Patent
Preparation method for hydrophobic large-size bulk nanometer porous SiO2 aerogel
TLDR
In this article, a preparation method for SiO2 aerogel is proposed, which is simple in process, cheap in price and suitable for large-scale production and application.Abstract:
The invention belongs to the technical field of preparation of inorganic nanometer porous materials, and relates to a preparation method for SiO2 aerogel. The preparation method includes following steps: (1) preparation of silica sol; (2) formation and ageing of wet gel; (3) replacement of solvent of the wet gel; (4) surface modification and replacement of the solvent of the wet gel; and (5) constant-pressure drying. The preparation method is simple in process, cheap in price and suitable for large-scale production and application. Tests show that prepared hydrophobic large-size bulk nanometer porous SiO2 aerogel has high specific surface area, low density and low heat conductivity, and has a stable hydrophobic property at temperature ranging from room temperature to 400 DEG C. Accordingly, an absorption property and a heat insulation property of the SiO2 aerogel prepared by the preparation method are excellent, and the SiO2 aerogel has an excellent application prospect in the fields of heat insulation and energy conservation.read more
Citations
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Patent
Silicon dioxide aerogel material and preparation method thereof
TL;DR: In this paper, a silicon dioxide aerogel material and a preparation method for high-efficiency production is described, which can be used for heat preservation and thermal insulation of nuclear power and liquefied natural gas equipment and pipelines.
Patent
Method for preparing silicon dioxide aerogel with low density and large specific surface area at ordinary pressure
TL;DR: In this article, a method for preparing silicon dioxide aerogel with low density and large specific surface area at ordinary pressure is presented, which comprises the steps of taking cheap industrial water glass as a precursor and absolute ethyl alcohol as a solvent, performing hydrolysis and polycondensation reaction by the catalysis of acid and alkali respectively to form wet gel, performing water bath drying and aging, performing solvent exchange for many times, and performing graded drying at the ordinary pressure after surface modification to form the silicon dioxide aerosol with the low density.
Patent
Method for preparing composite SiO2 aerogel felt
Wang Tianfu,Peng Zhanjun +1 more
TL;DR: In this paper, a method for the preparation of composite SiO2 aerogel felt was proposed, which includes: using water glass which is low in cost as a raw material; forming silica sol under catalytic conditions; adding fiber felt in the process of gel dissolving and condensing; preparing the composite Si-O2 felt having a super-hydrophobic function, ultra-low heatconducting coefficient and high mechanical strength through steps of aging, solvent grade displacement, surface modification and normal-pressure drying.
Patent
Preparation method of transparent silicon dioxide aerogel
TL;DR: In this paper, a preparation method of transparent silicon dioxide aerogel is presented. But the preparation method comprises the following steps: 1) solution preparation and silicon source co-precursor hydrolysis; 2) ion exchange and silicon dioxide hydrogel preparation by using gel; and 3) aging, alcoholizing, modifying and normal-pressure drying of the silicon dioxide gel.
Patent
Method for preparing hydrophobic SiO2 aerogel by virtue of normal pressure drying
TL;DR: In this paper, a two-step method is adopted, an organic silicon source as precursor, water as a hydrolysis agent, absolute ethyl alcohol as a solvent, acid and alkali as catalysts, and a surface modifier.
References
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Patent
Organically modified aerogels, method for their production by surface modification of the aqueous gel without previous solvent exchange and subsequent drying and the use thereof
Fritz Schwertfeger,Dierk Frank +1 more
TL;DR: In this paper, a method for the production of organically modified aerogels is described, in which a hydrogel is provided, and the surface of the hydrogels obtained in step (a) is modified, and then the modified surface is dried and used for the use of the aerogel.
Patent
Surface activity adjustable nano porous silicon dioxide aerogel and its preparation method
TL;DR: In this paper, a silica dioxide aerogel is used to transform the original hydrophobic state of a particle to hydrophilic state according to the practical need, suitable for different application requirement.
Patent
Process for preparation of nano multiporous silicon dioxide aerogel block
Zhou Bin,Huang Yaodong,Shen Jun +2 more
TL;DR: The process of producing silica aerogel block adopts the materials including polysiloxane E-40 as Si source, ethanol, water and hydrofluoric acid.
Patent
Method for preparing hydrophobic silica aerogel from rice husk ash based aquagel
TL;DR: In this article, a method for preparing hydrophobic silicon dioxide aerogel by rice hull ash based water gel was proposed, which adopts advanced technologies of the solvent replacement, the surface finish and the preparation of the normal-pressure aerogels.