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Method for preparing silica aerogel

A technology of silica and airgel, applied in the field of materials, can solve the problems of high primary cost and poor effect of silica airgel, and achieve the effect of high porosity, low density and uniform gel network

Inactive Publication Date: 2013-12-18
KUNSHAN AODELU AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: the purpose of the present invention is to provide a method for preparing silica airgel, in order to overcome the problem of poor primary cost in preparing silica airgel in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add small molecule alcohol to the tetraethoxysilane solution, add butanone to obtain a mixed solution; then add hydrochloric acid to the resulting mixed solution to adjust the pH value to 4; then add ethyl cellulose to mix, and electrify at both ends of the solution , the power-on time is 10min; after power-on, pour the solution into a mold whose inner cavity is filled with carbon fiber material to preform; finally, the obtained preformed products are aged sequentially, and the aged products are added into ethanol solvent for solvent exchange, Finally, supercritical drying is carried out to obtain silica airgel.

[0021] The silica airgel prepared by the invention has a specific surface area of ​​850 m2 / g, a porosity of 90%, and a density of 0.17 g / cm3.

Embodiment 2

[0023] Add small molecule alcohol to tetraethoxysilane solution, add N,N-dimethylformamide to obtain a mixed solution; then add ammonium fluoride to the resulting mixed solution to adjust the pH to 3; then add ethyl The cellulose is mixed, and the two ends of the solution are energized for 5 minutes; after the energization is completed, the solution is poured into a mold whose inner cavity is filled with aramid material to preform; finally, the obtained preformed products are aged sequentially, and the aged The product was added into an ethanol solvent for solvent exchange, and finally supercritically dried to obtain a silica airgel.

[0024] The silica airgel prepared by the invention has a specific surface area of ​​1150 m2 / g, a porosity of 97.5%, and a density of 0.085 g / cm3.

Embodiment 3

[0026] Add small molecule alcohol to the tetraethoxysilane solution, add butanone to obtain a mixed solution; then add hydrochloric acid to the resulting mixed solution to adjust the pH value to 5; then add ethyl cellulose to mix, and electrify at both ends of the solution , the power-on time is 15min; after power-on, the solution is poured into a mold whose inner cavity is filled with ultra-high molecular weight polyethylene material to preform; finally, the obtained preformed products are aged sequentially, and the aged products are added to ethanol solvent Perform solvent exchange, and finally perform supercritical drying to obtain silica airgel.

[0027] The silica airgel prepared by the invention has a specific surface area of ​​1050 m2 / g, a porosity of 95%, and a density of 0.10 g / cm3.

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Abstract

The invention discloses a method for preparing silica aerogel. The method comprises the following steps: adding micromolecular alcohol to a silicon source solution; adding butanone to obtain a mixed solution; adding ammonium fluoride to the mixed solution to adjust the pH value to 3-4, mixing with ethyecellulose, and electrifying at two ends of the solution; pouring the solution into a die of which an inner cavity is filled by a reinforced fiber material to pre-mold after electrification is finished; sequentially carrying out aging, solvent exchange and supercritical drying on the pre-molded product, so as to obtain the silica aerogel. The gel of silica prepared by the method is even in mesh; the finally obtained silica aerogel is low in density and high in porosity.

Description

[0001] technical field [0002] The invention relates to the field of material technology, in particular to a preparation method of silica airgel. Background technique [0003] Silica airgel has the advantages of low density, large specific surface area, and high porosity, and has broad application prospects in thermal insulation systems, acoustic impedance, and catalyst carriers. At present, the surface of the prepared silica airgel contains a large amount of sodium ions, potassium ions and hydroxyl groups, which are easily affected by moisture in the air, affecting its acoustic, optical and electrical properties, and seriously affecting its application range. Contents of the invention [0004] Purpose of the invention: The purpose of the present invention is to provide a method for preparing silica aerogels, so as to overcome the problem of poor effect and high cost of preparing silica aerogels in the prior art. [0005] Technical solution: The technical solution adopte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 郁彬
Owner KUNSHAN AODELU AUTOMATION TECH
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