JP2012145627A - Sound-absorbing-property composite sheet - Google Patents
Sound-absorbing-property composite sheet Download PDFInfo
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- JP2012145627A JP2012145627A JP2011001846A JP2011001846A JP2012145627A JP 2012145627 A JP2012145627 A JP 2012145627A JP 2011001846 A JP2011001846 A JP 2011001846A JP 2011001846 A JP2011001846 A JP 2011001846A JP 2012145627 A JP2012145627 A JP 2012145627A
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Abstract
Description
本発明は、吸音性に優れ、不燃性、断熱性及び軽量である吸音特性複合シートに関するものである。 The present invention relates to a sound-absorbing property composite sheet that is excellent in sound-absorbing property, non-combustible, heat-insulating, and lightweight.
自動車や列車等の車両や産業機械、電気製品等には種々の構成の吸音材が知られており、繊維状不織布を用いた物やハニカム吸音材等が提案されている。 Various types of sound absorbing materials are known for vehicles such as automobiles and trains, industrial machines, electrical products, and the like, and materials using fibrous nonwoven fabrics, honeycomb sound absorbing materials, and the like have been proposed.
しかしながら、特許文献記載の吸音材は、周波数２０００〜５０００Ｈｚの範囲内に吸音率のピークがあり、それより低い２０００Ｈｚ以下の周波数では吸音性能が劣っていた。 However, the sound absorbing material described in the patent document has a sound absorption coefficient peak in the frequency range of 2000 to 5000 Hz, and the sound absorbing performance is inferior at frequencies lower than 2000 Hz.
本発明の目的は、上記課題を解決する吸音材を提供することにある。 An object of the present invention is to provide a sound absorbing material that solves the above-described problems.
本発明者は、上記課題を解決すべく鋭意検討した結果、吸音性、断熱性に優れるハニカム構造のポリオレフィン系発泡体の上下に、不燃性を有するポリオレフィン系発泡体シートを熱融着した複合シートを開発した。 As a result of intensive studies to solve the above-mentioned problems, the present inventor has obtained a composite sheet obtained by thermally fusing a non-flammable polyolefin foam sheet above and below a honeycomb-structured polyolefin foam excellent in sound absorption and heat insulation. Developed.
本発明の吸音特性複合シートは、周波数１０００Ｈｚにおける吸音率が８０％であり、不燃性、断熱性及び軽量であり、自動車や列車等の車両や産業機械、電気製品等の吸音断熱材として用いることができる。 The sound absorption characteristic composite sheet of the present invention has a sound absorption rate of 80% at a frequency of 1000 Hz, is non-flammable, heat insulating, and lightweight, and is used as a sound absorbing heat insulating material for vehicles such as automobiles and trains, industrial machines, and electrical products. Can do.
以下に添付図面を参照して、本発明に係る吸音特性複合シートの実施の形態について詳細に説明する。 Embodiments of a sound-absorbing property composite sheet according to the present invention will be described below in detail with reference to the accompanying drawings.
図１及び図２は、それぞれ本発明の実施の形態である吸音特性複合シートを示すものであり、図１は、水平方向の断面図であり、図２は、垂直方向の断面図である。 1 and 2 each show a sound-absorbing characteristic composite sheet according to an embodiment of the present invention. FIG. 1 is a horizontal sectional view, and FIG. 2 is a vertical sectional view.
本発明の吸音特性複合シートは、ポリオレフィン系発泡体２で構成されたハニカム構造の基材の上下に、不燃性を有するポリオレフィン系発泡体シート３を積層した構造を有する。 The sound-absorbing property composite sheet of the present invention has a structure in which a polyolefin-based foam sheet 3 having nonflammability is laminated on the top and bottom of a honeycomb-structured substrate composed of a polyolefin-based foam 2.
ポリオレフィン系発泡体２は、ポリオレフィン樹脂に発泡剤、架橋剤を添加して発泡させて得られる。発泡倍率は１０〜４０倍であることが好ましい。発泡倍率が１０倍未満の場合は、発泡体が硬く、複合シートの重量が重くなり、吸音性、断熱性も劣る。発泡倍率が４０倍を超える場合は、均一な発泡体が得られない。 The polyolefin-based foam 2 is obtained by adding a foaming agent and a crosslinking agent to a polyolefin resin and foaming. The expansion ratio is preferably 10 to 40 times. When the expansion ratio is less than 10 times, the foam is hard, the composite sheet is heavy, and the sound absorption and heat insulation properties are also inferior. When the expansion ratio exceeds 40 times, a uniform foam cannot be obtained.
ポリオレフィン系発泡体シート３は、ポリオレフィン樹脂に発泡剤、架橋剤、金属水和物を添加して発泡させて得られる、発泡倍率２０〜３０倍の発泡シートである。また必要に応じて、ハロゲン系やリン系の難燃剤や三酸化アンチモン等の難燃助剤を添加することもある。ポリオレフィン系発泡体シート３は、不燃性を有しており、国土交通省の不燃材の認定を受けている。 The polyolefin-based foam sheet 3 is a foamed sheet obtained by adding a foaming agent, a cross-linking agent, and a metal hydrate to a polyolefin resin and foaming it, and having a foaming ratio of 20 to 30 times. If necessary, a flame retardant aid such as a halogen-based or phosphorus-based flame retardant or antimony trioxide may be added. The polyolefin-based foam sheet 3 has nonflammability and has been certified as a nonflammable material by the Ministry of Land, Infrastructure, Transport and Tourism.
本発明でいうポリオレフィンとは、エチレン−酢酸ビニル共重合体を除く、例えば、ポリエチレン、ポリプロピレン、ポリテトラフルオロエチレン、エチレン−プロピレン共重合体、ポリ−４−メチル−１−ペンテン、ポリビニルクロライド、ポリビニリデンクロライド、ポリビニリデンフルオライド、テトラフルオロエチレン、エチレン共重合体を挙げることができる。 The polyolefin referred to in the present invention is excluding ethylene-vinyl acetate copolymer, for example, polyethylene, polypropylene, polytetrafluoroethylene, ethylene-propylene copolymer, poly-4-methyl-1-pentene, polyvinyl chloride, poly Examples thereof include vinylidene chloride, polyvinylidene fluoride, tetrafluoroethylene, and an ethylene copolymer.
本発明でいう発泡剤とは、ポリオレフィン樹脂の溶融温度以上の分解温度を有する化学発泡剤であり、例えばアゾ系化合物のアゾジカルボンアミド、バリウムアゾジカルボキシレート等；ニトロソ系化合物のジニトロソペンタメチレンテトラミン、トリニトロトリメチルトリアミン等；ヒドラジッド系化合物のｐ，ｐ‘−オキシビスベンゼンスルホニルヒドラジッド等；スルホニルセミカルバジッド系化合物のｐ，ｐ‘−オキシビスベンゼンスルホニルセミカルバジッド、トルエンスルホニルセミカルバジッド等がある。 The foaming agent referred to in the present invention is a chemical foaming agent having a decomposition temperature equal to or higher than the melting temperature of the polyolefin resin. For example, azo compounds such as azodicarbonamide and barium azodicarboxylate; nitroso compounds dinitrosopentamethylene Tetramine, trinitrotrimethyltriamine, etc .; p, p′-oxybisbenzenesulfonyl hydrazide, etc. of hydrazide compounds; p, p′-oxybisbenzenesulfonyl semicarbazide, toluenesulfonyl semicarbazide of sulfonyl semicarbazide compounds, etc. Etc.
本発明でいう架橋剤とは、ポリエチレン系樹脂中において少なくともポリエチレン樹脂の流動開始温度以上の分解温度を有するものであって、加熱により分解され、遊離ラジカルを発生してその分子間もしくは分子内に架橋結合を生じせしめるラジカル発生剤であるところの有機過酸化物、例えばジクミルパーオキサイド、１，１−ジターシャリーブチルパーオキサイド、１，１−ジターシャリーブチルパーオキシー３，３，５−トリメチルシクロヘキサン、２，５−ジメチルー２，５−ジターシャリーブチルパーオキシヘキサン、２，５−ジメチルー２，５−ジターシャリーブチルパーオキシヘキシン、α、α―ジターシャリーブチルパーオキシイソプロピルベンゼン、ターシャリーブチルパーオキシケトン、ターシャリーブチルパーオキシベンゾエートなどがあるが、その時に使用される樹脂によって最適な有機過酸化物を選択しなければならない。 The cross-linking agent as used in the present invention has a decomposition temperature at least equal to or higher than the flow start temperature of the polyethylene resin in the polyethylene-based resin, and is decomposed by heating to generate free radicals between the molecules or within the molecules. Organic peroxides that are radical generators that cause cross-linking, such as dicumyl peroxide, 1,1-ditertiary butyl peroxide, 1,1-ditertiary butyl peroxy-3,3,5-trimethylcyclohexane 2,5-dimethyl-2,5-ditertiary butyl peroxyhexane, 2,5-dimethyl-2,5-ditertiary butyl peroxyhexyne, α, α-ditertiary butyl peroxyisopropylbenzene, tertiary butyl per Oxyketone, tertiary butyl peroxy There are benzoates, etc., and the optimum organic peroxide must be selected according to the resin used at that time.
本発明でいう金属水和物とは、水酸化マグネシウム、水酸化アルミニウム等がある。 Examples of the metal hydrate referred to in the present invention include magnesium hydroxide and aluminum hydroxide.
本発明において、発泡助剤を発泡剤の種類に応じて添加することができる。発泡助剤としては尿素を主成分とした化合物、酸化亜鉛、酸化鉛等の金属酸化物、サリチル酸、ステアリン酸等を主成分とする化合物、即ち高級脂肪酸あるいは高級脂肪酸の金属化合物などがある。 In the present invention, a foaming aid can be added depending on the type of foaming agent. Examples of the foaming aid include compounds mainly composed of urea, metal oxides such as zinc oxide and lead oxide, compounds mainly composed of salicylic acid and stearic acid, that is, higher fatty acids or higher fatty acid metal compounds.
次に本発明の吸音性複合シートについて図面に基づいてその好適な態様を具体的に説明する。ただし、以下に示す実施例は、本発明の技術思想を具体化するための吸音性複合シートを例示するものであって、下記の構造に何等限定されるものではない。
なお、本発明の吸音特性複合シートの評価は、以下の方法で測定した数値を採用した。
Next, preferred embodiments of the sound-absorbing composite sheet of the present invention will be specifically described with reference to the drawings. However, the example shown below illustrates the sound-absorbing composite sheet for embodying the technical idea of the present invention, and is not limited to the following structure.
In addition, the numerical value measured with the following method was employ | adopted for evaluation of the sound-absorption characteristic composite sheet of this invention.
（吸音率）ＪＩＳ Ａ−１４０９に従って、垂直入射吸音率を測定した。 (Sound Absorption Rate) The normal incident sound absorption rate was measured according to JIS A-1409.
（断熱性）ＪＩＳ Ａ１４１２−２（熱流計法）により熱伝導率を測定した。 (Insulation) Thermal conductivity was measured according to JIS A1412-2 (heat flow meter method).
厚み２０ｍｍのポリオレフィン樹脂からなる発泡体（商品名：サンペルカＬ−２５００、発泡倍率３０倍、三和化工株式会社製）を６角形の形状で打ち抜きハニカム構造に加工した。加工した発泡体の上下に厚み５ｍｍの不燃性を有するポリオレフィン系発泡体シート（商品名：フネンエース、古河電気工業株式会社製）
を融着して、吸音特性複合シートを作成した。
A foam made of a polyolefin resin having a thickness of 20 mm (trade name: Sanperca L-2500, expansion ratio 30 times, manufactured by Sanwa Chemical Co., Ltd.) was punched into a hexagonal shape and processed into a honeycomb structure. Polyolefin foam sheet having a non-combustibility thickness of 5 mm above and below the processed foam (trade name: Funenace, manufactured by Furukawa Electric Co., Ltd.)
Was fused to create a sound absorbing characteristic composite sheet.
作成した吸音特性複合シートの吸音率を測定したところ、図３に示すとおり、周波数１０００Ｈｚにおける吸音率が８０％であり、優れた吸音特性を有していた。 When the sound absorption coefficient of the produced sound absorption characteristic composite sheet was measured, as shown in FIG. 3, the sound absorption coefficient at a frequency of 1000 Hz was 80%, and the sound absorption characteristic was excellent.
作成した吸音特性複合シートの熱伝導率を測定したところ、０℃における熱伝導率が０．０４５Ｗ／ｍ・Ｋであり、優れた断熱性を有していた。 When the thermal conductivity of the produced sound-absorbing property composite sheet was measured, the thermal conductivity at 0 ° C. was 0.045 W / m · K, and it had excellent heat insulating properties.
本発明の吸音特性複合シートは、２０００Ｈｚ以下の低周波数における吸音率に優れ、不燃性、断熱性及び軽量であり、自動車や列車等の車両や産業機械、電気製品等の吸音断熱材として用いることができる。 The sound-absorbing property composite sheet of the present invention is excellent in sound absorption at a low frequency of 2000 Hz or less, is nonflammable, heat-insulating, and lightweight, and is used as a sound-absorbing heat insulating material for vehicles such as automobiles and trains, industrial machines, and electrical products. Can do.
１ 吸音特性複合シート
２ ポリオレフィン系発泡体
３ ポリオレフィン系発泡体シート
DESCRIPTION OF SYMBOLS 1 Sound absorption characteristic composite sheet 2 Polyolefin foam 3 Polyolefin foam sheet
Claims (4)
The sound absorbing characteristic composite sheet according to claim 1, wherein the polyolefin-based foam sheet is nonflammable.
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| JP2011001846A JP2012145627A (en) | 2011-01-07 | 2011-01-07 | Sound-absorbing-property composite sheet |
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| JP2011001846A JP2012145627A (en) | 2011-01-07 | 2011-01-07 | Sound-absorbing-property composite sheet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019039360A1 (en) * | 2017-08-25 | 2019-02-28 | キョーラク株式会社 | Structure, structure for vehicles and air conditioning duct for vehicles |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009019495A (en) * | 2002-03-26 | 2009-01-29 | Ube Nitto Kasei Co Ltd | Sound absorbing structure plate |
| WO2009037765A1 (en) * | 2007-09-20 | 2009-03-26 | Nagoya Oilchemical Co., Ltd. | Buffering and sound-absorbing member |
| JP2010277017A (en) * | 2009-06-01 | 2010-12-09 | Inoac Corp | Sound absorbing panel |
-
2011
- 2011-01-07 JP JP2011001846A patent/JP2012145627A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009019495A (en) * | 2002-03-26 | 2009-01-29 | Ube Nitto Kasei Co Ltd | Sound absorbing structure plate |
| WO2009037765A1 (en) * | 2007-09-20 | 2009-03-26 | Nagoya Oilchemical Co., Ltd. | Buffering and sound-absorbing member |
| JP2010277017A (en) * | 2009-06-01 | 2010-12-09 | Inoac Corp | Sound absorbing panel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019039360A1 (en) * | 2017-08-25 | 2019-02-28 | キョーラク株式会社 | Structure, structure for vehicles and air conditioning duct for vehicles |
| JP2019040067A (en) * | 2017-08-25 | 2019-03-14 | キョーラク株式会社 | Structure, structure for vehicle and air conditioning duct |
| CN111052224A (en) * | 2017-08-25 | 2020-04-21 | 京洛株式会社 | Structure, structure for vehicle, and air-conditioning duct for vehicle |
| US11701860B2 (en) | 2017-08-25 | 2023-07-18 | Kyoraku Co., Ltd. | Structure, structure for vehicles, and air conditioning duct for vehicles |
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