A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method for rapidly preparing hydrophobic silica aerogel through subcritical drying of methanol
The invention relates to a method for rapidly preparing hydrophobic silica aerogel through subcritical drying of methanol. The method comprises the steps of (1) sufficiently hydrolyzing silicate ester and ethoxysilane proportioning solution in a methanol environment under the action of an acid catalyst; (2) adding an alkali catalyst, and then, enabling near-neutral or alkali gel to form wet gel; or after obtaining the near-neutral or alkali gel, compounding the near-neutral or alkali gel and inorganic fibers to prepare a gel-fiber composite, and aging; and after aging, placing the gel-fiber composite into a methanol extracting device, and drying; and (3) heating and increasing the pressure until being up to the subcritical state of methanol, separating and extracting methanol in pores of dried hydrophobic silica aerogel, cooling, releasing the pressure and standing to obtain the hydrophobic silica aerogel. A solvent replacement link is omitted in the method, so that the time is saved, and the energy cost is reduced; the drying temperature is 180-200 DEG C, the pressure is 5-6MPa, and the energy consumption is greatly reduced; and methanol provides parts of hydrophobic groups for a body, and a proper amount of methylethoxysilane is introduced to a silicon source, so that the hydrophobicity of the hydrophobic silica aerogel is ensured.
Method for rapidly preparing hydrophobic silica aerogel through subcritical drying of methanol
The invention relates to a method for rapidly preparing hydrophobic silica aerogel through subcritical drying of methanol. The method comprises the steps of (1) sufficiently hydrolyzing silicate ester and ethoxysilane proportioning solution in a methanol environment under the action of an acid catalyst; (2) adding an alkali catalyst, and then, enabling near-neutral or alkali gel to form wet gel; or after obtaining the near-neutral or alkali gel, compounding the near-neutral or alkali gel and inorganic fibers to prepare a gel-fiber composite, and aging; and after aging, placing the gel-fiber composite into a methanol extracting device, and drying; and (3) heating and increasing the pressure until being up to the subcritical state of methanol, separating and extracting methanol in pores of dried hydrophobic silica aerogel, cooling, releasing the pressure and standing to obtain the hydrophobic silica aerogel. A solvent replacement link is omitted in the method, so that the time is saved, and the energy cost is reduced; the drying temperature is 180-200 DEG C, the pressure is 5-6MPa, and the energy consumption is greatly reduced; and methanol provides parts of hydrophobic groups for a body, and a proper amount of methylethoxysilane is introduced to a silicon source, so that the hydrophobicity of the hydrophobic silica aerogel is ensured.
Method for rapidly preparing hydrophobic silica aerogel through subcritical drying of methanol
TIAN LEI (author) / DONG HAIBING (author)
2015-09-02
Patent
Electronic Resource
English
Hydrophobic silica aerogel blanket and method for preparing same
| European Patent Office | 2025
Method for rapidly preparing hydrophobicsilica aerogel by carbon dioxidesubcritical drying method
| European Patent Office | 2015
Preparation and Characterization of Hydrophobic Silica Aerogel by Ambient Pressure Drying Method
| British Library Online Contents | 2013
Hydrophobic silica aerogel heat-insulation composite material
| European Patent Office | 2015