JP2020019251A - 積層吸音材 - Google Patents
積層吸音材 Download PDFInfo
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- JP2020019251A JP2020019251A JP2018145932A JP2018145932A JP2020019251A JP 2020019251 A JP2020019251 A JP 2020019251A JP 2018145932 A JP2018145932 A JP 2018145932A JP 2018145932 A JP2018145932 A JP 2018145932A JP 2020019251 A JP2020019251 A JP 2020019251A
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Classifications
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Abstract
Description
[1]多孔質層と基材層とを含む積層吸音材であって、
前記多孔質層は、繊維層または微多孔膜からなる層であり、
前記多孔質層は、平均流量細孔径が0.1〜30μmであり、目付けが0.1〜200g/m2であり、
前記基材層は、1000Hzから12500Hzでの平均音響透過損失が、2dB以上であり、
前記基材層が音の入射側、前記多孔質層が音の透過側となるように配置される、積層吸音材。
[2]前記基材層が、不織布、織布、発泡フォーム、及びハニカムコアからなる群より選ばれる少なくとも1つである、[1]に記載の積層吸音材。
[3]前記多孔質層が、ポリフッ化ビニリデン、ナイロン6,6、ポリアクリロニトリル、ポリスチレン、ポリウレタン、ポリスルフォン、およびポリビニルアルコール、ポリエチレンフタレート、ポリブチレンテレフタレート、ポリエチレン、及びポリプロピレンからなる群から選ばれる少なくとも1種の繊維を含む不織布からなる繊維層である、[1]又は[2]に記載の積層吸音材。
[4]前記多孔質層及び前記基材層がそれぞれ1層含まれる、[1]〜[3]のいずれか1項に記載の積層吸音材。
[5]垂直入射吸音率測定法において、周波数が400Hzから1000Hzまでの吸音率の測定により、吸音率の平均吸音率(α)を算出し、平均吸音率(α)の値が下記式を満たす範囲である、[1]〜[4]のいずれか1項に記載の積層吸音材。
1.00 ≧ α ≧ 0.23
[6]垂直入射吸音率測定法において、周波数が1000Hzから3150Hzまでの吸音率の測定により、吸音率の平均吸音率(β)を算出し、平均吸音率(β)の値が下記式を満たす範囲である、[1]〜[5]のいずれか1項に記載の積層吸音材。
1.00 ≧ β ≧ 0.60
[7]垂直入射吸音率測定法において、周波数が2000Hzから5000Hzまでの吸音率の測定により、吸音率の平均吸音率(γ)を算出し、平均吸音率(γ)の値が下記式を満たす範囲である、[1]〜[6]のいずれか1項に記載の積層吸音材。
1.00 ≧ γ ≧ 0.85
[8]垂直入射吸音率測定法において、周波数が5000Hzから12500Hzまでの吸音率の測定により、吸音率の平均吸音率(η)を算出し、平均吸音率(η)の値が下記式を満たす範囲である、[1]〜[7]のいずれか1項に記載の積層吸音材。
1.00 ≧ η ≧ 0.90
(積層吸音材の構造)
本発明の積層吸音材は、多孔質層と、基材層とを含む積層吸音材であって、多孔質層は、平均流量細孔径が0.1〜30μmであり、目付けが0.1〜200g/m2であり、前記基材層は、1000Hzから12500Hzでの平均音響透過損失が、2dB以上であり、基材層が音の入射側、多孔質層が音の透過側となるように配置されるものである。
なお、本明細書において「基材層が音の入射側、多孔質層が音の透過側」とは、積層吸音材において、基材層が多孔質層よりも音の入射側に配置されている(言い換えると、多孔質層が基材層よりも音の透過側に配置されている)という相対的な位置関係を表す。すなわち、(入射側)基材層/多孔質層(透過側)という典型的な積層形態のみならず、(入射側)基材層/その他の層/基材層/多孔質層(透過側)、(入射側)基材層/多孔質層/その他の層(透過側)、(入射側)その他の層/基材層/多孔質層/その他の層(透過側)、(入射側)基材層/その他の層/多孔質層/その他の層(透過側)、という積層形態等も含む。
本発明の積層吸音材に含まれる多孔質層は、繊維層または微多孔膜からなる層であって、平均流量細孔径が0.1〜30μmであり、0.2〜20μmであればより好ましい。平均流量細孔径が0.2μm以上であれば、音の反射による吸音率の低下を抑えることができ、20μm以下であれば流れ抵抗を制御できるため吸音率を上昇させることができる。また、多孔質層は、目付けが0.1〜200g/m2とすることができる。目付が0.1g/m2以上であれば、流れ抵抗を制御できるため吸音率を上昇させることができ、200g/m2以下であれば、吸音材の厚みを薄く保つことができる。また、多孔質層は、厚みが3〜50mmであることが好ましい。
本発明に用いる繊維層としては、おおむね、平均繊維径が500nm未満である繊維からなる繊維集合体である。平均繊維径が500nm未満であれば、高い吸音性が得られるため好ましく、450nm未満であれば、より高い吸音性が得られるためさらに好ましい。平均繊維径の下限は特に限定されないが、平均繊維径が10nm以上であれば加工性に優れるため利用しやすい。平均繊維径の測定は、公知の方法によることができる。平均繊維径は、例えば、繊維層表面の拡大写真から測定ないし算出することによって得られる値であり、詳細な測定方法は実施例に詳述される。
繊維は、前記の樹脂の1種を含むことが好ましく、2種類以上を含んでいてもよい。
積層吸音材における基材層は、吸音性を有するとともに、多孔質層を支持して吸音材全体の形状を保持する機能を有している。本発明の積層吸音材において、多孔質層のうち、繊維層を用いた場合、繊維層は極めて細い繊維径の繊維から形成される繊維集合体であるか、微多孔膜であるため、強度(剛性)が低い。そのため、基材層が実質的に積層吸音材の強度を担うことになる。
平均音響透過損失の測定方法は公知の方法によることができる。具体的には実施例に詳述される。
基材層が、織布である場合にも同様の樹脂から構成される繊維を用いることができる。
本発明の積層吸音材は、1枚の吸音材で、400〜1000Hzの低周波数領域、1000〜3150Hzの中周波数領域、2000〜5000Hzの高周波数領域、また、5000〜12500Hzの超高周波領域のすべてにおいて高い吸音性能を示す。特定の理論に拘束されるものではないが、本発明の積層吸音材は、音の入射側に音響透過損失の高い材料を配置し、透過側に平均流量細孔径の小さな材料を配置することによって、流れ抵抗が制御され、高い吸音特性がえられている。
吸音性の評価方法は、実施例に詳述される。
積層吸音材の製造方法は特に制限されないが、例えば、基材層上に多孔質層を形成する方法、或いは、多孔質層を別の支持体上に作製しておき、基材層と支持体に支持された多孔質層とを一体化する方法等によって得ることができる。
実施例で用いた物性値の測定方法または定義を以下に示す。
株式会社日立ハイテクノロジーズ製の走査型電子顕微鏡SU8020を使用して、繊維構造体(不織布)を観察し、画像解析ソフトを用いて繊維50本の直径を測定した。繊維50本の繊維径の平均値を平均繊維径とした。
POROUS MATERIAL社製Capillary FlowPorometer(CFP−1200−A)を使用して、平均流量細孔径を測定(JIS K 3822)した。
吸音率測定は、各条件の積層をした、各繊維積層体より直径16.6mmのサンプルを採取し、垂直入射吸音率測定装置「日本音響エンジニアリング社製WinZacMTX」を用いASTM E 1050に準拠し、周波数400〜12500Hzにおける試験片に平面音波が垂直に入射するときの垂直入射吸音率を測定した。
<低周波数領域の吸音性>
周波数が400Hzから1000Hzまでの吸音率を測定し得られた曲線をf(x)としたとき、下記(式1)により平均吸音率(α)を算出した。
周波数が1000Hzから3150Hzまでの吸音率を測定し得られた曲線をf(x)としたとき、下記(式2)により平均吸音率(β)を算出した。
平均吸音率(β)は1000〜3150Hzの周波数領域の吸音性能を示し、数値が高ければ、吸音性が高いと判断される。βが0.60以上の場合、中周波数領域の吸音性を良好と評価し、0.60未満の場合、吸音性を不良と評価した。
周波数が2000Hzから5000Hzまでの吸音率を測定し得られた曲線をf(x)としたとき、下記(式3)により平均吸音率(γ)を算出した。
平均吸音率(γ)は2000〜5000Hzの周波数領域の吸音性能を示し、数値が高ければ、吸音性が高いと判断される。γが0.85以上の場合、高周波数領域の吸音性を良好と評価し、0.85未満の場合、吸音性を不良と評価した。
周波数が5000Hzから12500Hzまでの吸音率を測定し得られた曲線をf(x)としたとき、下記(式4)により平均吸音率(η)を算出した。
平均吸音率(η)は5000〜12500Hzの周波数領域の吸音性能を示し、数値が高ければ、吸音性が高いと判断される。ηが0.90以上の場合、高周波数領域の吸音性を良好と評価し、0.90未満の場合、吸音性を不良と評価した。
平均音響透過損失測定は、各基材層の単体より、直径16.6mmのサンプルを採取し、垂直入射吸音率測定装置「日本音響エンジニアリング社製WinZacMTX」を用い、ASTM E 1050に準拠し、垂直入射吸音率測定時に背後空間層(0mmと10mm)を変化させ、音響透過損失の周波数依存性を測定し、また、1000Hz〜12500Hz間で測定し、下記(式5)により得られた曲線をg(x)としたときの平均音響透過損失θを算出した。
保護層として、市販のポリエチレンテレフタレート製カード法スルーエア不織布(目付け18g/m2、厚み60μm)を準備した。
1)多孔質層A〜C(電界紡糸法による極細繊維不織布)
Arkema製のポリフッ化ビニリデン−ヘキサフルオロプロピレン(以下、「PVDF」と略記する。)であるKynar(商品名)3120を、N,N−ジメチルアセトアミドとアセトンの共溶媒(60/40(w/w))に15質量%の濃度で溶解し、電界紡糸溶液を調製し、導電助剤として0.01質量%を添加した。保護層の上に前記PVDF−HFP溶液を電界紡糸して、保護層とPVDF−HFP極細繊維との2層からなる繊維積層体を作製した。電界紡糸の条件は、24Gニードルを使用し、単孔溶液供給量は3.0mL/h、印加電圧は35kV、紡糸距離は17.5cmとした。
繊維積層体におけるPVDF極細繊維については、その層の目付けは0.6g/m2であり、平均繊維径は80nmであり、融解温度は168℃であった。これを多孔質層Aとした。平均流量細孔径を評価したところ1.5μmであった。
また保護層の搬送速度を変化させ、目付けを0.2g/m2となるように調節し、平均繊維径は80nmであり、融解温度は168℃であった。これを多孔質層Bとした。平均流量細孔径を評価したところ5.8μmであった。さらに目付けを6.0g/m2となるように調節し、平均繊維径は80nmであり、融解温度は168℃であった。これを多孔質層Cとした。平均流量細孔径を評価したところ0.7μmであった。
市販のADVANTEC製MEMBRANE FILTER T300A(PORE SIZE3.0μm 厚み75μm)の平均流量細孔径を評価したところ1.1μmであった。これを「多孔質層D」とした。同じくT100A(PORE SIZE1.0μm 厚み77μm)の平均流量細孔径を評価したところ0.53μmであった。これを「多孔質層E」とした。同じくT010A(PORE SIZE0.1μm 厚み80μm)の平均流量細孔径を評価したところ0.20μmであった。これを「多孔質層F」とした。
多孔質層の形成には、スクリュー(50mm径)、加熱体及びギアポンプを有する2機の押出機、混繊用紡糸口金(孔径0.3mm、2機の押出機より交互に樹脂が吐出される孔数501ホールが一列に並んだ、有効幅500mm)、圧縮空気発生装置及び空気加熱機、ポリエステル製ネットを備えた捕集コンベアー、及び巻取り機からなる不織布製造装置を用いた。
原料のポリプロピレンとして、ポリプロピレンホモポリマー1(MFR=82g/10分)と、ポリプロピレンホモポリマー2(LOTTE CHEMICAL社製「FR−185」(MFR=1400g/10分))を用い、不織布製造装置の2機の押出機に前記2種類のポリプロピレンを投入し、押出機を240℃で加熱溶融させ、ギアポンプの質量比が50/50になる様に設定し、紡糸口金から単孔あたり0.3g/minの紡糸速度で溶融樹脂を吐出させた。吐出した繊維を400℃に加熱した98kPa(ゲージ圧)の圧縮空気によって紡糸口金から60cmの距離で、捕集コンベアー上に吹き付け、多孔質層を形成した。捕集コンベアーの速度を調整することによって、目付を80g/m2に設定した。平均繊維径は、1.3μmであり、これを多孔質層Jとした。平均流量細孔径を評価したところ9.4μmであった。
多孔質層の形成には、スクリュー(50mm径)、加熱体及びギアポンプを有する2機の押出機、混繊用紡糸口金(孔径0.3mm、2機の押出機より交互に樹脂が吐出される孔数501ホールが一列に並んだ、有効幅500mm)、圧縮空気発生装置及び空気加熱機、ポリエステル製ネットを備えた捕集コンベアー、及び巻取り機からなる不織布製造装置を用いた。
原料のポリプロピレンとして、ポリプロピレンホモポリマー1(MFR=82g/10分)と、ポリプロピレンホモポリマー2(LOTTE CHEMICAL社製「FR−185」(MFR=1400g/10分))を用い、不織布製造装置の2機の押出機に前記2種類のポリプロピレンを投入し、押出機を240℃で加熱溶融させ、ギアポンプの質量比が50/50になる様に設定し、紡糸口金から単孔あたり0.3g/minの紡糸速度で溶融樹脂を吐出させた。吐出した繊維を400℃に加熱した63kPa(ゲージ圧)の圧縮空気によって紡糸口金から60cmの距離で、捕集コンベアー上に吹き付け、多孔質層を形成した。捕集コンベアーの速度を調整することによって、目付を80g/m2に設定した。平均繊維径は、1.9μmであり、これを多孔質層Rとした。平均流量細孔径を評価したところ12.6μmであった。
多孔質層の形成には、スクリュー(50mm径)、加熱体及びギアポンプを有する2機の押出機、混繊用紡糸口金(孔径0.3mm、2機の押出機より交互に樹脂が吐出される孔数501ホールが一列に並んだ、有効幅500mm)、圧縮空気発生装置及び空気加熱機、ポリエステル製ネットを備えた捕集コンベアー、及び巻取り機からなる不織布製造装置を用いた。
原料のポリプロピレンとして、ポリプロピレンホモポリマー1(MFR=82g/10分)のポリプロピレンを2機の押出機に投入し、押出機を240℃で加熱溶融させ、ギアポンプの質量比が50/50になる様に設定し、紡糸口金から単孔あたり0.3g/minの紡糸速度で溶融樹脂を吐出させた。吐出した繊維を400℃に加熱した63kPa(ゲージ圧)の圧縮空気によって紡糸口金から30cmの距離で、捕集コンベアー上に吹き付け、多孔質層を形成した。捕集コンベアーの速度を調整することによって、目付を60g/m2に設定した。平均繊維径は、4.0μmであり、これを多孔質層Pとした。平均流量細孔径を評価したところ20μmであった。
市販の無延伸ポリプロピレンフィルムオージェイケイ株式会社製 製品名「25SS」、厚み25μmを用意した。
多孔質層の形成には、スクリュー(50mm径)、加熱体及びギアポンプを有する2機の押出機、混繊用紡糸口金(孔径0.3mm、2機の押出機より交互に樹脂が吐出される孔数501ホールが一列に並んだ、有効幅500mm)、圧縮空気発生装置及び空気加熱機、ポリエステル製ネットを備えた捕集コンベアー、及び巻取り機からなる不織布製造装置を用いた。
原料のポリプロピレンとして、ポリプロピレンホモポリマー1(MFR=82g/10分)のポリプロピレンを2機の押出機に投入し、押出機を240℃で加熱溶融させ、ギアポンプの質量比が50/50になる様に設定し、紡糸口金から単孔あたり0.3g/minの紡糸速度で溶融樹脂を吐出させた。吐出した繊維を400℃に加熱した63kPa(ゲージ圧)の圧縮空気によって紡糸口金から60cmの距離で、捕集コンベアー上に吹き付け、多孔質層を形成した。捕集コンベアーの速度を調整することによって、目付を60g/m2に設定した。平均繊維径は、4.0μmであり、これを多孔質層Qとした。平均流量細孔径を評価したところ34μmであった。
1)基材層A〜C(エアレイド不織布)
高密度ポリエチレンとして、京葉ポリエチレン製の高密度ポリエチレン「M6900」(MFR17g/10分)を用い、ポリプロピレンとして、日本ポリプロ製のポリプロピレンホモポリマー「SA3A」(MFR=11g/10分)を用いて、熱溶融紡糸法により、繊維径16μmの鞘成分が高密度ポリエチレン、芯成分がポリプロピレンからなる鞘芯型熱融着性複合繊維を作製した。得られた鞘芯型熱融着性複合繊維を用いて、目付けが200g/m2、厚み5mm、幅が1000mmのカード法スルーエア不織布を作製した。カード法スルーエア不織布を、商研株式会社製一軸式粉砕機(ES3280)にて約6mm程度に粉砕した。
この粉砕した不織布をエアレイド試験機にて、設定温度142℃で加熱し、目付け160g/m2、厚み5mm、音響透過損失1.3dBの基材層A、320g/m2、厚み10mm、音響透過損失2.4dBの基材層B、480g/m2、厚み15mm、音響透過損失3.5dBの基材層Cを得た。
市販されているメラミン発泡樹脂材料として、イノアック社製バソテクト BAF-10G+(密度9.2kg/m3)、厚み10mm、音響透過損失2.5dBを基材D、厚み15mm、音響透過損失3.0dBを基材E、厚み5mm、音響透過損失1.1dBを基材H、BAF-10W(密度9.0kg/m3)、厚み10mm、音響透過損失2.8dBを基材F、厚み15mm、音響透過損失4.1dBを基材G、厚み5mm、音響透過損失1.0dBを基材Mとした。
市販されているウレタン発泡樹脂材料として、イノアック社製カームフレックス F−2(密度25kg/m3)、厚み10mm音響透過損失3.1dBを基材I、厚み15mm音響透過損失4.3dBを基材J、厚み20mm音響透過損失6.1dBを基材Kとした。
市販されているガラス繊維材料として、旭ファイバーグラス社製アクリアマット厚み50mmを目付け320gsm厚み20mm音響透過損失6.6dBに加工し基材Lとした。
表1、2に示される組み合わせで基材層と多孔質層とを重ね合わせ、吸音率測定用サンプルとした。基材層を音の入射側、多孔質層を音の透過側として、上述の方法で吸音率を測定した。低周波数領域、中周波数領域、高周波数領域、超高周波数領域それぞれの平均吸音率を表1、2に示す。なお、表中、積層吸音材のトータル厚み(mm)は、基材層及び多孔質層の厚みの合計であるが、多孔質層A〜Cは極めて薄いため、基材層の厚みとトータル厚みとが同じ数値となっている。
市販されているポリプロピレン樹脂製不織布(3M社製シンサレートT2203、繊維径0.7μm〜4.0μm、厚み29mm)を円形に打ち抜き、吸音率測定用サンプルとした。
垂直入射吸音率を測定し、低周波数領域の吸音性(400Hzから1000Hzまでの平均した値α)を評価したところ、0.157であり、中周波数領域の吸音性(1000Hzから3150Hzまでの平均した値β)を評価したところ、0.519であり、高周波数領域の吸音性(2000Hzから5000Hzまでの平均した値γ)を評価したところ、0.763であり、超高周波数領域の吸音性(5000Hzから12500Hzまでの平均した値η)を評価したところ、0.953であった。
表3に示される組み合わせで基材層と多孔質層とを重ね合わせ、あるいは基材層単体で、吸音率測定用サンプルとした。基材層を音の入射側、多孔質層を音の透過側として、上述の方法で吸音率を測定した。低周波数領域、中周波数領域、高周波数領域、超高周波数領域それぞれの平均吸音率を表3に示す。
Claims (8)
- 多孔質層と、基材層とを含む積層吸音材であって、
前記多孔質層は、繊維層または微多孔膜からなる層であり、
前記多孔質層は、平均流量細孔径が0.1〜30μmであり、目付けが0.1〜200g/m2であり、
前記基材層は、1000Hzから12500Hzでの平均音響透過損失が、2dB以上であり、
前記基材層が音の入射側、前記多孔質層が音の透過側となるように配置される、積層吸音材。 - 前記基材層が、不織布、織布、発泡フォーム、及びハニカムコアからなる群より選ばれる少なくとも1つである、請求項1に記載の積層吸音材。
- 前記多孔質層が、ポリフッ化ビニリデン、ナイロン6,6、ポリアクリロニトリル、ポリスチレン、ポリウレタン、ポリスルフォン、およびポリビニルアルコール、ポリエチレンフタレート、ポリブチレンテレフタレート、ポリエチレン、及びポリプロピレンからなる群から選ばれる少なくとも1種の繊維を含む不織布からなる繊維層である、請求項1又は2に記載の積層吸音材。
- 前記多孔質層及び前記基材層がそれぞれ1層含まれる、請求項1〜3のいずれか1項に記載の積層吸音材。
- 垂直入射吸音率測定法において、周波数が400Hzから1000Hzまでの吸音率の測定により、吸音率の平均吸音率(α)を算出し、平均吸音率(α)の値が下記式を満たす範囲である、請求項1〜4のいずれか1項に記載の積層吸音材。
1.00 ≧ α ≧ 0.23 - 垂直入射吸音率測定法において、周波数が1000Hzから3150Hzまでの吸音率の測定により、吸音率の平均吸音率(β)を算出し、平均吸音率(β)の値が下記式を満たす範囲である、請求項1〜5のいずれか1項に記載の積層吸音材。
1.00 ≧ β ≧ 0.60 - 垂直入射吸音率測定法において、周波数が2000Hzから5000Hzまでの吸音率の測定により、吸音率の平均吸音率(γ)を算出し、平均吸音率(γ)の値が下記式を満たす範囲である、請求項1〜6のいずれか1項に記載の積層吸音材。
1.00 ≧ γ ≧ 0.85 - 垂直入射吸音率測定法において、周波数が5000Hzから12500Hzまでの吸音率の測定により、吸音率の平均吸音率(η)を算出し、平均吸音率(η)の値が下記式を満たす範囲である、請求項1〜7のいずれか1項に記載の積層吸音材。
1.00 ≧ η ≧ 0.90
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