JP2000065134A - Vibration reducing material - Google Patents
Vibration reducing materialInfo
- Publication number
- JP2000065134A JP2000065134A JP10253258A JP25325898A JP2000065134A JP 2000065134 A JP2000065134 A JP 2000065134A JP 10253258 A JP10253258 A JP 10253258A JP 25325898 A JP25325898 A JP 25325898A JP 2000065134 A JP2000065134 A JP 2000065134A
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- materials
- porous member
- sound
- vibration reducing
- 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
Landscapes
- Vibration Prevention Devices (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、振動低減能に優れて情報
記録電子装置のドライバ等における防音材や制振材など
として好適な振動低減材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-reducing material which has excellent vibration-reducing ability and is suitable as a soundproofing material or a vibration damping material for a driver of an information recording electronic device.
【０００２】[0002]
【従来の技術】振動の吸収や反射等により防音や防振等
の作用を示す振動低減材が、例えば防音材や吸音材や遮
音材、あるいは制振材や防振材、さらにはそれらの複合
機能材等として種々の目的で使用されている。ちなみに
パソコン等におけるＨＤＤ（ハードディスクドライブ）
やＤＶＤＤ（デジタルビデオディスクドライブ）、ＣＤ
Ｄ（コンパクトディスクドライブ）では、駆動時のモー
タ音やディスクの風切音等が発生してオペレータや装置
近隣者に対する騒音となるため、ドライブ本体と基板の
間に振動低減材を防音材として配置して発生音の低減が
図られている。2. Description of the Related Art Vibration-reducing materials exhibiting soundproofing and vibration-proofing functions by absorbing and reflecting vibrations, such as soundproofing materials, sound absorbing materials and soundproofing materials, or vibration damping materials and vibrationproofing materials, and composites thereof. It is used for various purposes as a functional material. By the way, HDD (hard disk drive) in personal computers etc.
And DVDD (Digital Video Disk Drive), CD
In D (Compact Disk Drive), the noise of the motor and the wind noise of the disk during driving, etc. are generated and become a noise for the operator and the neighbors of the device. Therefore, the vibration reduction material is placed as a soundproof material between the drive body and the board. Thus, the generated sound is reduced.
【０００３】従来、前記の振動低減材としては、ポリウ
レタンフォーム等からなる発泡体が知られていたが、そ
れを防音材として用いた場合、漏れ音が大きくて防音効
果に乏しい問題点があった。そのため、発泡体の静バネ
定数を限定したもの、発泡体の気泡内壁面に微細凹凸の
ポリマー膜を付設したもの、発泡体の外表面をフィルム
で被覆したもの、フィルムに樹脂等のメルトブロー層を
積層したものなどが提案されている（特開昭５６−１５
７３４７号公報、特開昭５９−１０２２９４号公報、特
開平４−４０３８１号公報、特開平４−３４５８３４号
公報、特開平７−２６１７６８号公報）。Conventionally, a foam made of polyurethane foam or the like has been known as the above-mentioned vibration reducing material. However, when it is used as a soundproofing material, there is a problem that the sound leakage is large and the soundproofing effect is poor. . For this reason, those having a limited static spring constant of the foam, those having a polymer film of fine irregularities attached to the inner wall surface of the foam, those having the outer surface of the foam covered with a film, and those having a melt-blown layer of resin or the like on the film. Laminated ones have been proposed (JP-A-56-15).
7347, JP-A-59-102294, JP-A-4-40381, JP-A-4-345834, and JP-A-7-261768.
【０００４】しかしながら、従来のいずれの振動低減材
にあっても振動の低減能に乏しく、例えば防音材として
使用した場合に防音等による消音効果に不充分で満足で
きる騒音防止を達成できず、微細凹凸のポリマー膜の付
設物等では製造工程も複雑で製造効率に乏しい問題点が
あった。[0004] However, any of the conventional vibration reducing materials has a poor vibration reducing ability. For example, when used as a soundproofing material, the noise reduction effect by soundproofing or the like is insufficient, and satisfactory noise prevention cannot be achieved. In the case of an article provided with an uneven polymer film, there is a problem that the manufacturing process is complicated and the manufacturing efficiency is poor.
【０００５】[0005]
【発明の技術的課題】本発明は、振動低減能に優れて高
度な防音や防振等の作用を示し、狭小空間等にも容易に
適用できて製造効率にも優れ、防音材や制振材等の種々
の目的に用いうる振動低減材の開発を課題とする。The present invention is excellent in vibration reduction capability and exhibits advanced soundproofing and vibration-proofing effects, can be easily applied to small spaces, etc., has excellent manufacturing efficiency, and has excellent soundproofing and vibration-damping properties. It is an object of the present invention to develop a vibration reducing material that can be used for various purposes such as a material.
【０００６】[0006]
【課題の解決手段】本発明は、１．０〜３．０ｋＨｚの
周波数領域において、特性インピーダンスの絶対値が８
００kg／m2・S以上の多孔質部材からなることを特徴とす
る振動低減材を提供するものである。According to the present invention, an absolute value of a characteristic impedance is set to 8 in a frequency range of 1.0 to 3.0 kHz.
An object of the present invention is to provide a vibration-reducing material comprising a porous member of at least 00 kg / m 2 · S.
【０００７】[0007]
【発明の効果】本発明の振動低減材によれば、製造効率
に優れると共に、上記のインピーダンス特性を示す多孔
質部材がそれに入射した音等の振動に対し優れた低減能
を発揮する。従って優れた消音効果や防振効果等を示し
て高度な騒音防止や振動防止等を達成できる例えば防音
材や吸音材や遮音材、制振材や防振材、あるいはそれら
の複合機能材などの種々の目的に用いうる振動低減材を
得ることができる。また圧縮性の多孔質部材を用いるこ
とにより、狭小空間等にも容易に装着でき、振動低減材
の肉厚化による装置全体の大型化を抑制することができ
る。According to the vibration reducing material of the present invention, the manufacturing efficiency is excellent, and the porous member having the above-mentioned impedance characteristics exhibits an excellent reducing ability against vibrations such as sound incident on the porous member. Therefore, it is possible to achieve a high level of noise prevention and vibration prevention, etc. by exhibiting an excellent noise reduction effect and vibration damping effect, for example, a sound insulating material, a sound absorbing material, a sound insulating material, a vibration damping material, a vibration damping material, or a composite functional material thereof. Vibration reducing materials that can be used for various purposes can be obtained. In addition, by using a compressible porous member, it can be easily mounted in a narrow space or the like, and it is possible to suppress an increase in the size of the entire apparatus due to an increase in the thickness of the vibration reducing material.
【０００８】前記において、減衰定数をα、周波数をｆ
として式：α≧０．０１ｆneper／ｍを満足する場合に
は、消音や防振等の効果が飛躍的に向上してさらに高度
な騒音防止や振動防止等を達成することができる。また
５０％圧縮時の反発応力が１０〜２００ｇｆ／cm2の多
孔質部材を用いた場合には、隣接部材の変形等を防止し
つつ狭小空間等にもより容易に装着でき、かつ製造も容
易である。In the above, the attenuation constant is α and the frequency is f
When the expression: α ≧ 0.01 fneper / m is satisfied, the effects such as noise reduction and vibration proof are dramatically improved, and more advanced noise prevention and vibration prevention can be achieved. In addition, when a porous member having a rebound stress at 50% compression of 10 to 200 gf / cm 2 is used, it can be easily mounted in a narrow space or the like while preventing deformation of an adjacent member, and is easy to manufacture. It is.
【０００９】[0009]
【発明の実施形態】本発明による振動低減材は、１．０
〜３．０ｋＨｚの周波数領域において、特性インピーダ
ンスの絶対値が８００kg／m2・S以上の多孔質部材からな
る。消音効果や防振効果等の点よりは当該絶対値が１０
００kg／m2・S以上、就中１２００kg／m2・S以上、特に２
０００〜１３０００kg／m2・Sの多孔質部材が好ましい。BEST MODE FOR CARRYING OUT THE INVENTION
It is made of a porous member having an absolute value of characteristic impedance of 800 kg / m 2 · S or more in a frequency range of up to 3.0 kHz. The absolute value is 10 from the point of the noise reduction effect and the vibration proof effect
00kg / m 2 · S or more, especially 1200 kg / m 2 · S or more, especially 2
A porous member of 000 to 13000 kg / m 2 · S is preferred.
【００１０】用いる多孔質部材は、前記の特性を示すも
のであればよい。従って多孔質部材としては、例えば天
然や合成の有機や無機の適宜な繊維を不織布状等に集成
してなる繊維集合体、あるいはオレフィン系やウレタン
系、アクリル系や塩化ビニル系、ＳＢＲ系やＮＲ系、Ｎ
ＢＲ系やそれらのブレンド系等の発泡体などの適宜なも
のを用いうる。振動低減材は、２種以上の多孔質部材の
積層体や混合層などとして形成されていてもよい。なお
発泡体は、防音、防振等の効果や変形防止などの点より
セルの３０％以上が連続気泡系構造であることが好まし
い。[0010] The porous member used may be one having the above-mentioned characteristics. Therefore, as the porous member, for example, a fiber aggregate formed by assembling appropriate natural or synthetic organic or inorganic fibers into a nonwoven fabric or the like, or an olefin, urethane, acrylic, vinyl chloride, SBR, or NR System, N
Appropriate materials such as foams such as BR and blends thereof can be used. The vibration reducing material may be formed as a laminate or a mixed layer of two or more porous members. The foam preferably has an open cell structure in which 30% or more of the cells have an open-cell structure from the viewpoints of soundproofing, vibration-proofing, deformation prevention and the like.
【００１１】上記した条件等の点より好ましく用いうる
多孔質部材は、エチレン、プロピレンやブテン−１の如
きα−オレフィン、及びジシクロペンタジエンやエチリ
デンノルボルネンの如き非共役二重結合を有する環状又
は非環状のポリエンを成分とする共重合体、就中エチレ
ン４５〜７０モル％、α−オレフィン５〜２０モル％、
ポリエン５０〜１０モル％のもの、特にムーニー粘度Ｍ
Ｌ1+2（１００℃）が３０〜１１０のものからなるＥＰ
ＤＭ系発泡体である。The porous member which can be preferably used in view of the above conditions and the like includes α-olefins such as ethylene, propylene and butene-1 and cyclic or non-conjugated double bonds such as dicyclopentadiene and ethylidene norbornene. A copolymer containing a cyclic polyene as a component, particularly 45 to 70 mol% of ethylene, 5 to 20 mol% of α-olefin,
Polyene 50 to 10 mol%, especially Mooney viscosity M
EP with L 1 + 2 (100 ° C) of 30 to 110
It is a DM foam.
【００１２】また前記のＥＰＤＭを併用したゴム系発泡
体も好ましく用いうる。この場合にＥＰＤＭ以外のゴム
成分としては、例えば天然ゴムやブチルゴム、クロロプ
レンゴムやアクリルゴム、スチレン・ブタジエンゴムや
ニトリル・ブタジエンゴムなどの適宜なものを用いう
る。なおＥＰＤＭの使用量は、耐候性や耐久性などの点
より全ゴム成分の２０重量％以上であることが好まし
い。A rubber foam using the above-mentioned EPDM is also preferably used. In this case, as the rubber component other than EPDM, an appropriate rubber component such as natural rubber, butyl rubber, chloroprene rubber, acrylic rubber, styrene / butadiene rubber, or nitrile / butadiene rubber can be used. The amount of EPDM used is preferably 20% by weight or more of the total rubber component from the viewpoints of weather resistance and durability.
【００１３】本発明の条件を満足するＥＰＤＭ系等の発
泡体の製造は、例えばゴム成分に発泡剤や加硫剤等の適
宜な添加剤を配合した混和物をシート等に成形して発泡
加硫処理した後、セルの一部又は全部を圧縮処理等の適
宜な手段で破泡させるなどの物性調節処理を施す方法な
どにより行うことができる。In order to produce an EPDM foam or the like which satisfies the conditions of the present invention, for example, a mixture of a rubber component and an appropriate additive such as a foaming agent or a vulcanizing agent is molded into a sheet or the like to form a foam. After the sulfurizing treatment, a method of subjecting some or all of the cells to a physical property adjustment treatment such as foam breaking by an appropriate means such as a compression treatment can be used.
【００１４】前記の発泡剤としては、例えばアゾジカル
ボンアミドやジニトロソペンタメチレンテトラミン、炭
酸水素ナトリウムや４，４'-オキシビス（ベンゼンスル
ホニルセミカルバジド）の如きアゾ系やＮ−ニトロソ
系、無機系やセミカルバジド系、その他ヒドラジン系や
トリアゾール系などの適宜なものを用いうる。発泡剤の
使用量は、目的とする物性を得るための発泡倍率などの
点より、ゴム成分１００重量部あたり５〜５０重量部が
好ましい。Examples of the foaming agent include azo-based, N-nitroso-based, inorganic and semi-carbazide such as azodicarbonamide, dinitrosopentamethylenetetramine, sodium hydrogen carbonate and 4,4'-oxybis (benzenesulfonylsemicarbazide). And hydrazine-based and triazole-based ones. The amount of the foaming agent to be used is preferably 5 to 50 parts by weight per 100 parts by weight of the rubber component from the viewpoint of the expansion ratio for obtaining the desired physical properties.
【００１５】また加硫剤としては、硫黄やＰ−キノンジ
オキシム、Ｐ，Ｐ'-ジベンゾイルキノンジオキシムや
４，４'-ジチオジモルホリン、Ｐ−ジニトロソベンジン
や安息香酸アンモニウム、Ｎ，Ｎ'-ｍ−フェニレンジマ
レイミドなどの適宜なものを用いうる。加硫剤の使用量
は、加硫不足やガス抜け等の発泡阻害を防止した、目的
とする物性を得る点などより、ゴム成分１００重量部あ
たり１〜３０重量部が好ましい。Examples of the vulcanizing agent include sulfur, P-quinone dioxime, P, P'-dibenzoylquinone dioxime, 4,4'-dithiodimorpholine, P-dinitrosobenzine, ammonium benzoate, N, Appropriate materials such as N'-m-phenylenedimaleimide can be used. The amount of the vulcanizing agent to be used is preferably 1 to 30 parts by weight per 100 parts by weight of the rubber component from the viewpoint of obtaining desired physical properties while preventing foaming inhibition such as insufficient vulcanization and outgassing.
【００１６】上記した混和物の調製に際しては、例えば
尿素系やサリチル酸系や安息香酸系の如き適宜な発泡助
剤、アルデヒドアンモニア系やアルデヒドアミン系、チ
オウレア系やグアニジン系、チアゾール系やスルフェン
アミド系、チウラム系やジチオカルバミン酸塩系、キサ
ントゲン酸塩系の如き適宜な加硫助剤を必要に応じて用
いうる。In preparing the above-mentioned admixture, an appropriate foaming aid such as urea-based, salicylic-acid-based and benzoic acid-based, aldehyde ammonia-based, aldehydeamine-based, thiourea-based, guanidine-based, thiazole-based, and sulfenamide-based A suitable vulcanization aid such as a thiuram-based, dithiocarbamate-based, or xanthate-based can be used as necessary.
【００１７】また例えば、炭酸カルシウム、タルク、ク
レー、雲母粉、水酸化アルミニウムや水酸化マグネシウ
ムの如き金属水酸化物、酸化アルミニウムや酸化亜鉛の
如き金属酸化物等からなる充填剤、パラフィン系やナフ
テン系、アロマ系やアスファルト系等の軟化剤などの添
加剤も混和物の調製に際し必要に応じて配合することが
できる。Further, for example, fillers composed of calcium carbonate, talc, clay, mica powder, metal hydroxides such as aluminum hydroxide and magnesium hydroxide, metal oxides such as aluminum oxide and zinc oxide, paraffinic and naphthenic Additives such as a softening agent such as a softening agent, an aroma-based or an asphalt-based softening agent can be added as needed in the preparation of the mixture.
【００１８】前記において、充填剤の使用量は、強度等
の物性制御などの点よりゴム成分１００重量部あたり３
０〜３００重量部が好ましい。また軟化剤の使用量は、
発泡性に関係する混和物の粘度の調節やブルーミングの
防止性などの点よりゴム成分１００重量部あたり１０〜
３００重量部が好ましい。In the above, the amount of the filler used is 3 parts per 100 parts by weight of the rubber component in view of controlling physical properties such as strength.
0 to 300 parts by weight is preferred. The amount of softener used is
10 to 100 parts by weight of the rubber component from the viewpoint of adjusting the viscosity of the admixture related to foaming properties and preventing blooming.
300 parts by weight are preferred.
【００１９】本発明に用いる上記ＥＰＤＭ系等の発泡体
としては、例えば剥離ライナ上に混和物を０．５〜５０
mmの厚さで展開し、それを１００〜２００℃の温度で１
０〜６０分間加熱処理するなどして、発泡倍率３〜３０
倍、就中５〜１５倍、特に８〜１３倍となるように発泡
加硫処理したものが好ましく用いうる。発泡倍率が３倍
未満では、圧縮反発力が大きくて狭小空間等への配置が
困難な場合があり、３０倍を超えると特性インピーダン
スの制御が困難となって満足できる防音や防振等の性能
が得られない場合がある。The EPDM foam or the like used in the present invention may be, for example, a mixture of 0.5 to 50
unfold at a temperature of 100-200 ° C.
By performing a heat treatment for 0 to 60 minutes, the expansion ratio is 3 to 30.
Those subjected to foam vulcanization so as to have a factor of, especially 5 to 15 times, especially 8 to 13 times, can be preferably used. If the expansion ratio is less than 3 times, it may be difficult to arrange in a narrow space due to a large compression repulsion force. If the expansion ratio is more than 30 times, it becomes difficult to control the characteristic impedance, and satisfactory performance such as soundproofing and vibrationproofing can be obtained. May not be obtained.
【００２０】また本発明において好ましく用いうる多孔
質部材としては、ポリウレタン、ポリエチレン、ポリ塩
化ビニル等の適宜な熱可塑性樹脂や、ブチルゴムやイソ
プレンゴム等の適宜なゴム系ポリマーなどからなる、比
重が０．０１〜０．９、就中０．０１６〜０．１の連泡
系発泡体に、アクリル系やポリブチラール系やポリエス
テル系などの適宜な樹脂を含浸させて、上記したインピ
ーダンス特性のものとしたものなどもあげられる。その
場合、樹脂の含浸量は特性インピーダンス等に応じて適
宜に決定しうるが、一般には０．０１〜１．０ｇ／c
m3、就中０．０２〜０．１ｇ／cm3程度とされる。The porous member which can be preferably used in the present invention includes a suitable thermoplastic resin such as polyurethane, polyethylene and polyvinyl chloride, and a suitable rubber-based polymer such as butyl rubber and isoprene rubber. 0.01 to 0.9, preferably 0.016 to 0.1, and impregnated with a suitable resin such as an acrylic, polybutyral, or polyester resin to obtain the above-mentioned impedance characteristics. There are also things that have been done. In this case, the resin impregnation amount can be appropriately determined according to the characteristic impedance and the like, but is generally 0.01 to 1.0 g / c.
m 3 , especially about 0.02 to 0.1 g / cm 3 .
【００２１】また本発明において、消音や防振等の効果
の点などより好ましく用いうる多孔質部材は、１．０〜
３．０ｋＨｚの周波数領域において、減衰定数をα、周
波数をｆとして、式：α≧０．０１ｆneper／ｍを満足
するものであり、就中０．０２ｆneper／ｍ≦α≦２ｆn
eper／ｍを満足するものである。In the present invention, the porous member which can be more preferably used in terms of effects such as noise reduction and vibration control is 1.0 to 1.0.
In the 3.0 kHz frequency range, the equation: α ≧ 0.01 fneper / m is satisfied, where α is the attenuation constant and f is the frequency, and particularly 0.02 fneper / m ≦ α ≦ 2fn.
eper / m is satisfied.
【００２２】さらに本発明において狭小空間等への装着
性などの点より好ましく用いうる多孔質部材は、上記に
例示したものの如く圧縮性を示すものであるが、その圧
縮性としては５０％圧縮時の反発応力が１０〜２００ｇ
ｆ／cm2、就中２０〜１５０ｇｆ／cm2、特に３０〜１２
０ｇｆ／cm2の圧縮特性を示すものが好ましい。Further, in the present invention, the porous member which can be preferably used from the viewpoint of ease of mounting in a narrow space or the like has a compressibility as exemplified above. Repulsion stress of 10 to 200 g
f / cm 2 , especially 20-150 gf / cm 2 , especially 30-12
Those exhibiting a compression characteristic of 0 gf / cm 2 are preferred.
【００２３】振動低減材の形態は、適用箇所等の使用目
的などに応じて適宜に決定でき、その厚さも任意であ
る。一般には、見掛け厚さに基づいて１００mm以下、就
中０．５〜７０mm、特に１〜４０mmの厚さとされる。な
お振動低減材は、均一厚である必要はなく、部分的に厚
さが異なっていてもよい。The form of the vibration reducing material can be appropriately determined according to the purpose of use, such as the place of application, etc., and its thickness is also arbitrary. Generally, the thickness is 100 mm or less based on the apparent thickness, especially 0.5 to 70 mm, particularly 1 to 40 mm. The vibration reducing material does not need to have a uniform thickness, and may have a partially different thickness.
【００２４】肉厚が部分的に異なる振動低減材は、例え
ば多孔質部材をフレーク状に粉砕するなどして作製した
チップを、その表面に接着剤を塗布するなどして所定の
金型に充填し圧縮成形する方式などにより効率よく形成
することができる。The vibration reducing material having a partially different wall thickness is obtained by, for example, filling a chip prepared by pulverizing a porous member into flakes into a predetermined mold by applying an adhesive to the surface thereof. It can be formed efficiently by a compression molding method or the like.
【００２５】本発明による振動低減材は、例えば所定の
形態に予め形成して図１に例示した如く、ＨＤＤの本体
１と基板３との間等の各種の部材間に介在配置する方式
や空隙に充填配置する方式、あるいはテープ状やシート
状等に形成したものを巻付け方式や貼付け方式等の適宜
な方式で取付ける方式などにて、例えば防音材や吸音材
や遮音材、制振材や防振材、あるいはそれらの複合機能
材などとしての従来に準じた各種の振動伝播の低減処理
に好ましく用いることができる。The vibration-reducing material according to the present invention is formed in advance in a predetermined form, for example, as shown in FIG. 1, and is interposed between various members such as between the main body 1 and the substrate 3 of the HDD or a gap. In a method of filling and arranging, or a method of attaching a tape-shaped or sheet-shaped thing by an appropriate method such as a winding method or a sticking method, for example, a soundproofing material, a sound absorbing material, a sound insulating material, a vibration damping material, It can be preferably used for a conventional vibration-reducing material or a composite functional material for reducing various vibration propagations.
【００２６】就中、前記ＨＤＤやＣＤＤやＤＶＤＤある
いはテープレコーダの如く、ディスクや磁気テープ等の
情報記録媒体とその駆動機構を介して光学的あるいは磁
気的な情報を記録又は再生する情報記録装置等への機器
装着型などとして好ましく用いうる。なお前記の図１に
おいて、符号の２が振動低減材である。In particular, an information recording medium such as a disk or a magnetic tape and an information recording apparatus for recording or reproducing optical or magnetic information through a drive mechanism thereof, such as the HDD, CDD, DVDD or tape recorder. It can be preferably used as a device-attachable type to a device. In FIG. 1, reference numeral 2 denotes a vibration reducing material.
【００２７】[0027]
【実施例】実施例１ エチレン６０モル％、プロピレン１０モル％、ポリエン
３０モル％、ムーニー粘度ＭＬ1+2（１００℃）６５の
ＥＰＤＭ１００部（重量部、以下同じ）、重質炭酸カル
シウム２００部、パラフィン系オイル５０部、ＡＤＣＡ
系有機発泡剤１０部、及び硫黄２．５部をニーダで混練
し、それを剥離ライナ上に１０mmの厚さで展開し、１６
０℃で３０分間加熱して発泡加硫し、発泡倍率が６倍の
独泡系発泡体を得、それを隙間が発泡体厚の１／３のロ
ール間を通過させた後、２mmの厚さにスライスして、振
動低減材を得た。EXAMPLES Example 1 60 parts by weight of ethylene, 10 parts by mole of propylene, 30 parts by weight of polyene, 100 parts of EPDM having Mooney viscosity ML 1 + 2 (100 ° C.) 65 (parts by weight, the same applies hereinafter), 200 parts of heavy calcium carbonate , 50 parts of paraffinic oil, ADCA
10 parts of an organic foaming agent and 2.5 parts of sulfur are kneaded with a kneader and spread on a release liner to a thickness of 10 mm.
The foam was vulcanized by heating at 0 ° C. for 30 minutes to obtain a closed-cell foam having a foaming ratio of 6 times, and the gap was passed between rolls having a thickness of 1/3 of the foam. Slicing was performed to obtain a vibration reducing material.
【００２８】前記で得た振動低減材について２マイクロ
ホン法音響インピーダンス測定装置により、１．０〜
３．０ｋＨｚの周波数領域における、特性インピーダン
スの絶対値（Ｚc）を調べたところ、３．５×１０3kg／
m2・Sであった。The vibration-reducing material obtained above was measured with a two-microphone method acoustic impedance measuring apparatus to obtain a value of 1.0 to 1.0.
When the absolute value (Zc) of the characteristic impedance in the frequency region of 3.0 kHz was examined, 3.5 × 10 3 kg /
m 2 · S.
【００２９】実施例２ ＡＤＣＡ系有機発泡剤に代えて、ＤＰＴ系有機発泡剤２
５部を用いたほかは実施例１に準じて発泡倍率が２０倍
の独泡系発泡体を得、それを隙間が発泡体厚の１／３の
ロール間を通過させた後、２mmの厚さにスライスして、
Ｚcが１．７×１０3kg／m2・Sの振動低減材を得た。Example 2 DPT organic foaming agent 2 was used in place of the ADCA organic foaming agent.
A closed cell foam having a foaming ratio of 20 times was obtained according to Example 1 except that 5 parts were used, and the gap was passed between rolls having a thickness of 1/3 of the foam. Slice it into
A vibration reducing material having a Zc of 1.7 × 10 3 kg / m 2 · S was obtained.
【００３０】実施例３ 比重が０．０５５でセルの平均径が０．３７mmのポリエ
ステル系ウレタン発泡体を形成し、それを２mmの厚さに
スライスしてＺcが１．１×１０3kg／m2・Sの振動低減材
を得た。Example 3 A polyester-based urethane foam having a specific gravity of 0.055 and an average cell diameter of 0.37 mm was formed, and was sliced to a thickness of 2 mm to have a Zc of 1.1 × 10 3 kg /. A vibration reduction material of m 2 · S was obtained.
【００３１】評価試験 減衰定数α 実施例で得た振動低減材について、２マイクロホン法音
響インピーダンス測定装置にて、１．０〜３．０ｋＨｚ
の周波数領域における減衰定数を調べた。Evaluation Test Attenuation Constant α The vibration-reducing material obtained in the example was measured with a 2-microphone acoustic impedance measuring apparatus at 1.0 to 3.0 kHz.
The attenuation constant in the frequency domain of was investigated.
【００３２】５０％圧縮反発力 実施例で得た振動低減材を１００mm／分の速度で５０％
の厚さに圧縮し、１０秒間経過後の反発力を調べた。50% compression repulsive force The vibration-reducing material obtained in the example was reduced by 50% at a speed of 100 mm / min.
, And the repulsive force after a lapse of 10 seconds was examined.
【００３３】音低減量 図２の如く実施例で得た振動低減材をＨＤＤの本体と基
板との間に設置し、それ４２を無音響室内に設けた台４
１の上に載置して駆動源４４を介し駆動させ、装置４２
の上方３００mm（ｄ）離れた位置にマイクロホン４３を
配置してアナライザー４５を介し測音し、振動低減材が
無い場合の音レベルを基準としてＡ特性オーバーオール
値での騒音の低減量を調べた。As shown in FIG. 2, the vibration-reducing material obtained in the embodiment is installed between the main body of the HDD and the substrate, and the sound-reducing material 42 is provided on a table 4 in an acoustic-free room.
1 and driven via a drive source 44 to
The microphone 43 was arranged at a position 300 mm (d) apart from the above, and the sound was measured via the analyzer 45, and the amount of noise reduction at the A-weighted overall value was examined based on the sound level without the vibration reducing material.
【００３４】前記の結果を次表に示した。なお減衰定数
については１．０ｋＨｚ又は３．０ｋＨｚの場合を示し
たが、その中間の周波数領域での減衰定数は、１．０ｋ
Ｈｚと３．０ｋＨｚの場合の中間値であった。 The above results are shown in the following table. The attenuation constant is 1.0 kHz or 3.0 kHz, but the attenuation constant in the intermediate frequency range is 1.0 kHz.
Hz and 3.0 kHz.
【図１】適用例の断面図FIG. 1 is a sectional view of an application example.
【図２】測音試験の説明図FIG. 2 is an explanatory diagram of a sound measurement test.
【符号の説明】 １：ＨＤＤ本体 ２：振動低減材 ３：基板[Description of Signs] 1: HDD main body 2: Vibration reducing material 3: Board
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 和雅 大阪府茨木市下穂積１丁目１番２号 日東 電工株式会社内 (72)発明者 杉原 保則 大阪府茨木市下穂積１丁目１番２号 日東 電工株式会社内 (72)発明者 松永 学 大阪府茨木市下穂積１丁目１番２号 日東 電工株式会社内 Ｆターム(参考） 3J048 AC10 4F074 AA25 BA13 BB01 CA25 CC06Y CD06 DA12 DA24 DA40 DA57 5D061 AA25 BB24 GG01 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kazumasa Tanaka 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (72) Yasunori Sugihara 1-1-2 Shimohozumi, Ibaraki-shi, Osaka No. Nitto Denko Corporation (72) Inventor: Manabu Matsunaga 1-1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Denko Corporation F-term (reference) BB24 GG01
Claims (3)
いて、特性インピーダンスの絶対値が８００kg／m2・S以
上の多孔質部材からなることを特徴とする振動低減材。1. A vibration reduction material comprising a porous member having an absolute value of characteristic impedance of 800 kg / m 2 · S or more in a frequency range of 1.0 to 3.0 kHz.
ｚの周波数領域において、減衰定数をα、周波数をｆと
して、式：α≧０．０１ｆneper／ｍを満足する振動低
減材。2. The method according to claim 1, wherein the pressure is 1.0 to 3.0 kHz.
A vibration reducing material that satisfies the formula: α ≧ 0.01 fneper / m in a frequency range of z, where an attenuation constant is α and a frequency is f.
の反発応力が１０〜２００ｇｆ／cm2である振動低減
材。3. The vibration reducing material according to claim 1, wherein the repulsive stress at 50% compression is 10 to 200 gf / cm 2 .
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10253258A JP2000065134A (en) | 1998-08-24 | 1998-08-24 | Vibration reducing material |
| SG9904158A SG87821A1 (en) | 1998-08-24 | 1999-08-23 | Damping material, damping method and disc drive |
| US09/379,612 US6498700B2 (en) | 1998-08-24 | 1999-08-24 | Damping material, damping method and disc drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10253258A JP2000065134A (en) | 1998-08-24 | 1998-08-24 | Vibration reducing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000065134A true JP2000065134A (en) | 2000-03-03 |
Family
ID=17248782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10253258A Pending JP2000065134A (en) | 1998-08-24 | 1998-08-24 | Vibration reducing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000065134A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014181295A (en) * | 2013-03-19 | 2014-09-29 | Nitto Denko Corp | Vibration-proof material, vibration-proof structure, and vibration-proof method |
-
1998
- 1998-08-24 JP JP10253258A patent/JP2000065134A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014181295A (en) * | 2013-03-19 | 2014-09-29 | Nitto Denko Corp | Vibration-proof material, vibration-proof structure, and vibration-proof method |
| EP2805991A1 (en) | 2013-03-19 | 2014-11-26 | Nitto Denko Corporation | Vibration-proof material, vibration-proof structure, and vibration-proof method |
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