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Silicon dioxide aerogel and low-corrosion preparation method thereof

A silica and airgel technology, applied in the field of airgel, can solve the problems of weakening the flame retardancy of airgel, complicating the production process, increasing production costs, etc., and achieve feasible large-scale production, stable products, and reduced The effect of small corrosion

Pending Publication Date: 2021-09-17
PAN ASIAN MICROVENT TECH JIANGSU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organosilane used in the process weakens the flame retardancy of the airgel and is more expensive
At the same time, hydrochloric acid and ammonia water are used as catalysts, and the acid-base two-step catalytic method is adopted, which complicates the production process and increases production costs, and ammonia water is less environmentally friendly to the production workshop

Method used

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  • Silicon dioxide aerogel and low-corrosion preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: see figure 1

[0034] A low-corrosion preparation method of silica airgel, comprising the following steps:

[0035] 1) Preparation of silica airgel precursor

[0036] Water glass with a modulus of 3.37 and a mass fraction of 40% was used as a silicon source and deionized water at a volume ratio of 1:2 at room temperature for 2 h to mix evenly, then slowly added 3 mol / L of acidic catalyst, and in a closed Continue to stir for 30 minutes under the same conditions until the mixture is evenly mixed to obtain a silica airgel precursor;

[0037] 2) Gel and aging of silica airgel precursor

[0038] Put the silica airgel precursor in a constant temperature oven at 60 °C, and after the precursor gels, continue aging in a constant temperature oven at 60 °C for 24 h to obtain silica gel;

[0039] 3) Solvent replacement and alkali neutralization of silica gel

[0040] For the silica gel after aging, use 99.5% ethanol for solvent replacement every 24 hours. After ...

Embodiment 2

[0044] A low-corrosion preparation method of silica airgel, except that the concentration of the alkaline alcohol solution used for alkali neutralization is 0.05 mol / L, other steps are the same as in Example 1.

Embodiment 3

[0046] A low-corrosion preparation method of silica airgel, except that the addition sequence of the alkaline alcohol solution used for alkali neutralization is advanced before the solvent replacement, other steps are the same as in Example 1.

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Abstract

The invention discloses silicon dioxide aerogel and a low-corrosion preparation method thereof. The silicon dioxide aerogel comprises water glass, deionized water and an acid catalyst, the preparation method comprises the following steps: stirring water glass serving as a silicon source and deionized water at room temperature until the water glass and the deionized water are uniformly mixed, then slowly adding an acid catalyst, and continuously stirring under a closed condition to obtain a silicon dioxide aerogel precursor; putting the material into a constant-temperature drying oven for gelling to obtain silicon dioxide gel; carrying out multiple times of solvent replacement on the aged silicon dioxide gel by using ethanol, and carrying out alkali neutralization on the silicon dioxide gel by using an alkaline alcohol solution to obtain neutral wet gel; and carrying out supercritical drying in a carbon dioxide supercritical drying kettle to prepare the silicon dioxide aerogel. In this way, corrosion of acid wet gel to supercritical drying equipment can be reduced; the controllability of each parameter in the preparation process is high, the product is stable, the large-scale production is feasible, and the method is environment-friendly.

Description

technical field [0001] The invention relates to the field of airgel, in particular to a silica airgel and a low-corrosion preparation method thereof. Background technique [0002] Silica airgel is a lightweight three-dimensional nanoporous material composed of colloidal particles or polymer molecules, with air as the dispersion medium, and has a low density (3-500 kg / m 3 ), large porosity (80~99.8%), large specific surface area (20~1000 m 2 / g), low thermal conductivity (0.013~0.025 W / (m K)), and other excellent properties, it has broad application prospects in military, medical, building materials and other fields. [0003] In the application of thermal insulation materials, silica airgel blocks the heat convection of gas molecules in the pores by virtue of its pore size smaller than the mean free path of air molecules, and at the same time uses its three-dimensional nano-skeleton to further weaken heat conduction, showing Great potential for thermal insulation applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585
Inventor 郭兴忠刘翠兰雷伟丁荣华张云
Owner PAN ASIAN MICROVENT TECH JIANGSU CORP