JP3960440B2 - Filter paper for air cleaning filter, manufacturing method thereof, and air cleaning filter using the filter paper - Google Patents
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 27
- 239000000853 adhesive Substances 0.000 claims description 24
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 238000001179 sorption measurement Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 7
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- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 5
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- -1 polyethylene terephthalate Polymers 0.000 description 2
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
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Description
【０００１】
【発明の属する技術分野】
本発明は、空気清浄フィルター用濾紙、その製造方法およびその濾紙を用いた空気清浄フィルターに関し、更に詳しくはクリーンルーム等に用いられる高性能空気浄化用フィルター用濾紙、その製造方法及びその濾紙を用いた空気清浄フィルターに関する。
【０００２】
【従来の技術】
従来、クリーンルーム、クリーンベンチ、無菌室などの高度な清浄環境を要求されている超微粉塵などを除去する必要のある分野に、ガラス繊維製のいわゆる「高性能空気清浄フィルター用濾紙」が用いられている。該「高性能空気清浄フィルター用濾紙」は、ＭＩＬ−ＳＴＤ ＭＩＬ−Ｆ−５１０７９Ｃに規定されており、０．３μｍのフタル酸ジオクチル粒子（略語：ＤＯＰ粒子）の捕集効率が面風速５．３３ｃｍ／秒の条件下で９９．９７％以上の性質を示し、通常ＨＥＰＡ（High Efficiency Particulate Air filter) と呼ばれているガラス繊維濾紙であると規定されている。
【０００３】
特開平４−２８４８０３号公報には、従来のＨＥＰＡ用ガラス繊維濾紙の捕集効率を維持し、且つ従来のＨＥＰＡ用ガラス繊維濾紙の圧力損失が高いという欠点を改良した高性能空気清浄フィルター用濾紙が示されている。該公報に記載の高性能空気清浄フィルター用濾紙は、ガラス繊維の組成が、１０〜５０重量％の繊維径１０μｍ以下のガラスチョップドストランド繊維、及び９０〜５０重量％の極細ガラス繊維からなり、上記ＨＥＰＡの特性を有し且つ圧力損失の少ないガラス繊維濾紙である。しかしながら、前記従来の「高性能空気浄化用フィルター濾紙」（ＨＥＰＡ）は除塵機能を有しているが脱臭機能は無いという問題があった。
【０００４】
一方、特開平２−１１５０１３号公報には、活性炭素繊維を４０〜７０重量％、ガラス繊維を２０〜４０重量％、接着剤を１〜４重量％含有させて混抄することにより、従来の中性能空気浄化用フィルター濾紙と同様の除塵機能を有し、圧力損失が小さく、且つ脱臭機能を付与した中性能フィルター用濾紙を得たことが示されている。しかしながら、該公報の空気浄化用フィルター濾紙は中性能であり、超微粉塵などの捕集効率が高性能空気浄化用フィルター濾紙に比べて低いという問題があった。
【０００５】
また、特開平７−２８９８２８号公報には、活性炭素繊維を１０〜４０重量％、平均繊維径２〜３μｍのガラス繊維を１０重量％以上、接着剤を４〜６重量％含有させて混抄することにより、引っ張り強度を確保でき、圧力損失を低く抑えることができ、且つ脱臭機能を付与した中性能フィルター用濾紙を得たことが示されている。しかしながら、該公報の空気浄化用フィルター濾紙は中性能であり、超微粉塵などの捕集効率が高性能空気浄化用フィルター濾紙に比べて低いという問題があった。
【０００６】
【発明が解決しようとする課題】
そこで本発明は、ＭＩＬ−ＳＴＤ ＭＩＬ−Ｆ−５１０７９Ｃに規定される「高性能空気浄化用フィルター濾紙」（ＨＥＰＡ）の除塵性能を有し且つ脱臭等の吸着機能を付与した、空気清浄フィルター用濾紙、その製造方法及びその濾紙を用いた空気清浄フィルターを提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記した問題点を解決するために、本発明の空気清浄フィルター用濾紙は、
（１）平均繊維径０．３μｍ以上２．０μｍ未満のガラス繊維１００重量部に対して、
（２）比表面積５００〜１３００ｍ2 ／ｇ、繊維径５μｍ以上１５μｍ未満、繊維長１〜２０ｍｍの活性炭素繊維を５〜４０重量部、及び
（３）接着剤を１〜７重量部
の割合で含ませている。
【０００８】
上記構成のガラス繊維、活性炭素繊維及び接着剤の組み合わせとすることにより、ＭＩＬ−ＳＴＤ ＭＩＬ−Ｆ−５１０７９Ｃに規定される「高性能空気浄化用フィルター濾紙」（ＨＥＰＡ）とすることができ、且つ脱臭性能を付加することができる。即ち、０．３μｍ粒子の捕集効率が９９．９７％以上で、且つトルエンの吸着能が１％以上の空気清浄フィルター用濾紙とすることができる。
【０００９】
本発明の空気清浄フィルター用濾紙に使用されるガラス繊維は、平均繊維径０．３〜２．０μｍのマイクロファイバーを含むことが「高性能空気浄化用フィルター濾紙」とするためには重要な要件である。しかしながら、ガラス繊維全体の平均径が０．３〜２．０μｍの範囲であるならば、濾紙の強度付与のため、太径のチョップドストランドガラス繊維を数％配合しても構わない。濾紙の捕集性能は圧力損失と捕集効率によって決定され、圧力損失が高いほど捕集効率の高い濾紙となるが、圧力損失が高くなるとフィルターを運転する送風機の負荷が高くなりエネルギーコストがかかるので好ましくない。通常、使用目的に合わせた濾材設計を行うために、ガラス繊維の平均繊維径が決定される。ガラス繊維の平均繊維径２．０μｍ以上では捕集効率９９．９７％未満となり、ＨＥＰＡとしての捕集性能が満たせず、逆に０．３μｍ以下では圧力損失が高くなりすぎて好ましくはない。
【００１０】
本発明の空気清浄フィルター用濾紙において、活性炭素繊維の径を５μｍ以上１５μｍ未満と限定した理由は、５μｍ未満だと活性炭素繊維の製造が困難となり、また１５μｍを超えると得られた濾紙の加工性が悪くなり、フィルター製作時のプリーツ加工が困難となるからである。
【００１１】
本発明の空気清浄フィルター用濾紙において、活性炭素繊維の比表面積を５００〜１３００ｍ2 ／ｇとした理由は、５００ｍ2 ／ｇ未満だと脱臭性能等の吸着性能が十分ではなく、また１３００ｍ2 ／ｇを超えると、活性炭素繊維の強度が不十分となり、取り扱い性が悪くなる。
【００１２】
本発明の空気清浄フィルター用濾紙において、活性炭素繊維の繊維長を１ｍｍ〜２０ｍｍとする理由は、１ｍｍ未満にすることは困難で、価格が高くなり、工業的に不適であるからであり、また２０ｍｍを超えると活性炭素繊維の水分散性が悪くなり、均一な濾紙を得ることが困難となるからである。
【００１３】
本発明の空気清浄フィルター用濾紙において、相対湿度３７％における活性炭素繊維の平衡水分率を１０％以上とする理由は、１０％未満では、湿式抄紙時に分散性が悪く、均一な濾紙を得ることが困難となるからである。
【００１４】
極細ガラス繊維を使用した空気清浄フィルター用濾紙において捕集性能は、濾紙を構成するガラス繊維の充填ばらつきに影響されることが経験的に分かっている。すなわち、充填のばらつきが大きければ、これに伴ってガラス繊維相互により形成される細孔のばらつきが大きくなり、最大径が大きくなり、そのため捕集効率が低下することになり、ＨＥＰＡとはならない。したがって、本発明においては、極細ガラス繊維に対して添加する活性炭素繊維を均一に分散させることは、捕集効率を低下させないために重要な要件である。
【００１５】
本発明に使用される活性炭素繊維（ＡＣＦ）は、ポリアクリロニトリル系繊維、セルロース系繊維、フェノール系繊維、ピッチ系繊維を原料として既知の方法で賦活してつくられる比表面積５００〜１３００ｍ2 ／ｇの繊維状活性炭である。これらの活性炭素繊維の中でも、特に、ポリアクリロニトリル系活性炭素繊維は、水分散性において特に優れており、均一に分布した濾紙となるので、極細ガラス繊維の除塵機能を損なうことが無い。また、湿式抄紙時に分散性が良いので、ダマとならず、活性炭素繊維自体の吸着性能を損なうことはない。
【００１６】
本発明に使用される活性炭素繊維は、上記各特性を併せ持つことが、捕集性能が良好なＨＥＰＡとする上で重要である。特に、活性炭素繊維の分散性は、捕集性能に大いに影響を与え、分散不良だと、活性炭素繊維の塊部分よりリークが発生し、ＨＥＰＡとしての除塵性能を達成することができない。
【００１７】
本発明の空気清浄フィルター用濾紙において、接着剤（バインダー）としては、アクリル系、酢ビ系、ウレタン系、エポキシ系、ポリエステル系、ＳＢＲ系、ＮＢＲ系ラテックス或いはポリビニルアルコール、澱粉などの製紙工程で一般的に用いられる紙力剤、或いは湿熱溶融タイプのポリビニルアルコール繊維状バインダー、鞘部に低融点のポリエチレンテレフタレート、変成ポリプロピレン、変成ポリエステルを用いた芯鞘繊維などの繊維状バインダー等が、単独或いは組み合わせて用いられる。また、濾紙に撥水性を付与するため、シリコン系、フッ素系、パラフィン系等の撥水剤を併用しても良い。
【００１８】
接着剤の添加量については、平均繊維径０．３μｍ以上２．０μｍ未満のガラス繊維を１００重量部に対して、１〜７重量部が望ましく、１重量部以下では濾紙に十分な実用強度が付与できず、７重量部以上では濾紙の構成繊維間に接着剤の水かき状態が増えるため、圧力損失が高くなりすぎて好ましくない。
【００１９】
本発明の空気清浄フィルター用濾紙の第一番目の製造方法は、平均繊維径０．３μｍ以上２．０μｍ未満のガラス繊維１００重量部に対して比表面積５００〜１３００ｍ2 ／ｇ、繊維径５μｍ以上１５μｍ未満、繊維長１〜２０ｍｍの活性炭素繊維を５〜４０重量部、接着剤を１〜７重量部の割合で含む水懸濁液を湿式にて抄紙した後、乾燥することを特徴とする。
【００２０】
本発明の空気清浄フィルター用濾紙の第二番目の製造方法は、平均繊維径０．３μｍ以上２．０μｍ未満のガラス繊維１００重量部に対して比表面積５００〜１３００ｍ2 ／ｇ、繊維径５μｍ以上１５μｍ未満、繊維長１〜２０ｍｍの活性炭素繊維を５〜４０重量部の割合で含む水懸濁液を湿式にて抄紙した湿紙に接着剤１〜７重量部を付着させ、その後に乾燥することを特徴とする。
【００２１】
すなわち、本発明の空気清浄フィルター用濾紙は、前記濾紙構成繊維をパルパーなどを用いて水中に分散させ、このスラリーを抄紙機で湿式抄紙して湿紙を得て、その後乾燥させる方法である。原料繊維の分散工程では分散性を良くするために、硫酸酸性でｐＨ２〜４の範囲で調整する方法をとるが、ｐＨ中性で分散剤等の界面活性剤を使用しても良い。
【００２２】
また接着剤の付与方法としては、接着剤を分散時に配合する内添法と、抄紙機により得られ湿紙に接着剤を付着させその後乾燥させる外添法とがあり、いずれの方法を採用しても本発明の効果に変わりはなく、接着剤のトータル量が１重量部以上７重量部以下であるならば、内添法と外添法を併用しても良い。外添法での付与方法としては特に限定されるものではないが、湿紙を付着液に浸漬する方法、湿紙にスプレーで吹き付ける方法、ロールに付着液を付着させ湿紙に転写する方法などが用いられる。
【００２３】
乾燥方法としては、熱風乾燥機、ロールドライヤーなどを利用し、１１０〜１５０℃で乾燥することが望ましい。
【００２４】
【実施例】
以下の各実施例で用いた試験法は次のようにして行った。
【００２５】
圧力損失
有効面積１００ｃｍ2 の濾紙に面風速５．３３ｃｍ／秒で空気を通過させ、そのときの差圧を微差圧計で測定した。
【００２６】
ＤＯＰ捕集効率
ラスキンノズルで発生させた多分散ＤＯＰ粒子を含む空気を、有効面積１００ｃｍ2 の濾紙に面風速５．３３ｃｍ／秒で通風した時のＤＯＰ捕集効率をリオン社製レーザーパーティクルカウンターにて測定した。尚、対象粒径は０．３μｍで測定した。
【００２７】
ＰＦ値
濾材の濾過性能の指標となるＰＦ値は、上記圧力損失と捕集効率の測定値に基づき次式より求めた。（ＰＦ値の高い方が同一圧力損失で高捕集効率を示す。）
【００２８】
【数１】
引張強度
濾紙の縦方向より１インチ巾にカットした試験片をスパン長１００ｍｍ、引張速度１５ｍｍ／分で定速引張試験機を用い測定した。
【００３０】
トルエン吸着能
１ｇのサンプルを１０５℃で１時間乾燥後、ＪＩＳ−Ｋ １４７７−９５に準拠してトルエン吸着能を測定した。
【００３１】
平衡水分率
２５℃、ＲＨ３７％にて、ＪＩＳに準拠して測定した。
【００３２】
活性炭素繊維の分散性
濾紙における活性炭素繊維の分散性は、目視にて、分散性が良好なものを〇、ダマが明らかに確認され分散性が悪いものを×、分散性がいずれともいえないものを△の評価で示した。
【００３３】
〔実施例１〕
平均繊維径１．４１μｍのガラス繊維１００重量部に対して、比表面積７５０ｍ2 ／ｇ、繊維径１２μｍ、繊維長５ｍｍ、平衡水分率（ＲＨ３７％下）１６％のＰＡＮ系ＡＣＦ（商品名：ファインガード、製造元：東邦レーヨン（株））１１重量部を配合し、濃度０．５％、硫酸酸性ｐＨ３．５でパルパーで離解し、次いで抄紙機にて抄紙して湿紙を得た。次いで、接着剤組成としてアクリル系ラテックス（商品名：プライマルＥ−３５８、製造元：日本アクリル化学）１．８５重量部、フッ素系撥水剤（商品名：ライトガードＦＲＧ−１、製造元：共栄社化学）０．１６重量部の接着剤を外添法により湿紙に付与し、その後１３０℃のロールドライヤーで乾燥し、目付７０ｇ／ｍ2 、接着剤付着量６．２重量部の濾紙を得た。
【００３４】
得られた濾紙の圧力損失、捕集効率、ＰＦ値、引張強度、トルエン吸着能を測定し、その結果を下記の表１に示す。
【００３５】
〔実施例２〕
平均繊維径１．２５μｍのガラス繊維１００重量部に対して、比表面積９００ｍ2 ／ｇ、繊維径１０μｍ、繊維長８ｍｍ、平衡水分率１３％（ＲＨ３７％下）のＰＡＮ系ＡＣＦ（商品名：ファインガード、製造元：東邦レーヨン（株））２５重量部を配合した以外は、前記実施例１と同様にして目付７０ｇ／ｍ2 、接着剤付着量６．２重量部の濾紙を得た。
【００３６】
得られた濾紙の圧力損失、捕集効率、ＰＦ値、引張強度、トルエン吸着能を測定し、その結果を下記の表１に示す。
【００３７】
〔実施例３〕
平均繊維径１．４１μｍのガラス繊維１００重量部に対して、比表面積８００ｍ2 ／ｇ、繊維径１２μｍ、繊維長１０ｍｍ、平衡水分率１４％（ＲＨ３７％下）のＰＡＮ系ＡＣＦ（商品名：ファインガード、製造元：東邦レーヨン（株））１１重量部、内添系接着剤として湿熱溶解タイプのポリビニルアルコール繊維状バインダー（商品名：ＶＰＢ１０７−２、製造元：クラレ（株））３．３重量部を配合し、濃度０．５％、硫酸酸性ｐＨ３．５でパルパーで離解し、次いで抄紙機にて抄紙して湿紙を得た。次いで、液濃度０．０１４重量％のフッ素系撥水剤を外添法により湿紙に付与し、その後１３０℃のロールドライヤーで乾燥し、目付７０ｇ／ｍ2 、接着剤付着量３．０重量部の濾紙を得た。
【００３８】
得られた濾紙の圧力損失、捕集効率、ＰＦ値、引張強度、トルエン吸着能を測定し、その結果を下記の表１に示す。
【００３９】
〔実施例４〕
平均繊維径１．２５μｍのガラス繊維１００重量部に対して、比表面積１０００ｍ2 ／ｇ、繊維径１０μｍ、繊維長７ｍｍ、平衡水分率１２％のＰＡＮ系ＡＣＦ（商品名：ファインガード、製造元：東邦レーヨン（株））２５重量部を配合した以外は、前記実施例３と同様にして接着剤付着量３．０重量部の濾紙を得た。
【００４０】
得られた濾紙の圧力損失、捕集効率、ＰＦ値、引張強度、トルエン吸着能を測定し、その結果を下記の表１に示す。
【００４１】
〔比較例〕
平均繊維径１．４１μｍのガラス繊維１００重量部に対して、比表面積１０００ｍ2 ／ｇ、繊維径１８μｍ、繊維長５ｍｍ、平衡水分率５％（ＲＨ３７％下）のピッチ系活性炭素繊維（商品名：リノベス、製造元：大阪ガス（株））１１重量部を配合した以外は前記実施例１と同様にして目付７０ｇ／ｍ2 、接着剤付着量６．２重量部の濾紙を得た。
【００４２】
得られた濾紙の圧力損失、捕集効率、ＰＦ値、引張強度、トルエン吸着能を測定し、その結果を下記の表１に示す。
【００４３】
【表１】
表１によれば、繊維径が１５μｍ以上の、平衡水分率が１０％未満の活性炭素繊維を使用したピッチ系活性炭素繊維を使用した濾紙は、分散性が悪く、捕集効率が低く、脱臭成分等の吸着率が低いのに対して、本発明の空気清浄フィルター用濾紙は、活性炭素繊維の分散性がよく、従って、捕集効率が高く、脱臭成分等の吸着率が高いことが分かる。
【００４５】
【発明の効果】
本発明の空気清浄フィルター用濾紙は、ＭＩＬ−ＳＴＤ ＭＩＬ−Ｆ−５１０７９Ｃに規定される「高性能空気浄化用フィルター濾紙」（ＨＥＰＡ）の除塵性能と脱臭等の吸着機能を同時に有する。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter paper for an air cleaning filter, a manufacturing method thereof, and an air cleaning filter using the filter paper. More specifically, a filter paper for a high performance air cleaning filter used in a clean room or the like, a manufacturing method thereof, and the filter paper thereof are used. It relates to an air cleaning filter.
[0002]
[Prior art]
Conventionally, so-called “filter paper for high-performance air cleaning filters” made of glass fiber has been used in fields where it is necessary to remove ultra-fine dust, etc. that require a highly clean environment such as clean rooms, clean benches, and aseptic rooms. ing. The “filter paper for high-performance air cleaning filter” is defined in MIL-STD MIL-F-51079C, and the trapping efficiency of 0.3 μm dioctyl phthalate particles (abbreviation: DOP particles) is 5.33 cm. It is specified to be a glass fiber filter that exhibits a property of 99.97% or more under the condition of / sec and is generally called HEPA (High Efficiency Particulate Air filter).
[0003]
Japanese Patent Application Laid-Open No. 4-284803 discloses a filter paper for a high-performance air cleaning filter that maintains the collection efficiency of the conventional glass fiber filter paper for HEPA and has improved the disadvantage of high pressure loss of the conventional glass fiber filter paper for HEPA. It is shown. The filter paper for a high-performance air purifying filter described in the publication is composed of a glass chopped strand fiber having a fiber diameter of 10 to 50% by weight and a fiber diameter of 10 μm or less, and an ultrafine glass fiber of 90 to 50% by weight, It is a glass fiber filter paper having HEPA characteristics and low pressure loss. However, the conventional “high performance air purification filter paper” (HEPA) has a dust removal function but no deodorization function.
[0004]
On the other hand, Japanese Patent Application Laid-Open No. 2-115513 discloses a conventional method by mixing 40 to 70% by weight of activated carbon fiber, 20 to 40% by weight of glass fiber, and 1 to 4% by weight of adhesive. It is shown that a filter paper for medium performance filters having a dust removal function similar to that of a filter paper for performance air purification, a small pressure loss and a deodorizing function is obtained. However, the filter paper for air purification of the publication has a medium performance, and there is a problem that the collection efficiency of ultra fine dust and the like is lower than that of the filter paper for high-performance air purification.
[0005]
In JP-A-7-289828, 10-40% by weight of activated carbon fibers, 10% by weight or more of glass fibers having an average fiber diameter of 2-3 μm, and 4-6% by weight of an adhesive are mixed and mixed. Thus, it is shown that a tensile filter strength can be secured, a pressure loss can be kept low, and a filter paper for medium performance filters having a deodorizing function is obtained. However, the filter paper for air purification of the publication has a medium performance, and there is a problem that the collection efficiency of ultra fine dust and the like is lower than that of the filter paper for high-performance air purification.
[0006]
[Problems to be solved by the invention]
Accordingly, the present invention provides a filter paper for an air cleaning filter having a dust removal performance of “High Performance Air Purification Filter Filter Paper” (HEPA) defined in MIL-STD MIL-F-51079C and having an adsorption function such as deodorization. An object of the present invention is to provide an air purification filter using the manufacturing method and the filter paper.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the filter paper for an air cleaning filter of the present invention is:
(1) For 100 parts by weight of glass fiber having an average fiber diameter of 0.3 μm or more and less than 2.0 μm,
(2) 5 to 40 parts by weight of activated carbon fiber having a specific surface area of 500 to 1300 m 2 / g, fiber diameter of 5 μm to less than 15 μm and fiber length of 1 to 20 mm, and (3) 1 to 7 parts by weight of adhesive. Included.
[0008]
By combining the glass fiber, the activated carbon fiber, and the adhesive having the above-described configuration, it can be a “filter filter paper for high-performance air purification” (HEPA) defined in MIL-STD MIL-F-51079C, and Deodorizing performance can be added. That is, a filter paper for an air cleaning filter having a trapping efficiency of 0.3 μm particles of 99.97% or more and an adsorption capacity of toluene of 1% or more can be obtained.
[0009]
The glass fiber used in the filter paper for the air cleaning filter of the present invention is an important requirement for making a "high performance air cleaning filter paper" containing microfibers having an average fiber diameter of 0.3 to 2.0 μm. It is. However, if the average diameter of the entire glass fiber is in the range of 0.3 to 2.0 μm, a few percent of thick chopped strand glass fibers may be blended to impart filter paper strength. Filter paper collection performance is determined by pressure loss and collection efficiency. The higher the pressure loss, the higher the collection efficiency, but the higher the pressure loss, the higher the load on the fan that drives the filter and the higher the energy cost. Therefore, it is not preferable. Usually, the average fiber diameter of the glass fibers is determined in order to design the filter medium according to the purpose of use. When the average fiber diameter of the glass fiber is 2.0 μm or more, the collection efficiency is less than 99.97%, and the collection performance as HEPA is not satisfied. On the other hand, when the glass fiber is 0.3 μm or less, the pressure loss becomes too high.
[0010]
In the filter paper for an air cleaning filter of the present invention, the reason why the diameter of the activated carbon fiber is limited to 5 μm or more and less than 15 μm is that if it is less than 5 μm, it becomes difficult to produce the activated carbon fiber, and if it exceeds 15 μm, the obtained filter paper is processed. This is because the properties are deteriorated and pleating during production of the filter becomes difficult.
[0011]
The air cleaning filter for filter paper of the present invention, the reason why the specific surface area of the active carbon fibers was 500~1300m 2 / g, the adsorption performance of such deodorizing performance and less than 500 meters 2 / g is not sufficient, also 1300 m 2 / If it exceeds g, the strength of the activated carbon fiber becomes insufficient, and the handleability deteriorates.
[0012]
In the filter paper for an air cleaning filter of the present invention, the reason why the active carbon fiber has a fiber length of 1 mm to 20 mm is because it is difficult to make the fiber length less than 1 mm, the price is high, and it is industrially unsuitable. This is because when the thickness exceeds 20 mm, the water dispersibility of the activated carbon fiber is deteriorated, and it is difficult to obtain a uniform filter paper.
[0013]
In the filter paper for an air cleaning filter of the present invention, the reason why the equilibrium moisture content of the activated carbon fiber at a relative humidity of 37% is 10% or more is that if it is less than 10%, the dispersibility is poor during wet papermaking and a uniform filter paper is obtained. This is because it becomes difficult.
[0014]
It has been empirically found that the collection performance of the filter paper for an air cleaning filter using ultrafine glass fibers is affected by the filling variation of the glass fibers constituting the filter paper. That is, if the variation in filling is large, the variation in pores formed by the glass fibers increases accordingly, and the maximum diameter increases, so that the collection efficiency decreases, and HEPA does not occur. Therefore, in the present invention, uniformly dispersing the activated carbon fiber added to the ultrafine glass fiber is an important requirement in order not to lower the collection efficiency.
[0015]
The activated carbon fiber (ACF) used in the present invention is a specific surface area of 500 to 1300 m 2 / g produced by activating a known method using polyacrylonitrile fiber, cellulose fiber, phenol fiber and pitch fiber as raw materials. It is a fibrous activated carbon. Among these activated carbon fibers, in particular, polyacrylonitrile-based activated carbon fibers are particularly excellent in water dispersibility and become a uniformly distributed filter paper, so that the dust removing function of the ultrafine glass fibers is not impaired. Moreover, since the dispersibility is good at the time of wet papermaking, it does not become lumpy and does not impair the adsorption performance of the activated carbon fiber itself.
[0016]
It is important for the activated carbon fiber used in the present invention to have both of the above characteristics in order to obtain HEPA with good collection performance. In particular, the dispersibility of the activated carbon fiber greatly affects the collection performance. If the dispersion is poor, leakage occurs from the lump portion of the activated carbon fiber, and the dust removal performance as HEPA cannot be achieved.
[0017]
In the filter paper for an air cleaning filter of the present invention, as an adhesive (binder), an acrylic, vinyl acetate, urethane, epoxy, polyester, SBR, NBR latex, polyvinyl alcohol, starch, or other papermaking process is used. Commonly used paper strength agents, wet heat melting type polyvinyl alcohol fibrous binders, low-melting point polyethylene terephthalate in the sheath, modified polypropylene, fibrous binders such as core-sheath fibers using modified polyester, etc. Used in combination. Further, in order to impart water repellency to the filter paper, a water-repellent agent such as silicon, fluorine, or paraffin may be used in combination.
[0018]
The amount of the adhesive added is preferably 1 to 7 parts by weight with respect to 100 parts by weight of glass fiber having an average fiber diameter of 0.3 μm or more and less than 2.0 μm, and if it is 1 part by weight or less, the filter paper has sufficient practical strength. If it is 7 parts by weight or more, the amount of webbed adhesive is increased between the constituent fibers of the filter paper, which is not preferable because the pressure loss becomes too high.
[0019]
The first method for producing the filter paper for an air cleaning filter of the present invention is a specific surface area of 500 to 1300 m 2 / g and a fiber diameter of 5 μm or more with respect to 100 parts by weight of glass fibers having an average fiber diameter of 0.3 μm or more and less than 2.0 μm. It is characterized in that an aqueous suspension containing 5 to 40 parts by weight of activated carbon fiber having a fiber length of less than 15 μm and a fiber length of 1 to 20 mm and an adhesive in a proportion of 1 to 7 parts by weight is made by paper and then dried. .
[0020]
The second production method of the filter paper for an air cleaning filter of the present invention is a specific surface area of 500 to 1300 m 2 / g and a fiber diameter of 5 μm or more with respect to 100 parts by weight of glass fibers having an average fiber diameter of 0.3 μm or more and less than 2.0 μm. Adhesive 1-7 parts by weight is attached to a wet paper obtained by wet-making a water suspension containing 5-40 parts by weight of activated carbon fibers having a fiber length of less than 15 μm and a fiber length of 1-20 mm, and then dried. It is characterized by that.
[0021]
That is, the filter paper for an air cleaning filter of the present invention is a method in which the filter paper-constituting fibers are dispersed in water using a pulper or the like, the slurry is wet-made by a paper machine to obtain wet paper, and then dried. In order to improve the dispersibility in the raw fiber dispersion step, a method of adjusting the pH within a range of 2 to 4 with sulfuric acid acid is used, but a neutral surfactant such as a dispersant may be used.
[0022]
In addition, there are two methods for applying the adhesive: an internal addition method in which the adhesive is blended at the time of dispersion, and an external addition method in which the adhesive is attached to the wet paper obtained by a paper machine and then dried. However, the effect of the present invention is not changed, and if the total amount of the adhesive is 1 part by weight or more and 7 parts by weight or less, the internal addition method and the external addition method may be used in combination. The application method by the external addition method is not particularly limited, but a method of immersing the wet paper in the adhering liquid, a method of spraying the wet paper with a spray, a method of attaching the adhering liquid to the roll and transferring it to the wet paper, etc. Is used.
[0023]
As a drying method, it is desirable to dry at 110 to 150 ° C. using a hot air dryer or a roll dryer.
[0024]
【Example】
The test methods used in the following examples were performed as follows.
[0025]
Pressure loss Air was passed through a filter paper having an effective area of 100 cm < 2 > at a surface wind speed of 5.33 cm / sec, and the differential pressure at that time was measured with a fine differential pressure gauge.
[0026]
DOP collection efficiency DOP collection efficiency when air containing polydisperse DOP particles generated by a Ruskin nozzle is passed through a filter paper with an effective area of 100 cm 2 at a surface wind speed of 5.33 cm / sec. Measured with a laser particle counter. The target particle size was measured at 0.3 μm.
[0027]
PF value The PF value serving as an index of the filtration performance of the filter medium was obtained from the following equation based on the measured values of the pressure loss and the collection efficiency. (The higher the PF value, the higher the collection efficiency with the same pressure loss.)
[0028]
[Expression 1]
Tensile strength A test piece cut to a width of 1 inch from the longitudinal direction of the filter paper was measured using a constant speed tensile tester at a span length of 100 mm and a tensile speed of 15 mm / min.
[0030]
A 1 g toluene adsorption capacity sample was dried at 105 ° C. for 1 hour, and then the toluene adsorption capacity was measured according to JIS-K 1477-95.
[0031]
The measurement was performed in accordance with JIS at an equilibrium moisture content of 25 ° C. and RH of 37%.
[0032]
Dispersibility of activated carbon fibers The dispersibility of the activated carbon fibers in the filter paper is ◯ when the dispersibility is good, ◯ when the dispersibility is clearly confirmed, and when the dispersibility is poor. Those that could not be said were indicated by a △ evaluation.
[0033]
[Example 1]
PAN-based ACF (trade name: Fine) with a specific surface area of 750 m 2 / g, fiber diameter of 12 μm, fiber length of 5 mm, and equilibrium water content (under 37% RH) of 100 parts by weight of glass fiber having an average fiber diameter of 1.41 μm Guard, manufacturer: Toho Rayon Co., Ltd. (11 parts by weight) was blended, disaggregated with a pulper at a concentration of 0.5% and sulfuric acid pH of 3.5, and then paper was made with a paper machine to obtain a wet paper. Next, acrylic latex (trade name: Primal E-358, manufacturer: Nippon Acrylic Chemical) 1.85 parts by weight as an adhesive composition, fluorine-based water repellent (trade name: Lightguard FRG-1, manufacturer: Kyoeisha Chemical) 0.16 parts by weight of the adhesive was applied to the wet paper by the external addition method, and then dried with a roll dryer at 130 ° C. to obtain a filter paper having a basis weight of 70 g / m 2 and an adhesive adhesion amount of 6.2 parts by weight.
[0034]
The pressure loss, collection efficiency, PF value, tensile strength, and toluene adsorption ability of the obtained filter paper were measured, and the results are shown in Table 1 below.
[0035]
[Example 2]
PAN-based ACF (trade name: Fine) with a specific surface area of 900 m 2 / g, fiber diameter of 10 μm, fiber length of 8 mm, and equilibrium moisture content of 13% (under RH 37%) for 100 parts by weight of glass fiber having an average fiber diameter of 1.25 μm Guard, manufacturer: Toho Rayon Co., Ltd.) A filter paper having a basis weight of 70 g / m 2 and an adhesive adhesion amount of 6.2 parts by weight was obtained in the same manner as in Example 1 except that 25 parts by weight was blended.
[0036]
The pressure loss, collection efficiency, PF value, tensile strength, and toluene adsorption ability of the obtained filter paper were measured, and the results are shown in Table 1 below.
[0037]
Example 3
PAN-based ACF (trade name: Fine) with a specific surface area of 800 m 2 / g, fiber diameter of 12 μm, fiber length of 10 mm, and equilibrium moisture content of 14% (under RH 37%) with respect to 100 parts by weight of glass fiber having an average fiber diameter of 1.41 μm Guard, manufacturer: Toho Rayon Co., Ltd. 11 parts by weight, wet heat dissolving type polyvinyl alcohol fibrous binder (trade name: VPB107-2, manufacturer: Kuraray Co., Ltd.) 3.3 parts by weight as an internal adhesive The mixture was blended, disaggregated with a pulper at a concentration of 0.5% and sulfuric acid pH of 3.5, and then paper was made with a paper machine to obtain a wet paper. Next, a fluorine-based water repellent with a liquid concentration of 0.014% by weight was applied to the wet paper by the external addition method, and then dried with a roll dryer at 130 ° C., with a basis weight of 70 g / m 2 and an adhesive adhesion amount of 3.0%. Part of filter paper was obtained.
[0038]
The pressure loss, collection efficiency, PF value, tensile strength, and toluene adsorption ability of the obtained filter paper were measured, and the results are shown in Table 1 below.
[0039]
Example 4
PAN-based ACF with a specific surface area of 1000 m 2 / g, fiber diameter of 10 μm, fiber length of 7 mm, and equilibrium moisture content of 12% with respect to 100 parts by weight of glass fiber having an average fiber diameter of 1.25 μm (trade name: Fineguard, manufacturer: Toho A filter paper having an adhesive adhesion amount of 3.0 parts by weight was obtained in the same manner as in Example 3 except that 25 parts by weight of Rayon Co., Ltd. was blended.
[0040]
The resulting filter paper was measured for pressure loss, collection efficiency, PF value, tensile strength, and toluene adsorption capacity, and the results are shown in Table 1 below.
[0041]
[Comparative Example]
Pitch-based activated carbon fiber having a specific surface area of 1000 m 2 / g, a fiber diameter of 18 μm, a fiber length of 5 mm, and an equilibrium moisture content of 5% (under RH 37%) with respect to 100 parts by weight of glass fiber having an average fiber diameter of 1.41 μm (trade name) : Renoves, manufacturer: Osaka Gas Co., Ltd.) Except for blending 11 parts by weight, a filter paper having a basis weight of 70 g / m 2 and an adhesive adhesion amount of 6.2 parts by weight was obtained in the same manner as in Example 1.
[0042]
The resulting filter paper was measured for pressure loss, collection efficiency, PF value, tensile strength, and toluene adsorption capacity, and the results are shown in Table 1 below.
[0043]
[Table 1]
According to Table 1, filter paper using pitch-based activated carbon fibers using activated carbon fibers having a fiber diameter of 15 μm or more and an equilibrium moisture content of less than 10% has poor dispersibility, low collection efficiency, and deodorization. While the adsorption rate of components and the like is low, it can be seen that the filter paper for an air cleaning filter of the present invention has good dispersibility of activated carbon fibers, and thus has a high collection efficiency and a high adsorption rate of deodorized components and the like. .
[0045]
【The invention's effect】
The filter paper for an air cleaning filter of the present invention has the dust removal performance and the adsorption function such as deodorization of the “filter filter paper for high performance air purification” (HEPA) defined in MIL-STD MIL-F-51079C.
Claims (7)
（２）比表面積５００〜１３００ｍ2 ／ｇ、繊維径５μｍ以上１５μｍ未満、繊維長１〜２０ｍｍの活性炭素繊維を５〜４０重量部、及び
（３）接着剤を１〜７重量部
の割合で含む空気清浄フィルター用濾紙であって、
（４）０．３μｍ粒子の捕集効率が９９．９７％以上で、且つトルエンの吸着能が１％以上の空気清浄フィルター用濾紙。 (1) For 100 parts by weight of glass fiber having an average fiber diameter of 0.3 μm or more and less than 2.0 μm,
(2) 5 to 40 parts by weight of activated carbon fiber having a specific surface area of 500 to 1300 m 2 / g, fiber diameter of 5 μm to less than 15 μm and fiber length of 1 to 20 mm, and (3) 1-7 parts by weight of adhesive. Including filter paper for an air cleaning filter ,
(4) Filter paper for an air cleaning filter having a trapping efficiency of 0.3 μm particles of 99.97% or more and a toluene adsorption capacity of 1% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22420197A JP3960440B2 (en) | 1997-08-06 | 1997-08-06 | Filter paper for air cleaning filter, manufacturing method thereof, and air cleaning filter using the filter paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22420197A JP3960440B2 (en) | 1997-08-06 | 1997-08-06 | Filter paper for air cleaning filter, manufacturing method thereof, and air cleaning filter using the filter paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1147522A JPH1147522A (en) | 1999-02-23 |
| JP3960440B2 true JP3960440B2 (en) | 2007-08-15 |
Family
ID=16810118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22420197A Expired - Fee Related JP3960440B2 (en) | 1997-08-06 | 1997-08-06 | Filter paper for air cleaning filter, manufacturing method thereof, and air cleaning filter using the filter paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3960440B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1239937A1 (en) * | 1999-11-23 | 2002-09-18 | Pall Corporation | Porous media for dissipating electrical charge |
| JP4674026B2 (en) | 1999-11-23 | 2011-04-20 | ポール・コーポレーション | Conductive filter cartridge |
| JP2003071216A (en) * | 2001-09-03 | 2003-03-11 | Nitta Ind Corp | Antibacterial filter medium and production method therefor |
| GB0521910D0 (en) * | 2005-10-27 | 2005-12-07 | Madison Filter 981 Ltd | Improved filter element |
| JP5319380B2 (en) * | 2009-04-24 | 2013-10-16 | 北越紀州製紙株式会社 | Low basis weight air filter media |
| JP5635922B2 (en) * | 2011-02-03 | 2014-12-03 | 北越紀州製紙株式会社 | Filter material for air filter and method for producing the same |
-
1997
- 1997-08-06 JP JP22420197A patent/JP3960440B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1147522A (en) | 1999-02-23 |
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