JP2005350533A - Acoustical material and method for preparation of the same - Google Patents

Acoustical material and method for preparation of the same Download PDF

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JP2005350533A
JP2005350533A JP2004171112A JP2004171112A JP2005350533A JP 2005350533 A JP2005350533 A JP 2005350533A JP 2004171112 A JP2004171112 A JP 2004171112A JP 2004171112 A JP2004171112 A JP 2004171112A JP 2005350533 A JP2005350533 A JP 2005350533A
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mold
sound
skin layer
release agent
sound insulation
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Naoyuki Hatano
直之 畑野
Koji Maeda
孝司 前田
Yoshihiro Noguchi
好洋 野口
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Honda Motor Co Ltd
Asahi Rubber Inc
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Honda Motor Co Ltd
Asahi Rubber Inc
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<P>PROBLEM TO BE SOLVED: To provide a lightweighted acoustical material and a method for producing the same. <P>SOLUTION: The invention relates to the acoustical material 1 having a high sound insulating region (skin layer 10) with ≥10,000 Ns/m<SP>3</SP>of air-flow resistance and a low sound insulating region with 1,000-8,000 Ns/m<SP>3</SP>of air-flow resistance on the surface a polyurethane foam 1a. The invention relates to the method for preparation of the acoustical material comprising foam molding by reaction of a polyol type compound and an isocyanate compound in a mold in the presence of a foaming agent, wherein a solvent type releasing agent is previously coated on the inner surface of a metal mold and then coating a water-soluble releasing agent on a part of the inner surface of the metal mold. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、車両などに設けられるポリウレタン製防音材およびその製造方法に関する。   The present invention relates to a polyurethane soundproofing material provided in a vehicle or the like and a method for manufacturing the same.

自動車等の車両においては、エンジンなどの騒音を発生する装置を有しており、この装置から発生する音がキャビン内に伝わることを防止するため、従来から、ポリウレタンフォームを有する防音材が自動車車体等の鋼板パネルに設けられている。その防音材としては、例えば、特許文献１に、高比重の合成樹脂または合成ゴムなどからなる遮音シートとポリウレタンフォームからなる吸音材とを組み合わせたものが記載されている。この防音材では、遮音シートにて遮音性を確保し、吸音材にて吸音性を確保して、全体として防音性に優れたものになっている。
特許第２６５９５７２号公報 A vehicle such as an automobile has a device for generating noise such as an engine, and in order to prevent the sound generated from this device from being transmitted into the cabin, conventionally, a soundproof material having a polyurethane foam has been used as a vehicle body. Etc. are provided on a steel plate panel. As the soundproofing material, for example, Patent Document 1 describes a combination of a sound insulating sheet made of high specific gravity synthetic resin or synthetic rubber and a sound absorbing material made of polyurethane foam. In this soundproofing material, sound insulation is ensured by the sound insulation sheet, and sound absorption is secured by the sound absorbing material, so that the soundproofing property as a whole is excellent.
Japanese Patent No. 2659572

しかしながら、遮音シートを有する防音材においては、遮音シートが高比重であるために重く、その結果、この防音材を設けた場合には車両の軽量化を阻害した。また、軽量化するために遮音シートを取り除いたポリウレタンフォームを吸音材として用いた場合には、遮音性に劣るため防音材としての機能を充分に発揮しなかった。
本発明は、前記事情を鑑みてなされたものであり、軽量化された防音材およびその製造方法を提供することを目的とする。 However, the sound insulating material having the sound insulating sheet is heavy because the sound insulating sheet has a high specific gravity, and as a result, when the sound insulating material is provided, the weight reduction of the vehicle is hindered. Moreover, when the polyurethane foam from which the sound insulation sheet was removed for weight reduction was used as the sound absorbing material, the function as the sound insulating material was not sufficiently exhibited because of poor sound insulation.
This invention is made | formed in view of the said situation, and aims at providing the soundproof material reduced in weight and its manufacturing method.

本発明の防音材は、ポリウレタンフォームの表面に、通気抵抗が１００００Ｎｓ／ｍ３以上の高遮音性領域と、通気抵抗が１０００〜８０００Ｎｓ／ｍ３の低遮音性領域とを有することを特徴とする。
本発明の防音材においては、高遮音性領域がポリウレタンのスキン層であることが好ましい。
本発明の防音材の製造方法は、発泡剤存在下、ポリオール化合物とイソシアネート化合物とを金型内で反応させて発泡成形する防音材の製造方法において、
金型内表面にあらかじめ溶剤型離型剤を塗布し、その後、金型内表面の一部に水溶性離型剤を塗布することを特徴とする。
本発明の防音材の製造方法においては、発泡成形の際に、溶剤型離型剤を塗布した部分の金型温度を４０〜７０℃にし、水溶性離型剤を塗布した部分の金型温度を２０〜５０℃にすることが好ましい。 The soundproofing material of the present invention is characterized in that the surface of the polyurethane foam has a high sound insulation region having a ventilation resistance of 10,000 Ns / m 3 or more and a low sound insulation region having a ventilation resistance of 1000 to 8000 Ns / m 3. .
In the soundproofing material of the present invention, the high sound insulation region is preferably a polyurethane skin layer.
The method for producing a soundproofing material according to the present invention is a method for producing a soundproofing material which is foam-molded by reacting a polyol compound and an isocyanate compound in a mold in the presence of a foaming agent.
A solvent mold release agent is applied in advance to the inner surface of the mold, and then a water-soluble release agent is applied to a part of the inner surface of the mold.
In the method for producing a soundproofing material of the present invention, at the time of foam molding, the mold temperature of the part to which the solvent-type release agent is applied is set to 40 to 70 ° C., and the mold temperature of the part to which the water-soluble release agent is applied. Is preferably set to 20 to 50 ° C.

本発明の防音材は、遮音シートを有していないにもかかわらず遮音性が高く、防音性に優れる。しかも、遮音シートを有していないため軽量化されている。したがって、本発明の防音材が設けられた車両は軽量化できる。
本発明の防音材の製造方法によれば、遮音性の高いスキン層を部分的に容易に形成できる。 The soundproofing material of the present invention has high soundproofing properties and excellent soundproofing properties despite having no soundproofing sheet. And since it does not have a sound-insulation sheet | seat, it is reduced in weight. Therefore, the vehicle provided with the soundproofing material of the present invention can be reduced in weight.
According to the method for producing a soundproof material of the present invention, a skin layer having high sound insulation can be partially easily formed.

本発明の防音材の一実施形態例について説明する。
図１および図２に、本実施形態例の防音材を示す。本実施形態例の防音材１は、シート状のポリウレタンフォーム１ａの一方の表面の一部に矩形状のスキン層１０を有するものである。
ここで、スキン層１０は、連通性の低い気泡が形成されたポリウレタンの層であり、通気抵抗が１００００Ｎｓ／ｍ３以上の層である。すなわち、スキン層１０は高遮音性領域である。 An embodiment of the soundproofing material of the present invention will be described.
1 and 2 show a soundproofing material according to this embodiment. The soundproofing material 1 of this embodiment has a rectangular skin layer 10 on a part of one surface of a sheet-like polyurethane foam 1a.
Here, the skin layer 10 is a polyurethane layer in which bubbles having low communication properties are formed, and is a layer having a ventilation resistance of 10,000 Ns / m 3 or more. That is, the skin layer 10 is a high sound insulation region.

また、ポリウレタンフォーム１ａの表面には、通気抵抗が１０００〜８０００Ｎｓ／ｍ３の低遮音性領域２０を有している。この低遮音性領域２０は、気泡の連通性が高いので、遮音性が低いものの、吸音性が高い。これに対し、低遮音性領域２０の通気抵抗が１０００Ｎｓ／ｍ３未満では気泡が過剰に連通することになるので、防音材１の機械的強度を確保できない。また、８０００Ｎｓ／ｍ３を超えると気泡の連通性が低く吸音性を確保できない。
ここで、通気抵抗の測定は、サンプルに空気を一定流速で透過させた際のサンプル両側の圧力差を測定することで求められる。 Moreover, the surface of the polyurethane foam 1a has a low sound insulation region 20 having a ventilation resistance of 1000 to 8000 Ns / m 3 . The low sound insulation region 20 has high air-absorbing properties, and thus has low sound insulation properties but high sound absorption properties. On the other hand, if the airflow resistance of the low sound insulation region 20 is less than 1000 Ns / m 3 , the air bubbles communicate excessively, so that the mechanical strength of the soundproof material 1 cannot be ensured. On the other hand, if it exceeds 8000 Ns / m 3 , the connectivity of the bubbles is so low that sound absorption cannot be secured.
Here, the measurement of the ventilation resistance is obtained by measuring the pressure difference between both sides of the sample when air is permeated through the sample at a constant flow rate.

低遮音性領域２０においては、ヤング率が１．５×１０５〜３．５×１０５Ｎ／ｍ２であることが好ましい。ヤング率が１．５×１０５Ｎ／ｍ２未満であると柔軟すぎて取り扱いにくく、ヤング率が３．５×１０５Ｎ／ｍ２を超えると剛直であり、防音性が損なわれる。
また、低遮音性領域２０は、密度が６０〜１３０ｋｇ／ｍ３であることが好ましい。密度が６０ｋｇ／ｍ３未満であると機械的強度が低下し、１３０ｋｇ／ｍ３を超えると吸音性が損なわれる。 In the low sound insulation region 20, the Young's modulus is preferably 1.5 × 10 5 to 3.5 × 10 5 N / m 2 . If the Young's modulus is less than 1.5 × 10 5 N / m 2, it is too soft and difficult to handle, and if the Young's modulus exceeds 3.5 × 10 5 N / m 2 , it is rigid and the soundproofing property is impaired.
The low sound insulation region 20 preferably has a density of 60 to 130 kg / m 3 . If the density is less than 60 kg / m 3 , the mechanical strength is lowered, and if it exceeds 130 kg / m 3 , the sound absorption is impaired.

防音材１の厚さは５ｍｍ以上であることが好ましい。防音材１の厚さが５ｍｍ以上であれば、防音性がより高くなる上に、防音材としての形状を確実に確保できる。ただし、厚さが２０ｍｍを超えると大きくなりすぎるので好ましくない。
また、スキン層１０の厚さは３０〜２００μｍであることが好ましい。スキン層１０の厚さが３０μｍ未満であると充分な遮音性を発揮しないことがあり、２００μｍを超えても遮音性が厚さに応じて高くなることはないので製造が不利になるだけである。 The thickness of the soundproofing material 1 is preferably 5 mm or more. If the thickness of the soundproofing material 1 is 5 mm or more, the soundproofing property is further improved and the shape as the soundproofing material can be reliably ensured. However, if the thickness exceeds 20 mm, it becomes too large, which is not preferable.
Moreover, it is preferable that the thickness of the skin layer 10 is 30-200 micrometers. If the thickness of the skin layer 10 is less than 30 μm, sufficient sound insulation may not be exhibited, and even if it exceeds 200 μm, the sound insulation does not increase according to the thickness, which is only disadvantageous in production. .

防音材１は、例えば、図２に示すように、自動車車体の鋼板パネル３０（例えば、厚さ０．８ｍｍ）に、スキン層１０がキャビン側に位置するように設けられる。また、図示例のように、キャビン側に補機類（エアコンユニット等）４０が設けられる場合には、防音材１に厚さが薄い部分（以下、防音材薄肉部１ｂという）をあらかじめ形成し、その防音材薄肉部１ａの表面にスキン層１０を設けておくことが好ましい。そして、防音材薄肉部１ｂ内に補機類が挿入されるように防音材１を配置する。
防音材薄肉部１ｂでは吸音性が低くなるが、防音材薄肉部１ｂの表面には高遮音性領域であるスキン層１０が設けられており、その部分の遮音性が高められている。そのため、鋼板パネル３０を通して防音材に音が入射した場合、入射した音の一部は、吸音性に優れる低遮音性領域２０にて吸音され、残りの一部はスキン層１０により反射される。反射された音は再び低遮音性領域２０を通って吸音されることになる。
したがって、この防音材１は防音性が高く、エンジンなどで発生する騒音がキャビン内に伝わることを防止できる。しかも、この防音材１はポリウレタンからなっており、高比重の遮音シートを用いていないから軽量である。 For example, as shown in FIG. 2, the soundproofing material 1 is provided on a steel plate panel 30 (for example, a thickness of 0.8 mm) of an automobile body so that the skin layer 10 is located on the cabin side. Further, as shown in the illustrated example, when the auxiliary equipment (air conditioner unit or the like) 40 is provided on the cabin side, a thin portion (hereinafter referred to as the soundproof material thin portion 1b) is formed in the soundproof material 1 in advance. It is preferable to provide the skin layer 10 on the surface of the soundproof material thin portion 1a. And the soundproof material 1 is arrange | positioned so that auxiliary machinery may be inserted in the soundproof material thin part 1b.
Although the sound absorbing property is low in the sound insulating material thin portion 1b, the skin layer 10 which is a high sound insulating region is provided on the surface of the sound insulating material thin portion 1b, and the sound insulating property of the portion is enhanced. Therefore, when sound is incident on the soundproof material through the steel plate panel 30, a part of the incident sound is absorbed in the low sound insulation region 20 having excellent sound absorption, and the remaining part is reflected by the skin layer 10. The reflected sound is again absorbed through the low sound insulation region 20.
Therefore, the soundproofing material 1 has high soundproofing properties and can prevent noise generated in the engine or the like from being transmitted into the cabin. Moreover, the soundproofing material 1 is made of polyurethane and is lightweight because it does not use a sound insulating sheet having a high specific gravity.

この防音材においては、遮音性が求められる部分にスキン層を配置すればよいので、防音材薄肉部１ｂ以外にも、例えば、エンジンなどの騒音源の近傍にスキン層を配置することもできる。   In this soundproof material, a skin layer may be disposed in a portion where sound insulation is required, and therefore, in addition to the soundproof material thin portion 1b, for example, a skin layer can be disposed in the vicinity of a noise source such as an engine.

なお、本実施形態例では、ポリウレタンフォーム表面の一部に高遮音性領域であるスキン層を形成したが、ポリウレタンフォーム表面の全面にスキン層を形成して遮音性を全体的に高くすることも考えられる。しかしながら、全面にスキン層を形成してしまうと吸音性が全体的に損なわれ、総合的に見て防音性が低くなるから本発明の課題を解決できない。   In this embodiment, a skin layer that is a highly sound-insulating region is formed on a part of the polyurethane foam surface. However, a skin layer may be formed on the entire surface of the polyurethane foam to increase the overall sound insulation. Conceivable. However, if the skin layer is formed on the entire surface, the sound absorbing property is totally impaired, and the soundproofing property is lowered as a whole, so that the problem of the present invention cannot be solved.

次に、防音材の製造方法の一実施形態例について説明する。
まず、金型をあらかじめ加熱しておき、スキン層を設ける部分の金型温度を２０〜５０℃に調節し、スキン層を設けない部分の金型温度を４０〜７０℃に調節する。このように、一つの金型内で金型温度が異なる領域を形成する場合には、それぞれの領域毎に温度を調節できるようにしておけばよい。
なお、スキン層を設ける部分の金型温度が２０℃未満の場合には充分に発泡成形できないことがあり、５０℃を超えると気泡の連通性が高くなってスキン層を形成できないことがある。また、スキン層を設けない部分の金型温度が４０℃未満では気泡の連通性が不充分になることがあり、７０℃を超えるとウレタン反応の反応性が高くなりすぎてポリウレタンフォームの機械的強度が低下する場合がある。 Next, an embodiment of a method for producing a soundproof material will be described.
First, the mold is heated in advance, the mold temperature of the portion where the skin layer is provided is adjusted to 20 to 50 ° C., and the mold temperature of the portion where the skin layer is not provided is adjusted to 40 to 70 ° C. As described above, when regions having different mold temperatures are formed in one mold, the temperature may be adjusted for each region.
In addition, when the mold temperature of the portion where the skin layer is provided is less than 20 ° C., foam molding may not be performed sufficiently, and when it exceeds 50 ° C., the connectivity of bubbles may be increased and the skin layer may not be formed. In addition, if the mold temperature of the part where the skin layer is not provided is less than 40 ° C., the bubble communication may be insufficient, and if it exceeds 70 ° C., the reactivity of the urethane reaction becomes too high and the polyurethane foam mechanically The strength may decrease.

次いで、金型内表面の全面に溶剤型離型剤を塗布し、その後、その上から、スキン層を設ける部分に水溶性離型剤を塗布する。各離型剤の塗布方法としては、作業性の点からスプレー塗布が好ましい。
水溶性離型剤としては、例えば、ポリエチレン系離型剤、シリコン系離型剤、フッ素樹脂系離型剤、または、ポリエチレン、シリコン、フッ素樹脂に他の成分が共重合した共重合体を含む離型剤等が挙げられる。
溶剤型離型剤としては、例えば、ワックス系離型剤、シリコン系離型剤、フッ素樹脂系離型剤、または、ワックス、シリコン、フッ素樹脂に他の成分が共重合した共重合体を含む離型剤、界面活性剤系離型剤等が挙げられる。 Next, a solvent-type release agent is applied to the entire surface of the inner surface of the mold, and then a water-soluble release agent is applied to a portion on which the skin layer is provided. As a method for applying each release agent, spray coating is preferable from the viewpoint of workability.
Examples of the water-soluble release agent include a polyethylene release agent, a silicon release agent, a fluororesin release agent, or a copolymer obtained by copolymerizing polyethylene, silicon, and a fluororesin with other components. Examples include mold release agents.
Examples of the solvent-type mold release agent include a wax-type mold release agent, a silicon-type mold release agent, a fluororesin-type mold release agent, or a copolymer in which other components are copolymerized with wax, silicon, and fluororesin. Examples include release agents and surfactant release agents.

そして、金型に設けられた注入口からポリオール化合物とイソシアネート化合物と触媒と発泡剤とを注入し、触媒および発泡剤の存在下でポリオール化合物とイソシアネート化合物とを反応させることで発泡成形してポリウレタンからなる防音材を製造する。   Then, a polyol compound, an isocyanate compound, a catalyst, and a foaming agent are injected from an injection port provided in the mold, and the polyol compound and the isocyanate compound are reacted in the presence of the catalyst and the foaming agent to perform foam molding to form polyurethane. A soundproofing material made of

ポリウレタンフォームの原料であるポリオール化合物としては、例えば、ポリプロピレングリコール、ポリテトラメチレングリコール、これらの誘導体などのポリエーテルポリオール、縮合系ポリエステルポリオール、ラクトン系ポリエステルポリオール、ポリカーボネートポリオールなどのポリエステルポリオール等が挙げられる。   Examples of the polyol compound that is a raw material of the polyurethane foam include polyether polyols such as polypropylene glycol, polytetramethylene glycol, and derivatives thereof, polyester polyols such as condensed polyester polyols, lactone polyester polyols, and polycarbonate polyols. .

イソシアネート化合物としては、例えば、トリレンジイソシアネート（ＴＤＩ）、ジフェニルメタンジイソシアネート（ＭＤＩ）、ポリメチレンポリフェニルポリイソシアネート（ポリメリックＭＤＩ）、トリジンジイソシアネート（ＴＯＤＩ）、ナフタリンジイソシアネート（ＮＤＩ）、ヘキサメチレンジイソシアネート（ＨＭＤＩ）、イソホロンジイソシアネート（ＩＰＤＩ）、キシリレンジイソシアネート（ＸＤＩ）等のポリイソシアネートが挙げられる。   Examples of the isocyanate compound include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl polyisocyanate (polymeric MDI), tolidine diisocyanate (TODI), naphthalene diisocyanate (NDI), hexamethylene diisocyanate (HMDI), Examples thereof include polyisocyanates such as isophorone diisocyanate (IPDI) and xylylene diisocyanate (XDI).

触媒としては、例えば、トリエチルアミンなどのトリアルキルアミン、Ｎ，Ｎ，Ｎ’，Ｎ’−テトラメチル−１，３−ブタンジアミンなどのテトラアルキルジアミン、ジブチル錫ジラウレート、ジブチル錫ジ（２−エチルヘキソエート）などの有機錫化合物等が挙げられる。
発泡剤としては、主として水が用いられる。 Examples of the catalyst include trialkylamines such as triethylamine, tetraalkyldiamines such as N, N, N ′, N′-tetramethyl-1,3-butanediamine, dibutyltin dilaurate, dibutyltin di (2-ethylhexene). Organotin compounds such as xoate).
As the foaming agent, water is mainly used.

以上のように、金型温度を２０〜５０℃にし、その温度の金型部分に水溶性離型剤を塗布することで、気泡の連通を抑制させて、ポリウレタンフォームの表面に通気抵抗が１００００Ｎｓ／ｍ３以上の高遮音性領域であるスキン層を設けることができる。また、金型温度を４０〜７０℃にし、その温度の金型部分に溶剤型離型剤を塗布することで、気泡の連通を促進させて、ポリウレタンフォームの表面にスキン層を形成させずに、通気抵抗が１０００〜８０００Ｎｓ／ｍ３の低遮音性領域を形成させることができる。
したがって、この製造方法によれば、ポリウレタンフォーム表面の一部にスキン層が形成された防音性の高い防音材を容易に製造できる。 As described above, the mold temperature is set to 20 to 50 ° C., and the water-soluble release agent is applied to the mold part at the temperature to suppress the bubble communication, and the air flow resistance is 10,000 Ns on the surface of the polyurethane foam. A skin layer that is a highly sound-insulating region of / m 3 or more can be provided. Also, by setting the mold temperature to 40 to 70 ° C. and applying a solvent-type mold release agent to the mold part at that temperature, it is possible to promote the communication of bubbles without forming a skin layer on the surface of the polyurethane foam. A low sound insulation region having a ventilation resistance of 1000 to 8000 Ns / m 3 can be formed.
Therefore, according to this manufacturing method, it is possible to easily manufacture a soundproof material having a high soundproofing property in which a skin layer is formed on a part of the surface of the polyurethane foam.

（実施例）
縦１０００ｍｍ、横１０００ｍｍ、厚さ２５ｍｍのキャビティが形成される金型を用意し、スキン層を設ける部分の金型温度を４０℃に設定し、その他の部分の金型温度を５５℃に設定した。次いで、下側の金型の全面に溶剤型離型剤である中京油脂社製Ｈ−９６６をスプレー塗布し、その後、スキン層を設ける部分に水溶性離型剤であるＡＣＭＯＳ社製ＡＣＭＯＳＩＬ３７−５０１２−９０をスプレー塗布した。そして、金型内に、ポリオール化合物であるポリエーテルポリオール１００質量部、ＭＤＩ系イソシアネート化合物（インデックス１００）、触媒であるトリエチレンジアミン１．０質量部、発泡剤である水３質量部、シリコーン整泡剤０．５部を注入し、発泡成形した。
このようにして、縦１０００ｍｍ、横１０００ｍｍ、厚さ２５ｍｍ、密度が２．０ｋｇ／ｍ３であり、ポリウレタンフォームの表面に、通気抵抗が１００００Ｎｓ／ｍ３以上のスキン層（高遮音性領域）と、通気抵抗が５０００Ｎｓ／ｍ３の低遮音性領域とを有する防音材を得た。
そして、この防音材におけるランダム入射吸音率と音響透過損失とを測定した。その結果を図３および図４に示す。 (Example)
A mold in which a cavity having a length of 1000 mm, a width of 1000 mm, and a thickness of 25 mm is prepared, the mold temperature of the part where the skin layer is provided is set to 40 ° C., and the mold temperature of the other part is set to 55 ° C. . Next, H-966 made by Chukyo Yushi Co., Ltd., which is a solvent-type release agent, is spray coated on the entire surface of the lower mold, and then ACMOSIL37-5012 made by ACMOS, which is a water-soluble mold release agent, on the portion where the skin layer is provided. -90 was spray applied. In the mold, 100 parts by mass of a polyether polyol, which is a polyol compound, an MDI-based isocyanate compound (index 100), 1.0 part by mass of triethylenediamine, which is a catalyst, 3 parts by mass of water, which is a blowing agent, and a silicone foam stabilizer 0.5 parts of the agent was injected and foamed.
In this way, the skin layer (high sound insulation region) having a length of 1000 mm, a width of 1000 mm, a thickness of 25 mm, a density of 2.0 kg / m 3 , and a ventilation resistance of 10,000 Ns / m 3 or more on the surface of the polyurethane foam. Thus, a soundproof material having a low sound insulation region with a ventilation resistance of 5000 Ns / m 3 was obtained.
And the random incident sound absorption rate and sound transmission loss in this soundproof material were measured. The results are shown in FIGS.

なお、ランダム入射吸音率は、防音材のスキン層が形成されている方の面に向けて様々な角度で音を発射し、その面から反射してくる音を測定して求めた。また、音響透過損失は、防音材のスキン層が形成されていない方の面に向けて垂直に音を発射し、他方の面から漏れ出た音を測定して求めた。ランダム入射吸音率と音響透過損失のいずれも、その値の高い方が高性能であることを示す。なお、これらの測定において、音の発射方向にはスキン層が位置するようにした。   The random incident sound absorption coefficient was obtained by emitting sound at various angles toward the surface on which the skin layer of the soundproof material was formed and measuring the sound reflected from the surface. The sound transmission loss was obtained by emitting a sound vertically toward the surface where the skin layer of the soundproof material was not formed and measuring the sound leaked from the other surface. A higher value of both random incident sound absorption coefficient and sound transmission loss indicates higher performance. In these measurements, the skin layer was positioned in the sound emission direction.

（比較例）
金型内表面の全てに溶剤型離型剤である中京油脂社製Ｈ−９６６をスプレー塗布し、全ての部分の金型温度を５５℃に設定したこと以外は実施例と同様にして、スキン層が形成されず、全体にわたって通気抵抗が５０００Ｎｓ／ｍ３のポリウレタンフォームを得た。このポリウレタンフォームを防音材として用い、ランダム入射吸音率と音響透過損失とを測定した。その結果を図３および図４に示す。 (Comparative example)
Skin coating was performed in the same manner as in the example except that H-966 made by Chukyo Yushi Co., Ltd., which is a solvent-type release agent, was spray-coated on the entire inner surface of the mold, and the mold temperature of all parts was set to 55 ° C. A layer was not formed, and a polyurethane foam having a ventilation resistance of 5000 Ns / m 3 was obtained throughout. Using this polyurethane foam as a soundproof material, random incident sound absorption coefficient and sound transmission loss were measured. The results are shown in FIGS.

図３から、実施例の防音材と比較例の防音材とではランダム入射吸音率がほぼ同等であることがわかった。また、図４から、高遮音性領域であるスキン層が形成された実施例の防音材は音響透過損失が高く、遮音性に優れることがわかった。
したがって、実施例の防音材は、比較例の防音材と吸音性が同等で遮音性が高いものであるから、比較例の防音材より防音性を有している。しかも、実施例の防音材は、高比重の遮音シートを用いずにポリウレタンのみからなっているから軽量である。 From FIG. 3, it was found that the soundproofing material of the example and the soundproofing material of the comparative example have almost the same random incident sound absorption coefficient. Moreover, it was found from FIG. 4 that the soundproofing material of the example in which the skin layer which is a high sound insulation region was formed has high sound transmission loss and excellent sound insulation.
Therefore, the soundproofing material of the example has the same sound absorption as the soundproofing material of the comparative example and has a higher sound insulating property, and therefore has a soundproofing property than the soundproofing material of the comparative example. In addition, the soundproofing material of the example is lightweight because it is made of only polyurethane without using a sound insulating sheet having a high specific gravity.

本発明に係る実施形態例の防音材を示す上面図である。It is a top view which shows the soundproof material of the embodiment which concerns on this invention. 図１のＡ−Ａ’断面図である。It is A-A 'sectional drawing of FIG. 実施例および比較例における周波数に対するランダム入射吸音率のグラフである。It is a graph of the random incident sound absorption coefficient with respect to the frequency in an Example and a comparative example. 実施例および比較例における周波数に対する音響透過損失のグラフである。It is a graph of the sound transmission loss with respect to the frequency in an Example and a comparative example.

符号の説明Explanation of symbols

１ 防音材
１ａ ポリウレタンフォーム
１０ スキン層（高遮音性領域）
２０ 低遮音性領域 1 Soundproofing material 1a Polyurethane foam 10 Skin layer (high sound insulation area)
20 Low sound insulation area

Claims (4)

ポリウレタンフォームの表面に、通気抵抗が１００００Ｎｓ／ｍ３以上の高遮音性領域と、通気抵抗が１０００〜８０００Ｎｓ／ｍ３の低遮音性領域とを有することを特徴とする防音材。 A soundproofing material having a high sound insulation region with a ventilation resistance of 10,000 Ns / m 3 or more and a low sound insulation region with a ventilation resistance of 1000 to 8000 Ns / m 3 on the surface of the polyurethane foam. 高遮音性領域がポリウレタンのスキン層であることを特徴とする請求項１に記載の防音材。   The soundproofing material according to claim 1, wherein the high sound insulation region is a polyurethane skin layer. 発泡剤存在下、ポリオール化合物とイソシアネート化合物とを金型内で反応させて発泡成形する防音材の製造方法において、
金型内表面にあらかじめ溶剤型離型剤を塗布し、その後、金型内表面の一部に水溶性離型剤を塗布することを特徴とする防音材の製造方法。 In the production method of a soundproofing material in which a polyol compound and an isocyanate compound are reacted in a mold in the presence of a foaming agent to perform foam molding,
A method for producing a soundproof material, wherein a solvent-type release agent is applied in advance to an inner surface of a mold, and then a water-soluble release agent is applied to a part of the inner surface of the mold. 発泡成形の際に、溶剤型離型剤を塗布した部分の金型温度を４０〜７０℃にし、水溶性離型剤を塗布した部分の金型温度を２０〜５０℃にすることを特徴とする請求項３に記載の防音材の製造方法。   In the foam molding, the mold temperature of the part to which the solvent mold release agent is applied is set to 40 to 70 ° C., and the mold temperature of the part to which the water soluble mold release agent is applied is set to 20 to 50 ° C. The method for producing a soundproof material according to claim 3.
JP2004171112A 2004-06-09 2004-06-09 Acoustical material and method for preparation of the same Withdrawn JP2005350533A (en)

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JP2009527382A (en) * 2006-02-24 2009-07-30 バイエル マテリアルサイエンス アクチェンゲゼルシャフト Improved method for manufacturing a lightweight sound insulation cover for automobiles and its cover
CN104070740A (en) * 2013-03-25 2014-10-01 拜耳材料科技股份有限公司 Sound-absorbing composite material and its use
WO2018174070A1 (en) * 2017-03-23 2018-09-27 株式会社イノアックコーポレーション Soundproofing material and method for manufacturing same
JP2018159919A (en) * 2017-03-23 2018-10-11 株式会社イノアックコーポレーション Sound-insulating material and its manufacturing method
WO2021132387A1 (en) * 2019-12-26 2021-07-01 Ａｇｃ株式会社 Polyurethane foam and soundproofing material for vehicle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009527382A (en) * 2006-02-24 2009-07-30 バイエル マテリアルサイエンス アクチェンゲゼルシャフト Improved method for manufacturing a lightweight sound insulation cover for automobiles and its cover
US8276710B2 (en) 2006-02-24 2012-10-02 Bayer Materialscience Ag Method for producing a lightweight, sound insulating covering for motor vehicles and corresponding covering
CN104070740A (en) * 2013-03-25 2014-10-01 拜耳材料科技股份有限公司 Sound-absorbing composite material and its use
CN104070740B (en) * 2013-03-25 2017-10-10 科思创德国股份有限公司 Sound absorption composite material and application thereof
WO2018174070A1 (en) * 2017-03-23 2018-09-27 株式会社イノアックコーポレーション Soundproofing material and method for manufacturing same
JP2018159919A (en) * 2017-03-23 2018-10-11 株式会社イノアックコーポレーション Sound-insulating material and its manufacturing method
JP7105073B2 (en) 2017-03-23 2022-07-22 株式会社イノアックコーポレーション Soundproof structure
US11532294B2 (en) 2017-03-23 2022-12-20 Inoac Corporation Soundproof member and production method thereof
WO2021132387A1 (en) * 2019-12-26 2021-07-01 Ａｇｃ株式会社 Polyurethane foam and soundproofing material for vehicle
CN114846042A (en) * 2019-12-26 2022-08-02 Ａｇｃ株式会社 Polyurethane foam and sound insulation material for vehicle

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