JP6087594B2 - 導電性を有する集塵部用抗ウイルス性フィルタ - Google Patents
導電性を有する集塵部用抗ウイルス性フィルタ Download PDFInfo
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Description
(実施例1)
PET不織布(安積濾紙(株)製336)を50℃に加温した界面活性剤を含む水溶液に、5分間浸漬後、水洗し表面を洗浄した。続いて、パラジウムコロイド溶液に浸漬した後、水洗しパラジウムコロイド粒子を表面に吸着させた。その後、無電解銅めっき液に上記不織布を浸漬し無電解銅めっき処理を行い、表面に銅を析出し導電層を形成させた。続いて、過塩素酸カリウム溶液中に上記不織布を浸漬し、水洗及び乾燥し導電層の表面に亜酸化銅(Cu2O)を形成させることで導電層表面に抗ウイルス層を備えた抗ウイルス性フィルタを得た。
基材をガラス繊維紙(北越紀州製紙(株)製H730−A)とした以外は実施例1と同様の方法にて実施例2の抗ウイルス性フィルタを得た。
実施例1で用いたPET不織布(安積濾紙(株)製336)そのものを比較例1とした。
実施例1で用いたPET不織布(安積濾紙(株)製336)に、導電層として無電解ニッケル処理によりニッケル膜を形成し、抗ウイルス層は形成していないものを比較例2とした。
実施例1でCuの導電層を形成した不織布を過硫酸カリウム溶液に浸漬し、水洗及び乾燥し、導電層を完全に酸化させCuO膜を形成したものを比較例3とした。
直径36mmの大きさのフィルタを試験体とし、捕集効率試験機(柴田科学株式会社製、AP-632F型)を用いて、20L/minの流量時の実施例1、2、比較例1〜3の各サンプルにおける通気抵抗を測定した。
次に、集塵効率について測定した。図2のように、実施例1、2、比較例1〜3の各サンプルを集塵電極として、電位差12kVの電圧を印加させた。0.1μmのNaCl粒子を試験粒子として、捕集効率試験機(柴田科学株式会社製、AP-632F型)にて、20L/minの流量時の集塵効率を測定した。
実施例1、2、比較例1〜3の各サンプルの抗ウイルス性能評価は、エンベロープを持つウイルスとして、MDCK細胞を用いて培養したインフルエンザウイルス(influenza A/北九州/159/93(H3N2))を用いた。フィルタサンプル(4cm×4cm)を滅菌済みのバイアル瓶に入れ、ウイルス液0.1 mlを滴下し、室温で5分間作用させた。5分間作用させたのち、20mg/mlのブイヨン蛋白液1.9mlを添加し、ピペッティングによりウイルスを洗い出した。その後、各反応サンプルが10-2〜10-5になるまでMEM希釈液にて希釈を行った(10倍段階希釈)。シャーレに培養したMDCK細胞にサンプル液100μLを接種した。90分間静置しウイルスを細胞へ吸着させた後、0.7%寒天培地を重層し、48時間、34℃、5%CO2インキュベータにて培養後、ホルマリン固定、メチレンブルー染色を行い形成されたプラーク数をカウントして、ウイルスの感染価(PFU/0.1ml,Log10);(PFU:plaque-forming units)を算出した。その試験結果を表2に示す。
図4に示すようなフィルタユニットを搭載した電機集塵機を1m3のBOX内に設置し、イオン化手段に電位差6kVの電圧、集塵手段に電位差12kVの電圧を印加させた。1m3当り1×1010個の空中浮遊インフルエンザウイルス(influenza A/北九州/159/93(H3N2))を0.8m3/minの流量でBOX内の空気を循環させた。循環前、循環15分後、30分後のBOX内の浮遊ウイルスをそれぞれゼラチンフィルタで回収し、回収したウイルスを寒天培地にて培養しプラーク数を計測した。循環前のプラーク数(P0)と循環後のプラーク数(Pm)から、各試験時間におけるBOX内の浮遊ウイルス残存率P(%)を次式(1)より求めた。
その結果を図5に示す。
2 導電層
3 基材
10 導電性を有する集塵部用抗ウイルス性フィルタ
20 放電電極
30 高圧電源
40 ファン
50 放電線
60 対向電極
70 第二の高圧電源
80 集塵手段
90 イオン化手段
100 電気集塵機
Claims (4)
- 通気性を有する繊維構造体を含む、電気集塵機の集塵部に用いられるフィルタの製造方法であって、
前記繊維構造体の表面の少なくとも一部に金属銅の導電層を形成し、
前記導電層の金属銅の表面を酸化させて前記導電層の表面の少なくとも一部にCu 2 Oを含む抗ウイルス層を形成することを特徴とする電気集塵機用の抗ウイルス性フィルタの製造方法。 - 前記金属銅の導電層を形成した前記繊維構造体を、酸化剤を含む水溶液に浸漬して前記導電層の金属銅の表面を酸化させて前記導電層の表面の少なくとも一部にCu 2 Oを含む抗ウイルス層を形成することを特徴とする請求項1に記載の電気集塵機用の抗ウイルス性フィルタの製造方法。
- 前記酸化剤を含む水溶液が過塩素酸カリウム溶液であることを特徴とする請求項2に記載の電気集塵機用の抗ウイルス性フィルタの製造方法。
- 前記繊維構造体を、無電解銅めっき液に浸漬することにより、又は電気めっきにより、前記繊維構造体の表面に銅を析出させて、前記金属銅の導電層を形成することを特徴とする請求項1から3のいずれか1つに記載の電気集塵機用の抗ウイルス性フィルタの製造方法。
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JPH02211262A (ja) * | 1989-02-13 | 1990-08-22 | Nippon Steel Corp | 電気集塵機 |
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