JP2003158395A - Electromagnetic wave absorbing material - Google Patents
Electromagnetic wave absorbing materialInfo
- Publication number
- JP2003158395A JP2003158395A JP2001357673A JP2001357673A JP2003158395A JP 2003158395 A JP2003158395 A JP 2003158395A JP 2001357673 A JP2001357673 A JP 2001357673A JP 2001357673 A JP2001357673 A JP 2001357673A JP 2003158395 A JP2003158395 A JP 2003158395A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic wave
- wave absorbing
- absorbing material
- nano
- resin
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電磁波吸収材料及
びこれを用いた電磁波吸収材に関する。より詳細には、
主に、１〜２０ＧＨｚ付近の広い周波数領域において、
特に好適に用いられる電磁波吸収材料及びこれを用いた
電磁波吸収材に関する。TECHNICAL FIELD The present invention relates to an electromagnetic wave absorbing material and an electromagnetic wave absorbing material using the same. More specifically,
Mainly in a wide frequency range around 1 to 20 GHz,
The present invention particularly relates to an electromagnetic wave absorbing material and an electromagnetic wave absorbing material using the same.
【０００２】[0002]
【従来の技術】近年、携帯型電話機をはじめ、様々な電
子通信機器の普及に伴って、電磁波ノイズによる電気・
電子機器の誤作動、情報の漏洩等、いわゆる電波障害の
問題が深刻になってきている。このため、不要な電磁波
を吸収して熱エネルギーに変換する電磁波吸収材への期
待が高まっている。2. Description of the Related Art In recent years, with the widespread use of various electronic communication devices such as mobile phones, electric power due to electromagnetic noise
The problem of so-called radio interference such as malfunction of electronic devices and leakage of information has become serious. For this reason, expectations for electromagnetic wave absorbers that absorb unnecessary electromagnetic waves and convert them into heat energy are increasing.
【０００３】既に、種々の電磁波吸収材が開発、実用化
されている。例えば、特開平8-172292号公報には、ゴム
100重量部に対して、ファーネスブラック３０〜６０重
量部と、繊維径１０〜２０μｍ、繊維長０．３〜１ｍｍ
の炭素繊維短繊維５〜２０重量部とを配合した、特にＰ
ＨＳ（Personal Handy-phone System）帯域である周波
数１．８〜２ＧＨｚの電磁波に有効な、電磁波吸収材が
記載されている。Various electromagnetic wave absorbing materials have already been developed and put into practical use. For example, in Japanese Patent Laid-Open No. 8-172292, rubber is used.
Furnace black 30 to 60 parts by weight, fiber diameter 10 to 20 μm, fiber length 0.3 to 1 mm per 100 parts by weight
5 to 20 parts by weight of carbon fiber, especially P
An electromagnetic wave absorbing material effective for an electromagnetic wave having a frequency of 1.8 to 2 GHz in the HS (Personal Handy-phone System) band is described.
【０００４】また、特開平10-27986号公報には、カーボ
ンブラックと、繊維径０．１〜５０μｍ、繊維長１μｍ
〜５ｍｍの炭素繊維を合計で８０重量%以下となるよう
に配合した、特に１〜４ＧＨｚの電波に有効な電磁波吸
収材が開示されている。Further, in Japanese Patent Laid-Open No. 10-27986, carbon black, a fiber diameter of 0.1 to 50 μm and a fiber length of 1 μm are disclosed.
Disclosed is an electromagnetic wave absorber containing carbon fibers of -5 mm in a total amount of 80% by weight or less, which is particularly effective for radio waves of 1 to 4 GHz.
【０００５】さらに、特開2001-22349号公報には、樹脂
１００重量部に対してカーボンブラックを５〜１０重量
部と、繊維径０．１〜１μｍ、繊維長１００μｍ以下の
気相成長炭素繊維１〜１０重量部とを配合した、周波数
１〜２０ＧＨｚの広い範囲の電磁波に有効な電磁波吸収
材が記載されている。Further, in Japanese Patent Laid-Open No. 2001-22349, 5 to 10 parts by weight of carbon black is added to 100 parts by weight of resin, a fiber diameter is 0.1 to 1 μm, and a fiber length is 100 μm or less. 1 to 10 parts by weight of an electromagnetic wave absorbing material effective for a wide range of electromagnetic waves having a frequency of 1 to 20 GHz is described.
【０００６】[0006]
【発明が解決しようとする課題】上記のように、従来の
電磁波吸収材は、樹脂にカーボンブラックや炭素繊維を
配合し、混練して得られる樹脂組成物をシート状等に成
形して製造される。しかしながら、上記従来の電磁波吸
収材は、使用されている繊維径が比較的大きく（０．１
μｍ以上）、繊維長も長い（１００μｍ）ため、充填密
度が低く、充分な電磁波吸収能を得るためには、繊維と
カーボンブラックとを大量に配合しなければならない。As described above, the conventional electromagnetic wave absorber is produced by blending resin with carbon black or carbon fibers and kneading the resulting resin composition to form a sheet or the like. It However, the above conventional electromagnetic wave absorber has a relatively large fiber diameter (0.1%).
.mu.m or more) and the fiber length is long (100 .mu.m), the packing density is low, and a large amount of fibers and carbon black must be blended in order to obtain sufficient electromagnetic wave absorbing ability.
【０００７】また、従来より用いられている電磁波吸収
材では、ＰＨＳ帯や、Ｌ帯、Ｓ帯に対する電磁波吸収能
を有するものの、それより高い周波数域については、そ
の効果が不明である。一方で、船舶用あるいは飛行機用
レーダーの電波の吸収用材料や、無線通信等の応用分野
は、今後益々広がり、それに伴って、使用される電波も
より高周波域へと移行することが十分に予測される。に
もかかわらず、上記のような電波の吸収用材料を含め
て、このような高周波域での使用に適した電磁波吸収材
は、現時点、見出されていない。Further, although the electromagnetic wave absorbers used conventionally have an electromagnetic wave absorbing ability for the PHS band, L band and S band, the effect is unclear in the higher frequency range. On the other hand, the fields of application for absorbing radio waves from radars for ships and airplanes, and the fields of application such as wireless communications will continue to expand, and it is sufficiently predicted that the radio waves used will shift to higher frequencies. To be done. Nevertheless, at present, no electromagnetic wave absorbing material suitable for use in such a high frequency region has been found, including the above-mentioned electromagnetic wave absorbing materials.
【０００８】本発明は以上のような状況に鑑みてなされ
たものであり、その目的は１〜２０ＧＨｚ範囲という広
い周波数領域において高電磁波吸収能を発現し、かつ、
柔軟性、加工性、施工性にも優れた電磁波吸収材料及び
これを用いた電磁波吸収材を提供することにある。The present invention has been made in view of the above situation, and an object thereof is to exhibit a high electromagnetic wave absorbing ability in a wide frequency range of 1 to 20 GHz, and
An object is to provide an electromagnetic wave absorbing material excellent in flexibility, workability, and workability, and an electromagnetic wave absorbing material using the same.
【０００９】[0009]
【課題を解決するための手段】本願発明者等は、上記目
的を達成するために鋭意検討した。その結果、フラーレ
ンやカーボンナノチューブ等のナノサイズ炭素材料を使
用することにより、炭素繊維及びカーボンブラック等を
用いなくても、従来と同等以上の電磁波吸収能が得られ
ることを見出し、本発明を完成するに至った。Means for Solving the Problems The inventors of the present application have made extensive studies in order to achieve the above object. As a result, they have found that by using a nano-sized carbon material such as fullerene or carbon nanotube, it is possible to obtain an electromagnetic wave absorption capacity equal to or higher than the conventional one without using carbon fiber and carbon black, and the present invention is completed. Came to do.
【００１０】すなわち、請求項１に記載の電磁波吸収材
料は、上記の課題を解決するために、樹脂とナノサイズ
炭素材料とを含むことを特徴としている。That is, the electromagnetic wave absorbing material described in claim 1 is characterized by containing a resin and a nano-sized carbon material in order to solve the above problems.
【００１１】上記の構成によれば、高周波帯域を含む１
〜２０ＧＨｚの広い範囲で優れた電磁波吸収能を有する
ナノサイズ炭素材料を含むことで、少量のナノサイズ炭
素材料で充分な電磁波吸収能を有する電磁波吸収材料を
得ることができる。このため、樹脂本来の特性を阻害す
ることなく、ナノサイズ炭素材料を樹脂中に分散させる
ことができる。また、特殊形状を有するナノサイズ炭素
材料を用いていることで、従来の電磁波吸収材料のよう
に、カーボンブラック等の別物質を混合する必要がな
い。このため、少なくともナノサイズ炭素材料という1
種類の物質のみ配合すればよいので、製造コストを低減
し製造工程を簡略化でき、柔軟性、加工性、施工性に優
れた電磁波吸収材料を得ることができる。According to the above configuration, the high frequency band 1
By including the nano-sized carbon material having excellent electromagnetic wave absorbing ability in a wide range of ˜20 GHz, an electromagnetic wave absorbing material having sufficient electromagnetic wave absorbing ability can be obtained with a small amount of nano-sized carbon material. Therefore, the nano-sized carbon material can be dispersed in the resin without impairing the original properties of the resin. Further, since the nano-sized carbon material having the special shape is used, it is not necessary to mix another substance such as carbon black as in the conventional electromagnetic wave absorbing material. Therefore, at least one nano-sized carbon material
Since only the substances of different types need to be blended, the manufacturing cost can be reduced, the manufacturing process can be simplified, and an electromagnetic wave absorbing material excellent in flexibility, workability, and workability can be obtained.
【００１２】請求項２に記載の電磁波吸収材料は、上記
の課題を解決するために、樹脂100重量部に対して、ナ
ノサイズ炭素材料が１〜１０重量部の割合で配合されて
いることを特徴としている。In order to solve the above-mentioned problems, the electromagnetic wave absorbing material according to the second aspect contains 100 parts by weight of the resin and 1 to 10 parts by weight of the nano-sized carbon material. It has a feature.
【００１３】上記の構成によれば、ナノサイズ炭素材料
が上記割合で配合されていることで、電磁波吸収性を保
持しつつ、かつ、樹脂中での該炭素材料の分散性をも得
ることができるので、より優れた電磁波吸収能を発現
し、かつ、柔軟性、加工性、施工性にも優れた電磁波吸
収材料を得ることができる。According to the above construction, the nano-sized carbon material is blended in the above proportion, whereby the electromagnetic wave absorption can be maintained and the dispersibility of the carbon material in the resin can be obtained. Therefore, it is possible to obtain an electromagnetic wave absorbing material exhibiting more excellent electromagnetic wave absorbing ability and excellent in flexibility, processability, and workability.
【００１４】請求項３に記載の電磁波吸収材料は、上記
の課題を解決するために、前記ナノサイズ炭素材料が、
直径１〜１００ｎｍ、長さ５０μｍ以下のカーボンナノ
チューブであることを特徴としている。In order to solve the above-mentioned problems, an electromagnetic wave absorbing material according to a third aspect of the present invention comprises:
It is characterized in that it is a carbon nanotube having a diameter of 1 to 100 nm and a length of 50 μm or less.
【００１５】請求項４に記載の電磁波吸収材料は、上記
の課題を解決するために、前記ナノサイズ炭素材料が、
フラーレン及びカーボンナノチューブの少なくともいず
れかを含むことを特徴としている。In order to solve the above problems, the electromagnetic wave absorbing material according to claim 4 is characterized in that the nano-sized carbon material is
It is characterized by containing at least one of fullerene and carbon nanotube.
【００１６】上記の構成によれば、ナノサイズ炭素材料
が上記カーボンナノチューブあるいはフラーレンである
ことで、微小でありながら優れた電磁波吸収性を発揮す
ることができるので、樹脂中での分散性もよく、柔軟
性、加工性、施工性により優れた電磁波吸収材料を得る
ことができる。According to the above constitution, since the nano-sized carbon material is the above-mentioned carbon nanotube or fullerene, it is possible to exhibit excellent electromagnetic wave absorbing property even though it is minute, so that the dispersibility in the resin is also good. It is possible to obtain an electromagnetic wave absorbing material excellent in flexibility, workability, and workability.
【００１７】請求項５に記載の電磁波吸収材は、上記の
課題を解決するために、請求項１ないし４のいずれか1
項に記載の電磁波吸収材料を成形してなることを特徴と
している。In order to solve the above-mentioned problems, the electromagnetic wave absorber according to claim 5 is one of the electromagnetic wave absorbers according to any one of claims 1 to 4.
It is characterized by being formed by molding the electromagnetic wave absorbing material described in the item.
【００１８】上記の構成によれば、上記電磁波吸収材料
を成形してなることで、１〜２０ＧＨｚ範囲という広い
周波数領域において高電磁波吸収能を発現し、かつ、柔
軟性、加工性、施工性にも優れた電磁波吸収材を得るこ
とができる。According to the above construction, by molding the electromagnetic wave absorbing material, a high electromagnetic wave absorbing ability is exhibited in a wide frequency range of 1 to 20 GHz, and flexibility, workability and workability are improved. It is also possible to obtain an excellent electromagnetic wave absorber.
【００１９】[0019]
【発明の実施の形態】本発明の一実施形態について、図
面に基づいて説明すれば以下のとおりである。本発明の
電磁波吸収材料は、樹脂とナノサイズ炭素材料とを含ん
でいる。本発明の電磁波吸収材料は、特殊形状をもつナ
ノサイズ炭素材料を含んでいるので、例えばカーボンブ
ラック等の別の物質をさらに含まなくても、充分に電磁
波吸収性を発現することができる。このため、本発明の
電磁波吸収材料は、電磁波吸収性物質としてナノサイズ
炭素材料が用いられ、カーボンブラックを含まない構成
とすることができる。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The electromagnetic wave absorbing material of the present invention contains a resin and a nano-sized carbon material. Since the electromagnetic wave absorbing material of the present invention contains the nano-sized carbon material having a special shape, the electromagnetic wave absorbing material can sufficiently exhibit electromagnetic wave absorbability without further containing another substance such as carbon black. Therefore, the electromagnetic wave absorbing material of the present invention can be configured to use a nano-sized carbon material as an electromagnetic wave absorbing substance and not contain carbon black.
【００２０】本発明において、樹脂の種類は、特に限定
されるものではなく、用途に応じた物性、例えば、強度
や耐熱性、成形性等を考慮して適宜選択される。In the present invention, the type of resin is not particularly limited, and is appropriately selected in consideration of the physical properties according to the application, such as strength, heat resistance, moldability and the like.
【００２１】具体的には、例えば、エチレン―プロピレ
ン―ターポリマーゴム（ＥＰＴ）、クロロプレンゴム、
アクリロニトリル―ブタジエンゴム、スチレン―ブタジ
エンゴム、天然ゴム、ポリイソプレンゴム、クロロスル
ホン化ポリエチレンゴム、塩素化ポリエチレンゴム、エ
チレン―α―オレフィンゴム、エチレン―プロピレンゴ
ム、シリコーンゴム、アクリルゴム、フッ素ゴム等の各
種エラストマー；エチレン―アクリル酸エステル共重合
体、ポリオレフィン樹脂、塩化ビニリデン樹脂、ポリア
ミド樹脂、ポリエーテルケトン樹脂、塩化ビニル樹脂、
ポリエステル樹脂、アルキド樹脂、フェノール樹脂、エ
ポキシ樹脂、アクリル樹脂、ウレタン樹脂、シリコーン
樹脂、セルロース樹脂、酢酸ビニル樹脂、尿素樹脂、ポ
リカーボネート樹脂等が挙げられる。これらは、1種類
のみで用いても、2種以上を混合して用いてもよい。Specifically, for example, ethylene-propylene-terpolymer rubber (EPT), chloroprene rubber,
Acrylonitrile-butadiene rubber, styrene-butadiene rubber, natural rubber, polyisoprene rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, ethylene-α-olefin rubber, ethylene-propylene rubber, silicone rubber, acrylic rubber, fluorine rubber, etc. Various elastomers; ethylene-acrylic acid ester copolymer, polyolefin resin, vinylidene chloride resin, polyamide resin, polyetherketone resin, vinyl chloride resin,
Examples thereof include polyester resin, alkyd resin, phenol resin, epoxy resin, acrylic resin, urethane resin, silicone resin, cellulose resin, vinyl acetate resin, urea resin and polycarbonate resin. These may be used alone or in combination of two or more.
【００２２】上記例示の樹脂のうち、長期耐候性の観点
からは、ＥＰＴが特に好ましい。その他、例えば、エチ
レン―アクリル酸エステル共重合体等の熱可塑性樹脂、
エポキ樹脂等の熱硬化性樹脂等が好ましい。Among the resins exemplified above, EPT is particularly preferable from the viewpoint of long-term weather resistance. In addition, for example, a thermoplastic resin such as ethylene-acrylic acid ester copolymer,
Thermosetting resins such as epoxy resin are preferable.
【００２３】本発明の電磁波吸収材料は、従来の、炭素
繊維とカーボンブラックとの混合物等に替えて、ナノサ
イズ炭素材料を電波吸収性物質として主に用いることを
特徴とする。本発明に係るナノサイズ炭素材料とは、直
径１〜１００ｎｍ程度の、又はフラーレンＣ60 分子程
度のナノサイズの大きさを有する炭素材料をいう。本発
明に係るカーボンナノチューブは、単層または多層から
なり、そのサイズは特に限定されないが、通常、直径１
〜１００ｎｍ、長さ５０μｍ以下の範囲内である。The electromagnetic wave absorbing material of the present invention is characterized in that a nano-sized carbon material is mainly used as an electromagnetic wave absorbing substance in place of the conventional mixture of carbon fiber and carbon black. The nano-sized carbon material according to the present invention means a carbon material having a diameter of about 1 to 100 nm or a nano-sized size of about fullerene C 60 molecules. The carbon nanotube according to the present invention is composed of a single layer or a multi-layer, and the size thereof is not particularly limited, but it is usually 1
˜100 nm and length within 50 μm.
【００２４】このように、ナノサイズ炭素材料は、他の
炭素材料又は気相成長炭素繊維等と比較して、格段に微
細な材料である。このため、樹脂中に分散させた場合、
少ない配合量にも関わらす、分子レベルのスケールでナ
ノサイズ炭素材料同士の接触点が多くなり、高い電磁波
吸収能を得ることができる。As described above, the nano-sized carbon material is a material which is remarkably finer than other carbon materials or vapor grown carbon fibers. Therefore, when dispersed in resin,
In spite of a small blending amount, the number of contact points between nano-sized carbon materials increases on a molecular scale, and high electromagnetic wave absorbing ability can be obtained.
【００２５】本発明の電磁波吸収材料は、上記樹脂１０
０重量部に対して、上記ナノサイズ炭素材料が１〜１０
重量部の割合で配合されていることが好ましく、１〜８
重量部の割合であることがより好ましい。The electromagnetic wave absorbing material of the present invention is the above resin 10
The nano-sized carbon material is 1 to 10 parts by weight with respect to 0 parts by weight.
It is preferably blended in a ratio of 1 part by weight, 1 to 8
More preferably, it is a part by weight.
【００２６】ナノサイズ炭素材料の配合割合が、１重量
部未満であると、充分な電波吸収性が得られないおそれ
があり、１０重量部を超えると分散性が低下するおそれ
がある。If the blending ratio of the nano-sized carbon material is less than 1 part by weight, sufficient radio wave absorption may not be obtained, and if it exceeds 10 parts by weight, dispersibility may decrease.
【００２７】上記カーボンナノチューブは、例えば、以
下のような方法により製造することができる。すなわ
ち、エチレン、アセチレン等の脂肪族炭化水素を原料と
して用い、これをガス化して不活性Ｎ2、アルゴンガ
ス、又は、水素等の還元性のキャリアガスとともに６０
０℃〜１２００℃の反応帯域中に導入し、分散浮遊させ
た炭化水素分解触媒と接触させることにより得ることが
できる。The above-mentioned carbon nanotube can be manufactured, for example, by the following method. That is, an aliphatic hydrocarbon such as ethylene or acetylene is used as a raw material, and this is gasified to form 60 with an inert N 2 , argon gas or a reducing carrier gas such as hydrogen.
It can be obtained by introducing it into a reaction zone of 0 ° C to 1200 ° C, and bringing it into contact with a hydrocarbon decomposition catalyst suspended and dispersed.
【００２８】炭化水素分解触媒としては、金属微粒子、
例えば、粒径１０〜３０ｎｍの鉄やニッケル、コバルト
金属、鉄―ニッケル合金等からなる微粒子が一般的であ
る。As the hydrocarbon decomposition catalyst, fine metal particles,
For example, fine particles of iron, nickel, cobalt metal, iron-nickel alloy or the like having a particle size of 10 to 30 nm are generally used.
【００２９】上記のようにして得られたカーボンナノチ
ューブは、必要に応じて、ボールミル等、公知の粉砕機
を用いて破砕してもよい。カーボンナノチューブは、予
め破砕しておくことにより、樹脂への分散性が向上し、
短時間で、より均質な樹脂組成物を得ることができる。
さらに、必要に応じて、例えば、ＨＮＯ3処理等を行う
ことにより、カーボンナノチューブに官能基を導入し、
これにより、分散性をより向上させる構成としてもよ
い。The carbon nanotubes obtained as described above may be crushed using a known crusher such as a ball mill, if necessary. By crushing carbon nanotubes in advance, dispersibility in resin improves,
A more homogeneous resin composition can be obtained in a short time.
Further, if necessary, for example, HNO 3 treatment is performed to introduce a functional group into the carbon nanotube,
Thereby, the dispersibility may be further improved.
【００３０】本実施の形態では、フラーレンとして市販
品純度９５%以上のものを使用したが、これに限定され
るものではない。In the present embodiment, as the fullerene, a commercial product having a purity of 95% or more is used, but the fullerene is not limited to this.
【００３１】次に、本発明の電磁波吸収材料が、従来の
電磁波吸収材料と最も異なる点につき詳述する。従来の
電磁波吸収材料では、吸収目的の電磁波に応じるため
に、炭素繊維のみならず、これに必ずカーボンブラック
を組み合わせて用いることにより、お互いの欠点を補充
する構成が一般的であった。これに対し、本発明の電磁
波吸収材料では、少量でその効果を発揮するナノサイズ
炭素材料を配合しているので、カーボンブラック等の別
物質を加える必要がなく、それのみで充分な電磁波吸収
性を発現することができる。すなわち、本発明の電磁波
吸収材料は、電磁波吸収物質としてカーボンブラック等
の別物質を主な構成要素とせず、電磁波吸収物質として
ナノサイズ炭素材料が主に用いられる構成としてもよ
い。その結果、ナノサイズ炭素材料を樹脂に少量配合し
た構成とできるので、分散性が低下することがなく、柔
軟性、加工性、施工性に優れた電磁波吸収材料を低コス
トで提供することができる。Next, the difference between the electromagnetic wave absorbing material of the present invention and the conventional electromagnetic wave absorbing material will be described in detail. In a conventional electromagnetic wave absorbing material, in order to respond to an electromagnetic wave for absorption, not only carbon fibers but also carbon black is always used in combination with each other, so that the respective defects are supplemented. On the other hand, in the electromagnetic wave absorbing material of the present invention, since a nano-sized carbon material that exerts its effect even in a small amount is blended, it is not necessary to add another substance such as carbon black, and the electromagnetic wave absorbing property alone is sufficient. Can be expressed. That is, the electromagnetic wave absorbing material of the present invention may be configured such that a nano-sized carbon material is mainly used as the electromagnetic wave absorbing substance without using another substance such as carbon black as the electromagnetic wave absorbing substance as a main constituent element. As a result, since it is possible to have a configuration in which a small amount of nano-sized carbon material is mixed with a resin, dispersibility does not decrease, and it is possible to provide an electromagnetic wave absorbing material excellent in flexibility, processability, and workability at low cost. .
【００３２】本発明の電磁波吸収材の製造方法は、特に
制限されるものではないが、例えば、樹脂にナノサイズ
炭素材料を所定量配合したものを、２本ロールミール等
の公知の混練機を用いて混練して、樹脂組成物（電磁波
吸収材料）を調製し、これを所定厚さのシート状に成形
する等により電磁波吸収材を得ることができる。The method for producing the electromagnetic wave absorbing material of the present invention is not particularly limited, but for example, a known kneader such as a two-roll mill is prepared by mixing a resin with a predetermined amount of a nano-sized carbon material. The resin composition (electromagnetic wave absorbing material) is kneaded to prepare a resin composition, and the electromagnetic wave absorbing material can be obtained by molding the resin composition into a sheet having a predetermined thickness.
【００３３】本発明の電磁波吸収材は、カーボンナノチ
ューブの配合量が少量であることから、電磁波吸収材料
の調製に際して混練に長時間を要することがなく、樹脂
中へのカーボンナノチューブの均質分散が可能となる。
また、成形条件は、従来と同様で構わないが、樹脂組成
物が低充填物であるため、流動性が高く、例えば、押出
成形を行う場合では、押し出し圧力を低減できる等、従
来よりも緩和された条件で成形することが可能である。Since the electromagnetic wave absorbing material of the present invention contains a small amount of carbon nanotubes, it does not require a long time for kneading when preparing the electromagnetic wave absorbing material, and can uniformly disperse the carbon nanotubes in the resin. Becomes
Further, the molding conditions may be the same as the conventional one, but since the resin composition is a low filling material, the fluidity is high, and for example, when performing extrusion molding, the extrusion pressure can be reduced, etc. It is possible to mold under the specified conditions.
【００３４】本発明の電磁波吸収材の形状は、特に制限
されず、用途に応じて適宜選択すればよいが、例えば、
各種成形体、シート状、塗料等として用いることができ
る。The shape of the electromagnetic wave absorbing material of the present invention is not particularly limited and may be appropriately selected depending on the application.
It can be used as various molded bodies, sheets, paints and the like.
【００３５】本発明の電磁波吸収材の用途は、特に限定
されないが、例えば、携帯電話、電子機器、家庭用ゲー
ム機、ＤＶＤ、ビデオカメラ、パーソナルコンピュータ
ー、その他、建材、自動車内装材等のほか、特に高周波
帯域での使用となる、高速道路のノンストップ自動料金
収受システムゲート用、船舶・航空機用等、あらゆる製
品に広く用いることが可能である。The use of the electromagnetic wave absorbing material of the present invention is not particularly limited, and examples thereof include mobile phones, electronic devices, home-use game machines, DVDs, video cameras, personal computers, building materials, automobile interior materials, and the like. In particular, it can be widely used for various products such as high-speed non-stop automatic toll collection system gates for ships, aircraft and aircraft, which are used in high frequency bands.
【００３６】また、本発明の電磁波吸収材を実用に供す
るには、従来の電磁波吸収材と同様に、電磁波吸収材の
片面にアルミニウムや銅等の金属板又は金属箔を貼りあ
わせるか、あるいは、金属塗料を塗布する等して、金属
との複合材とし、電磁波吸収材を、電波入射側として、
施工箇所に装着する構成としてもよい。以上のように、
本発明の電磁波吸収材料は、ナノサイズ炭素材料の配合
量が少ないことから、軽量で、柔軟性も高く、取り扱い
が容易であり、加工性も良好である。In order to put the electromagnetic wave absorbing material of the present invention into practical use, a metal plate or metal foil such as aluminum or copper is attached to one surface of the electromagnetic wave absorbing material as in the conventional electromagnetic wave absorbing material, or Apply a metal paint, etc. to make a composite material with a metal, and use an electromagnetic wave absorber as a radio wave incident side,
It may be configured to be attached to a construction site. As mentioned above,
Since the electromagnetic wave absorbing material of the present invention contains a small amount of the nano-sized carbon material, it is lightweight, has high flexibility, is easy to handle, and has good processability.
【００３７】[0037]
【実施例】以下に、実施例を挙げて本発明をより詳細に
説明するが、本発明は、これら実施例により何ら制限さ
れるものではない。The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
【００３８】〔実施例１〕ポリエチレン１００重量部に
対して、平均直径３０ｎｍ、平均長0．1μｍの多層カー
ボンナノチューブ８重量部を配合し、２本ロールミール
を用いて混練し、電磁波吸収材料を調製した。次に、こ
の電磁波吸収材料をプレスして、厚さ１．０ｍｍ、１５
０ｍｍ角のシート状に成形し、電磁波吸収材を作成し
た。次いで、得られた電磁波吸収材をアルミ箔と接合し
たものに、周波数１．０ＧＨｚ〜２０．０ＧＨｚの電波
を入射し、その反射減衰量（反射減衰,単位：dＢ）を測
定した。結果を図１に示す。図１より明らかなように、
約９．５ＧＨｚ付近に吸収ピークが見られ、その値は、
―３７ｄＢであった。Example 1 8 parts by weight of multi-walled carbon nanotubes having an average diameter of 30 nm and an average length of 0.1 μm were mixed with 100 parts by weight of polyethylene and kneaded with a two-roll mill to prepare an electromagnetic wave absorbing material. Prepared. Next, this electromagnetic wave absorbing material is pressed to give a thickness of 1.0 mm, 15
It was molded into a sheet of 0 mm square to prepare an electromagnetic wave absorber. Next, a radio wave having a frequency of 1.0 GHz to 20.0 GHz was incident on the obtained electromagnetic wave absorber joined to an aluminum foil, and the reflection attenuation amount (reflection attenuation, unit: dB) was measured. The results are shown in Fig. 1. As is clear from Figure 1,
An absorption peak is seen around 9.5 GHz, and its value is
It was -37 dB.
【００３９】〔実施例２〕エチレン―プロピレン―ター
ポリマーゴム１００重量部に対して、平均径１．５ｎ
ｍ、平均長５００ｎｍの単層カーボンナノチューブ６重
量部とを配合し、２本ロールミールを用いて混練して、
電磁波吸収材料を調製した。次に、この電磁波吸収材料
をプレスして、厚さ０．６ｍｍ、１５０ｍｍ角のシート
状に成形し、電磁波吸収材を作成した。次いで、得られ
た電磁波吸収材をアルミ箔と接合したものに、周波数
１．０ＧＨｚ〜２０．０ＧＨｚの電波を入射し、その反
射減衰量を測定した。結果を図２に示す。図２より明ら
かなように、約３．８ＧＨｚ付近に吸収ピークが見ら
れ、その値は、―２７ｄＢであった。Example 2 With respect to 100 parts by weight of ethylene-propylene-terpolymer rubber, an average diameter of 1.5 n
m, 6 parts by weight of single-walled carbon nanotubes having an average length of 500 nm, and kneaded using a two-roll mill,
An electromagnetic wave absorbing material was prepared. Next, this electromagnetic wave absorbing material was pressed into a sheet having a thickness of 0.6 mm and a size of 150 mm square to prepare an electromagnetic wave absorbing material. Next, a radio wave having a frequency of 1.0 GHz to 20.0 GHz was incident on the obtained electromagnetic wave absorber joined to an aluminum foil, and the return loss was measured. The results are shown in Figure 2. As is clear from FIG. 2, an absorption peak was observed around 3.8 GHz, and the value was −27 dB.
【００４０】〔実施例３〕ポリエチレン１００重量部に
対して、フラーレン４重量部と、平均径１．５ｎｍ、平
均長５００ｎｍの単層カーボンナノチューブ４重量部と
を配合し、電磁波吸収材料をプレスして、厚さ０．８ｍ
ｍ、１５０ｍｍ角のシート状に成形し、電磁波吸収材を
作成した以外は、実施例１と同様の操作を行い、反射減
衰量を測定した。結果を図３に示す。図３より明らかな
ように、約２．７ＧＨｚ付近に吸収ピークが見られ、そ
の値は、―２７ｄＢであった。Example 3 4 parts by weight of fullerene and 4 parts by weight of single-walled carbon nanotubes having an average diameter of 1.5 nm and an average length of 500 nm were mixed with 100 parts by weight of polyethylene, and the electromagnetic wave absorbing material was pressed. Thickness 0.8m
The return loss was measured in the same manner as in Example 1, except that the electromagnetic wave absorber was formed into a sheet having a size of 150 m square and m. The results are shown in Fig. 3. As is clear from FIG. 3, an absorption peak was observed at around 2.7 GHz, and the value was -27 dB.
【００４１】〔実施例４〕ポリエチレン１００重量部に
対して、フラーレン８重量部を配合し、電磁波吸収材料
をプレスして、厚さ０．８ｍｍ、１５０ｍｍ角のシート
状に成形し、電磁波吸収材を作成した以外は、実施例１
と同様の操作を行い、反射減衰量を測定した。結果を図
４に示す。図４より明らかなように、約２．１ＧＨｚ付
近に吸収ピークが見られ、その値は、―３０ｄＢであっ
た。Example 4 8 parts by weight of fullerene was mixed with 100 parts by weight of polyethylene, and the electromagnetic wave absorbing material was pressed to form a sheet having a thickness of 0.8 mm and 150 mm square. Example 1 except that
The same operation was performed and the return loss was measured. The results are shown in Fig. 4. As is clear from FIG. 4, an absorption peak was observed around 2.1 GHz, and the value was −30 dB.
【００４２】[0042]
【発明の効果】請求項１に記載の電磁波吸収材料は、以
上のように、樹脂とナノサイズ炭素材料とを含む構成で
ある。As described above, the electromagnetic wave absorbing material according to the first aspect of the invention is configured to include the resin and the nano-sized carbon material.
【００４３】それゆえ、高周波帯域を含む１〜２０ＧＨ
ｚの広い範囲で優れた電磁波吸収能を有するナノサイズ
炭素材料を含むことで、少量のナノサイズ炭素材料で充
分な電磁波吸収能を有する電磁波吸収材料を得ることが
できる。このため、樹脂本来の特性を阻害することな
く、樹脂中に分散させることができる。また、特殊形状
を有するナノサイズ炭素材料を用いていることで、従来
の電磁波吸収材料のように、カーボンブラック等の別物
質を混合する必要がない。このため、ナノサイズ炭素材
料という1種類の物質のみ配合すればよいので、製造コ
ストを低減し製造工程を簡略化でき、柔軟性、加工性、
施工性に優れた電磁波吸収材料を得られるという効果を
奏する。Therefore, 1 to 20 GH including the high frequency band
By including the nano-sized carbon material having excellent electromagnetic wave absorbing ability in a wide range of z, an electromagnetic wave absorbing material having sufficient electromagnetic wave absorbing ability can be obtained with a small amount of nano-sized carbon material. Therefore, the resin can be dispersed in the resin without impairing the original characteristics of the resin. Further, since the nano-sized carbon material having the special shape is used, it is not necessary to mix another substance such as carbon black as in the conventional electromagnetic wave absorbing material. Therefore, only one type of substance, a nano-sized carbon material, needs to be blended, which reduces the manufacturing cost and simplifies the manufacturing process.
An effect that an electromagnetic wave absorbing material having excellent workability can be obtained.
【００４４】請求項２に記載の電磁波吸収材料は、以上
のように、樹脂100重量部に対して、ナノサイズ炭素材
料が１〜１０重量部の割合で配合されている構成であ
る。As described above, the electromagnetic wave absorbing material according to the second aspect of the present invention has a composition in which the nano-sized carbon material is mixed in a ratio of 1 to 10 parts by weight with respect to 100 parts by weight of the resin.
【００４５】それゆえ、ナノサイズ炭素材料が上記割合
で配合されていることで、電磁波吸収性を保持しつつ、
かつ、樹脂中での該炭素材料の分散性をも得ることがで
きるので、より優れた電磁波吸収能を発現し、かつ、柔
軟性、加工性、施工性にも優れた電磁波吸収材料を得ら
れるという効果を奏する。Therefore, by incorporating the nano-sized carbon material in the above proportion, while maintaining the electromagnetic wave absorption,
Moreover, since the dispersibility of the carbon material in the resin can also be obtained, it is possible to obtain an electromagnetic wave absorbing material exhibiting more excellent electromagnetic wave absorbing ability and having excellent flexibility, processability, and workability. Has the effect.
【００４６】請求項３に記載の電磁波吸収材料は、以上
のように、前記ナノサイズ炭素材料が、直径１〜１００
ｎｍ、長さ５０μｍ以下のカーボンナノチューブである
構成である。As described above, in the electromagnetic wave absorbing material according to claim 3, the nano-sized carbon material has a diameter of 1 to 100.
The carbon nanotubes have a size of nm and a length of 50 μm or less.
【００４７】請求項４に記載の電磁波吸収材料は、以上
のように、前記ナノサイズ炭素材料が、フラーレン及び
カーボンナノチューブの少なくともいずれかを含む構成
である。As described above, the electromagnetic wave absorbing material according to a fourth aspect of the present invention is such that the nano-sized carbon material contains at least one of fullerene and carbon nanotube.
【００４８】それゆえ、ナノサイズ炭素材料が上記サイ
ズのカーボンナノチューブあるいはフラーレンであるこ
とで、微小でありながら優れた電磁波吸収性を発揮する
ことができるので、樹脂中での分散性もよく、柔軟性、
加工性、施工性により優れた電磁波吸収材料を得られる
という効果を奏する。Therefore, when the nano-sized carbon material is the carbon nanotube or fullerene having the above-mentioned size, it is possible to exhibit excellent electromagnetic wave absorbing property even though it is minute, so that it has good dispersibility in the resin and is flexible. sex,
It is possible to obtain an electromagnetic wave absorbing material having excellent workability and workability.
【００４９】請求項５に記載の電磁波吸収材は、以上の
ように、請求項１ないし４のいずれか1項に記載の電磁
波吸収材料を成形してなる構成である。The electromagnetic wave absorbing material described in claim 5 is formed by molding the electromagnetic wave absorbing material according to any one of claims 1 to 4 as described above.
【００５０】それゆえ、上記電磁波吸収材料を成形して
なることで、１〜２０ＧＨｚ範囲という広い周波数領域
において高電磁波吸収能を発現し、かつ、柔軟性、加工
性、施工性にも優れた電磁波吸収材を得られるという効
果を奏する。Therefore, by molding the above electromagnetic wave absorbing material, an electromagnetic wave exhibiting a high electromagnetic wave absorbing ability in a wide frequency range of 1 to 20 GHz and being excellent in flexibility, processability and workability. This has the effect of obtaining an absorbent material.
【図１】 本発明の一実施の形態に係る電磁波吸収材に
対し、周波数１．０ＧＨｚ〜２０．０ＧＨｚの電波を入
射し、その反射減衰量を測定した結果を示すグラフであ
る。FIG. 1 is a graph showing a result of measuring a return loss by injecting a radio wave having a frequency of 1.0 GHz to 20.0 GHz into an electromagnetic wave absorber according to an embodiment of the present invention.
【図２】 本発明の他の実施の形態に係る電磁波吸収材
に対し、周波数１．０ＧＨｚ〜２０．０ＧＨｚの電波を
入射し、その反射減衰量を測定した結果を示すグラフで
ある。FIG. 2 is a graph showing a result of measuring a return loss by injecting a radio wave having a frequency of 1.0 GHz to 20.0 GHz into an electromagnetic wave absorber according to another embodiment of the present invention.
【図３】 本発明の他の実施の形態に係る電磁波吸収材
に対し、周波数１．０ＧＨｚ〜２０．０ＧＨｚの電波を
入射し、その反射減衰量を測定した結果を示すグラフで
ある。FIG. 3 is a graph showing a result of measuring a return loss by injecting a radio wave having a frequency of 1.0 GHz to 20.0 GHz into an electromagnetic wave absorber according to another embodiment of the present invention.
【図４】 本発明の他の実施の形態に係る電磁波吸収材
に対し、周波数１．０ＧＨｚ〜２０．０ＧＨｚの電波を
入射し、その反射減衰量を測定した結果を示すグラフで
ある。FIG. 4 is a graph showing a result of measuring a return loss by injecting a radio wave having a frequency of 1.0 GHz to 20.0 GHz into an electromagnetic wave absorber according to another embodiment of the present invention.
Claims (5)
を特徴とする電磁波吸収材料。1. An electromagnetic wave absorbing material comprising a resin and a nano-sized carbon material.
素材料が1〜10重量部の割合で配合されていることを特
徴とする請求項１記載の電磁波吸収材料。2. The electromagnetic wave absorbing material according to claim 1, wherein the nano-sized carbon material is mixed in a ratio of 1 to 10 parts by weight with respect to 100 parts by weight of the resin.
ｎｍ、長さ50μｍ以下のカーボンナノチューブであるこ
とを特徴とする請求項1または２記載の電磁波吸収材
料。3. The nano-sized carbon material has a diameter of 1 to 100.
3. The electromagnetic wave absorbing material according to claim 1, which is a carbon nanotube having a length of nm and a length of 50 μm or less.
及びカーボンナノチューブの少なくともいずれかを含む
ことを特徴とする請求項１ないし３のいずれか1項に記
載の電磁波吸収材料。4. The electromagnetic wave absorbing material according to any one of claims 1 to 3, wherein the nano-sized carbon material contains at least one of fullerene and carbon nanotube.
の電磁波吸収材料を成形してなることを特徴とする電磁
波吸収材。5. An electromagnetic wave absorbing material obtained by molding the electromagnetic wave absorbing material according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001357673A JP2003158395A (en) | 2001-11-22 | 2001-11-22 | Electromagnetic wave absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001357673A JP2003158395A (en) | 2001-11-22 | 2001-11-22 | Electromagnetic wave absorbing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003158395A true JP2003158395A (en) | 2003-05-30 |
Family
ID=19168976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001357673A Pending JP2003158395A (en) | 2001-11-22 | 2001-11-22 | Electromagnetic wave absorbing material |
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| WO2005075571A1 (en) * | 2004-02-04 | 2005-08-18 | Osaka Gas Co., Ltd. | RESIN COMPOSITION FOR GHz-BAND ELECTRONIC COMPONENT AND GHz-BAND ELECTRONIC COMPONENT |
| JP2005252080A (en) * | 2004-03-05 | 2005-09-15 | Fuji Xerox Co Ltd | Wave absorber and its manufacturing method |
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