Efficient preparation technology of silicon dioxide aerogel

A silicon dioxide and preparation technology, applied in the direction of inorganic chemistry, silicon compounds, chemical instruments and methods, etc., can solve the problems of high production cost and unsatisfactory cost performance, achieve reasonable cost performance, reduce production processes and raw materials, and be environmentally friendly Effect

Inactive Publication Date: 2018-02-02
孙学峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica airgel, as one of the best insulation materials in the world, has also been paid more and more attention to by people, but its production cost is too high, which makes the cost performance very unsatisfactory, making people discouraged.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-efficiency preparation process of silica airgel, specifically comprising the following steps:

[0031] (1) Preparation of wet gel:

[0032] ① Take the refined sodium silicate and put it in a tank that is more than 4 times the volume of sodium silicate, then measure neutral water that is 4 times the volume of sodium silicate and add it to the tank, stir well to obtain a water glass solution, the modulus of the water glass solution 3 or so, the concentration is 37°;

[0033] ②Preparation of coagulant: weigh hydrochloric acid and adjust it to 4mol / L dilute hydrochloric acid to obtain coagulant for subsequent use;

[0034] (2) Gel process: drop the coagulant prepared in step ② into the uniformly stirred water glass solution in step ①, and stir fully while adding it. The amount of coagulant: add 7ml of dilute Hydrochloric acid solution, adjust the pH value of the mixture in the tank to 10, the solution starts to gel in about 10 minutes, and then aged at a constant t...

Embodiment 2

[0043] A high-efficiency preparation process of silica airgel, specifically comprising the following steps:

[0044] (1) Preparation of wet gel:

[0045] ① Take the refined sodium silicate and put it in a tank that is more than 8 times the volume of sodium silicate, then measure neutral water that is 4 times the volume of sodium silicate and add it to the tank, stir well to obtain a water glass solution, the modulus of the water glass solution 3 or so, the concentration is 37°;

[0046] ② Preparation of coagulant: weigh hydrochloric acid, adjust it into 5mol / L dilute hydrochloric acid, obtain coagulant, and set aside;

[0047] (2) Gel process: drop the coagulant prepared in step ② into the uniformly stirred water glass solution in step ①, and stir fully while adding the coagulant. The amount of coagulant: add 7.5ml Dilute hydrochloric acid solution, adjust the pH value of the mixture in the tank to 10, the solution starts to gel in about 10 minutes, and then age at a constant ...

Embodiment 3

[0056] A high-efficiency preparation process of silica airgel, specifically comprising the following steps:

[0057] (1) Preparation of wet gel:

[0058] ① Take the refined sodium silicate and put it in a tank that is more than 5 times the volume of sodium silicate, then measure neutral water that is 4 times the volume of sodium silicate and add it to the tank, stir well to obtain a water glass solution, the modulus of the water glass solution 3 or so, the concentration is 37°;

[0059] ②Preparation of coagulant: weigh hydrochloric acid, adjust it into 4.8mol / L dilute hydrochloric acid, obtain coagulant, and set aside;

[0060] (2) Gel process: drop the coagulant prepared in step ② into the uniformly stirred water glass solution in step ①, and stir fully while adding the coagulant. The amount of coagulant: add 7.2ml Dilute the hydrochloric acid solution, adjust the pH value of the mixture in the tank to 10, the solution starts to gel in about 10 minutes, and then age at a co...

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PUM

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Abstract

The invention discloses an efficient preparation technology of silicon dioxide areogel. The preparation technology includes the steps of 1), preparation of wet gel; 2), gel process; 3), sodium removal; 4), solvent substitution; 5), N-hexane substitution; 6), modification of silicon dioxide; 7), cleaning; 8), drying. In the technology, sodium silicate is taken as silicon source, the SiO2 areogel isprepared without ion exchange, many production processes and raw materials are reduced, production cost is lowered, product price of the silicone dioxide areogel can be effectively reduced, cost performance is more reasonable, and high environmental, social and economical values are achieved.

Description

technical field [0001] The invention relates to an airgel preparation technology, in particular to an efficient preparation process of silica airgel. Background technique [0002] Airgel, also known as xerogel. When most of the solvent is removed from the gel, so that the liquid content in the gel is much less than the solid content, or the space network structure of the gel is filled with gas, and the appearance is solid, this is xerogel, also called aerogels. Airgel also has the properties of gel, that is, it has swelling effect, thixotropy effect, and slurry effect. Airgel is one of the solids with very low density, with a density of 3 kilograms per cubic meter. The common airgel is silicon aerogel. [0003] In recent years, with the rapid economic development, more and more attention has been paid to energy conservation and environmental protection. Silica airgel, as the best thermal insulation material in the world, is also being paid more and more attention by peop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158B82Y40/00
Inventor 孙学峰
Owner 孙学峰
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