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Composite fiber-reinforced hydrophobic SiO2 aerogel and preparation method thereof
The invention belongs to the field of advanced composite materials and particularly relates to a composite fiber-reinforced hydrophobic SiO2 aerogel and a preparation method thereof. In the method, a proper silicon source is employed as a precursor and a sol-gel method is employed. The method includes the following steps: 1) fully mixing pre-treated composite fibers with sol, performing aging treatment and performing surface modification; 2) connecting a hydrophobic group on the surface of the gel to achieve a hydrophobic effect; 3) replacing the solvent, such as ethanol, water and the like which are high in surface tension, with a low-surface-tension solvent through solvent replacement to reduce capillary tension in the liquid during drying, thereby reducing the phenomenon of gel collapse caused by evaporation of the solvent during a normal-pressure drying process; and 4) performing the normal-pressure drying process to prepare the hydrophobic SiO2 aerogel composite material. The method is simple and quick, is reduced in production cost, can improve both the strength and toughness of the composite aerogel and broadens the application of SiO2 aerogel on surfaces of irregular-shaped objects.
Composite fiber-reinforced hydrophobic SiO2 aerogel and preparation method thereof
The invention belongs to the field of advanced composite materials and particularly relates to a composite fiber-reinforced hydrophobic SiO2 aerogel and a preparation method thereof. In the method, a proper silicon source is employed as a precursor and a sol-gel method is employed. The method includes the following steps: 1) fully mixing pre-treated composite fibers with sol, performing aging treatment and performing surface modification; 2) connecting a hydrophobic group on the surface of the gel to achieve a hydrophobic effect; 3) replacing the solvent, such as ethanol, water and the like which are high in surface tension, with a low-surface-tension solvent through solvent replacement to reduce capillary tension in the liquid during drying, thereby reducing the phenomenon of gel collapse caused by evaporation of the solvent during a normal-pressure drying process; and 4) performing the normal-pressure drying process to prepare the hydrophobic SiO2 aerogel composite material. The method is simple and quick, is reduced in production cost, can improve both the strength and toughness of the composite aerogel and broadens the application of SiO2 aerogel on surfaces of irregular-shaped objects.
Composite fiber-reinforced hydrophobic SiO2 aerogel and preparation method thereof
CHENG XUDONG (author) / LI WEI (author) / YE WEIPING (author)
2016-01-13
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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