JP4787253B2 - アルミナ被膜形成方法及びアルミナ繊維並びに同アルミナ繊維を備えたガス処理装置 - Google Patents
アルミナ被膜形成方法及びアルミナ繊維並びに同アルミナ繊維を備えたガス処理装置 Download PDFInfo
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- JP4787253B2 JP4787253B2 JP2007524044A JP2007524044A JP4787253B2 JP 4787253 B2 JP4787253 B2 JP 4787253B2 JP 2007524044 A JP2007524044 A JP 2007524044A JP 2007524044 A JP2007524044 A JP 2007524044A JP 4787253 B2 JP4787253 B2 JP 4787253B2
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Description
下限温度〔℃〕=(アルミニウム系金属の融点温度〔℃〕÷2)×0.9
そして、この人工酸化膜の下層のアルミニウムを、アルミニウム繊維を形成するアルミニウム系金属の融点温度の約2分の1から融点温度に近い温度まで加熱しながら酸化することにより、人工酸化膜の下層に更に深層酸化膜を形成し、融点を越える温度まで加熱する事により、この深層酸化膜の下層のアルミニウムを酸化して、深層酸化膜の下層に厚膜状の最深層酸化膜を形成するものである。
(1)アルミニウム繊維調製工程
(2)人工酸化膜形成工程
(3)深層酸化膜形成工程
(4)最深層酸化膜形成工程
本発明に係るアルミナ繊維の元となるアルミニウム繊維は、特に限定されるものではないが、たとえば、次のような方法によって調製することができる。
次に、アルミニウム繊維の表面に人工酸化膜を形成する方法について説明する。アルミニウム繊維の自然酸化膜の下層に形成する人工酸化膜は、同アルミニウム繊維の融点温度の約2分の1の温度(±10%までは許容する)まで加熱して形成する。
次に、人工酸化膜の下層に深層酸化膜を形成する。この深層酸化膜を形成することにより、アルミニウム繊維をアルミナ繊維とすることができる。
次に、アルミナ繊維に最深層酸化膜を形成する方法について説明する。
まず、前述の(1)〜(4)の各工程で得られた、アルミニウム繊維またはアルミナ繊維の有する酸化膜の膜厚測定を行った。
続いて、1000系アルミニウム系金属の融点の約半分の温度(350℃)に至るまで、5℃/分以下の温度勾配で加熱し、更に、融点の約半分の温度を3時間保持したのち、そのまま融点温度の−10%の温度である約600℃まで加熱、最長12時間にわたり焼成を継続したアルミナ繊維の比表面積の測定を行った。
次に、上述の試験で調製したアルミニウム繊維E−1とアルミナ繊維E−7とアルミナ繊維F−1とで、それぞれ各繊維の集合体を形成し、ディップコーティング法によりチタニアコーティングを施した例を示す。
チタンテトライソプロポキシドと、ジエタノールアミンと、エタノールとをモル比で1:2.5:34の割合で混合したゾル液
ゾルB液:
チタンテトライソプロポキシドと、アセチルアセトンと、脱イオン水と、エタノールとをモル比で1:1:3:20の割合で混合したゾル液
そして、これらのゾル液中にアルミナ繊維集合体またはアルミニウム繊維集合体を一定時間浸漬した後、ゾル液から取り出して空気中で一次乾燥をさせる。
次に、E−1を用いて調製したチタニアコートアルミニウム繊維集合体と、E−7及びF−1のチタニア繊維集合体との光触媒能を検証すべく、色素の分解性能試験を行った。また、同時にアルミナ細繊維にチタニアコーティングを行った試料についても色素の分解能試験を行った。
Cont.:チタニアコーティングを施していないアルミナ繊維集合体(コントロール)
試料1:E−1アルミニウム繊維集合体にゾルA液を用いてチタニアコーティング
試料2:E−7アルミナ繊維集合体にゾルB液を用いてチタニアコーティング
試料3:E−7アルミナ繊維集合体にゾルC液を用いてチタニアコーティング
試料4:マフテック(登録商標)ALSを用いたF−1アルミナ繊維集合体にゾルC液を用いてチタニアコーティング
試料5:マフテック(登録商標)MLS−2を用いたF−1アルミナ繊維集合体にゾルC液を用いてチタニアコーティング
試料6:マフテック(登録商標)ALSにゾルC液を用いてチタニアコーティング
試料7:マフテック(登録商標)MLS−2にゾルC液を用いてチタニアコーティング
の計8種とした。
次に、アルミニウム繊維集合体E−1にチタニアコーティングを施したチタニア被覆アルミニウム繊維集合体(以下、チタニア被覆E−1という)と、アルミナ繊維集合体E−7及びF−1からそれぞれ形成した及びチタニア繊維集合体(以下、それぞれE−7チタニア繊維集合体及びF−1チタニア繊維集合体という)の光触媒作用による消臭能力を調べるために、密閉容器に封入したアセトアルデヒドを分解する試験を行った。
試料1:E−7チタニア繊維集合体
試料2:マフテック(登録商標)ALSを結合させたF−1チタニア繊維集合体
試料3:マフテック(登録商標)MLS−2にゾルC液を用いてチタニアコーティング
図5(a)に試料1、図5(b)に試料2、図5(c)に試料3の試験結果をそれぞれ示す。図5(a)、(b)、(c)より、いずれも優れた光触媒能を有している事がわかる。
次に、図6に示す試験装置に、C−2チタニア繊維集合体または比較試料を収納し、NO(一酸化窒素)を送気することでNOx試験を行った。本試験法は発明者が独自に改良したJIS法に類似の試験方法としており、試料が繊維形状であることから、NOが繊維内部を通気するようにして試料の評価を行っている。なお、JIS法に供するための試験装置を図6(a)に、本発明者が試験したJIS変法を(b)に示す。
チタニア繊維またはチタニア繊維集合体は、OH−またはO−のラジカル基等のいわゆるマイナスイオンやイオンクラスターと呼ばれる環境改善イオンを発生させる光触媒体として機能させることができる。
次に、チタニア繊維集合体を空気清浄機のフィルターに適用した例を示す。
前記排気口18aに炭素繊維収容室111を取り付けることで、活性炭素繊維を触媒・吸着剤として、前記ガス流路部14で処理できなかったガス中の有害物質(例えば有機ガス中の窒素化合物)を炭素繊維収容室111内で吸着・還元処理し、その後、排気するようにしており、ガスの処理効率を向上させるようにしている。
Claims (4)
- 表面を自然酸化膜で被覆したアルミニウム製またはアルミニウム合金製のアルミニウム繊維を、その融点温度の2分の1の温度まで、毎分当たり5℃以下の温度勾配を維持しながら加熱した後に、融点温度の2分の1の温度を所定時間保持して、酸化膜の膜厚を5nm以上とする工程と、
この5nm以上の膜厚の酸化膜を有する繊維を、前記アルミニウム繊維の融点温度よりも10%低い温度から、前記アルミニウム繊維の融点温度までの温度範囲内の温度に加熱した後に、同温度範囲内の温度で所定時間保持して、酸化膜の膜厚を50nm以上とする工程と、を有することを特徴とするアルミナ被膜形成方法。 - 表面を自然酸化膜で被覆したアルミニウム製またはアルミニウム合金製のアルミニウム繊維を、その融点温度の2分の1の温度まで、毎分当たり5℃以下の温度勾配を維持しながら加熱した後に、融点温度の2分の1の温度を所定時間保持して、酸化膜の膜厚を5nm以上とする工程と、
この5nm以上の膜厚の酸化膜を有する繊維を、前記アルミニウム繊維の融点温度よりも10%低い温度から、前記アルミニウム繊維の融点温度までの温度範囲内の温度に加熱した後に、同温度範囲内の温度で所定時間保持して、酸化膜の膜厚を50nm以上とする工程と、
この50nm以上の膜厚の酸化膜を有する繊維を、前記アルミニウム繊維の融点温度を超えた温度で加熱する工程と、を有することを特徴とするアルミナ被膜形成方法。 - 請求項1又は請求項2に記載のアルミナ被膜形成方法にて形成したアルミナ被膜を有するアルミナ繊維であって、
前記アルミナ被膜の下層は、前記アルミニウム又はアルミニウム合金の状態としていることを特徴とするアルミナ繊維。 - ガスを送気させる流路中に、ガス処理用フィルターを設け、ガスを処理するガス処理装置において、
前記ガス処理用フィルターに水を供給する給水部を具備し、前記ガス処理用フィルターの表面に水フィルターを形成するように構成するとともに、
前記ガス処理用フィルターは、請求項3に記載のアルミナ繊維を備えていることを特徴とするガス処理装置。
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |