JP2005281357A - Conductive coating - Google Patents
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- JP2005281357A JP2005281357A JP2004093968A JP2004093968A JP2005281357A JP 2005281357 A JP2005281357 A JP 2005281357A JP 2004093968 A JP2004093968 A JP 2004093968A JP 2004093968 A JP2004093968 A JP 2004093968A JP 2005281357 A JP2005281357 A JP 2005281357A
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本発明は、病院のＭＲＩ室や電波暗室などに代表される電波シールドルームを構築 する際に使用する導電性塗料に関するものである。 The present invention relates to a conductive paint used when constructing an electromagnetic shield room represented by an MRI room or an anechoic chamber of a hospital.
従来、ある空間に電波シールドを構築する場合、その空間全体を僅かな隙間も無いように電波シールド材料で覆う必要がある。現在、上記の電波シールド材としては、厚さ７０マイクロメートル程の銅箔や、導電性金属と木質材料の複合パネルが一般的に広く用いられている。材料の接合部分については、銅箔の場合は接合部の全周にわたってハンダ処理を行うことや、複合パネルについては専用の接合金具によってシールド対象の電波の漏れを防止している。 Conventionally, when constructing a radio wave shield in a certain space, it is necessary to cover the entire space with a radio wave shielding material so that there is no slight gap. Currently, copper foils having a thickness of about 70 micrometers and composite panels made of conductive metal and wood material are generally widely used as the radio wave shielding material. In the case of a copper foil, the material is subjected to soldering over the entire periphery of the joint, and the composite panel is prevented from leaking radio waves to be shielded by a dedicated joint fitting.
しかし、電波シールド材料に銅箔を用いた場合、その薄さ故に施工時のわずかな物理的衝撃によって破れたり、亀裂が生じやすい不具合があった。また接合部分にハンダ処理を行うことは微小な隙間も許されないため、高度な技術と経験を必要とし、熟練した作業員以外のものが行うことはできない問題点もあった。一方、シールド材料として複合パネルを使用した場合は、上記の接合金具を取り付ける際のネジの取り付け間隔、及び締め付けトルクの場所による違いにより、シールドの性能にばらつきが生じてしまい、結果的にシールドされた空間全体において、均一なシールド性能が得られない不具合がある。 However, when a copper foil is used as the radio wave shielding material, there is a problem that it is easily broken due to a slight physical impact during construction because of its thinness. In addition, since a minute gap is not allowed to perform soldering on the joint portion, there is a problem that it requires advanced technology and experience and cannot be performed by anyone other than skilled workers. On the other hand, when a composite panel is used as the shielding material, the shield performance varies due to differences in the screw mounting interval and tightening torque location when mounting the above-mentioned joint fittings, resulting in shielding. There is a problem that uniform shielding performance cannot be obtained in the entire space.
この点を解消するために、水溶性エマルジョンに金属粉末を含有させた導電性塗料が開発されている（例えば、特許文献１参照。）。この導電性塗料では、スプレーによる吹き付け塗装、又はローラーでの塗装が可能になるため、従来の導電性金属箔テープを用いるには適さなかった広範囲にわたる補修または対策が可能になる。また、スプレーで吹き付けることにより、凹凸や曲面、手の入らない隙間及びコーナー部分への使用も導電性金属箔テープに比べ、非常に容易に行うことができる。
しかし、上記従来の導電性塗料では、単位厚さの塗膜が生じさせるシールド効果が十分でなく、必要なシールド効果を得るためには、この塗料を複数回塗布して比較的厚い塗膜を得なければならない、未だ解決すべき課題が残存していた。また、金属粉末としてニッケル粉末を用いた場合には、そのニッケル粉末が比較的高価なため結果的に得られた導電性塗料自体が非常に高価なものとなってしまう不具合もあった。
本発明の目的は、単位厚さのシールド特性を向上し得る導電性塗料を提供することにある。
However, the above-mentioned conventional conductive paint does not have a sufficient shielding effect that a unit-thickness coating film produces, and in order to obtain a necessary shielding effect, this coating material is applied several times to form a relatively thick coating film. There were still problems to be solved that had to be obtained. In addition, when nickel powder is used as the metal powder, the resulting nickel powder is relatively expensive, so that the resulting conductive coating itself is very expensive.
An object of the present invention is to provide a conductive paint capable of improving the shielding characteristics of unit thickness.
請求項１に係る発明は、水溶性エマルジョン１００重量部に、アスペクト比が２０以上１０００以下である導電性繊維が１〜２０重量部混合された導電性塗料である。
この請求項１に記載された導電性塗料では、水溶性エマルジョンに導電性繊維を混合するので、金属粉末を混合する従来の導電性塗料品に比較して、得られた塗膜中における金属物質の連鎖が向上し、単位厚さ当たりのシールド効果を向上させることができる。
請求項２に係る発明は、請求項１に係る発明であって、導電性繊維が銀メッキ繊維または炭素繊維である導電性塗料である。
この請求項２に記載された導電性塗料では、導電性繊維である銀メッキ繊維または炭素繊維はニッケル粉末に比較して安価であり、ニッケル粉末を混合する従来の導電性塗料に比較して得られた導電性塗料の単価を安価にすることができる。
The invention according to claim 1 is a conductive paint in which 1 to 20 parts by weight of conductive fibers having an aspect ratio of 20 or more and 1000 or less are mixed with 100 parts by weight of a water-soluble emulsion.
In the conductive paint described in claim 1, since conductive fibers are mixed in a water-soluble emulsion, the metal substance in the obtained coating film is compared with a conventional conductive paint product in which metal powder is mixed. As a result, the shielding effect per unit thickness can be improved.
The invention according to claim 2 is the invention according to claim 1, wherein the conductive fiber is a silver-plated fiber or a carbon fiber.
In the conductive paint described in claim 2, silver-plated fiber or carbon fiber, which is a conductive fiber, is cheaper than nickel powder, and is obtained compared with a conventional conductive paint mixed with nickel powder. The unit price of the obtained conductive paint can be reduced.
本発明の導電性塗料では、水溶性エマルジョン１００重量部に、アスペクト比が２０以上１０００以下である導電性繊維を１〜２０重量部混合するため、金属粉末を混合する従来の導電性塗料品に比較して、得られた塗膜中における金属物質の連鎖を向上させて、単位厚さ当たりのシールド効果を向上させることができる。そして、導電性繊維として比較的安価な銀メッキ繊維または炭素繊維を用いることにより、粉末を混合する従来の導電性塗料に比較して得られた導電性塗料の単価を安価にすることができる。 In the conductive paint of the present invention, 1 to 20 parts by weight of conductive fibers having an aspect ratio of 20 or more and 1000 or less are mixed with 100 parts by weight of a water-soluble emulsion, so that a conventional conductive paint product in which metal powder is mixed is used. In comparison, it is possible to improve the shielding effect per unit thickness by improving the chain of metal substances in the obtained coating film. Then, by using relatively inexpensive silver-plated fiber or carbon fiber as the conductive fiber, the unit price of the conductive paint obtained compared to the conventional conductive paint in which powder is mixed can be reduced.
次に本発明を実施するための最良の形態を説明する。
本発明は、通常の内装及び外装用の塗料である水溶性エマルジョンに導電性繊維を含有するように構成した導電性塗料である。そしてその比率は、水溶性エマルジョン１００重
量部に、導電性繊維を１〜２０重量部混合する。ここで、水溶性エマルジョンとしては、通常屋内塗料に多く用いられる酢酸ビニル系共重合体やアクリル樹脂の他、スチレンブタジエン共重合体等が挙げられ、低粘度であることが塗装の作業性や導電性繊維の分散性の点で更に好ましい。
Next, the best mode for carrying out the present invention will be described.
The present invention is a conductive paint configured to contain conductive fibers in a water-soluble emulsion which is a paint for interior and exterior use. And the ratio mixes 1-20 weight part of conductive fibers with 100 weight part of water-soluble emulsion. Examples of water-soluble emulsions include vinyl acetate copolymers and acrylic resins that are usually used in many indoor paints, as well as styrene butadiene copolymers. It is further preferable in terms of dispersibility of the conductive fiber.
また、水溶性エマルジョンに混合する導電性繊維を１〜２０重量部に限定するのは、導電性繊維が１重量部未満であると十分な導電性を得ることが困難になり、２０重量部を越えると得られた塗料の粘性が上昇して得られた塗料の塗布作業が困難になる。なお、導電性繊維の混合比率は、適正な粘度と得られる導電性とのバランスから５〜１０重量部であることが好ましく、８〜１０重量部であることが更に好ましい。
また、導電性繊維は、そのアスペクト比が２０以上１０００以下であるものが用いられる。ここで、導電性繊維のアスペクト比を２０以上１０００以下とするのは、アスペクト比が２０未満であると十分な導電性を得ること困難になり、１０００を越えるとその繊維を得ることが困難になるからである。導電性繊維の更に好ましいアスペクト比は２０以上２００以下である。
Moreover, it is difficult to obtain sufficient conductivity if the conductive fiber is less than 1 part by weight, because the conductive fiber mixed in the water-soluble emulsion is limited to 1 to 20 parts by weight. If it exceeds, the viscosity of the resulting paint will increase, making it difficult to apply the obtained paint. The mixing ratio of the conductive fibers is preferably 5 to 10 parts by weight, and more preferably 8 to 10 parts by weight, from the balance between the appropriate viscosity and the obtained conductivity.
In addition, conductive fibers having an aspect ratio of 20 or more and 1000 or less are used. Here, when the aspect ratio of the conductive fiber is 20 or more and 1000 or less, it is difficult to obtain sufficient conductivity when the aspect ratio is less than 20, and it is difficult to obtain the fiber when the aspect ratio exceeds 1000. Because it becomes. A more preferable aspect ratio of the conductive fiber is 20 or more and 200 or less.
更に、導電性繊維は銀メッキ繊維または炭素繊維であることが好ましい。これらは比較的安価に入手しうることから好ましい。ここで、銀メッキ繊維は、有機繊維に銀メッキを施すことが好ましい。有機繊維とは天然及び合成の有機物の繊維、即ち綿、麻、再生セルロース、ポリアミド、アクリル、ポリオレフィン、ポリエステル等の繊維である。この有機繊維の太さは０．１〜１５ｄ（ｄ＝デニール）で、０．１ｄより細いと、金属の被覆量を多く必要とし、比重も大きくなり、また１５ｄより太いと、金属の被覆量は減らせるけれども、繊維が堅くなり得られた塗料の塗布作業性が劣ることになる。金属である銀を被覆する方法は、無電解メッキ法でその他の方法として真空蒸着法等があるが、無電解メッキ法が量産性に優れていて好ましい。金属である銀の被覆量は５〜５０重量％で、５重量％より少ないと繊維を十分に被覆することができず、導電性が悪くなり、５０重量％を越えると比重が大きくなる。 Furthermore, the conductive fibers are preferably silver-plated fibers or carbon fibers. These are preferable because they can be obtained relatively inexpensively. Here, the silver-plated fiber is preferably subjected to silver plating on the organic fiber. Organic fibers are natural and synthetic organic fibers, that is, fibers such as cotton, hemp, regenerated cellulose, polyamide, acrylic, polyolefin, polyester, and the like. The thickness of the organic fiber is 0.1 to 15d (d = denier), and if it is thinner than 0.1d, a large amount of metal coating is required, the specific gravity is increased, and if it is thicker than 15d, the metal coating amount is large. However, the coating workability of the resulting paint becomes inferior. As a method for coating silver which is a metal, there is an electroless plating method, and other methods include a vacuum deposition method, but the electroless plating method is preferable because it is excellent in mass productivity. The coating amount of silver, which is a metal, is 5 to 50% by weight, and if it is less than 5% by weight, the fibers cannot be sufficiently coated, resulting in poor conductivity, and if it exceeds 50% by weight, the specific gravity increases.
このように構成された本発明の導電性塗料では、スプレーによる吹き付け塗装、又はローラーでの塗装を可能とし、従来の導電性金属箔テープを用いるには適さなかった広範囲にわたる補修または対策が可能にするものである。また、スプレーで吹き付けることにより、凹凸や曲面、手の入らない隙間及びコーナー部分への使用も導電性金属箔テープに比べ、非常に容易に行うことができるものである。この塗料は塗布後、室温の約２６℃で乾燥される。 The conductive paint of the present invention configured as described above enables spray painting by spraying or painting with a roller, and enables a wide range of repairs or countermeasures not suitable for using conventional conductive metal foil tape. To do. Moreover, by spraying, it can be used very easily compared with the conductive metal foil tape, as compared with the conductive metal foil tape. After coating, the paint is dried at about 26 ° C. at room temperature.
また本発明の導電性塗料では、導電性の繊維を使用することによって、得られた塗膜が非常に優れた導電性を有することになる。即ち、塗膜の導電性能はその塗膜中に含まれる導電性成分の体積的な比率に依存するため、従来用いられていた金属粉末はその姿がフレーク状であっても体積が小さいため、目標とする導電性能を得るためには上記に挙げた通り、樹脂成分の重量に対し、数倍の量が必要となっていた。こらに対して導電性繊維を混合した本発明では、その長さを調節することで、樹脂成分との体積比率が同等あるいはそれ以上となり、結果的に非常に少ない添加量で、高い導電性能を持たせることが可能となる。 Moreover, in the conductive paint of this invention, the obtained coating film has the very outstanding electroconductivity by using a conductive fiber. That is, since the conductive performance of the coating film depends on the volume ratio of the conductive component contained in the coating film, the metal powder that has been used conventionally has a small volume even if its shape is flaky, In order to obtain the target conductive performance, an amount several times as large as the weight of the resin component is necessary as described above. In the present invention in which conductive fibers are mixed, the volume ratio with the resin component becomes equal or more by adjusting the length, resulting in high conductive performance with a very small addition amount. It becomes possible to have.
次に本発明の実施例を説明する。
＜実施例１＞
塗料ベースエマルジョン（旭化成株式会社製DL-612）にアスペクト比が２０である炭素繊維および粘度調整剤を撹拌しながら少量づつ添加し、エマルジョンと炭素繊維の混合物からなる導電性塗料を得た。この時のエマルジョンと炭素繊維は重量比で１０：１となるようにした。この作製物をスプレーガンにより厚さ１２ｍｍであって、外形が７００×７００ｍｍの合板の表面に塗布乾燥させた後、その得られた塗膜の厚さと表面電気抵抗値を測定した。その結果、塗膜の厚さは０．２ｍｍであって、電気抵抗値は２×１０0Ωであった。
次に電波シールド性能を測定した。電磁波シールド測定室に設けた７１０×７１０ｍｍの開口部分に、この塗料を塗布した合板を取り付け、未塗布の合板を取り付けた場合との開口部分を透過する電波レベルの差から、開発した導電性塗料のシールド性能を測定した。測定には発信側、受信側共にログペリ型のアンテナを使用しスペクトルアナライザのトラッキングジェネレータを使い、周波数が４００ＭＨｚから３ＧＨｚまでの電波を連続で発生させるようにした。測定周波数を４００ＭＨｚとしたのは、開口部分の面積と電波の波長を考慮したものである。
その結果、塗料のシールド性能としては、非常に高い、５５ｄＢ（周波数４００ＭＨｚ−３ＧＨｚ）という性能を得た。
Next, examples of the present invention will be described.
<Example 1>
Carbon fiber having an aspect ratio of 20 and a viscosity modifier were added little by little to a paint base emulsion (DL-612 manufactured by Asahi Kasei Co., Ltd.) with stirring to obtain a conductive paint comprising a mixture of emulsion and carbon fiber. At this time, the emulsion and carbon fiber were adjusted to have a weight ratio of 10: 1. This product was applied to and dried on the surface of a plywood having a thickness of 12 mm and an outer shape of 700 × 700 mm by a spray gun, and the thickness and surface electric resistance value of the obtained coating film were measured. As a result, the thickness of the coating film was 0.2 mm, and the electric resistance value was 2 × 10 0 Ω.
Next, radio wave shielding performance was measured. Developed conductive paint from the difference in radio wave level transmitted through the opening part when the plywood coated with this paint is attached to the opening part of 710 x 710 mm provided in the electromagnetic shielding measurement room and uncoated plywood is attached The shielding performance of was measured. For the measurement, a log-peri type antenna was used on both the transmitting side and the receiving side, and a tracking generator of a spectrum analyzer was used to continuously generate radio waves with frequencies from 400 MHz to 3 GHz. The measurement frequency is set to 400 MHz in consideration of the area of the opening and the wavelength of the radio wave.
As a result, a very high performance of 55 dB (frequency 400 MHz-3 GHz) was obtained as the shielding performance of the paint.
＜実施例２＞
実施例１と同様の方法で、エマルジョンと銀メッキ繊維を混合した導電性塗料を得た。その時の銀メッキ繊維のアスペクト比は２０で、エマルジョンとの混合比は１０：１である。そして、実施例１と同様に得られた導電性塗料を合板に塗布乾燥させた後、得られた塗膜の厚さと表面電気抵抗値、及びシールド性能を実施例１と同様に測定した。その結果、塗膜の厚さは０．２ｍｍであって、電気抵抗値は６×１０-1Ωであった。そしてそのシールド性能は実施例１を上回る６０ｄBであった。
<Example 2>
In the same manner as in Example 1, a conductive paint in which an emulsion and silver-plated fibers were mixed was obtained. The aspect ratio of the silver-plated fiber at that time is 20, and the mixing ratio with the emulsion is 10: 1. And after apply | coating and drying the conductive coating material obtained similarly to Example 1 on the plywood, the thickness of the obtained coating film, the surface electrical resistance value, and the shielding performance were measured similarly to Example 1. FIG. As a result, the thickness of the coating film was 0.2 mm, and the electric resistance value was 6 × 10 −1 Ω. The shield performance was 60 dB, exceeding that of Example 1.
＜比較例１＞
実施例１と同様の方法で、エマルジョンにＮｉ粉末を混合した導電性塗料を得た。この時のエマルジョンとＮｉ粉末の重量比は１：３となるようにした。そして、実施例１と同様に得られた導電性塗料を合板に塗布乾燥させた後、得られた塗膜の厚さと表面電気抵抗値、及びシールド性能を実施例１と同様に測定した。その結果、塗膜の厚さは０．２ｍｍであって、表面電気抵抗値は１×１０4Ωという結果であった。そしてその電磁波シールド性能は１５ｄBであった。
<Comparative Example 1>
In the same manner as in Example 1, a conductive paint in which Ni powder was mixed with the emulsion was obtained. At this time, the weight ratio of the emulsion to the Ni powder was set to 1: 3. And after apply | coating and drying the conductive coating material obtained similarly to Example 1 on the plywood, the thickness of the obtained coating film, the surface electrical resistance value, and the shielding performance were measured similarly to Example 1. FIG. As a result, the thickness of the coating film was 0.2 mm, and the surface electric resistance value was 1 × 10 4 Ω. The electromagnetic wave shielding performance was 15 dB.
＜評価＞
実施例１の導電性塗料では、得られた塗膜により２×１０0Ωという表面電気抵抗値が得られた。また実施例２の導電性塗料では、得られた塗膜により６×１０-1Ωという表面電気抵抗値が得られた。一方、Ｎｉ粉末を混合した比較例１では得られた塗膜の表面電気抵抗値は著しく高い１×１０4Ωである。従って、これらの結果からしても、本発明の導電性塗料は、塗布乾燥させることにより電波シールド材料として十分に使用できる塗膜を得ることができることが判る。また本発明品は、従来の内外装用塗料と同様の現場用途布機械が使用できるため、取扱いも容易である。
<Evaluation>
In the conductive paint of Example 1, a surface electrical resistance value of 2 × 10 0 Ω was obtained by the obtained coating film. Further, in the conductive paint of Example 2, a surface electric resistance value of 6 × 10 −1 Ω was obtained by the obtained coating film. On the other hand, in Comparative Example 1 in which Ni powder was mixed, the surface electrical resistance value of the obtained coating film was remarkably high 1 × 10 4 Ω. Therefore, even from these results, it can be seen that the conductive paint of the present invention can provide a coating film that can be sufficiently used as a radio wave shielding material by coating and drying. The product of the present invention can also be handled easily because it can be used in a field-use cloth machine similar to conventional interior and exterior paints.
Claims (2)
2. The conductive paint according to claim 1, wherein the conductive fiber is silver-plated fiber or carbon fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2004093968A JP2005281357A (en) | 2004-03-29 | 2004-03-29 | Conductive coating |
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| JP2004093968A JP2005281357A (en) | 2004-03-29 | 2004-03-29 | Conductive coating |
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| JP (1) | JP2005281357A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8018568B2 (en) | 2006-10-12 | 2011-09-13 | Cambrios Technologies Corporation | Nanowire-based transparent conductors and applications thereof |
| US8018563B2 (en) | 2007-04-20 | 2011-09-13 | Cambrios Technologies Corporation | Composite transparent conductors and methods of forming the same |
| US8049333B2 (en) | 2005-08-12 | 2011-11-01 | Cambrios Technologies Corporation | Transparent conductors comprising metal nanowires |
| US8094247B2 (en) | 2006-10-12 | 2012-01-10 | Cambrios Technologies Corporation | Nanowire-based transparent conductors and applications thereof |
| US9534124B2 (en) | 2010-02-05 | 2017-01-03 | Cam Holding Corporation | Photosensitive ink compositions and transparent conductors and method of using the same |
| JP7429530B2 (en) | 2019-01-08 | 2024-02-08 | 中国塗料株式会社 | Radio wave absorbing paint composition, radio wave absorbing paint film, base material with radio wave absorbing paint film, and method for producing the base material with radio wave absorbing paint film |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8049333B2 (en) | 2005-08-12 | 2011-11-01 | Cambrios Technologies Corporation | Transparent conductors comprising metal nanowires |
| US8618531B2 (en) | 2005-08-12 | 2013-12-31 | Cambrios Technologies Corporation | Transparent conductors comprising metal nanowires |
| US8865027B2 (en) | 2005-08-12 | 2014-10-21 | Cambrios Technologies Corporation | Nanowires-based transparent conductors |
| US9899123B2 (en) | 2005-08-12 | 2018-02-20 | Jonathan S. Alden | Nanowires-based transparent conductors |
| US8018568B2 (en) | 2006-10-12 | 2011-09-13 | Cambrios Technologies Corporation | Nanowire-based transparent conductors and applications thereof |
| US8094247B2 (en) | 2006-10-12 | 2012-01-10 | Cambrios Technologies Corporation | Nanowire-based transparent conductors and applications thereof |
| US8174667B2 (en) | 2006-10-12 | 2012-05-08 | Cambrios Technologies Corporation | Nanowire-based transparent conductors and applications thereof |
| US8760606B2 (en) | 2006-10-12 | 2014-06-24 | Cambrios Technologies Corporation | Nanowire-based transparent conductors and applications thereof |
| US10749048B2 (en) | 2006-10-12 | 2020-08-18 | Cambrios Film Solutions Corporation | Nanowire-based transparent conductors and applications thereof |
| US8018563B2 (en) | 2007-04-20 | 2011-09-13 | Cambrios Technologies Corporation | Composite transparent conductors and methods of forming the same |
| US9534124B2 (en) | 2010-02-05 | 2017-01-03 | Cam Holding Corporation | Photosensitive ink compositions and transparent conductors and method of using the same |
| JP7429530B2 (en) | 2019-01-08 | 2024-02-08 | 中国塗料株式会社 | Radio wave absorbing paint composition, radio wave absorbing paint film, base material with radio wave absorbing paint film, and method for producing the base material with radio wave absorbing paint film |
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