗面化し黒褐色しているのが分かる。As shown in Table 1 and FIG. 2, under the present test conditions, the anodized copper alloy pieces were amplified in anodizing time of 1 minute and 3 minutes as compared with those not anodized. The anodizing time was set to 0, 1, 3, and 15 minutes, and the extreme value of 2.5 to 3.5 minutes was found during the process while observing the roughening and coloring conditions. The time when there was a big change was measured, and a little dark browning started around 1 minute, and further coloring progressed after 2.5 to 3.5 minutes. After 3.5 minutes, the color gradually darkened, but no significant change was seen. The above results were obtained with n = 3 × 4. FIG. 3 shows the anodizing treatment time of 3 minutes, and it can be seen that the portion immersed in the water solution is roughened and dark brown.
図３は、本発明に係るリン青銅合金表面を、陽極酸化技術を用いて粗面化した写真の例である。ここで粗面化加工に用いた陽極酸化水溶液は水酸化ナトリウムを水で３０〜５０重量％に希釈したものである（陽極酸化に使用される化学液でＮａＯＨを使用する場合、水溶液中で電気分解し、Ｎａ＋とＯＨ−とにうまく分解させるために必要な水溶液は、ＮａＯＨ：Ｈ２Ｏ＝３〜５：５〜７）。リン青銅は、通常の圧延仕上がり段階での表面では、直接手で触れると指紋跡が目立つが、表面をこのように化学処理で粗面化加えて着色することにより、指紋跡の視認が困難になった。FIG. 3 is an example of a photograph in which the surface of the phosphor bronze alloy according to the present invention is roughened by using an anodizing technique. Here, the anodic oxide aqueous solution used for the roughening process is sodium hydroxide diluted with water to 30 to 50% by weight (when NaOH is used in the chemical solution used for anodic oxidation, it is electrolyzed in the aqueous solution. The aqueous solution required for decomposition and successful decomposition into Na + and OH − is NaOH: H 2 O = 3 to 5: 5 to 7). On the surface of phosphor bronze in the normal rolling finish stage, fingerprint marks are conspicuous when touched directly by hand, but by roughening and coloring the surface by chemical treatment in this way, it becomes difficult to see the fingerprint marks. became.
図４は、陽極酸化により粗面化したリン青銅合金表面をＳＥＭ（走査型顕微鏡）で観察した写真であり、経時変化により多孔質となっていく過程を処理時間１分（左図）と３分（右図）の写真が示していることが分かる。FIG. 4 is a photograph of the surface of the phosphor bronze alloy roughened by anodization observed with an SEM (scanning electron microscope). It can be seen that the photograph of the minute (right figure) shows.
図５は、約０．２５ｍｍの厚さに圧延し、表面を粗面化した、本発明の陽極酸化リン青銅合金薄板を、手摺表面に取り付けた一例を示す斜視図である。図４において、１は手摺、２は陽極酸化リン青銅合金薄板、３ａ及び３ｂは手摺１を壁面に取り付けるためのフランジ部である。医療機関や高齢者の介護施設の通路や出入り口には、ここに示したように、手摺やドアノブなどの直接手で触れる部分を、本発明の陽極酸化リン青銅合金の薄板で覆うことにより、感染症の蔓延を事前に防止することができる。FIG. 5 is a perspective view showing an example in which the phosphor bronze alloy thin plate of the present invention, which has been rolled to a thickness of about 0.25 mm and has a roughened surface, is attached to the surface of a handrail. In FIG. 4, 1 is a handrail, 2 is an anodized phosphor bronze alloy thin plate, and 3a and 3b are flanges for mounting the
以上に示したように、本発明によれば、抗菌性に優れたリン青銅合金を提供することができる。なお、本発明は、前記実施の形態に限定されるものではなく、本発明の分野における通常の知識を有する者であれば想到し得る、各種変形、修正を含む、本発明の要旨を逸脱しない範囲の設計変更があっても、本発明に含まれることは勿論である。As shown above, according to the present invention, it is possible to provide a phosphor bronze alloy having excellent antibacterial properties. The present invention is not limited to the above-described embodiment, and does not deviate from the gist of the present invention, including various modifications and modifications that can be conceived by a person having ordinary knowledge in the field of the present invention. Of course, even if there is a design change in the range, it is included in the present invention.
１・・・手摺
２・・・リン青銅合金薄板
３ａ，３ｂ・・・フランジ部
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2021168978A (en) * | 2020-02-04 | 2021-10-28 | 株式会社三洋物産 | Game machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828893A (en) * | 1981-08-13 | 1983-02-19 | 日本鉱業株式会社 | Method of surface treating printed circuit copper foil |
| JP5656138B1 (en) * | 2014-05-08 | 2015-01-21 | 株式会社原田伸銅所 | Phosphor bronze alloy having antibacterial properties and article using the same |
| JP2017087219A (en) * | 2015-11-02 | 2017-05-25 | Ｄｏｗａメタルテック株式会社 | Heat sink and its manufacturing method |
| JP2019065375A (en) * | 2017-09-29 | 2019-04-25 | 株式会社原田伸銅所 | Copper alloy powder having antibacterial properties and antivirus properties and article using the same |
| JP2019089752A (en) * | 2017-11-10 | 2019-06-13 | 株式会社原田伸銅所 | Article in which antibacterial property is reduced 30% or more by applying specific coating agent to thin film sheet shaped article by roughing phosphor bronze alloy surface, glossiness is further eliminated by the coating agent compared to phosphor bronze alloy remaining roughening state and fingerprint is prevented from becoming conspicuous |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828893A (en) * | 1981-08-13 | 1983-02-19 | 日本鉱業株式会社 | Method of surface treating printed circuit copper foil |
| JP5656138B1 (en) * | 2014-05-08 | 2015-01-21 | 株式会社原田伸銅所 | Phosphor bronze alloy having antibacterial properties and article using the same |
| JP2017087219A (en) * | 2015-11-02 | 2017-05-25 | Ｄｏｗａメタルテック株式会社 | Heat sink and its manufacturing method |
| JP2019065375A (en) * | 2017-09-29 | 2019-04-25 | 株式会社原田伸銅所 | Copper alloy powder having antibacterial properties and antivirus properties and article using the same |
| JP2019089752A (en) * | 2017-11-10 | 2019-06-13 | 株式会社原田伸銅所 | Article in which antibacterial property is reduced 30% or more by applying specific coating agent to thin film sheet shaped article by roughing phosphor bronze alloy surface, glossiness is further eliminated by the coating agent compared to phosphor bronze alloy remaining roughening state and fingerprint is prevented from becoming conspicuous |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021168978A (en) * | 2020-02-04 | 2021-10-28 | 株式会社三洋物産 | Game machine |
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