JPH0346399A - Manufacture of material provided with sound absorbing and wave absorbing properties - Google Patents
Manufacture of material provided with sound absorbing and wave absorbing propertiesInfo
- Publication number
- JPH0346399A JPH0346399A JP18192389A JP18192389A JPH0346399A JP H0346399 A JPH0346399 A JP H0346399A JP 18192389 A JP18192389 A JP 18192389A JP 18192389 A JP18192389 A JP 18192389A JP H0346399 A JPH0346399 A JP H0346399A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- ferrite particles
- resin
- particles
- radio wave
- 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
- 239000000463 material Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000002245 particle Substances 0.000 claims abstract description 57
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 52
- 239000011347 resin Substances 0.000 claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 3
- 239000011342 resin composition Substances 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000007790 scraping Methods 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 28
- 238000000034 method Methods 0.000 description 13
- 239000011148 porous material Substances 0.000 description 7
- 239000011358 absorbing material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000005011 phenolic resin Substances 0.000 description 5
- 239000011449 brick Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 229920003986 novolac Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229930185605 Bisphenol Natural products 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010011878 Deafness Diseases 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- -1 sheets Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Building Environments (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は吸音性ならびに電波吸収性を具えた材料の製造
法に係り、詳しくは、電波吸収性と音波吸収性の両者が
要求される建築用素材として用いられる多孔質で吸音性
ならびに電波吸収性を具えた材料の製造法に係る。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for producing a material having sound absorbing properties and radio wave absorbing properties, and specifically relates to a construction material that requires both radio wave absorbing properties and sound wave absorbing properties. This invention relates to a method for manufacturing porous materials with sound-absorbing and radio wave-absorbing properties that are used as
従 来 の 技 術
従来から、電波吸収材は電波暗室、テレビ電波障害とし
てのゴースト対策、また、橋梁におけるレーダ偽像対策
として、フェライト系のレンガ、シート、カーボン系素
材等が多用されてきた。一方、吸音材としては多孔質材
が用いられ、セラミックス、金属、樹脂等がその材料と
して使用されてきた。この両者は建築用素材としては兼
ね備えていることが望ましいのであるが、両特性を示す
素材は現在まで殆んど知られておらず、両特性の必要な
場合には両者の特性をそれぞれ含有する素材を使用して
いた。その例として実開昭６３−１２８７９５号公報で
は金ａｉと発泡プラスチックを使用する方法が示されて
いるにすぎない。Conventional technology Traditionally, ferrite-based bricks, sheets, carbon-based materials, etc. have been widely used as radio wave absorbing materials in anechoic chambers, as countermeasures against ghosts that interfere with TV radio waves, and as countermeasures against radar false images on bridges. On the other hand, porous materials have been used as sound absorbing materials, and ceramics, metals, resins, etc. have been used as the materials. It is desirable for a building material to have both of these properties, but until now there are almost no known materials that exhibit both properties, and when both properties are required, it is necessary to have both properties material was used. As an example, Japanese Utility Model Application Publication No. 63-128795 merely discloses a method using gold AI and foamed plastic.
発明が解決しようとする課題
本発明は上記問題の解決を目的とし、具体的には、電波
吸収に関してはテレビ等のゴースト対策として建物での
電波吸収を５〜５０ｄＢ、音波の吸収に関しては５００
〜１５００口２の周波数帯で０．７以上の吸音率を達成
することができる多孔質吸音性と電波吸収性と両特性を
同時に兼ね備えた多孔質吸音、電波吸収材の製造法を提
案することを目的とする。Problems to be Solved by the Invention The present invention aims to solve the above-mentioned problems.Specifically, in terms of radio wave absorption, the radio wave absorption in buildings is 5 to 50 dB as a countermeasure against ghosts such as TVs, and in the case of sound wave absorption, it is 500 dB.
To propose a manufacturing method for a porous sound absorbing and radio wave absorbing material that can achieve a sound absorption coefficient of 0.7 or more in the frequency band of ~1500 mouths2 and has both porous sound absorbing properties and radio wave absorbing properties at the same time. With the goal.
課題を解決するための
手段ならびにその作用
すなわち、本発明は粒子径２０〜５００μｍのフェライ
ト粒子の表面に、このフェライト粒子に対し１〜１０重
量％の熱硬化性樹脂未硬化物と、この未硬化物の硬化に
必要な最の硬化剤等の混合物を被覆し、フェライト粒子
が粘着しない状態とした後、金型内で加熱硬化させるこ
とを特徴とする。Means for Solving the Problems and Their Effects Namely, the present invention provides an uncured thermosetting resin on the surface of ferrite particles having a particle size of 20 to 500 μm, and an uncured thermosetting resin of 1 to 10% by weight based on the ferrite particles. The method is characterized in that the ferrite particles are coated with a mixture of hardening agents and the like necessary for hardening the product to make the ferrite particles non-adhesive, and then heated and hardened in a mold.
以下、更に本発明の手段たる構成ならびにその作用につ
いて説明すると、次の通りである。Hereinafter, the configuration of the means of the present invention and its operation will be further explained as follows.
本発明は７Ｉライト（Ｍ］ＩＯ，Ｆｅ２ｏ３、でＭｌは
Ｍｎ、Ｆｅ、Ｃｏ、Ｎｉ、ＣＵ％Ｚｎ。The present invention is 7I light (M]IO, Fe2o3, and Ml is Mn, Fe, Co, Ni, CU%Zn.
Ｍｏ、ｃｄ％ｅｔｃ、）粒子を用いて多孔質材を作り、
フェライト粒子の持っている特性である強磁性体による
電波吸収特性にフェライトを多孔質化することにより、
音波吸収作用を兼ね備えさせようとするものである。フ
ェライトは通常電波吸収材としてテレビのゴースト対策
、Ｎ波障害、レーダ偽像防止対策として一般的に実用化
されているものであるが、このフェライトは電波吸収材
として用いる場合、通常１０ａ前後の板状のフェライト
レンガがテレビ等の電波ゴースト対策として建物の外壁
に貼付されている。しかし、近年騒音に対する厳しい要
求が出てきており、このフェライトレンガのみでは音波
を反射するために対応できなくなってきている。また、
フェライトレンガ自身は電波吸収材として使用されるに
あたって、自由空間からフェライトに入る境界面での特
殊な臨界結合を持たせるような設計法をとらないと、例
えば、フェライトの後面に金属板を貼付させる等、電波
吸収効果を上げる対策が必要である。Make a porous material using Mo, cd% etc.) particles,
By making ferrite porous, the radio wave absorption properties of ferrite particles due to ferromagnetic material are achieved.
This is intended to combine the effect of absorbing sound waves. Ferrite is generally put into practical use as a radio wave absorbing material to prevent TV ghosts, N wave interference, and radar false images. ferrite bricks are pasted on the exterior walls of buildings as a countermeasure against radio wave ghosts from televisions and other devices. However, in recent years there have been stricter requirements regarding noise, and ferrite bricks alone cannot meet these demands because they reflect sound waves. Also,
When ferrite brick itself is used as a radio wave absorbing material, it is necessary to take a design method that creates a special critical bond at the interface where the ferrite enters from free space. Measures to increase the radio wave absorption effect are necessary.
このような問題点を改善し、吸音作用を有し更に効果的
な電波吸収能力を兼ね備えた素材を開発したものが本発
明である。The present invention improves these problems and develops a material that has a sound absorbing effect and also has an effective radio wave absorbing ability.
本発明は通常の方法でフェライト粒子を製造し、その粒
子径が２０〜５００μｍのものを原料として、そのフェ
ライト粒子の表面を対粒子１〜１０重徴％の常温固体の
熱硬化性樹脂未硬化物に硬化剤等を配合してなる樹脂組
成物で均一に被覆処理したＭＡ脂脂環覆物その樹脂の硬
化温度以上に加熱することによって多孔質フェラ・イト
を形成する方法である。ここで使用される常温で固体の
熱硬化性樹脂としては（１）フェノール樹脂、（２）ジ
アリルフタレート樹脂、（３）エポキシ樹脂、（４）不
飽和ポリエステル樹脂等があげられ、これらのいずれの
樹脂を使用しても良い。In the present invention, ferrite particles are produced by a conventional method, and the particles having a particle size of 20 to 500 μm are used as a raw material. In this method, porous ferrite is formed by heating an MA alicyclic coating uniformly coated with a resin composition containing a curing agent and the like to a temperature higher than the curing temperature of the resin. Thermosetting resins that are solid at room temperature used here include (1) phenol resins, (2) diallyl phthalate resins, (3) epoxy resins, and (4) unsaturated polyester resins. Resin may also be used.
フェライト多孔質材の特性としては耐熱性を要求される
ような場合にはフェノール樹脂を用いればよい。その目
的に応じた樹脂を選択する事によって出来上がった製品
の特性、特に、強度、耐食性、耐熱性等が確保できる。When heat resistance is required as a characteristic of the ferrite porous material, a phenol resin may be used. By selecting a resin appropriate for the purpose, the properties of the finished product, especially strength, corrosion resistance, heat resistance, etc., can be ensured.
樹脂選択にあたって重要な点は常温で固体であり、その
融点が６０〜１２０℃のもので、更に融点以上で急激に
粘性が低下して、フェライト粒子表面に均一に？ｇ！、
覆され易いものを選択する必要がある。このような樹脂
としては、ノボラック型フェノール樹脂、また、エポキ
シ樹脂としてはビスフェノールへ型エポキシ樹脂、脂環
式エポキシ樹脂が適当である。The important point when selecting a resin is that it is solid at room temperature and has a melting point of 60 to 120°C, and that the viscosity decreases rapidly above the melting point so that it is uniformly spread over the surface of the ferrite particles. g! ,
You need to choose something that is easy to overturn. As such a resin, a novolac type phenol resin is suitable, and as an epoxy resin, a bisphenol type epoxy resin or an alicyclic epoxy resin is suitable.
次に、本発明に用いられるフェライト粒子の樹脂被覆物
の製造法について説明する。Next, a method for manufacturing the resin coating of ferrite particles used in the present invention will be explained.
まず、フェライト粒子を予め使用する熱硬化性樹脂硬化
物の融点より２０〜２００ ’Ｃ高い温度に予熱し、次
に、このフェライト粒子を回転ミキサー中に投入する。First, ferrite particles are preheated to a temperature 20 to 200'C higher than the melting point of the cured thermosetting resin to be used, and then the ferrite particles are placed in a rotating mixer.
このミキサーは、スクリュータイプ、羽タイプ何れでも
使用可能である。次に、固体の熱硬化性樹脂未硬化物を
ｉ拌中のミキサーに投入し、予熱されたフェライト粒子
の熱によって熔融させる。これら粒子を冷却する前に通
常使用されている硬化剤、触媒及びシランカップリング
剤を必要に応じて添加することができるが、このシラン
カップリング剤はフェライトと樹脂の結合力を高めるた
めのものである。This mixer can be of either a screw type or a blade type. Next, the uncured solid thermosetting resin is put into a mixing mixer and melted by the heat of the preheated ferrite particles. Before cooling these particles, commonly used curing agents, catalysts, and silane coupling agents can be added as necessary, but this silane coupling agent is used to increase the bonding strength between ferrite and resin. It is.
次に、冷却するが必要に応じて冷却のために水を添加し
てもよい。ミキサーの攪拌はフェライトの粒子がサラサ
ラになるまで続行することが必要である。この場合、滑
剤を添加してもよい。冷却後粒子を取り出すと、この粒
子表面には未硬化樹脂組成物が均一に被覆されている。Next, it is cooled, and water may be added for cooling if necessary. It is necessary to continue stirring with the mixer until the ferrite particles become smooth. In this case, a lubricant may be added. When the particles are taken out after cooling, the surfaces of the particles are uniformly coated with the uncured resin composition.
フェライト粒子に対する樹脂の量は１〜１０重量％、更
に好ましくは２〜５重量％である。この理由は１重量％
未満では焼成加熱後、多孔質板となった時点での強度不
足となるため好ましくなく、また、１０重量％超では強
度向上がこれ以上期待できないがらである。The amount of resin relative to the ferrite particles is 1 to 10% by weight, more preferably 2 to 5% by weight. The reason for this is 1% by weight
If it is less than 10% by weight, it is not preferable because the porous plate will have insufficient strength after firing and heating, and if it exceeds 10% by weight, no further improvement in strength can be expected.
次に、多孔質吸音、電波吸収材の製造法について図面に
より詳しく説明する。Next, a method for manufacturing the porous sound absorbing and radio wave absorbing material will be explained in detail with reference to the drawings.
第１図は本発明を実施する際に用いられる金型の斜視図
であり、第２図は第１図の側面図であり、第３図は本発
明の実施例の中心周波数と残響室法吸Ｍ率との関係を示
すグラフであり、第４図は電波吸収機器の電波吸収測定
用サンプルの配置図であり、第５図は電波吸収性特性の
測定方法のブロック図である。FIG. 1 is a perspective view of a mold used in carrying out the present invention, FIG. 2 is a side view of FIG. 1, and FIG. This is a graph showing the relationship with M absorption rate, FIG. 4 is a layout diagram of a sample for measuring radio wave absorption of a radio wave absorption device, and FIG. 5 is a block diagram of a method for measuring radio wave absorption characteristics.
符号１は金型、２はかき板、３はフェライト粒子を示す
。Reference numeral 1 indicates a mold, 2 indicates a scraper plate, and 3 indicates ferrite particles.
まず、第１図に示すように４角形状の金型１を用い、こ
の中へ前記のようにして未硬化樹脂組成物が均一に被覆
されたフェライト粒子３を流し込み充填する。次いで、
第２図に示すようにがき板２を用いて余分のフェライト
粒子３をかき落とす。これを金型に入れたまま炉に挿入
して２００〜３００℃で１〜３０分焼成硬化する。この
場合、型内に予め一定量の原料粒子を入れて、振動によ
り、粒子を動かして一定厚さとする方法を採用してもよ
い。First, as shown in FIG. 1, a rectangular mold 1 is used, into which the ferrite particles 3 uniformly coated with the uncured resin composition as described above are poured and filled. Then,
As shown in FIG. 2, excess ferrite particles 3 are scraped off using a scraping board 2. The mold is inserted into a furnace and fired and hardened at 200 to 300°C for 1 to 30 minutes. In this case, a method may be adopted in which a certain amount of raw material particles are placed in advance in a mold and the particles are moved by vibration to obtain a certain thickness.
また、多孔質材の空孔率を上げるためには前記の方法が
良いが、フェライトの粒子密度をあげるためには加圧に
よって粒子間の間隙を小さくする方法を取っても良い。Further, the above-mentioned method is good for increasing the porosity of the porous material, but in order to increase the particle density of ferrite, it is also possible to use a method of reducing the gaps between particles by applying pressure.
加圧力によって空孔率が下がり、吸音特性が低下するの
であまり加圧は好ましくない。It is not preferable to pressurize too much because the porosity decreases and the sound absorption properties deteriorate due to the pressurizing force.
このようにして作成した多孔質フェライト材の特性調査
を行なったところ、吸音特性は第３図に示すように良好
な吸音率を示した。吸音率の測定法は多孔質フェライト
ｉＱｍｍの板を用い、背面に空気層を背面壁面に対して
５０叩取って測定した。電波吸収については第４図に示
すように測定用サンプル４を測定系ユニットに取付け、
第５図に示すブロック図に従って測定を行なった。スイ
バ−から発信された電波が試料ホルダーに入って試料部
分に入射した時の反射係数を反射ユニット、周波数コン
パレータ、ネットワークアナライザー極座標表示器から
なるネットワークアナライザーシステムによって測定し
、Ｘ−Ｙレコーダーによって記録したのら、反射係数を
反射損失に換算して周波数に対応した反射損失のデータ
を測定する。このような方法で測定した１０Ｍと５ ｍ
ｍ厚みのフェライト多孔質材の電波吸収率を第１表に示
す。When the characteristics of the porous ferrite material thus prepared were investigated, it was found that the sound absorption property showed a good sound absorption coefficient as shown in FIG. The sound absorption coefficient was measured by using a porous ferrite iQmm plate and making an air layer on the back surface by knocking 50 times against the back wall surface. Regarding radio wave absorption, attach measurement sample 4 to the measurement system unit as shown in Figure 4.
Measurements were carried out according to the block diagram shown in FIG. When the radio waves emitted from the swirler entered the sample holder and entered the sample part, the reflection coefficient was measured by a network analyzer system consisting of a reflection unit, a frequency comparator, and a network analyzer polar coordinate display, and was recorded by an X-Y recorder. Then, the reflection coefficient is converted to return loss and the return loss data corresponding to the frequency is measured. 10M and 5m measured in this way
Table 1 shows the radio wave absorption rate of m-thick ferrite porous material.
なお、この際のＦ準は０．５ＩＩＩｌ１１の銅板の反射
率を１００％とした。In this case, the F standard was 0.5IIIl11, and the reflectance of the copper plate was 100%.
実施例 以下、実施例をあげてざらに説明する。Example Hereinafter, a rough explanation will be given by giving examples.
実施例１゜
平均粒径Ｑ、２ｍｍのＦｅ−Ｍｎ系フェライト粒子４ｋ
ｇを２３０ ”Ｃに予熱して回転しているミキサー中に
投入し、続いてタブレット状ノボラックタイプフェノー
ルレジン（群栄化学株式会社製、商品名ＰＳＭ２２４０
）２００Ｇをミキサー中に投入、樹脂が溶けて均一にフ
ェライト粒子に被覆された時点で硬化剤としてヘキサメ
チレンテトラミンの２０％水溶液を１５００Ｃ（対樹脂
１５重徴％）を添加し、樹脂組成物被覆粒子がブロッキ
ング〈熔融した樹脂が冷却して固体に変化するためＩｌ
ｌｌｌ中途中まる現象）を起こし始めた時点で粒子間の
滑剤として、ステアリン酸カルシウムを対樹脂で３重量
％添加し、粒子が完全に個々に分離した後、ミキサより
取り出した。Example 1゜Fe-Mn ferrite particles with an average particle size Q of 2 mm 4k
g was preheated to 230"C and put into a rotating mixer, and then a tablet of novolak type phenol resin (manufactured by Gunei Chemical Co., Ltd., trade name PSM2240) was added.
)200G was put into a mixer, and when the resin was melted and uniformly coated on the ferrite particles, 1500C of a 20% aqueous solution of hexamethylenetetramine was added as a hardening agent (15% based on the resin), and the resin composition was coated. Particles are blocking (because the molten resin cools and turns into a solid)
At the point when 3% by weight of calcium stearate based on the resin started to occur as a lubricant between the particles, the particles were completely separated into individual particles and then taken out from the mixer.
次に、この樹脂組成物被覆粒子を７０一イング式戒形機
に投入し、エア圧５ｋｌＪの圧力で金型内に吹き込み、
金型内で２３０℃で９秒保持し、冷部後金型から取り出
して３００ｍｍｘ３００ｍｍ×１０１０１ｌ１のフェラ
イトの多孔質材を取り出し、その電波吸収特性を測定し
た。その結果を第３図ならびに第１表に示した。このよ
うに１０Ｉｌｌａｌの厚みのものはテレビ等の周波数範
囲では２０ｔｌｌＢ以上の電波吸収特性を示した。Next, the resin composition-coated particles were put into a 70-inch molding machine and blown into the mold with an air pressure of 5 klJ.
The mold was held at 230° C. for 9 seconds, and after the cooling part was removed from the mold, a porous ferrite material measuring 300 mm x 300 mm x 10101 l1 was taken out and its radio wave absorption characteristics were measured. The results are shown in FIG. 3 and Table 1. As described above, a material with a thickness of 10 Illal exhibited a radio wave absorption characteristic of 20 tllB or more in the frequency range of television and the like.
実施例２゜
実施例１の製造法と材料組成に従ってフェノールレジン
１〜１５％（対粒子）の樹脂量を使用して樹脂組成物被
覆粒子を作成し各々３００ＭＸ３００ｎｗｘ５ｍｍのフ
ェライト多孔質材を作成し、その電波吸収特性を測定し
た。そ４の結果を第１表に示した。Example 2 According to the manufacturing method and material composition of Example 1, resin composition-coated particles were prepared using a resin composition of 1 to 15% (to particles) of phenol resin, and ferrite porous materials of 300 MX 300 nw x 5 mm were each prepared, We measured its radio wave absorption characteristics. The results of Part 4 are shown in Table 1.
第１表によれば、５ ｍｍ材であっても８０〜１００１
００Ｏ０の領域で優れた電波吸１ｆ！２￥１性（発明の
効果〉
以上詳しく説明した通り、本発明は、粒子径２０〜５０
０μｍのフェライト粒子の表面に、このフェライト粒子
に対し１〜１０重量％の熱硬化性樹脂未硬化物と、この
未硬化物の硬化に０聾な伍の硬化剤等の混合物を被覆し
、フェライト粒子が粘着しない状態とした後、金型内で
加熱硬化させることを特徴とする。According to Table 1, even for 5 mm material, it is 80 to 1001
Excellent radio wave absorption 1f in the 00O0 area! 2￥1 properties (effects of the invention) As explained in detail above, the present invention provides particle diameters of 20 to 50
The surface of 0 μm ferrite particles is coated with a mixture of 1 to 10% by weight of an uncured thermosetting resin based on the ferrite particles, and a curing agent that is 0% deaf to curing this uncured material. It is characterized in that the particles are made into a non-adhesive state and then heated and hardened in a mold.
従って、粒子径２０〜５００μｍのフェライト粒子の表
面に熱硬化性樹脂未硬化物とこの未硬化物の硬化に必要
な量の硬化剤等の混合物を被覆し、金型内で加熱硬化さ
せるようにしたため、得られたものは５〜５０ｄＢの電
波吸収性と５００〜１５００日２の周波帯で０．７以上
の吸音率が得られ、電波吸収性と吸音性とを同時に達成
することができる優れた材料が提供される。Therefore, the surface of ferrite particles with a particle size of 20 to 500 μm is coated with a mixture of an uncured thermosetting resin and a curing agent in an amount necessary for curing this uncured material, and the mixture is heated and cured in a mold. Therefore, the obtained product has a radio wave absorption of 5 to 50 dB and a sound absorption coefficient of 0.7 or more in the frequency band of 500 to 1500 days2, and is an excellent product that can simultaneously achieve radio wave absorption and sound absorption. materials will be provided.
第１図は本発明を実施する際に用いられる金型の斜視図
、第２図は第１図の側面図、第３図は本発明の実施例の
中心周波数と残ＶＩ室法吸音率との関係を示すグラフ、
第４図は電波吸収機器の電波吸収測定用サンプルの配置
図、第５図は電波吸収性特性の測定方法のブロック図で
ある。
符号１・・・・・・金型
２・・・・・・かき板
３・・・・・・フェライト粒子Fig. 1 is a perspective view of a mold used in carrying out the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 shows the center frequency and residual VI room method sound absorption coefficient of an embodiment of the present invention. A graph showing the relationship between
FIG. 4 is a layout diagram of a sample for measuring radio wave absorption of a radio wave absorption device, and FIG. 5 is a block diagram of a method for measuring radio wave absorption characteristics. Code 1... Mold 2... Scraping plate 3... Ferrite particles
Claims (1)
、このフエライト粒子に対し１〜１０重量％の熱硬化性
樹脂未硬化物と、この未硬化物の硬化に必要な量の硬化
剤等の混合物を被覆し、前記フエライト粒子が粘着しな
い状態とした後、金型内で加熱硬化させることを特徴と
する吸音性ならびに電波吸収性を具えた材料の製造法。 ２）前記フエライト粒子が粘着しないように滑剤を添加
する請求項１記載の吸音性ならびに電波吸収性を具えた
材料の製造法。 ３）前記フエライト粒子表面に熱硬化性樹脂の被覆時の
温度が熱硬化温度以下で処理し、その後、急冷する請求
項１又は２記載の吸音性ならびに電波吸収性を具えた材
料の製造法。[Scope of Claims] 1) On the surface of ferrite particles having a particle size of 20 to 500 μm, an uncured thermosetting resin of 1 to 10% by weight based on the ferrite particles and an amount necessary for curing the uncured material. A method for producing a material having sound-absorbing properties and radio wave-absorbing properties, characterized in that the ferrite particles are coated with a mixture of a curing agent, etc. to make the ferrite particles non-adhesive, and then heated and cured in a mold. 2) The method for producing a material having sound absorbing properties and radio wave absorbing properties according to claim 1, wherein a lubricant is added to prevent the ferrite particles from sticking. 3) The method for producing a material having sound absorbing properties and radio wave absorbing properties according to claim 1 or 2, wherein the ferrite particles are coated with a thermosetting resin at a temperature below the thermosetting temperature, and then rapidly cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18192389A JPH0346399A (en) | 1989-07-14 | 1989-07-14 | Manufacture of material provided with sound absorbing and wave absorbing properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18192389A JPH0346399A (en) | 1989-07-14 | 1989-07-14 | Manufacture of material provided with sound absorbing and wave absorbing properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0346399A true JPH0346399A (en) | 1991-02-27 |
Family
ID=16109269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18192389A Pending JPH0346399A (en) | 1989-07-14 | 1989-07-14 | Manufacture of material provided with sound absorbing and wave absorbing properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0346399A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05291785A (en) * | 1992-04-13 | 1993-11-05 | Nec Corp | Electric wave absorber |
| JPH05299870A (en) * | 1992-04-20 | 1993-11-12 | Nec Corp | Radio wave absorbing material |
| JPH09162587A (en) * | 1995-12-07 | 1997-06-20 | Honda Motor Co Ltd | Electronic apparatus sealing material |
| WO1997042844A1 (en) * | 1996-05-10 | 1997-11-20 | Shishiai-Kabushikigaisha | Energy conversion composition |
-
1989
- 1989-07-14 JP JP18192389A patent/JPH0346399A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6645586B2 (en) | 1969-05-10 | 2003-11-11 | Shishiai-Kabushikigaisha | Energy conversion composition |
| JPH05291785A (en) * | 1992-04-13 | 1993-11-05 | Nec Corp | Electric wave absorber |
| JPH05299870A (en) * | 1992-04-20 | 1993-11-12 | Nec Corp | Radio wave absorbing material |
| JPH09162587A (en) * | 1995-12-07 | 1997-06-20 | Honda Motor Co Ltd | Electronic apparatus sealing material |
| JP2843288B2 (en) * | 1995-12-07 | 1999-01-06 | 本田技研工業株式会社 | Electronic device sealing material |
| WO1997042844A1 (en) * | 1996-05-10 | 1997-11-20 | Shishiai-Kabushikigaisha | Energy conversion composition |
| US6635327B2 (en) | 1996-05-10 | 2003-10-21 | Shishiai-Kabushikigaisha | Energy conversion composition |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6166640A (en) | Facing material-synthetic resin foam laminate and manufacture thereof | |
| JPH0346399A (en) | Manufacture of material provided with sound absorbing and wave absorbing properties | |
| JPH10290094A (en) | Electromagnetic-wave absorbing material and its manufacture | |
| JP2000269680A (en) | Electromagnetic wave absorbing board | |
| US6259394B1 (en) | Electric wave absorber | |
| US6831223B2 (en) | Electromagnetic shielding plate and electromagnetic shielding structure | |
| CN116335269A (en) | 3D electromagnetic wave-absorbing concrete super structure based on optimized pavement frequency directional steel fibers | |
| JP3708885B2 (en) | Radio wave absorber | |
| JPH0730279A (en) | Wave absorber and its manufacture | |
| JPS62248207A (en) | Wave absorbing material | |
| JPH0292880A (en) | Production of heat resistant and porous acoustical material | |
| JPH0374812A (en) | Ferrite magnetic material | |
| JP3958563B2 (en) | Radio wave absorber and manufacturing method thereof | |
| JP2556756B2 (en) | Composite plate and method of manufacturing the same | |
| JPS6047100B2 (en) | Nonflammable lightweight composite material and its manufacturing method | |
| JPH01252590A (en) | Ceramic cellular board of two layered structure and production thereof | |
| JPH0935918A (en) | Wide band single layer electromagnetic wave absorbing material | |
| JP3974771B2 (en) | Manufacturing method of radio wave absorber | |
| JPH07227813A (en) | Particle board having electromagnetic wave shielding function, and manufacture thereof | |
| JP2003137631A (en) | Porous inorganic formed and hardened material and double-layer porous inorganic formed and hardened material | |
| JPH10245908A (en) | Sound absorbing material | |
| CN116486775A (en) | Microporous composite material with sound absorption and insulation functions | |
| JP2627700B2 (en) | Manufacturing method of non-combustible soundproofing material | |
| JPH07302994A (en) | Manufacture of porous ferrite sintered body provided with radio-wave absorption capability | |
| JPH05204385A (en) | Sound absorbent |