Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for rapidly preparing hydrophobicsilica aerogel by carbon dioxidesubcritical drying method
The invention discloses a method for rapidly preparing hydrophobicsilica aerogel by a carbon dioxidesubcritical drying method. The method disclosed by the invention comprises the following steps: (1) adding alcohol to a mixed solution of silicate ester, ethoxysilane and water and fully hydrolyzing in the presence of acid to obtain sol; (2) adding alkali into the sol, adjusting the pH value of the system to 6-10 to obtain sol which is nearly neutral or alkaline; mixing the sol which is nearly neutral or alkaline with fibers to prepare a gel-fiber composite material; and aging the obtained wet gel or aerogel-fiber composite material; and (3) putting the aged wet gel or aerogel-fiber composite material in a drying kettle and drying at a carbon dioxidesubcritical state to obtain the finished product. According to the method disclosed by the invention, a surface hydrophobic modification link is omitted, the obtained gel substrate is elastic and high in porosity; in addition, the method is performed at a temperature of 10-30 DEG C under a pressure lower than 6MPa, thereby greatly reducing energy consumption.
Method for rapidly preparing hydrophobicsilica aerogel by carbon dioxidesubcritical drying method
The invention discloses a method for rapidly preparing hydrophobicsilica aerogel by a carbon dioxidesubcritical drying method. The method disclosed by the invention comprises the following steps: (1) adding alcohol to a mixed solution of silicate ester, ethoxysilane and water and fully hydrolyzing in the presence of acid to obtain sol; (2) adding alkali into the sol, adjusting the pH value of the system to 6-10 to obtain sol which is nearly neutral or alkaline; mixing the sol which is nearly neutral or alkaline with fibers to prepare a gel-fiber composite material; and aging the obtained wet gel or aerogel-fiber composite material; and (3) putting the aged wet gel or aerogel-fiber composite material in a drying kettle and drying at a carbon dioxidesubcritical state to obtain the finished product. According to the method disclosed by the invention, a surface hydrophobic modification link is omitted, the obtained gel substrate is elastic and high in porosity; in addition, the method is performed at a temperature of 10-30 DEG C under a pressure lower than 6MPa, thereby greatly reducing energy consumption.
Method for rapidly preparing hydrophobicsilica aerogel by carbon dioxidesubcritical drying method
TIAN LEI (Autor:in) / DONG HAIBING (Autor:in)
16.09.2015
Patent
Elektronische Ressource
Englisch
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