Procédé de préparation d'un aérogel composite oxyde métallique-silice et aérogel composite oxyde métallique-silice préparé par ledit procédé

Method for preparing metal oxide-silica composite aerogel and metal oxide-silica composite aerogel prepared by means of same

금속산화물-실리카 복합 에어로겔의 제조방법 및 이를 이용하여 제조된 금속산화물-실리카 복합 에어로겔

Abstract

The present invention provides a method for preparing metal oxide-silica composite aerogel and metal oxide-silica composite aerogel which is prepared by means of same and has a low tap density and a high specific surface area, the method comprising the steps of: preparing a silicate solution by dissolving water glass so as to have a concentration from 0.125M to 3.0M; adding a metal salt solution, of which the metal ion concentration is from 0.125M to 3.0M, to the silicate solution, mixing same, then adjusting the pH of a mixture obtained as a result thereof to be from 3 to 9, thereby precipitating a metal oxide-silica composite precipitate; and separating the metal oxide-silica composite precipitate and drying same, wherein the metal salt solution comprises magnesium (Mg)-containing metal salts in an amount which enables a magnesium ion content to exceed 50 mol% with respect to the total mol of the metal ions in the metal salt solution.
본 발명에서는 물유리를 0.125M 내지 3.0M의 농도로 용해시켜 실리케이트 용액을 준비하는 단계; 상기 실리케이트 용액에, 금속이온의 농도가 0.125M 내지 3.0M인 금속염 용액을 첨가하여 혼합한 후, 결과로 수득되는 혼합물의 pH를 3 내지 9로 조절하여 금속산화물-실리카 복합 침전물을 침전시키는 단계; 및 상기 금속산화물-실리카 복합 침전물을 분리하고, 건조하는 단계를 포함하며, 상기 금속염 용액은 금속염 용액내 금속이온의 총 몰에 대하여 마그네슘 이온의 함량이 50몰% 초과가 되도록 하는 양으로 마그네슘(Mg) 포함 금속염을 포함하는 것인 금속산화물-실리카 복합 에어로겔의 제조방법, 및 이에 따라 제조되어 낮은 탭밀도 및 높은 비표면적을 갖는 금속산화물-실리카 복합 에어로겔을 제공한다.
La présente invention concerne un procédé de préparation d'un aérogel composite oxyde métallique-silice et un aérogel composite oxyde métallique-silice qui est préparé par ledit procédé et a une faible masse volumique après tassement et une surface spécifique élevée, le procédé comprenant les étapes suivantes : préparation d'une solution de silicate par dissolution de verre soluble de façon à obtenir une concentration de 0,125 à 3M ; ajout d'une solution de sels métalliques, ayant une concentration d'ions métalliques de 0,125 à 3M, à la solution de silicate, mélange, puis ajustement du pH du mélange ainsi obtenu de 3 à 9, pour obtenir ainsi un précipité de type composite oxyde métallique-silice ; et séparation et séchage du précipité d'oxyde métallique-silice, la solution de sels métalliques comprenant des sels métalliques contenant du magnésium (Mg) qui permet d'obtenir une teneur en ions magnésium supérieure à 50 % en moles par rapport à la quantité totale de moles d'ions métalliques dans la solution de sels métalliques.

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