Method for preparing spherical silica aerogel granule, and spherical silica aerogel granule prepared thereby
A technology of spherical silica and airgel particles, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of low productivity of spherical silica airgel powder and difficulty in obtaining uniform spherical powder , Not suitable for large-scale production and other issues, to achieve excellent fluidity, shorten processing time, reduce risks and costs
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0037] The invention provides a method for preparing spherical silica airgel particles, comprising:
[0038] a) water glass solution is mixed with solvent to prepare mixed solution;
[0039] b) adding a surfactant to the mixed solution;
[0040] c) adding a neutralizing agent to the mixed solution to form a silica sol;
[0041] d) adding a gelling agent to the silica sol to form a silica gel;
[0042] e) solvent displacement the silica gel and adding a surface modifier to the silica gel to hydrophobize the silica gel; and
[0043] f) Drying of the hydrophobized silica gel.
[0044] First, the present invention includes step a): mixing a water glass solution with a solvent to prepare a mixed solution.
[0045] According to an exemplary embodiment of the present invention, water glass can be made of Na 2 O nSiO 2 (n=2 to 4) and a small amount of Fe 2 o 3 Composition, and the concentration can be 28% by weight to 30% by weight.
[0046] Water glass exhibits high adhesive...
Embodiment 1
[0089] Water glass (sodium silicate available from Young Il Chemical Co., Ltd.; silica content: 28% by weight to 30% by weight, SiO 2 :Na 2 O=3.52:1) to prepare SiO 2 A water glass solution with a content of 7.5% by weight. After that, the water glass solution was mixed with hexane at a volume ratio of 1:1 to prepare a mixed solution. As a surfactant, sorbitan monooleate (SPAN 80) was added to the mixed solution at a volume ratio of 5%. Subsequently, with respect to the mixed solution, acetic acid as a neutralizing agent was added at a volume ratio of 10%, and isopropanol as a gelling agent was added at a volume ratio of 1:2 (mixed solution:gelling agent) to prepare di silica gel. After solvents other than the gelled silica were removed, ethanol was added for solvent replacement, and HMDS as a surface modifier was added at a volume ratio of 17% to the mixed solution, stirred, and then kept for about one hour. The obtained airgel was washed with ethanol and then dried in a...
Embodiment 2 to 8
[0091] Spherical silica airgel particles were prepared in the same manner as in Example 1 under different preparation conditions as listed in Table 1 below.
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle size | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
| specific surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More