JPH0353339B2 - - Google Patents
Info
- Publication number
- JPH0353339B2 JPH0353339B2 JP58102895A JP10289583A JPH0353339B2 JP H0353339 B2 JPH0353339 B2 JP H0353339B2 JP 58102895 A JP58102895 A JP 58102895A JP 10289583 A JP10289583 A JP 10289583A JP H0353339 B2 JPH0353339 B2 JP H0353339B2
- Authority
- JP
- Japan
- Prior art keywords
- polyurethane foam
- flame
- retardant
- resin emulsion
- absorbing
- 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
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Polyurethanes Or Polyureas (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【発明の詳細な説明】
本発明は、電磁波並びに音波吸収用ポリウレタ
ンフオームに係り、特に、連続気泡構造をもつポ
リウレタンフオームの気泡中に電磁波を吸収する
機能を有するフエライトを充填したもので、難燃
化を併備させた電磁波並びに音波吸収用難燃化ポ
リウレタンフオーム及びその製造方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyurethane foam for absorbing electromagnetic waves and sound waves, and in particular, a polyurethane foam having an open cell structure in which the cells are filled with ferrite having the function of absorbing electromagnetic waves, and is flame retardant. The present invention relates to a flame-retardant polyurethane foam for absorbing electromagnetic waves and sound waves, and a method for manufacturing the same.
ポリウレタンフオームは、音響効果としては吸
音性を有しているために音響設備等には多用され
ているものであるが、近年問題化した電磁波障害
を排除する目的には、電磁波シールド材料を別に
組合せしなければならないものである。従つてシ
ート材料の電磁波シールド材とポリウレタンフオ
ームを重層又は積層して使用しなければならず、
この時ポリウレタンフオームの吸音効果が著しく
低下する欠点がある。 Polyurethane foam is often used in audio equipment because it has sound absorption properties, but in order to eliminate electromagnetic interference, which has become a problem in recent years, it is used in combination with a separate electromagnetic shielding material. It is something that must be done. Therefore, it is necessary to use a sheet material of electromagnetic shielding material and polyurethane foam in a layered or laminated manner.
At this time, there is a drawback that the sound absorption effect of the polyurethane foam is significantly reduced.
かかる欠点を解決する目的で本発明がなされた
ものである。すなわち、ポリウレタンフオームに
対して、電磁波吸収用フエライトと、バインダー
となる合成樹脂エマルジヨン、好ましくはアクリ
ル樹脂、エチレン−酢酸ビニル樹脂の単独又は併
用してなる水分散さらに、無機質系難燃材、好ま
しくは水酸化アルミニウム又は酸化アルミニウム
等と、塩素基を持つた誘導体とを併用した難燃剤
を分散混入せしめた分散液中にて、ポリウレタン
フオームを圧縮して内部空気を排出し、前記分散
液体を吸収させてから、水分を除去したものであ
る。かかる工程を繰返すことによつてポリウレタ
ンフオームの気泡中に電磁波吸収用フエライトが
内部に含浸される。 The present invention has been made to solve these drawbacks. That is, in polyurethane foam, an aqueous dispersion of ferrite for absorbing electromagnetic waves, a synthetic resin emulsion as a binder, preferably an acrylic resin, or an ethylene-vinyl acetate resin, alone or in combination, and an inorganic flame retardant, preferably an inorganic flame retardant. A polyurethane foam is compressed in a dispersion liquid containing a flame retardant containing a combination of aluminum hydroxide or aluminum oxide and a derivative having a chlorine group, and the internal air is discharged, and the dispersion liquid is absorbed. After that, the water was removed. By repeating this process, the electromagnetic wave absorbing ferrite is impregnated into the bubbles of the polyurethane foam.
すなわち、本発明の電磁波並びに音波吸収用難
燃化ポリウレタンフオームは、その実施例が図面
にもみられるように、連続気泡構造をもつポリウ
レタンフオーム１に対して、電磁波吸収材料のフ
エライト２を気泡中に充填し、合せて難燃化した
事を特徴とする。 That is, in the flame-retardant polyurethane foam for absorbing electromagnetic waves and sound waves of the present invention, as shown in the drawings, the flame-retardant polyurethane foam 1 has an open-cell structure, and ferrite 2, which is an electromagnetic wave-absorbing material, is inserted into the cells. It is characterized by being filled and flame retardant.
又、本発明は、電磁波並びに音波吸収用難燃化
ポリウレタンフオームの製造方法において、電波
吸収材料のフエライト粉末２と、バインダーとな
る合成樹脂エマルジヨンと、無機質系難燃材及び
含塩素基化合物誘導体を併用した難燃剤３とを含
む水分散懸濁液を調整し、該水分散懸濁液中に、
連続気泡構造をもつポリウレタンフオーム１を浸
漬し、該フオームの圧縮及び解放を繰返して内部
空気を排出し、前記水分散懸濁液を充分に吸収さ
せてから水分を除去することを特徴とする。 The present invention also provides a method for producing a flame-retardant polyurethane foam for absorbing electromagnetic waves and sound waves, in which ferrite powder 2 as a radio wave absorbing material, a synthetic resin emulsion as a binder, an inorganic flame retardant and a chlorine-containing compound derivative are used. An aqueous dispersion suspension containing the flame retardant 3 used in combination is prepared, and in the aqueous dispersion suspension,
The method is characterized in that a polyurethane foam 1 having an open cell structure is immersed, the foam is repeatedly compressed and released to expel internal air, and the water is removed after the water-dispersed suspension is sufficiently absorbed.
又、本発明では、ここで、バインダーとなる合
成樹脂エマルジヨンが、アクリル樹脂エマルジヨ
ン及び／又はエチレン−酢酸ビニル樹脂エマルジ
ヨンであり、無機質系難燃材が、水酸化アルミニ
ウム又は酸化アルミニウムであり、さらに、含塩
素基化合物誘導体が、塩素化パラフインであるこ
とを特徴とする。 Further, in the present invention, the synthetic resin emulsion serving as the binder is an acrylic resin emulsion and/or an ethylene-vinyl acetate resin emulsion, the inorganic flame retardant is aluminum hydroxide or aluminum oxide, and further, The chlorine-containing compound derivative is a chlorinated paraffin.
本発明の１実施例としてポリウレタンフオーム
の３〜５mm厚さのシートに対して、
電磁波吸収用フエライト 20〜50重量部
アクリル樹脂エマルジヨン 10 〃
エチレン−酢酸ビニル樹脂エマルジヨン５ 〃
水酸化アルミニユーム 30〜50 〃
塩素化パラフイン ５〜10 〃
水 100〜300 〃
上記の分散液中にて、ポリウレタンフオームを
浸漬后、圧縮して空気を排出して、液体をウレタ
ンフオーム中に含浸させる作業を２回繰返して行
う。しかる後液中から引き上げ水を切り乾燥す
る。 As an example of the present invention, for a sheet of polyurethane foam having a thickness of 3 to 5 mm, 20 to 50 parts by weight of electromagnetic wave absorbing ferrite 10 parts by weight of acrylic resin emulsion 5 parts of ethylene-vinyl acetate resin emulsion 5 parts of aluminum hydroxide 30 to 50 parts by weight Chlorinated paraffin 5-10 Water 100-300 After immersing the polyurethane foam in the above dispersion, compress it to expel the air and impregnate the liquid into the urethane foam by repeating the process twice. . After that, take it out of the liquid, drain the water, and dry it.
本発明では、ポリウレタンフオーム内部の空隙
を利用し、かつ電磁波シールド用フエライト並び
に難燃剤を合成樹脂エマルジヨンで固着させるこ
とにより、電磁波遮蔽の効果があると共に、ポリ
ウレタンフオームの空隙と表面粗度により吸音効
果が保持されているものである。 In the present invention, by utilizing the voids inside the polyurethane foam and fixing the ferrite for electromagnetic shielding and the flame retardant with a synthetic resin emulsion, there is an effect of shielding electromagnetic waves, as well as a sound absorption effect due to the voids and surface roughness of the polyurethane foam. is maintained.
ポリウレタンフオームの吸音効果と共に、電磁
波シールド材を内蔵したシートを電磁波遮蔽する
機器のパネルの内側に、本発明によるポリウレタ
ンフオームを張り付けることにより、機器より発
生する高周波域の電波を遮蔽すると共に、内部に
発生する音響を吸音するために音波の漏洩を著し
く遮断する効果が顕著である。 In addition to the sound-absorbing effect of polyurethane foam, by attaching the polyurethane foam according to the present invention to the inside of the panel of a device that shields electromagnetic waves with a sheet containing a built-in electromagnetic wave shielding material, it can shield radio waves in the high frequency range generated by the device and protect the interior of the device. The effect of significantly blocking the leakage of sound waves is remarkable because it absorbs the sounds generated in the air.
以上述べたように、電磁波障害を受ける、超短
波受信器の外周面を本発明の電磁波吸収用ポリウ
レタンフオームで包んだ時、外的な電磁波障害を
受けない事と共に、自身の発生する電磁波を著し
く遮断する事が判明した。 As mentioned above, when the outer peripheral surface of the ultra-high frequency receiver, which is subject to electromagnetic interference, is wrapped with the electromagnetic wave absorbing polyurethane foam of the present invention, it will not be affected by external electromagnetic interference, and will significantly block the electromagnetic waves it generates. It turned out that it does.
すなわち、本発明では、それ自体、電磁波並び
に音波を吸収し、しかも難燃性を保持する、いわ
ば、一石二鳥の効果を奏するものが容易に得られ
る。 That is, according to the present invention, it is possible to easily obtain a material that itself absorbs electromagnetic waves and sound waves and also maintains flame retardancy, which has the effect of killing two birds with one stone.
第１図は本発明の一実施例の電磁波吸収用ポリ
ウレタンフオームシートの断面略図であり、第２
図は同じくその部分拡大断面略図である。
１……ポリウレタンフオーム、２……電磁波遮
蔽用フエライト、３……難燃剤。
FIG. 1 is a schematic cross-sectional view of a polyurethane foam sheet for electromagnetic wave absorption according to an embodiment of the present invention, and FIG.
The figure is also a partially enlarged schematic cross-sectional view. 1... Polyurethane foam, 2... Ferrite for shielding electromagnetic waves, 3... Flame retardant.
Claims (1)
対して、電磁波吸収材料のフエライトを気泡中に
充填し、合せて難燃化した事を特徴とした電磁波
並びに音波吸収用難燃化ポリウレタンフオーム。 ２ 電磁波並びに音波吸収用難燃化ポリウレタン
フオームの製造方法において、 電磁波吸収材料のフエライト粉末と、バインダ
ーとなる合成樹脂エマルジヨンと無機質系難燃材
及び含塩素基化合物誘導体を併用した難燃剤とを
含む水分散懸濁液を調整し、該水分散懸濁液中
に、連続気泡構造をもつポリウレタンフオームを
浸漬し、該フオーム圧縮及び解放を繰返して内部
空気を排出し、前記水分散懸濁液を充分に吸収さ
せてから水分を除去することを特徴とする電磁波
並びに音波吸収用難燃化ポリウレタンフオームの
製造方法。 ３ バインダーとなる合成樹脂エマルジヨンが、
アクリル樹脂エマルジヨン及び／又はエチレン−
酢酸ビニル樹脂エマルジヨンであり、無機質系難
燃材が、水酸化アルミニウム又は酸化アルミニウ
ムであり、さらに、含塩素基化合物誘導体が、塩
素化パラフインであることを特徴とする特許請求
の範囲第２項記載の電磁波並びに音波吸収難燃化
ポリウレタンフオームの製造方法。[Scope of Claims] 1. A flame-retardant polyurethane for absorbing electromagnetic waves and sound waves, characterized in that a polyurethane foam with an open-cell structure is filled with ferrite, an electromagnetic wave-absorbing material, to make the cells flame-retardant. form. 2. A method for producing a flame-retardant polyurethane foam for absorbing electromagnetic waves and sound waves, which includes ferrite powder as an electromagnetic wave-absorbing material, a synthetic resin emulsion as a binder, and a flame retardant using a combination of an inorganic flame retardant and a chlorine-containing compound derivative. A water-dispersed suspension is prepared, a polyurethane foam having an open cell structure is immersed in the water-dispersed suspension, and the foam is repeatedly compressed and released to expel the internal air. A method for producing a flame-retardant polyurethane foam for absorbing electromagnetic waves and sound waves, which comprises removing moisture after sufficient absorption. 3 The synthetic resin emulsion that serves as the binder is
Acrylic resin emulsion and/or ethylene
Claim 2, characterized in that it is a vinyl acetate resin emulsion, the inorganic flame retardant is aluminum hydroxide or aluminum oxide, and the chlorine-containing compound derivative is chlorinated paraffin. A method for producing a flame-retardant polyurethane foam that absorbs electromagnetic waves and sound waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10289583A JPS59227920A (en) | 1983-06-10 | 1983-06-10 | Polyurethane foam for electromagnetic wave absorption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10289583A JPS59227920A (en) | 1983-06-10 | 1983-06-10 | Polyurethane foam for electromagnetic wave absorption |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59227920A JPS59227920A (en) | 1984-12-21 |
| JPH0353339B2 true JPH0353339B2 (en) | 1991-08-14 |
Family
ID=14339592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10289583A Granted JPS59227920A (en) | 1983-06-10 | 1983-06-10 | Polyurethane foam for electromagnetic wave absorption |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59227920A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01207995A (en) * | 1988-02-16 | 1989-08-21 | Meidensha Corp | Construction method of radio wave-acoustic wave anechoic room |
| DE19947130C1 (en) * | 1999-09-30 | 2000-11-02 | Siemens Ag | Electrical equipment unit with components in housing and with external electromagnetic screening |
| JP3448012B2 (en) * | 2000-05-02 | 2003-09-16 | 敏秀 北澤 | Electromagnetic wave absorber and method of manufacturing the same |
| JP5014529B2 (en) * | 2000-07-18 | 2012-08-29 | 株式会社イノアックコーポレーション | Conductive porous material having flame retardancy and method for producing the same |
| KR20020080152A (en) * | 2001-04-12 | 2002-10-23 | 고상남 | Composition ingredients of polyurethane form for shielding of electromagnetic wave, and manufacture method |
| US7060348B2 (en) * | 2002-03-08 | 2006-06-13 | Laird Technologies, Inc. | Flame retardant, electrically conductive shielding materials and methods of making the same |
| KR20080005241A (en) * | 2005-03-30 | 2008-01-10 | 파커-한니핀 코포레이션 | Flame retardant foam for emi shielding gaskets |
| JP4973636B2 (en) * | 2008-10-08 | 2012-07-11 | 金山化成株式会社 | Method for producing foamed resin composite structure |
| CN110862671B (en) * | 2018-08-27 | 2021-02-19 | 北京化工大学 | Metal organic framework material/polyurethane wave-absorbing material and preparation method thereof |
| CN112126116B (en) * | 2020-08-24 | 2022-10-11 | 航天特种材料及工艺技术研究所 | A kind of wave-absorbing polyurethane sponge/rigid foam composite material and preparation method thereof |
-
1983
- 1983-06-10 JP JP10289583A patent/JPS59227920A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59227920A (en) | 1984-12-21 |
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