JPH11293019A - Soundproof material - Google Patents
Soundproof materialInfo
- Publication number
- JPH11293019A JPH11293019A JP11619298A JP11619298A JPH11293019A JP H11293019 A JPH11293019 A JP H11293019A JP 11619298 A JP11619298 A JP 11619298A JP 11619298 A JP11619298 A JP 11619298A JP H11293019 A JPH11293019 A JP H11293019A
- Authority
- JP
- Japan
- Prior art keywords
- parts
- weight
- ratio
- poisson
- foaming
- 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.)
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Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【0001】[0001]
【発明の技術分野】本発明は、自動車や建築物、住設機
器や電気・電子機器等の各種物品の防音処理に好適な防
音材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing material suitable for soundproofing various articles such as automobiles, buildings, housing equipment and electric and electronic equipment.
【0002】[0002]
【従来の技術】従来、防音材としては、内部損失を示す
指標であるtanδに基づいてその値の高い材料にて形成
した発泡体や繊維集成物が知られていた。しかしなが
ら、前記のtanδより予測した期待値ほどの吸音効果が
達成されず、目的とした防音性能が得られない場合が多
々発生する問題点があった。2. Description of the Related Art Hitherto, as a soundproofing material, a foam or a fiber composite formed of a material having a high value based on tan δ which is an index indicating internal loss has been known. However, there is a problem that the sound absorption effect as expected as predicted from the above-mentioned tan δ is not achieved, and the desired soundproof performance cannot be obtained in many cases.
【0003】[0003]
【発明の技術的課題】本発明は、吸音効果に優れて高い
防音効果を発揮する防音材の開発を課題とする。SUMMARY OF THE INVENTION An object of the present invention is to develop a soundproofing material which is excellent in sound absorbing effect and exhibits high soundproofing effect.
【0004】[0004]
【課題の解決手段】本発明は、ポアソン比が0.3以下
の多孔質部材からなることを特徴とする防音材を提供す
るものである。SUMMARY OF THE INVENTION The present invention provides a soundproofing material comprising a porous member having a Poisson's ratio of 0.3 or less.
【0005】[0005]
【発明の効果】多孔質部材からなる防音材の防音作用
は、空気の振動からなる音エネルギーを防音材通過の際
に内部空気の粘性摩擦抵抗により熱エネルギーに変換し
て消費することや、音エネルギーを防音材が吸収してそ
れ自身が振動しそれにより音エネルギーを熱エネルギー
に変換して消費する機構が主なものであり、本発明にて
は上記のポアソン比に基づいて防音材自身の振動性に優
れて音エネルギーを効率よく吸収し、優れた防音効果を
発揮する。The soundproofing effect of the soundproofing material made of a porous member is achieved by converting sound energy consisting of air vibration into heat energy by viscous frictional resistance of internal air when passing through the soundproofing material, The main mechanism is a mechanism in which the soundproofing material absorbs energy and vibrates itself, thereby converting sound energy into heat energy and consuming it.In the present invention, the soundproofing material itself is based on the above Poisson's ratio. It excels in vibration and absorbs sound energy efficiently, and exhibits an excellent soundproofing effect.
【0006】前記は、従来のtanδに基づく防音材の設
計では要求特性が不充分であることを究明したことに基
づく。すなわち、tanδに基づく材料設定にて音エネル
ギーを振動エネルギーとして吸収消費する内部損失は高
めうるが、それには音エネルギーの吸収による防音材の
振動が前提される。従って内部損失の高い材料を用いて
も、防音材としての振動性に劣る場合には、防音効果が
発揮されにくい。The above is based on the finding that the required characteristics are not sufficient in the conventional design of a soundproofing material based on tan δ. In other words, the internal loss of absorbing and consuming sound energy as vibration energy can be increased by setting the material based on tan δ, but this is premised on vibration of the soundproofing material due to absorption of sound energy. Therefore, even if a material having a high internal loss is used, the soundproofing effect is difficult to be exerted when the soundproofing material has poor vibration properties.
【0007】本発明は、体積としての変形の容易性の指
標であるポアソン比に基づき、それを小さい数値に条件
付けして防音材が全体として振動しやすいものとし、そ
れにより前記した音エネルギーの吸収による防音材の振
動を保証し、防音効果の効率的な発現を達成したもので
ある。The present invention is based on the Poisson's ratio, which is an index of the easiness of deformation as a volume, and conditions it to a small numerical value to make the soundproofing material easy to vibrate as a whole. As a result, the vibration of the soundproofing material is guaranteed, and the efficient soundproofing effect is achieved.
【0008】[0008]
【発明の実施形態】本発明の防音材は、ポアソン比が
0.3以下の多孔質部材からなる。BEST MODE FOR CARRYING OUT THE INVENTION The soundproofing material of the present invention comprises a porous member having a Poisson's ratio of 0.3 or less.
【0009】用いる多孔質部材は、0.3以下のポアソ
ン比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、NBR系やそれらのブ
レンド系の如き各種ポリマー等からなる発泡体、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
なる繊維集成体などの適宜なものを用いうる。[0009] The porous member used may be one having a Poisson's ratio of 0.3 or less. Accordingly, as the porous member, for example, foams made of various polymers such as olefin-based, urethane-based, acrylic-based, vinyl chloride-based, SBR-based, NR-based, NBR-based and blends thereof, natural and synthetic organic and Any suitable fiber aggregate, such as a non-woven fabric formed of suitable inorganic fibers, may be used.
【0010】よって、従来の防音材を形成する多孔質部
材の製造に使用のいずれの材料も用いることができる。
好ましい多孔質部材は、防音材の使用目的に応じたtan
δに基づいて内部損失の高い材料にて形成したものであ
る。なお防音材は、適宜な層形態を有するものであって
よく、例えば2種以上の多孔質部材の積層体や混合物な
いし複合物などとして形成されていてもよい。Therefore, any of the materials used for manufacturing a conventional porous member for forming a soundproofing material can be used.
A preferred porous member is a tan according to the intended use of the soundproofing material.
It is formed of a material having a high internal loss based on δ. The soundproofing material may have an appropriate layer form, and may be formed, for example, as a laminate, a mixture, or a composite of two or more types of porous members.
【0011】発泡体は、独立気泡構造又は連続気泡構
造、あるいはそれらが混在した気泡構造などの適宜な気
泡構造を有するものであってよい。好ましく用いうる発
泡体は、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、イソプレンゴ
ム等の適宜なゴム系ポリマー、就中EPDMやそれを併
用したゴム系ポリマーなどからなるものである。The foam may have an appropriate cell structure such as a closed cell structure, an open cell structure, or a cell structure in which these are mixed. Foams that can be preferably used include those made of appropriate thermoplastic resins such as polyurethane, polyethylene, and polyvinyl chloride, and appropriate rubber-based polymers such as butyl rubber and isoprene rubber, particularly EPDM and rubber-based polymers using them in combination. It is.
【0012】前記EPDM系発泡体の具体例としては、
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ML1+2(100
℃)が30〜110のものなどからなるEPDMを成分
とするものがあげられる。Specific examples of the EPDM foam include:
Copolymers containing as components ethylene-, olefins such as propylene and butene-1, and cyclic or non-cyclic polyenes having a non-conjugated double bond such as dicyclopentadiene or ethylidene norbornene, preferably 45 to 70 moles of ethylene %, Α-olefin 5-20 mol%, polyene 50-
10 mol%, especially Mooney viscosity ML 1 + 2 (100
(C) of 30 to 110, and EPDM as a component.
【0013】また前記のEPDMを併用したゴム系発泡
体における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。As the rubber component other than EPDM in the rubber foam using EPDM in combination, suitable rubber components such as natural rubber, butyl rubber, chloroprene rubber, acrylic rubber, styrene / butadiene rubber and nitrile / butadiene rubber can be used. 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.
【0014】上記した連続気泡構造の発泡体は、例えば
ポリマー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製造する
ことができる。The above-mentioned foam having an open-cell structure is obtained by, for example, forming a mixture of a polymer component and an appropriate additive such as a foaming agent or a vulcanizing agent into a sheet or the like and subjecting it to foam vulcanization treatment.
The cell can be manufactured by a method of subjecting a part or all of the cell to physical property adjustment processing such as foam breaking by an appropriate means such as compression processing.
【0015】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150重量部以
下、就中100重量部以下、特に5〜50重量部が好ま
しい。Examples of the foaming agent include azo-based compounds such as azodicarbonamide, dinitrosopentamethylenetetramine, sodium hydrogencarbonate and 4,4'-oxybis (benzenesulfonylsemicarbazide), N-nitroso-based compounds, inorganic compounds and semicarbazides. And hydrazine-based and triazole-based ones. The amount of the foaming agent to be used is preferably 150 parts by weight or less, more preferably 100 parts by weight or less, particularly preferably 5 to 50 parts by weight, per 100 parts by weight of the rubber component, in view of the expansion ratio for obtaining the desired physical properties.
【0016】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.
【0017】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, suitable foaming aids such as urea-based, salicylic-acid-based and benzoic acid-based, aldehyde ammonia-based, aldehydeamine-based, thiourea-based and guanidine-based, thiazole-based and sulfenamide-based compounds can be used. A suitable vulcanization aid such as a thiuram-based, dithiocarbamate-based, or xanthate-based can be used as necessary.
【0018】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、カーボ
ンブラック等の補強剤、ステアリン酸等の滑剤、亜鉛華
等の安定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。Also, 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 system, an aroma system or an asphalt system, a reinforcing agent such as carbon black, a lubricant such as stearic acid, and a stabilizer such as zinc white can also be added as needed in the preparation of the admixture. .
【0019】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 from the viewpoint 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.
【0020】上記ポアソン比の達成性などの点より発泡
体としては、例えば剥離ライナ上に混和物を0.5〜5
0mmの厚さで展開し、それを100〜200℃の温度で
10〜60分間加熱処理するなどして、発泡倍率50倍
以下、就中5〜40倍、特に8〜30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。多孔質部材
は、連泡系の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たものなど
であってもよい。From the viewpoint of attainment of the above Poisson's ratio, as a foam, for example, 0.5 to 5
It is developed at a thickness of 0 mm and heat-treated at a temperature of 100 to 200 ° C. for 10 to 60 minutes so that the expansion ratio becomes 50 times or less, particularly 5 to 40 times, particularly 8 to 30 times. Those subjected to foam vulcanization can be preferably used. The porous member may be one obtained by impregnating an open-cell foam with an appropriate resin such as an acrylic resin, a polybutyral resin, or a polyester resin.
【0021】一方、繊維集成体としては、グラスウール
やロックウール、各種合成繊維の如き天然や合成の有機
や無機の適宜な繊維を樹脂接着や熱接着、ニードルパン
チやスパンレース、スパンボンドやステッチボンド、パ
ウダー接着や溶剤接着等の適宜な方式で不織布状等に集
成してなるものなどが好ましく用いうる。上記した発泡
体形成用の組成物を押出しメルトブロー方式などにて不
織布状等に堆積集成してなる繊維集成体なども好ましく
用いうる。繊維集成体は、繊維を部分的に接着したもの
や架橋したものなどであってもよい。On the other hand, as a fiber assembly, suitable natural or synthetic organic or inorganic fibers such as glass wool, rock wool, and various synthetic fibers are resin-bonded or heat-bonded, needle-punched or spun-lace, spun-bonded or stitch-bonded. And those formed into a nonwoven fabric or the like by an appropriate method such as powder adhesion or solvent adhesion can be preferably used. A fiber assembly formed by extruding the above-described composition for forming a foam into a non-woven fabric or the like by extrusion melt blowing or the like can also be preferably used. The fiber assembly may be one in which fibers are partially adhered or cross-linked.
【0022】なお多孔質部材におけるポアソン比の調節
は、例えば発泡体では上記した如く形成ポリマーの種類
や発泡倍率などを制御することにより、また繊維集成体
では用いる繊維の種類や集成状態などを制御することに
より行うことができる。The Poisson's ratio of the porous member is adjusted, for example, by controlling the type of the formed polymer and the expansion ratio as described above in the case of the foam, and by controlling the type and the state of the fibers used in the fiber assembly. Can be performed.
【0023】防音材の形態は、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。なお防音
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 soundproofing material can be appropriately determined according to the purpose of use, such as the place of application, and the thickness thereof is also arbitrary. Generally, based on the apparent thickness, no more than 100 mm, especially 0.1 mm.
The thickness is 5 to 70 mm, especially 1 to 40 mm. Note that the soundproofing material does not need to have a uniform thickness, and may have partially different thicknesses.
【0024】肉厚が部分的に異なる防音材は、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。A soundproofing material having a partially different wall thickness is obtained by filling a chip formed by, for example, crushing a porous member into flakes into a predetermined mold by applying an adhesive to the surface thereof. It can be formed efficiently by a method such as compression molding.
【0025】本発明による防音材は、例えば自動車や建
築物、住設機器や電気・電子機器などの従来に準じた適
宜な箇所の防音処理に用いることができる。その場合、
例えば所定の形態に予め形成して各種の部材間に介在配
置する方式や、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目的の部材に
取付ける方式などの従来に準じた適宜な方式により防音
処理を施すことができる。The soundproofing material according to the present invention can be used for soundproofing of an appropriate place according to the prior art, such as an automobile, a building, a dwelling equipment and an electric / electronic equipment. In that case,
For example, a method of forming in a predetermined form in advance and interposing between various members, or a method of attaching a tape-shaped or sheet-shaped material to a target member by an appropriate method such as a winding method or a sticking method, etc. The soundproofing process can be performed by an appropriate method according to the related art.
【0026】[0026]
【実施例】実施例1 EPゴム系ポリマー(三井石油化学社製、EPT402
1、以下同じ)100部(重量部、以下同じ)、重質炭
酸カルシウム120部、アスファルト系軟化剤100
部、カーボンブラック15部、亜鉛華5部、ステアリン
酸1部、発泡剤(永和化成工業社製、ビニフォールAC
#LQ、以下同じ)25部、硫黄1.5部及び加硫促進
剤(大内新興化学社製、ノクセラーEZ、以下同じ)4
部を加圧ニーダで混練し、それを押出し機にて厚さ10
mmのシートに成形し、160℃のオーブン中で30分間
加熱して発泡加硫し、発泡倍率が9倍でポアソン比が
0.25の発泡体からなる防音材を得た。EXAMPLES Example 1 EP rubber polymer (EPT402 manufactured by Mitsui Petrochemical Co., Ltd.)
1, the same applies hereinafter) 100 parts (parts by weight, the same applies hereinafter), heavy calcium carbonate 120 parts, asphalt softener 100
Parts, carbon black 15 parts, zinc white 5 parts, stearic acid 1 part, foaming agent (Vinifol AC, manufactured by Eiwa Chemical Industry Co., Ltd.)
#LQ, the same applies hereinafter) 25 parts, sulfur 1.5 parts and vulcanization accelerator (Nouchira EZ, manufactured by Ouchi Shinko Chemical Co., Ltd .; the same applies hereinafter) 4
Part was kneaded with a pressure kneader, and it was extruded to a thickness of 10
The resulting sheet was molded into a sheet having a thickness of 0.1 mm, heated in an oven at 160 ° C. for 30 minutes, and foamed and vulcanized to obtain a soundproofing material made of a foam having a foaming ratio of 9 and a Poisson's ratio of 0.25.
【0027】実施例2 EPゴム系ポリマー70部、低密度ポリエチレン(三井
石油化学社製、ミソラン)30部、重質炭酸カルシウム
20部、アスファルト系軟化剤20部、カーボンブラッ
ク10部、亜鉛華5部、ステアリン酸1部、発泡剤30
部、硫黄1.5部及び加硫促進剤3部を加圧ニーダで混
練し、それを押出し機にて厚さ10mmのシートに成形
し、160℃のオーブン中で30分間加熱して発泡加硫
し、発泡倍率が25倍でポアソン比が0.21の発泡体
からなる防音材を得た。Example 2 70 parts of EP rubber-based polymer, 30 parts of low density polyethylene (Misolan, manufactured by Mitsui Petrochemical Co., Ltd.), 20 parts of heavy calcium carbonate, 20 parts of asphalt-based softener, 10 parts of carbon black, and 5 parts of zinc white Part, stearic acid 1 part, foaming agent 30
Parts, 1.5 parts of sulfur and 3 parts of a vulcanization accelerator are kneaded with a pressure kneader, formed into a sheet having a thickness of 10 mm by an extruder, and heated in an oven at 160 ° C. for 30 minutes to foam. By vulcanizing, a soundproofing material consisting of a foam having a foaming ratio of 25 and a Poisson's ratio of 0.21 was obtained.
【0028】実施例3 ゴム系ポリマー(クラレ社製、クレイトンG1657)
100部、樹脂(安原化学社製、クリアロンP−12
5)50部、老化防止剤(チバガイギー社製、イルガノ
ックスB612)2部をミキシングロールで混練し、そ
れを押出し式メルトブロー装置にてヘッド温度230
℃、ホットエア温度260℃の条件で繊維状に成形しつ
つ不織布状に堆積させて目付量0.25g/cm2、ポア
ソン比0.09の繊維集成体からなる防音材を得た。Example 3 Rubber-based polymer (Kuraray Co., Ltd., Kraton G1657)
100 parts, resin (Clearon P-12, manufactured by Yasuhara Chemical Co., Ltd.)
5) 50 parts and 2 parts of an anti-aging agent (Irganox B612, manufactured by Ciba Geigy) are kneaded with a mixing roll, and the mixture is extruded at a head temperature of 230 with a melt blow apparatus.
° C., basis weight 0.25 g / cm 2 was deposited nonwoven fabric while molding the fibrous under the conditions of hot air temperature 260 ° C., to obtain a soundproofing material consisting of fiber assembly of Poisson's ratio 0.09.
【0029】比較例 アスファルト系軟化剤の配合量を80部とし、発泡剤の
配合量を15部とし、かつ加硫促進剤の配合量を5部と
したほかは実施例1に準じて発泡倍率が3倍でポアソン
比が0.40の発泡体からなる防音材を得た。Comparative Example The expansion ratio was the same as in Example 1 except that the blending amount of the asphalt softening agent was 80 parts, the blending amount of the blowing agent was 15 parts, and the blending amount of the vulcanization accelerator was 5 parts. Was obtained, and a soundproofing material comprising a foam having a Poisson's ratio of 0.40 was obtained.
【0030】評価試験 吸音率 実施例、比較例で得た防音材の吸音率をJIS A 1
405に準拠した垂直入射吸音率測定装置により測定し
た。その1kHz、2kHz、4kHzについての結果
を次表に示した。Evaluation Test Sound Absorption Coefficient The sound absorption coefficient of the soundproofing materials obtained in Examples and Comparative Examples was measured according to JIS A1.
405 was measured by a vertical incidence sound absorption coefficient measuring device. The results for 1 kHz, 2 kHz and 4 kHz are shown in the following table.
【0031】 [0031]
Claims (1)
らなることを特徴とする防音材。1. A soundproofing material comprising a porous member having a Poisson's ratio of 0.3 or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11619298A JPH11293019A (en) | 1998-04-09 | 1998-04-09 | Soundproof material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11619298A JPH11293019A (en) | 1998-04-09 | 1998-04-09 | Soundproof material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11293019A true JPH11293019A (en) | 1999-10-26 |
Family
ID=14681122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11619298A Pending JPH11293019A (en) | 1998-04-09 | 1998-04-09 | Soundproof material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11293019A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107513267A (en) * | 2017-07-31 | 2017-12-26 | 吉林大学 | A kind of ethylene propylene diene rubber polyurethane composite acoustic packaging material and preparation method thereof |
JP2020533458A (en) * | 2017-09-13 | 2020-11-19 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | Authentic polyurethane and melamine foam by triaxial compression |
-
1998
- 1998-04-09 JP JP11619298A patent/JPH11293019A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107513267A (en) * | 2017-07-31 | 2017-12-26 | 吉林大学 | A kind of ethylene propylene diene rubber polyurethane composite acoustic packaging material and preparation method thereof |
JP2020533458A (en) * | 2017-09-13 | 2020-11-19 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | Authentic polyurethane and melamine foam by triaxial compression |
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