Method for preparing silicon dioxide aerogel

A silica and aerogel technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of impure products, waste of water resources, wide particle size distribution, etc., to avoid washing steps and save water. resources, the effect of simplifying the production process

Active Publication Date: 2012-11-28
中亨新型材料科技有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, the technical problem to be solved by the present invention is to overcome the problems of product impurity, waste of water resources, and wide particle size distribution in the preparation of silica aerogels in the prior art, thereby providing a method for preparing silica airgel The method of airgel, the method is simple to operate, low in cost and can obtain silica airgel with higher purity and narrow particle size distribution

Method used

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  • Method for preparing silicon dioxide aerogel
  • Method for preparing silicon dioxide aerogel
  • Method for preparing silicon dioxide aerogel

Examples

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preparation example Construction

[0041](1) Preparation of silica sol:

[0042] Weigh the powder containing silicon dioxide (particle size 0.1-0.4 μm, mass percentage greater than 85%) and the powder containing calcium oxide according to the molar ratio of 1:0.8-1:1.2, after thorough grinding and mixing, Calcined at a temperature of ℃, and reacted for 15-100min to obtain the product;

[0043] Put the obtained sintered product into a sulfuric acid solution with a concentration of 3%-10%, fully stir and mix, react at room temperature-80°C for 20-80min, and adjust the pH value at 4 by adding sulfuric acid or sintered material -7, cooling the reacted mixed solution and suction filtering to remove the precipitate to obtain a silica sol;

[0044] (2) Preparation of silica gel:

[0045] Place the silica sol obtained in (1) at room temperature -50°C for 2-24 hours to form a gel state, and continue to place and age for 2-30 hours to obtain a silica gel;

[0046] (3) Solvent replacement:

[0047] The gel obtained ab...

Embodiment 1

[0054] (1) Preparation of silica sol: take microsilica powder 1000g (density is 150Kg / m 3 , the average particle size is 0.18μm), quicklime 900g, of which SiO 2 The molar ratio of CaO and CaO is 1:0.95. Put the two into the disperser, fully grind and mix for 10 minutes, then transfer the mixed material into a high-temperature reaction furnace, maintain the reaction temperature at 850±10°C, and keep stirring for 40 minutes to obtain sintering product;

[0055] Cool the obtained sintered product to a temperature of 50°C, then transfer all of it to a reaction kettle, inject 3200 mL of sulfuric acid solution with a concentration of 5% (mass concentration), and stir continuously at room temperature to allow it to fully react. After about 50 minutes, the sintered product Dissolve completely, and new precipitates appear continuously, add the sulfuric acid solution or the sintered product to adjust the pH of the reaction solution to 4, filter the mixed solution after the reaction, fi...

Embodiment 2

[0061] (1) Preparation of silica sol: take 1000g of microsilica fume (average particle size is 0.18μm), 950g of quicklime, of which SiO 2 The molar ratio to CaO is 1:1.01. Put the two into the disperser, fully grind and mix for 10 minutes, then transfer the mixed material into a high-temperature reaction furnace, maintain the reaction temperature at 800°C, and keep stirring for 50 minutes to obtain a sintered product;

[0062] Cool the obtained sintered product to a temperature of 50°C, then transfer all of it into a reaction kettle, inject 2000mL of sulfuric acid solution with a concentration of 8% (mass concentration), stir continuously at 40°C to make it fully react, and after about 30min, sinter The product is completely dissolved, and new precipitates appear constantly. Add the sulfuric acid solution or the sintered product to adjust the pH of the reaction solution to 4.5, filter the reaction mixed solution with suction, filter the precipitate, collect the filtrate, and ob...

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Abstract

The invention provides a method for preparing silicon dioxide aerogel. The method comprises the following steps of: preparing silicon dioxide sol by solid-solid reaction, preparing silicon dioxide gel, replacing a solution, performing surface modification treatment and drying under normal pressure. According to the method, the silicon dioxide aerogel which is few in impurities, high in purity and narrow in particle size distribution is prepared by taking superfine mineral powder of silicon micro powder, micro silicon powder, kieselguhr, vermiculite powder, sepiolite, a perlite filter aid and the like which are high in content of silicon dioxide, readily available, low in cost and light in mass as a raw material; and according to the preparation method, the production cost is low, and a production process is simple.

Description

technical field [0001] This article relates to a method for preparing silica airgel, to be exact, a method for preparing silica airgel by using inorganic silicon source and quicklime as raw materials. technical background [0002] Airgel is a form of solid matter, and it is one of the solids with the smallest density in the world. The common airgel is silicon-based aerogel, and the one involved in the present invention is silica aerogel. SiO 2 Airgel is a new inorganic material with a three-dimensional nanoporous network structure. The unique nanostructure enables it to integrate a variety of excellent properties, such as thermal insulation performance, good light transmission, and extremely high porosity. , Very low density, very low sound propagation velocity, very low dielectric constant, high specific surface area and so on. This so-called "miracle material that changes the world" is widely used in various fields such as aerospace, medicine, construction, industry, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
Inventor 刘相红
Owner 中亨新型材料科技有限公司
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