JP6877530B2 - エレクトレット化シートおよびフィルター - Google Patents
エレクトレット化シートおよびフィルター Download PDFInfo
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- JP6877530B2 JP6877530B2 JP2019504653A JP2019504653A JP6877530B2 JP 6877530 B2 JP6877530 B2 JP 6877530B2 JP 2019504653 A JP2019504653 A JP 2019504653A JP 2019504653 A JP2019504653 A JP 2019504653A JP 6877530 B2 JP6877530 B2 JP 6877530B2
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Description
すなわち、本発明は下記の通りである。
前記表面層および前記裏面層はそれぞれ100kHzにおける比誘電率が6未満の熱可塑性樹脂フィルムであり、
前記高誘電体層は100kHzにおける比誘電率が6以上の材料であり、
前記表面層および前記裏面層は帯電処理による静電気を有していることを特徴とする、
エレクトレット化シート。
(2)前記高誘電体層が、比誘電率が10〜30の4級アンモニウム塩型構造を有する水溶性ポリマーを含む、前記(1)に記載のエレクトレット化シート。
(3)前記表面層及び裏面層がポリオレフィン系樹脂フィルムである、前記(1)または(2)に記載のエレクトレット化シート。
(4)温度15℃の条件でイオン交換水に1分浸漬して引上げ、水をふき取り、温度23℃、湿度50%RHの環境下で24時間放置した時の表面電位(洗浄24時間後表面電位E24)が、0.2kV以上5kV以下である、前記(1)〜(3)のいずれか1に記載のエレクトレット化シート。
(5)温度15℃の条件でイオン交換水に1分浸漬して引上げ、水をふき取り、温度23℃、湿度50%RHの環境下で24時間放置した時の表面電位を洗浄24時間後表面電位E24とし、温度15℃の条件でイオン交換水に1分浸漬して引上げ、水をふき取り、温度23℃、湿度50%RHの環境下で30分間放置した時の表面電位を洗浄0.5時間後表面電位E0.5としたとき、前記洗浄24時間後表面電位と洗浄0.5時間後表面電位との差(E24−E0.5)が0.1kV以上5kV以下である、前記(1)〜(4)のいずれか1に記載のエレクトレット化シート。
(6)前記(1)〜(5)のいずれか1に記載のエレクトレット化シートを用いて空気の流路を形成したフィルター。
(7)空気の流路断面率が10%以上99%以下である、前記(6)に記載のフィルター。
本発明のエレクトレット化シートは、表面層、高誘電体層、および裏面層を少なくとも含み、前記表面層と前記裏面層との間に前記高誘電体層を有するエレクトレット化シートであって、前記表面層および前記裏面層はそれぞれ100kHzにおける比誘電率が6未満の熱可塑性樹脂フィルムであり、前記高誘電体層は100kHzにおける比誘電率が6以上の材料であり、前記表面層および前記裏面層は帯電処理による静電気を有していることを特徴とする。
本発明のエレクトレット化シートは、上述したように、表面層、高誘電体層、および裏面層を少なくとも含む積層体からなり、表面層と裏面層との間に高誘電体層を有する。
なお本発明における表面層と裏面層は、いずれも本発明のエレクトレット化シート(あるいは積層体)の最外層である。また表面層および裏面層が、これらの層より内側に存在するいずれの層よりも低い比誘電率を示す場合、最外層表面に存在する電荷の移動が起こりにくく、帯電減衰を生じにくいため好ましい。
・表面層2a/高誘電体層3/裏面層2bの順に積層されたエレクトレット化シート1(図1参照)、
・表面層/接着剤層/高誘電体層/裏面層の順に積層されたエレクトレット化シート、
・表面層2a/第1の接着剤層4a/高誘電体層3/第2の接着剤層4b/裏面層2bの順に積層されたエレクトレット化シート1(図2参照)、
・表面層/第1の高誘電体層/接着剤層/第2の高誘電体層/裏面層の順に積層されたエレクトレット化シート、
・表面層2a/第1の高誘電体層3a/中間層2c/第2の高誘電体層3b/裏面層2bの順に積層されたエレクトレット化シート1(図3参照)、
・表面層/第1の接着剤層/第1の高誘電体層/第2の接着剤層/中間層/第3の接着剤層/第2の高誘電体層/第4の接着剤層/裏面層、等が挙げられる。
本発明のエレクトレット化シートは、表面層と裏面層との間に高誘電体層を設ける。ここで高誘電体層は、バルク材料として100kHzで測定したときに比誘電率が6以上の材料からなるものである。
Cx=εr×A/h ・・・(1)
高誘電体層は表面層と裏面層との間に設けるが、いずれかの層の内側に接着し積層体としてエレクトレット化シートを構成するため、高誘電体層が接着性を有していることが好ましい。そのため、高誘電体層を構成する材料の少なくとも1つが接着性を有していることが好ましい。
本発明のエレクトレット化シートは最表面に、表面層および裏面層のそれぞれを有する。すなわち、表面層および裏面層はいずれも本発明のエレクトレット化シートの最外層である。
εr = Cx × h /(ε0 × A)
εr: エレクトレット化シートの各層の比誘電率(−)
Cx: エレクトレット化シートの各層の静電容量(pF)
h : エレクトレット化シートの各層の厚み(m)
ε0: 真空の誘電率=8.854(pF/m)
A : 主電極の面積=3.848×10−4(m2)
表面層および裏面層に用いる熱可塑性樹脂の種類は特に制限されないが、100kHzで測定したときの比誘電率が高誘電体層に比べて低いことから、熱可塑性樹脂の例としては、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン、プロピレン系樹脂、及びポリメチル−1−ペンテン等のポリオレフィン系樹脂;エチレン・酢酸ビニル共重合体、エチレン・アクリル酸共重合体、マレイン酸変性ポリエチレン、及びマレイン酸変性ポリプロピレン等の官能基含有ポリオレフィン系樹脂;ナイロン−6、及びナイロン−6,6等のポリアミド系樹脂;ポリエチレンテレフタレートやその共重合体、ポリブチレンテレフタレート、及び脂肪族ポリエステル等の熱可塑性ポリエステル系樹脂;ポリカーボネート系樹脂;アタクティックポリスチレン、及びシンジオタクティックポリスチレン等のポリスチレン系樹脂等が挙げられる。
表面層および裏面層は、その中にボイド(空隙)を形成し、樹脂と空気との界面(表面積)を増加させることで、エレクトレット化シートの帯電性を向上させる観点から、無機微細粉末および有機フィラーの少なくとも1種、好ましくは無機微細粉末を配合することができる。
表面層および裏面層の熱可塑性樹脂組成物には、必要に応じて、熱安定剤(酸化防止剤)、光安定剤、分散剤、及び滑剤などを添加することができる。
エレクトレット化シートは、立体形状付与の観点から、表面層および裏面層とは別に、100kHzにおける比誘電率が6未満の熱可塑性樹脂フィルム層からなる中間層を有していてもよい。中間層を介して高誘電体層を複数積層することもできる。
本発明のエレクトレット化シートの製造工程は、表面層と裏面層との間に高誘電体層を有する積層体を成形する工程と、前記積層体に帯電処理を行う工程とを含む。エレクトレット化シートの製造工程における帯電処理工程の位置は、帯電処理工程の煩雑さ、帯電処理シートの取り扱い、設備上の制約、フィルターの要求性能等を勘案し、適宜決定することができる。すなわち、積層体を成形する工程の中で帯電処理を行なって直接エレクトレット化シートを得てもよく、積層体に対して帯電処理を行ってエレクトレット化シートを得てもよく、帯電処理していない積層体をフィルターの立体形状に加工してから帯電処理を行なってエレクトレット化シートを有するフィルターを得てもよい。
表面層、裏面層、および必要に応じて設けられる中間層は、熱可塑性樹脂フィルムとして成形される。
表面層、裏面層、高誘電体層、及び必要に応じて設けられる中間層を含んでなる積層体を得るための積層方法としては、前記の熱可塑性樹脂フィルムの多層化と同様な共押出法および押出ラミネート法によるインライン法、表面層である熱可塑性樹脂フィルムと裏面層である別の熱可塑性樹脂フィルムとで高誘電体層等を挟み込むアウトライン法が挙げられる。積層時に前記接着剤層を使用して各層を結合してもよい。
次いで、他の層を重ね、圧着ロールで加圧接着することにより積層が完了する。
積層体に帯電処理を行う方法としては、例えば、摩擦帯電、剥離帯電、コロナ放電やパルス状高電圧を加えるエレクトロエレクトレット化法、熱可塑性樹脂フィルムの両面を誘電体で保持し、両面に直流高電圧を加える方法、熱可塑性樹脂フィルムにγ線や電子線等の電離放射線を照射するラジオエレクトレット化法等が挙げられる。
本発明のエレクトレット化シートは帯電処理によってその表面および内部に電荷を保持することによって吸着力を発現する。表面電荷は除電処理、環境条件(特に相対湿度)、表面の洗浄等によって変動するため、例えば、温度23℃、湿度50%RHの環境下で24時間放置した時の表面電位(静的表面電位)を測定することで吸着力を評価することができる。前記表面電位(静的表面電位)が高くなると吸着力が高くなる傾向がある。なお、前記吸着力は、実施例で後述するように図8に示す吸着力測定装置を用いて測定することもできる。
本発明のフィルターは、前記エレクトレット化シートを立体加工して得るか、または積層体を立体加工したのちに帯電処理して得ることができる。またフィルターの中に帯電処理をしていないシートが含まれていてもよい。ここで、立体加工後の帯電処理は、帯電処理方法のうちバッチ式の方法を応用すればよいため、ここではエレクトレット化シートを立体加工して得られるフィルターについて説明する。
フィルターは、エレクトレット化シートを用いて空気の流路を形成したものである。その立体構造は特に限定されないが、例えば、カードボード構造、ハニカム構造、トラス構造、ピラー構造、及びリブ構造等が挙げられる。
フィルターにおける空気の流路断面率とは、フィルターの断面に対して空気の流路が占める割合である。したがって、その値が低いほど、フィルターの強度が増加すると同時に、空気の流通に対する抵抗となり圧力損失が増加する傾向がある。空気の流路断面率は、フィルターの断面積から、シート基材厚みと流路成形に使用したシート基材の長さの積であるシート基材の断面積を除したものである。またこの値は断面の画像観察から求めることもできる。
(厚み)
積層体全層およびエレクトレット化シートの厚みは、JIS K7130:1999に準拠し、定圧厚さ測定器((株)テクロック製、製品名:PG−01J)を用いて測定した。
表面層、裏面層、接着剤層、高誘電体層各々層の厚みは、測定対象試料を液体窒素にて−60℃以下の温度に冷却し、ガラス板上に置いた試料に対してカミソリ刃(シック・ジャパン(株)製、製品名:プロラインブレード)を直角に当て切断して断面観察用の試料を作成し、得られた試料を走査型電子顕微鏡(日本電子(株)製、製品名:JSM−6490)を使用して断面観察を行い、組成観察像から層間の境界線を判別して、観察される層厚み比率を求め、さらに、この層厚み比率に積層体全層およびエレクトレット化シートの厚みを乗算して求めた。
各製造例で得た表面層材料または裏面層材料の一方の面に、導電性塗料((株)藤倉化成製、製品名:ドータイトD−500)を直径70mmの円となるようにスクリーン印刷し、常温で24時間以上硬化させて主電極を形成し、次いで反対側の面に、同導電性塗料を直径100mmの同心円となるようにスクリーン印刷し、常温で24時間以上硬化させて対電極を形成して、試料を得た。
また、各調整例で得た接着剤層用組成物または高誘電体層用組成物を金属アルミニウムシート上に、塗工量50g/m2となるように当該塗料をアプケーターで塗工し、40℃で1分間乾燥した後に、塗工面にもう1枚の金属アルミニウムシートを重ね、ロールで圧接して、10cm四方に切り出し、温度23℃、相対湿度50%の環境条件下で1日調湿して試料を得た。
静電容量の測定装置としては、インピーダンスアナライザ(Keysight Technologies社製、製品名:E4990A)を使用した。温度23℃、相対湿度50%の環境条件下で各エレクトレット化シートに1Vの電圧を印加し、20Hz〜1MHzの範囲の周波数で静電容量を測定し、周波数100kHzでの静電容量(Cx)を代表値として測定した。次いで同値と別途測定した厚みを用いて、以下の式により比誘電率を計算により求めた。
εr = Cx × h /(ε0 × A)
εr: エレクトレット化シートの各層の比誘電率(−)
Cx: エレクトレット化シートの各層の静電容量(pF)
h : エレクトレット化シートの各層の厚み(m)
ε0: 真空の誘電率=8.854(pF/m)
A : 主電極の面積=3.848×10−4(m2)
各製造例で得た表面層及び裏面層の水蒸気透過係数はJIS−Z−0208に準拠して、カップ法により、40℃、90%RHにて測定した。得られた透湿度(g/(m2・24hr))とフィルムの厚み(mm)とから、水蒸気透過係数(g・mm/(m2・24hr))を求めた。
アルミ板をアースとして、表面電位計(春日電機(株)製、製品名:KSD−3000)のプローブと紙面との間隔が1cmとなるようにして、表面電位を5点測定し、その平均を値とした。以下、測定条件を示す。
電荷注入直後の電位EA:バッチ式帯電装置で帯電させた直後の試料を、除電ブラシを用いて表面の電荷を除去し、直ちに前記アルミ板上に乗せ、表面電位を測定した。
洗浄0.5時間後の表面電位E0.5:容器に溜めたイオン交換水中にサンプルを浸漬して1分間静置し、サンプルを取り出してティッシュで余分な水をふき取り、温度23℃、相対湿度50%の条件下で0.5時間吊るして乾燥させた試料を前記アルミ板上に乗せ、表面電位を測定した。
洗浄24時間後の表面電位E24:洗浄0.5時間後の表面電位を測定したサンプルを再び温度23℃、相対湿度50%の条件下で23.5時間吊るした試料を前記アルミ板上に乗せ、表面電位を測定した。
各実施例及び比較例で得たエレクトレット化シートを、図8に示すように200mm×220mmのサイズに断裁し、温度23℃、相対湿度50%の環境下で24時間保管した後、同環境下で、図8に概略図を示す吸着力測定装置のガラス板52上に、エレクトレット化シート51を吸着面積が200mm×200mmとなり、下端20mm幅分がはみ出す様に貼り付け、エレクトレット化シート51の下端分にクリップ54を取り付け、釣り糸55を取り付けた10gの分銅56を1つずつクリップ54に追加していき、エレクトレット化シート51がガラス板52から滑り落ちた時の分銅56の重さから、吸着力を平米当りに換算して求めた。
(P−1)
ポリエチレングリコールモノメタクリレート(日本油脂(株)製、製品名:ブレンマーPE−350)100重量部、過塩素酸リチウム(和光純薬工業(株)製、試薬)20重量部、ヒドロキノン(和光純薬工業(株)製、試薬)1重量部およびプロピレングリコールモノエチルエーテル(和光純薬工業(株)製、試薬)400重量部を、攪拌装置、還流冷却管(コンデンサー)、温度計、及び滴下ロートを装着した四つ口フラスコに導入し、系内を窒素置換し、60℃で40時間反応させた。これにステアリルメタクリレート(和光純薬工業(株)製、試薬)5重量部、n−ブチルメタクリレート(和光純薬工業(株)製、試薬)5重量部、アゾビスイソブチロニトリル(和光純薬工業(株)製、試薬)1重量部を添加し、80℃で3時間重合反応した後、プロピレングリコールモノエチルエーテルを添加して固形分を20重量%に調整し、重量平均分子量約30万、固形分中のリチウム濃度0.6重量%のアルカリ金属塩含有ポリマー(ポリエチレンオキシド)よりなる帯電防止機能を有するポリマーの溶液(略号P−1)を得た。
(P−2)
環流冷却器、温度計、窒素置換用ガラス管、及び撹拌装置を取り付けた4つ口フラスコに、ジメチルアミノエチルメタクリレート35質量部、エチルメタアクリレート20質量部、シクロヘキシルメタアクリレート20質量部、ステアリルメタアクリレート25質量部、エチルアルコール150質量部、アゾビスイソブチロニトリル1質量部を添加し、窒素気流下、80℃で6時間重合反応を行った。
次いで、3−クロロ−2−ヒドロキシプロピルアンモニウムクロリドの60質量%溶液70質量部を加え、更に80℃で15時間反応させた後、水を滴下しながらエチルアルコールを留去し、固形分濃度30質量%の第四級アンモニウム塩型共重合体(略号P−2)を得た。
(P−3)
ポリエチレンイミン(日本触媒製、製品名:エポミンP−1000、固形分濃度100質量%、略号P−3)をそのまま用いた。
(P−4)
アクリル酸エステル系共重合体(東亞合成(株)製、製品名:アロンタックS−1511X、固形分濃度40質量%、略号P−4)をそのまま用いた。
ヘキサメチレンジイソシアネート(東ソー製(株)、製品名:HDI)をそのまま用いた。
[接着剤層・高誘電体層用組成物の調製]
高分子バインダーP−4を酢酸エチルで固形分濃度30質量%に希釈し、撹拌しながら5分間かけて硬化剤を滴下した。下記表1に示すように、P−4と硬化剤との固形分比は1:1とした。
(調整例2:高誘電体層用組成物)
高分子バインダーP−4を酢酸エチルで固形分濃度25質量%に希釈し、撹拌しながら帯電防止機能を有するポリマーP−1を添加した後、15分間撹拌を継続した。次に、撹拌しながら5分間かけて硬化剤を滴下したのち、酢酸エチルで固形分濃度を20質量%に調整した。下記表1に示すように、P−1、P−4、硬化剤の固形分比は15:42.5:42.5とした。
(調整例3:高誘電体層用組成物)
イオン交換水を撹拌しながら、帯電防止機能を有するポリマーP−2を添加し、5分間撹拌した。次に高分子バインダーP−3を添加したのち、15分間撹拌を継続した。次にイオン交換水で固形分濃度を1.5質量%に調整した。下記表1に示すように、P−2とP−3との固形分比は1:4とした。
(調整例4:高誘電体層用組成物)
下記表1に示すように、帯電防止機能を有するポリマーP−1をそのまま用いた。
(製造例1)
市販の2軸延伸ポリプロピレンフィルム(東洋紡(株)製、製品名:OT−P2108、厚み:40μm)をそのまま使用した。本品には片面にコロナ放電処理が行われているが、帯電防止処理は行われていない。
(製造例2)
市販の2軸延伸ポリプロピレンフィルム(東洋紡(株)製、製品名:OT−P2102、厚み:20μm)をそのまま使用した。本品には片面にコロナ放電処理が行われているが、帯電防止処理は行われていない。
(製造例3)
プロピレン単独重合体(日本ポリプロ(株)製、製品名:ノバテックPP FY4)70質量%、高密度ポリエチレン(日本ポリエチレン(株)製、製品名:ノバテックHD HJ360)10質量%、重質炭酸カルシウム(備北粉化工業(株)製、製品名:ソフトン1800)20質量%とからなる熱可塑性樹脂組成物aを230℃に設定した押出機にて溶融混練した後、250℃に設定した押出ダイに供給しシート状に押し出し、これを冷却装置により60℃まで冷却して無延伸シートを得た。
この無延伸シートを135℃に加熱し、ロール群の周速差を利用して縦方向に5倍延伸した。
次に、プロピレン単独重合体(日本ポリプロ(株)製、製品名:ノバテックPP MA3)45質量%、高密度ポリエチレン(日本ポリエチレン(株)製、製品名:ノバテックHD HJ360)10質量%、重質炭酸カルシウム(備北粉化工業(株)製、製品名:ソフトン1800)45質量%とからなる樹脂組成物bを250℃に設定した2台の押出機にて溶融混練した後、シート状に押し出して前記5倍延伸シートの両面にそれぞれに積層し、3層構造の積層シートを得た。
次いで、この積層シートを60℃まで冷却し、テンターオーブンを用いて再び約150℃に加熱して横方向に8.5倍延伸した後、更に160℃まで加熱して熱処理を行った。
次いで60℃に冷却し、耳部をスリットした後、この積層シートの両面にコロナ放電による表面処理を施し、厚みが80μm、3層構造〔各層樹脂組成(b/a/b)、各層厚み(25μm/30μm/25μm)、各層延伸軸数(1軸/2軸/1軸)〕の熱可塑性樹脂フィルムを得た。
図6に概略図を示すエレクトレット化シート製造装置を用い、実施例1〜3および比較例1で得られた積層体をロール(21)より巻きだし、直流高圧電源(23)に接続した針状印加電極(24)とロール状アース電極(25)間で直流式のコロナ放電による電荷注入処理を実施して、これを巻き取り、各実施例および比較例のエレクトレット化シート(22)を得た。電荷注入処理の条件としては、図6中の針状印加電極(24)とロール状アース電極(25)間の距離を1cmに設定し、表3に記載の印加電圧を用いた。
続いて、この積層体を前記の帯電処理方法で処理し、表2に示す構成の比較例1のエレクトレット化シートを得た。
続いて、この積層体を前記の帯電処理方法で処理し、表2に示す構成の実施例1のエレクトレット化シートを得た。
次に、前記調整例3の高誘電体層用組成物の塗工面に調整例1の接着剤層用組成物を乾燥後の厚みが10μmとなるように塗工し、乾燥しながら、表面層となる製造例2の熱可塑性樹脂フィルムを貼合して圧着して、製造例2の熱可塑性樹脂フィルム(表面層)/調整例1の接着剤層用組成物/調整例3の高誘電体層用組成物/製造例3の熱可塑性樹脂フィルム(裏面層)の積層体を得た。
続いて、この積層体を前記の帯電処理方法で処理し、表2に示す構成の実施例2のエレクトレット化シートを得た。
続いて、この積層体を前記の帯電処理方法で処理し、表2に示す構成の実施例3のエレクトレット化シートを得た。
実施例1のエレクトレット化シートを紙製段ボールの製造に使用するシングルフェーサーに供給し、山高さ3mm、ピッチ3mmのフルートとなる様にコルゲート加工し、別途、実施例1のエレクトレット化シートをライナーとして供給し、フルートの頂上部分に感圧接着剤を塗工して片面段を作成した。
作成した片面段のもう一方のフルートの頂上部に接着剤を塗工し、別に作成した片面段を片面段同士が同方向になる様に(フルートとライナーが交互に積層する様に)積層してゆき、図7に図示する実施例1のエレクトレットフィルターを得た。
同様にして比較例1のエレクトレット化シートをフルートおよびライナーとして使用した比較例1のフィルターを作成した。
また、洗浄後の表面電位が高いエレクトレット化シートを加工して得られるフィルターは、洗浄後の集塵能力の回復率が高いと考えられる。
2a 表面層
2b 裏面層
2c 中間層
3 高誘電体層
3a 第1の高誘電体層
3b 第2の高誘電体層
4a 第1の接着剤層
4b 第2の接着剤層
11 熱可塑性樹脂フィルム
12 直流高圧電源
13 針状印加電極
14 板状アース電極(面状配列)
15 針状印加電極
16 ロール状アース電極
21 積層体のロール
22 エレクトレット化シート
23 直流高圧電源
24 針状印加電極(横一列配置)
25 ロール状アース電極
26 ガイドロール(グランドアース接続)
27 ニップロール
28 ニップロール
38 評価用フィルター
51 エレクトレット化シート
52 ガラス板
53 支柱
54 クリップ
55 釣り糸
56 分銅
Claims (7)
- 表面層、高誘電体層、および裏面層を少なくとも含み、前記表面層と前記裏面層との間に前記高誘電体層を有するフィルター用エレクトレット化シートであって、
前記表面層および前記裏面層はそれぞれ100kHzにおける比誘電率が6未満の熱可塑性樹脂フィルムであり、
前記高誘電体層は100kHzにおける比誘電率が6以上の材料であり、
前記表面層および前記裏面層は帯電処理による静電気を有していることを特徴とする、
フィルター用エレクトレット化シート。 - 前記高誘電体層が、比誘電率が10〜30の4級アンモニウム塩型構造を有する水溶性ポリマーを含む、請求項1に記載のエレクトレット化シート。
- 前記表面層及び裏面層がポリオレフィン系樹脂フィルムである、請求項1または2に記載のエレクトレット化シート。
- 温度15℃の条件でイオン交換水に1分浸漬して引上げ、水をふき取り、温度23℃、湿度50%RHの環境下で24時間放置した時の表面電位(洗浄24時間後表面電位E24)が、0.2kV以上5kV以下である、請求項1〜3のいずれか1項に記載のエレクトレット化シート。
- 温度15℃の条件でイオン交換水に1分浸漬して引上げ、水をふき取り、温度23℃、湿度50%RHの環境下で24時間放置した時の表面電位を洗浄24時間後表面電位E24とし、温度15℃の条件でイオン交換水に1分浸漬して引上げ、水をふき取り、温度23℃、湿度50%RHの環境下で30分間放置した時の表面電位を洗浄0.5時間後表面電位E0.5としたとき、前記洗浄24時間後表面電位と洗浄0.5時間後表面電位との差(E24−E0.5)が0.1kV以上5kV以下である、請求項1〜4のいずれか1項に記載のエレクトレット化シート。
- 請求項1〜5のいずれか1項に記載のエレクトレット化シートを用いて空気の流路を形成したフィルター。
- 空気の流路断面率が10%以上99%以下である、請求項6に記載のフィルター。
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US10898843B2 (en) * | 2017-01-25 | 2021-01-26 | Samuel Stephen Grimes | Reusable air filter |
CN111801460A (zh) * | 2018-03-09 | 2020-10-20 | 东丽株式会社 | 防静电粉尘防护布料和使用它的防护服 |
JP7216926B2 (ja) * | 2019-01-09 | 2023-02-02 | 王子ホールディングス株式会社 | コルゲートハニカム構造物及びコルゲートハニカム積層物の製造方法 |
JP7453797B2 (ja) * | 2020-01-24 | 2024-03-21 | キヤノン株式会社 | 静電フィルター用ユニット及び静電フィルター |
CN111330355B (zh) * | 2020-02-28 | 2022-06-14 | 厦门理工学院 | 一种驻极纳米纤维高效过滤材料及其制备方法 |
CN111495035B (zh) * | 2020-02-28 | 2022-09-06 | 中科贝思达(厦门)环保科技股份有限公司 | 一种驻极纳米纤维空气过滤材料及其制备方法 |
CN111249805B (zh) * | 2020-02-28 | 2022-07-12 | 厦门理工学院 | 一种驻极纳米纤维过滤材料及其制备方法 |
CN111682099B (zh) * | 2020-06-01 | 2022-01-07 | 华中科技大学 | 一种柔性聚合物压电薄膜及其制备方法 |
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CN114919247A (zh) * | 2022-05-10 | 2022-08-19 | 浙江师范大学 | 一种层状复合薄膜及其制备方法、应用 |
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