JP3520470B2 - Radio wave absorber - Google Patents
Radio wave absorberInfo
- Publication number
- JP3520470B2 JP3520470B2 JP2000339539A JP2000339539A JP3520470B2 JP 3520470 B2 JP3520470 B2 JP 3520470B2 JP 2000339539 A JP2000339539 A JP 2000339539A JP 2000339539 A JP2000339539 A JP 2000339539A JP 3520470 B2 JP3520470 B2 JP 3520470B2
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- wave absorber
- resin
- ilmenite
- magnetic
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁性材料により構
成される電波吸収体に関する。TECHNICAL FIELD The present invention relates to a radio wave absorber made of a magnetic material.
【０００２】[0002]
【従来の技術】現在電波吸収体に使われる磁性材料とし
ては、ソフトフェライトの使用が主流であり、必要に応
じて軟磁性金属が使用されている。また、一部用途には
電波吸収材料として特殊なカーボンが使用されている。
金属フェライトは、重量が重く、高価で、加工性にも問
題がある。例えば電波吸収体に使われるソフトフェライ
トの製造は、酸化鉄、酸化亜鉛及び酸化マンガン等の混
合→仮焼→粉砕→顆粒→成形→燒結→研磨或いは粉砕の
順で行われ、板状に成形燒結したものはフェライトタイ
ルに、燒結後粉砕したものは、ゴムや樹脂に練り混ぜ、
板状にして、夫々電波吸収体として利用されている。し
かし乍ら、このようなソフトフェライトの製造は、製造
工程が複雑である上、仮焼、燒結を８００℃〜１４００
℃の高温で行うためエネルギー消費が大きい。また、上
記ソフトフェライトを粉砕してゴムや樹脂に練り混ぜて
電波吸収体とするものは、粉砕効率の面でも問題を抱え
ていた。一方、特殊カーボンは高価で、性能に比較して
コストが高く、広く一般に使用される段階には至ってい
ない。2. Description of the Related Art Currently, soft ferrite is mainly used as a magnetic material used in a radio wave absorber, and a soft magnetic metal is used as necessary. In addition, special carbon is used as a radio wave absorbing material for some applications.
Metal ferrite is heavy, expensive, and has a problem in workability. For example, the production of soft ferrite used for radio wave absorbers is carried out in the order of mixing iron oxide, zinc oxide, manganese oxide, etc. → calcination → crushing → granules → molding → sintering → polishing or crushing, and forming and sintering into a plate shape. What was done was ferrite tile, what was crushed after sintering was kneaded with rubber or resin,
Each plate is used as a radio wave absorber. However, in manufacturing such soft ferrite, the manufacturing process is complicated and calcination and sintering are performed at 800 ° C to 1400.
Energy consumption is high because it is performed at a high temperature of ℃. In addition, the above-mentioned soft ferrite that is crushed and kneaded with rubber or resin to form a radio wave absorber has a problem in terms of crushing efficiency. On the other hand, special carbon is expensive, and its cost is higher than its performance, and it has not reached the stage of being widely and generally used.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上述したよう
な従来事情に鑑みてなされたもので、その目的とする処
は、工業的に容易且つ安価に入手できる材料を使い、し
かもソフトフェライトが抱える焼成、粉砕などに伴う前
記問題点を克服し、簡単に製造できてその製造のための
エネルギー消費も少ない電波吸収体を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances. The object of the present invention is to use a material that is industrially easily and inexpensively available, An object of the present invention is to provide a radio wave absorber that overcomes the above problems associated with firing and crushing, and that can be easily manufactured and consumes less energy for manufacturing.
【０００４】[0004]
【課題を解決するための手段】本発明の発明者等は、耐
火粘土及びガラス用ケイ砂の原料に含まれ、産業廃棄物
として埋め立て廃棄されているイルメナイトが磁性を有
していることに着目し、電波吸収体としての諸物性を調
査した結果、火成岩等の造岩鉱物の磁性を有するイルメ
ナイト（以下磁性イルメナイトという）が電波吸収材料
としての基本的な要求特性を満たす物性を備えているこ
とを見出し、本発明に到達した。DISCLOSURE OF THE INVENTION The inventors of the present invention have noticed that ilmenite, which is contained in the raw materials of refractory clay and silica sand for glass and is landfilled as industrial waste, has magnetism. However, as a result of investigating various physical properties as an electromagnetic wave absorber, it is confirmed that the ilmenite having magnetism of rock forming minerals such as igneous rock (hereinafter referred to as magnetic ilmenite) has physical properties satisfying basic required properties as an electromagnetic wave absorbing material. And has reached the present invention.
【０００５】岩石等が風化作用を受けて物理的粉砕や化
学的変質をする過程において副造岩鉱物が残存する。通
常ガラス用ケイ砂、陶磁器用粘土を得るために風化花崗
岩及びその変質体から石英、風化長石及びカオリナイト
等を回収する場合、テーブル選鉱（重力分離法）、磁選
工程にて副造岩鉱物の磁性イルメナイト、マグネタイ
ト、磁硫鉄鉱、黄鉄鉱、黒雲母及び含鉄酸化チタンの他
にジルコン、ゼノタイム等が捕集され産業廃棄物として
埋め立てられており、イルメナイトはきわめて安価且つ
容易に入手可能である。By-product minerals remain in the process of physical crushing and chemical alteration of rocks and the like by weathering. When recovering quartz, weathered feldspar, kaolinite, etc. from weathered granite and its altered materials to obtain silica sand for glass and clay for ceramics, table mineral processing (gravity separation method) Magnetic ilmenite, magnetite, pyrrhotite, pyrite, biotite, iron oxide-containing titanium oxide, zircon, xenotime, etc. are collected and landfilled as industrial waste, and ilmenite is very inexpensive and easily available.
【０００６】発明者等は、耐火粘土及びガラス用ケイ砂
の原料に含まれ、従来は産業廃棄物として埋め立て廃棄
されていた上記天然の磁性イルメナイトを磁石で捕集
し、バインダーとして少量の樹脂を使用して硬化させれ
ば、大きな電波吸収効果を発揮し、樹脂量８wt%添加
で、厚さ９ｍｍの硬化体の場合、周波数１．６５ＧＨｚ
〜１．８５ＧＨｚの帯域において電波吸収率が９７％以
上に達することを各種試験により確認した。The inventors of the present invention collect the above-mentioned natural magnetic ilmenite, which is contained in the raw materials of refractory clay and silica sand for glass, and was conventionally landfilled as industrial waste, with a magnet, and a small amount of resin is used as a binder. When used and cured, it exerts a large electromagnetic wave absorption effect, and with a resin amount of 8 wt% added, a cured product with a thickness of 9 mm has a frequency of 1.65 GHz.
It was confirmed by various tests that the radio wave absorption rate reaches 97% or more in the band of up to 1.85 GHz.
【０００７】即ち、本発明の電波吸収体では、前記目的
を達成するために、火成岩等の造岩鉱物の磁性を有する
イルメナイト（磁性イルメナイト）を電波吸収材料とし
て用いることを特徴とし、また、このイルメナイトに樹
脂を添加して練り混ぜ硬化体とすることを特徴とする。That is, in the radio wave absorber of the present invention, in order to achieve the above object, ilmenite (magnetic ilmenite) having magnetism of a rock-forming mineral such as igneous rock is used as a radio wave absorbing material. It is characterized in that a resin is added to ilmenite and the mixture is kneaded to obtain a cured product.
【０００８】上記磁性イルメナイトは、前述のようにガ
ラス用ケイ砂、陶磁器用粘土を得るために風化花崗岩及
びその変質体から石英、風化長石及びカオリナイト等を
回収する際の磁選工程において、磁石で捕集する。磁石
での捕集は、室温（２０℃）で行うことも勿論可能であ
るが、液体窒素（７７．４Ｋ）中に投入し、充分冷却し
た後、磁石により捕集するようにすれば、より効率的に
捕集することが出きる。この捕集した天然の磁性イルメ
ナイトに、バインダーとして熱硬化性樹脂を添加し、常
温又は加熱下で加圧成形し硬化体とし、定型の電波吸収
体を製造することが出きる。磁性イルメナイトの粒子径
は、特に制限されるものではないが、１０μｍ〜５００
μｍ程度のものが好ましい。The above-mentioned magnetic ilmenite is used as a magnet in a magnetic separation step in recovering quartz, weathered feldspar, kaolinite, etc. from weathered granite and its altered materials in order to obtain silica sand for glass and clay for ceramics as described above. To collect. It is of course possible to collect with a magnet at room temperature (20 ° C.), but if it is put into liquid nitrogen (77.4K) and sufficiently cooled, it is possible to collect with a magnet. It can be efficiently collected. A thermosetting resin as a binder may be added to the collected natural magnetic ilmenite and pressure-molded at room temperature or under heating to obtain a cured product, thereby producing a standard electromagnetic wave absorber. The particle size of the magnetic ilmenite is not particularly limited, but is 10 μm to 500 μm.
It is preferably about μm.
【０００９】上記樹脂には、例えばエポキシ樹脂、フェ
ノール樹脂を用いることが望ましいが、熱硬化性樹脂で
あれば上記樹脂以外の樹脂を使用することも可能であ
る。樹脂の添加量は５wt%〜１５wt%が好適であるが、８
％添加が最適である。また、硬化体の厚さは９ｍｍが最
適であるが、電波吸収体の用途に応じて厚さを増減する
ことは任意である。It is desirable to use, for example, an epoxy resin or a phenol resin as the above resin, but it is also possible to use a resin other than the above resins as long as it is a thermosetting resin. The amount of resin added is preferably 5 wt% to 15 wt%, but 8
% Addition is optimal. The optimum thickness of the cured product is 9 mm, but it is optional to increase or decrease the thickness depending on the application of the radio wave absorber.
【００１０】尚、磁性イルメナイトを上記のように樹脂
で固めた硬化体とせず、燒結体とした場合には、樹脂で
固めたものに比較してその電波吸収能は大幅に低下する
ことを確認した。It has been confirmed that when the magnetic ilmenite is not hardened with resin as described above and is made into a sintered body, its radio wave absorbing ability is significantly reduced as compared with that hardened with resin. did.
【００１１】以上説明した本発明の電波吸収体は、上記
磁性イルメナイトが充分な耐候性を備えていることか
ら、土木・建築分野の二次製品として、電波環境保全の
ための、壁材、天井材、床材、外壁材等に広く利用でき
る。Since the magnetic ilmenite of the present invention described above has sufficient weather resistance, the above-mentioned magnetic ilmenite is used as a secondary product in the field of civil engineering / construction for protection of radio wave environment, such as wall material and ceiling. It can be widely used for wood, flooring, exterior wall materials, etc.
【００１２】[0012]
【実施例】以下本発明を実施例により更に詳細に説明す
る。尚、以下の実施例は、本発明を具体化した一例であ
って、本発明はその要旨を変えない限り変更可能であ
り、この実施例に限定されるものではない。EXAMPLES The present invention will now be described in more detail with reference to examples. The following embodiments are examples embodying the present invention, and the present invention can be modified without changing the gist thereof, and is not limited to these embodiments.
【００１３】ガラス用ケイ砂、陶磁器用粘土を得るため
に風化花崗岩及びその変質体から石英、風化長石及びカ
オリナイト等を回収する際の磁選工程において、磁石で
捕集した粒径１０μｍ〜５００μｍの磁性イルメナイト
９０wt%と、エポキシ樹脂、フェノール樹脂等の熱硬化
性樹脂８wt%、硬化剤２wt%を練り混ぜ、これを圧力１０
０kgf／ｃｍ2以上で加圧成形し、厚さ９ｍｍで常温或い
は１５０℃で硬化させ、電波吸収体の測定サンプルを製
造した。上記サンプルの電波吸収性能を３９Ｄ同軸管法
で測定した。測定結果は図１に示すとおりであった。In the magnetic separation step in recovering quartz, weathered feldspar, kaolinite, etc. from weathered granite and its altered materials in order to obtain silica sand for glass and clay for ceramics, a particle size of 10 μm to 500 μm collected by a magnet is used. 90 wt% of magnetic ilmenite, 8 wt% of thermosetting resin such as epoxy resin and phenol resin, and 2 wt% of curing agent are kneaded and mixed at a pressure of 10
It was pressure-molded at 0 kgf / cm 2 or more and cured at room temperature or 150 ° C. with a thickness of 9 mm to manufacture a measurement sample of a radio wave absorber. The electromagnetic wave absorption performance of the above sample was measured by the 39D coaxial tube method. The measurement result was as shown in FIG.
【００１４】図１から分かるように、この実施例の電波
吸収体は、周波数１．６５ＧＨｚ〜１．８５ＧＨｚの帯
域において電波吸収率９７％以上、特に周波数１．７１
ＧＨｚ〜１．８２ＧＨｚの帯域においては９９％以上の
電波吸収率を有することが判明した。As can be seen from FIG. 1, the radio wave absorber of this embodiment has a radio wave absorption rate of 97% or more, particularly a frequency of 1.71 in the frequency band of 1.65 GHz to 1.85 GHz.
It was found that it has a radio wave absorption rate of 99% or more in the band of GHz to 1.82 GHz.
【００１５】[0015]
【発明の効果】本発明は、上記のような構成であるの
で、以下の優れた効果を奏する。
（ａ）ガラス用ケイ砂、陶磁器用粘土を得るために風化
花崗岩及びその変質体から石英、風化長石及びカオリナ
イト等を回収する際に、磁石で捕集され産業廃棄物とし
て処理される天然の磁性イルメナイトを電波吸収材料と
して用いるので、電波吸収材料の入手が工業的に安価且
つ容易に可能であるばかりでなく、ソフトフェライトの
ような製造工程の複雑さもなく、大きなエネルギー消費
も必要としない。従って、電波吸収体をローコストで提
供することができる上、産業廃棄物の低減にも寄与し得
る。
（ｂ）天然の磁性イルメナイトを樹脂で固めるだけで得
ることができるので、上記したように電波吸収材料の製
造に特別手間を必要としないばかりでなく、電波吸収体
の製造についても製造が簡単で、電波吸収材料の混合、
焼成、研磨等の工程を必要としない。
（ｃ）樹脂の添加量を５wt%〜１５wt%とすることによ
り、大きな電波吸収能を有し、特に添加量を８wt%とす
れば周波数１．７１ＧＨｚ〜１．８２ＧＨｚの帯域にお
いては９９％以上の電波吸収率を有しする。そして、イ
ルメナイトは、耐候性に優れるため土木・建築分野にお
ける電波環境保全のための二次製品として、広く利用可
能である。EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, it has the following excellent effects. (A) When recovering quartz, weathered feldspar, kaolinite, etc. from weathered granite and its alterations to obtain silica sand for glass, clay for ceramics, natural materials that are collected by a magnet and treated as industrial waste. Since magnetic ilmenite is used as a radio wave absorbing material, not only is the radio wave absorbing material available industrially cheaply and easily, but also the manufacturing process such as soft ferrite is not complicated and large energy consumption is not required. Therefore, the radio wave absorber can be provided at low cost, and it can also contribute to the reduction of industrial waste. (B) Since natural magnetic ilmenite can be obtained simply by hardening it with a resin, not only the special labor is not required for manufacturing the electromagnetic wave absorbing material as described above, but also the manufacturing of the electromagnetic wave absorber is easy. , Mixing of electromagnetic wave absorbing material,
No steps such as firing and polishing are required. (C) By adding 5 wt% to 15 wt% of the resin, it has a large radio wave absorption ability. Especially, if the adding amount is 8 wt%, it is 99% or more in the frequency band of 1.71 GHz to 1.82 GHz. It has a radio wave absorption rate of. Since ilmenite has excellent weather resistance, it can be widely used as a secondary product for radio wave environment protection in the fields of civil engineering and construction.
【図１】本発明電波吸収体の一実施例における電波吸収
特性を示すグラフ。FIG. 1 is a graph showing the electromagnetic wave absorption characteristics of an example of the electromagnetic wave absorber of the present invention.
───────────────────────────────────────────────────── フロントページの続き (73)特許権者 503388430 阿久根 昭成 千葉県柏市東中新宿４−６−33 (74)上記１名の代理人 100109955 弁理士 細井 貞行 （外３名） (73)特許権者 597019584 芝崎 靖雄 名古屋市熱田区大宝二丁目４番 白鳥パ ークハイツ大宝団地 第９棟第601号 (74)上記１名の代理人 100109955 弁理士 細井 貞行 （外２名） (72)発明者 芝崎 靖雄 愛知県名古屋市熱田区大宝２丁目４番 白鳥パークハイツ大宝団地９棟601号 (72)発明者 水島 清 石川県松任市倉光西２丁目12番１号 (72)発明者 東 宏文 埼玉県行田市持田４丁目７番14号 (72)発明者 西田 斉 埼玉県熊谷市上之2033番地 Ｂ−307 (72)発明者 小栗 賢太 石川県松任市相木町383番地 ニッコー 株式会社男子寮 (72)発明者 阿久根 昭成 千葉県柏市東中新宿４−６−33 (56)参考文献 特開 昭63−202999（ＪＰ，Ａ) 特開 平４−357000（ＪＰ，Ａ) 特開 平11−289188（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H05K 9/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (73) Patent holder 503388430 Akune Akune 4-6-33 Higashi-Nakashinjuku, Kashiwa-shi, Chiba (74) One of the above agents 100109955 Patent Attorney Sadayuki Hosoi (3 others) (73) Patent Right holder 597019584 Yasuo Shibasaki Shirotori Park Heights Daiho Danchi, 4-4 Daiho, Atsuta-ku, Nagoya-shi No. 601 (74) One agent of the above 100109955 Attorney Sadayuki Hosoi (2 outside) (72) Inventor Shibasaki Yasushio 2-chome, Shirota Park Heights, 2-4 Takara Park, Atsuta-ku, Nagoya, Aichi Prefecture, No. 601 (72), Inventor Kiyoshi Mizushima 2-12-1, Kuraminishi, Matsuto City, Ishikawa Prefecture Inventor Hirofumi Higashi, Gyoda, Saitama Prefecture 4-7-14, Mochida, Ichi (72) Hitoshi Nishida, 2033 Kamino, Kumagaya, Saitama Prefecture B-307 (72) Kenta Oguri, 383, Aikimachi, Matsuto, Ishikawa Prefecture Nikko Stock Company boy dormitory (72) Inventor Akune Akune 4-6-33 (56) Higashi-Nakashinjuku, Kashiwa-shi, Chiba (56) Reference JP-A-63-202999 (JP, A) JP-A-4-357000 (JP, A) JP Flat 11-289188 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H05K 9/00
Claims (3)
めに風化花崗岩及びその変質体から石英、風化長石及び
カオリナイト等を回収する際に、磁石で捕集される粒径
１０μｍ〜５００μｍの天然の磁性イルメナイトを電波
吸収材料とし、焼結することなく樹脂で固めた硬化体と
した電波吸収体。1. A silica sand for glass and a clay for ceramics are obtained.
From weathered granite and its alterations to quartz, weathered feldspar and
Particle size collected by the magnet when collecting kaolinite, etc.
A hardened body made of natural magnetic ilmenite of 10 μm to 500 μm used as a radio wave absorbing material and hardened with resin without sintering
Wave absorber was.
ルメナイトに樹脂を添加し、練り混ぜて硬化体としたこ
とを特徴とする電波吸収体。2. The radio wave absorber according to claim 1, wherein a resin is added to ilmenite and the mixture is kneaded to obtain a cured body.
脂の添加量を５wt％〜１５wt％としたことを特徴とする
電波吸収体。3. The radio wave absorber according to claim 2, wherein the amount of resin added is 5 wt% to 15 wt%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000339539A JP3520470B2 (en) | 2000-11-07 | 2000-11-07 | Radio wave absorber |
| PCT/JP2001/009674 WO2002039800A1 (en) | 2000-11-07 | 2001-11-06 | Electric wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000339539A JP3520470B2 (en) | 2000-11-07 | 2000-11-07 | Radio wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002151880A JP2002151880A (en) | 2002-05-24 |
| JP3520470B2 true JP3520470B2 (en) | 2004-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000339539A Expired - Lifetime JP3520470B2 (en) | 2000-11-07 | 2000-11-07 | Radio wave absorber |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3520470B2 (en) |
| WO (1) | WO2002039800A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004128432A (en) * | 2002-10-06 | 2004-04-22 | Hiroki Kozuka | Radio wave absorption shield and method of constituting same |
| JP4752934B2 (en) * | 2009-03-05 | 2011-08-17 | Ｔｄｋ株式会社 | Radio wave absorber and manufacturing method thereof |
| CN105236787B (en) * | 2015-08-25 | 2017-10-24 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of electromagnetic wave Geophysical Experiment model |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07101786B2 (en) * | 1987-02-18 | 1995-11-01 | テイカ株式会社 | Electromagnetic wave absorbing material |
| JP3796680B2 (en) * | 1998-04-01 | 2006-07-12 | テイカ株式会社 | Electromagnetic wave absorbing material |
-
2000
- 2000-11-07 JP JP2000339539A patent/JP3520470B2/en not_active Expired - Lifetime
-
2001
- 2001-11-06 WO PCT/JP2001/009674 patent/WO2002039800A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002039800A1 (en) | 2002-05-16 |
| JP2002151880A (en) | 2002-05-24 |
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