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A silica and aerogel technology, applied in the direction of silica, silica, etc., can solve the problems of slow reaction speed and easy shrinkage and cracking of airgel drying, so as to reduce the cost of raw materials, increase the reaction speed, reduce the The effect of the conditions required for the reaction
Inactive Publication Date: 2010-10-20
应城市东诚有机硅有限公司
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Problems solved by technology
[0006] Purpose of the present invention is exactly at the defective of prior art, a kind of preparation method of silica airgel is provided, and it solves the problem of SiO 2 Airgel is prone to shrinkage cracking and slow response when drying
Method used
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Embodiment l
[0014] Add 50ml of silicon tetrachloride and 100ml of water into a 500ml three-necked flask with a stirrer, adjust the pH value to 3 with dilute hydrochloric acid, stir well, and react for 1h; then add ammonia water to adjust the pH value to 8, add 150ml of water and 50ml of ethanol, stir to form a gel, then extract, remove the contained water / alcohol mixture, take the gel, add 100ml of absolute ethanol, add 100ml of trimethylchlorosilane, 100ml of heptane, and soak for 3 hours. Put it into a test tube, then seal it with aluminum foil with pinholes, and put it in an oven for normal pressure drying to obtain SiO 2 airgel.
Embodiment 2
[0016] Add 50ml of silicon tetrachloride and 100ml of water into a 500ml three-necked flask with a stirrer, adjust the pH value to 4 with dilute hydrochloric acid, stir well, and react for 1h; then add ammonia water to adjust the pH value to 9, add 150ml of water and 50ml of ethanol, stir to form a gel, then extract, remove the contained water / alcohol mixture, take the gel, add 100ml of anhydrous methanol, add 80ml of trimethylchlorosilane, 100ml of n-hexane, and soak for 3 hours. Put it into a test tube, then seal it with aluminum foil with pinholes, and put it in an oven for normal pressure drying to obtain SiO 2 airgel.
Embodiment 3
[0018] Add 50ml of silicon tetrachloride and 100ml of water into a 500ml three-necked flask with a stirrer, adjust the pH value to 5 with dilute hydrochloric acid, stir well, and react for 1h; then add ammonia water to adjust the pH value to 10, add 150ml of water and 50ml of ethanol, stir to form a gel, then extract, remove the contained water / alcohol mixture, take the gel, add 100ml of absolute ethanol, add 50ml of trimethylchlorosilane, 80ml of heptane, and soak for 3 hours. Put it into a test tube, then seal it with aluminum foil with pinholes, and put it in an oven for normal pressure drying to obtain SiO 2 airgel.
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Abstract
The invention relates to a preparation method for silicon dioxide aerogel. The method includes the following steps: (1) under the acidic condition that pH is equal to 3 to 5, stirring silicon tetrachloride and water for reaction, then adding ammonia water to regulate pH to 8 to 10, adding water and ethanol, and after hydrolytic polycondensation reaction, forming alcogel; (2) carrying out extraction, and removing water / alcohol mixture contained in the alcogel; taking gel solution, adding anhydrous methanol or ethanol, and replacing the water / alcohol mixture in gel pores with the anhydrous methanol or ethanol; (3) adding trimethyl chlorosilane and alkane to alkylate Si-OH on the surface of the gel skeleton, and after drying under the normal pressure, the SiO2 aerogel is produced. The invention has the following advantages that: (1) since the silicon tetrachloride as byproduct produced in a large amount by the organosilicon industry is used as raw material, the material cost in the process of production is greatly reduced; (2) compared with the conventional supercritical drying, the adopted normal-temperature drying can greatly reduce conditions needed by reaction; and (3) the invention cannot destroy the nanopore structure of the SiO2 aerogel, and can stably increase the reaction speed at the same time.
Description
technical field [0001] The present invention relates to a kind of preparation method of silicon dioxide airgel, specifically a kind of use silicon tetrachloride as starting material, use organic solvent to alkylate the Si-OH on the surface of the gel skeleton, and then dry it so that Process for preparing silica aerogels. Background technique [0002] Silica aerogel has the characteristics of low density, large specific surface area, and high porosity, and is a new type of lightweight nanoporous material with broad prospects. Making full use of the excellent properties of aerogels, realizing the low cost of raw materials and the simplicity, safety and low cost of the preparation process, so that it can be mass-produced is the current research hotspot. [0003] In recent years, research on silica aerogels has mainly focused on BASF and BESY in Germany, Los Alamos National Laboratory, Lawrence Livermore National Laboratory and Sandia National Laboratory in the United States, ...
Claims
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Application Information
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