JP2010528835A - 特定の気孔形成剤を用いて多孔質支持体に無機多孔質被膜を形成する方法 - Google Patents
特定の気孔形成剤を用いて多孔質支持体に無機多孔質被膜を形成する方法 Download PDFInfo
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- JP2010528835A JP2010528835A JP2010510346A JP2010510346A JP2010528835A JP 2010528835 A JP2010528835 A JP 2010528835A JP 2010510346 A JP2010510346 A JP 2010510346A JP 2010510346 A JP2010510346 A JP 2010510346A JP 2010528835 A JP2010528835 A JP 2010528835A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249955—Void-containing component partially impregnated with adjacent component
- Y10T428/249956—Void-containing component is inorganic
- Y10T428/249957—Inorganic impregnant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249981—Plural void-containing components
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Abstract
Description
本実施例における新しい膜塗布手法は多孔質αアルミナモノリシック支持体に関するものである。裸のモノリシック支持体がαアルミナから成り、外径8.7〜10.0mm、長さ80〜150mmであり、断面全体にわたり均一に分布した平均径が0.75mmの19の円形チャンネルを有している。水銀ポロシメーターによる裸支持体の平均孔サイズが8.4〜8.7μm、空隙率が43.5〜50.8%である。
無機被膜は干割れ、層間剥離、気孔閉鎖のような問題に遭遇することが多い。PEG、PVP、PVAのような干割れ防止用の有機材料が使用されることが多い。しかし、多くの場合、これらの添加剤は有効ではない。
無機被膜は、干割れ及び層間剥離問題の他に、孔の構造に関連した別の問題にも遭遇している。これは高流束且つ均一な孔構造及び高空隙率が必要とされているためである。しかし、従来の塗膜方法では、一般に乾燥及び焼成工程における粒子パッキングにより孔構造が形成されるため空隙率が限定される。
本実施例は段階的孔構造を有する2種類の多孔質αアルミナ膜の沈着である。段階的孔構造を有する多層膜は流れ抵抗が小さく流束が大きい。本被膜の支持体として、実施例1と同様のアルミナプレコートモノリシック支持体を使用した。
本実施例は脱脂粉乳を気孔形成剤として用いた別の多層αアルミナ膜沈着の説明である。本実施例で使用した2種類の水性アルミナ被膜溶液は5重量%のAA−07及び5重量%のAKP30Mであった。懸濁液AA−07の調製手順は実施例4と同様である。懸濁液AKP30Mは気孔形成剤として機能する17重量%の脱脂粉乳を含んでいる。これには実施例3と同様の脱脂粉乳を使用した。大気条件下において、5重量%の(実施例4と同様の)AKP30を含む100gの被膜溶液に20gの脱脂粉乳を混合することにより、被膜懸濁液AKP30Mを調製した。実施例4で説明したように、モノリシック支持体にAA−07及びAKP30M被膜懸濁液を順次塗布することにより、アルミナ膜AA−07/AKP30Mを形成した。形成した2層被膜を1150℃で2時間焼入れした。
実験室規模の濾過試験装置により、脱イオン水を用いて前記実施例4及び5で形成した被膜の透過性を測定した。約170cm/sの線速度で脱イオン水を被膜のチャンネル内に通した。流路とモノリシック被膜体外部との間に約25psi(約172413.8Pa)の圧力勾配を維持した。このような圧力を駆動力として脱イオン水が被膜層を横断して流れ、多孔質支持体内に浸透し、モノリシック体外部に流れ出す。図12は3種類の膜構造体、AA−07/A−16、AA−07/AKP30、及びAA−07/AKP30Mの水の透過性を示す図である。透過性の測定は膜構造体の透過率を測定するもので、下記の式によって求められる。
12 内部チャンネル
14 多孔質壁14
40 プリコート
50 外部被膜層
1402 液状先駆体塗布溶液
1404 モノリシック支持体
1406 チャンバー
Claims (10)
- 多孔質支持体に無機多孔質被膜を形成する方法であって、
第1端部、第2端部、及び多孔質壁によって画成される表面を有し、前記第1端部から第2端部に延びる複数の内部チャンネルを備えた多孔質支持体を提供するステップ、
前記支持体の前記内部チャンネル表面に無機粒子と、蛋白質粒子、澱粉粒子、合成高分子粒子、及びこれらの組合せから選択される有機気孔形成材料とから成る被膜を塗布するステップ、及び
前記被膜を塗布した支持体を加熱して前記有機気孔形成材料を除去し無機多孔質被膜を残すステップ
の各ステップを有して成ることを特徴とする方法。 - 前記多孔質支持体がハニカムモノリスであることを特徴とする請求項1記載の方法。
- 前記多孔質支持体が無機質であることを特徴とする請求項1記載の方法。
- 前記無機多孔質支持体がセラミックから成り、前記内部チャンネルが該多孔質セラミック支持体の多孔質壁によって画成される表面を有して成ることを特徴とする請求項3記載の方法。
- 前記有機気孔形成材料が蛋白質粒子を含んで成ることを特徴とする請求項1記載の方法。
- 前記有機気孔形成材料が合成高分子粒子を含んで成ることを特徴とする請求項1記載の方法。
- 前記無機粒子と有機気孔形成材料とから成る被膜が、コージライト粒子、アルミナ粒子、ムライト粒子、チタン酸アルミニウム粒子、チタニア粒子、ジルコニア粒子、セリア粒子、又はこれらの組合せを含んで成ることを特徴とする請求項1記載の方法。
- 前記被膜を塗布した支持体を加熱するステップが、該支持体を焼き入れすることにより前記有機気孔形成材料をか焼し無機多孔質被膜を残すことを特徴とする請求項1記載の方法。
- 前記無機多孔質被膜の無機粒子を焼結するステップを更に有して成ることを特徴とする請求項1記載の方法。
- 第1端部、第2端部、及び無機粒子から成る多孔質外部被膜によって画成される表面を有し、前記第1端部から第2端部に延びる複数の内部チャンネルを備えた多孔質支持体から成る被膜多孔質支持体であって、
前記無機粒子から成る外部被膜の水銀ポロシメーターによる空隙率が40%以上であり、
前記無機粒子から成る多孔質外部被膜の水銀ポロシメーターによる孔サイズの分布において、d90以下のサイズの孔、d50以下のサイズの孔、及びd10以下のサイズの孔がそれぞれ全孔容積の90%、50%、及び10%を占めるとき、条件(d90−d10)/d50≦2を満足する
ことを特徴とする支持体。
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US60/932,462 | 2007-05-31 | ||
US11/880,073 | 2007-07-19 | ||
US11/880,073 US7767257B2 (en) | 2007-05-31 | 2007-07-19 | Method for preparing a porous inorganic coating on a porous support using certain pore formers |
PCT/US2008/006819 WO2008153828A2 (en) | 2007-05-31 | 2008-05-29 | Method for preparing a porous inorganic coating on a porous support using certain pore formers |
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JP2010528835A true JP2010528835A (ja) | 2010-08-26 |
JP2010528835A5 JP2010528835A5 (ja) | 2013-02-21 |
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US (1) | US7767257B2 (ja) |
EP (1) | EP2066426B1 (ja) |
JP (1) | JP5302957B2 (ja) |
KR (1) | KR101501792B1 (ja) |
CN (1) | CN101678281B (ja) |
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EP2066426A2 (en) | 2009-06-10 |
EP2066426B1 (en) | 2013-04-17 |
CN101678281B (zh) | 2012-09-05 |
KR101501792B1 (ko) | 2015-03-11 |
WO2008153828A2 (en) | 2008-12-18 |
KR20100028067A (ko) | 2010-03-11 |
TWI388372B (zh) | 2013-03-11 |
JP5302957B2 (ja) | 2013-10-02 |
US7767257B2 (en) | 2010-08-03 |
US20080299377A1 (en) | 2008-12-04 |
CN101678281A (zh) | 2010-03-24 |
TW200920472A (en) | 2009-05-16 |
WO2008153828A3 (en) | 2009-02-19 |
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