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Method for rapid preparation of silicon oxide aerogel microspheres by ordinary pressure drying technology

An atmospheric drying and aerogel technology, applied in the directions of silicon oxide and silicon dioxide, can solve the problems of complex process and long time consumption, and achieve the effect of simple process, short time consumption and shortened preparation time.

Inactive Publication Date: 2014-08-06
景德镇新禾陶瓷材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is aimed at preparing SiO by normal pressure drying technology in the prior art 2 The method of airgel microspheres has complex process and time-consuming technical problems. The purpose is to provide a low-cost, simple process, short time-consuming and large-scale production of atmospheric pressure drying technology to prepare SiO 2 Airgel microspheres approach

Method used

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  • Method for rapid preparation of silicon oxide aerogel microspheres by ordinary pressure drying technology
  • Method for rapid preparation of silicon oxide aerogel microspheres by ordinary pressure drying technology
  • Method for rapid preparation of silicon oxide aerogel microspheres by ordinary pressure drying technology

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Embodiment 1

[0028] 1) Prepare a silicic acid solution. In 10mL industrial grade water glass (SiO 2 , 26%), add 25mL of deionized water, and stir well to obtain a diluted sodium silicate aqueous solution. Take 40mL of strongly acidic styrene cation exchange resin, add the above-mentioned diluted sodium silicate aqueous solution to it, stir for 20 minutes, let stand and remove the lower layer of cation exchange resin to obtain a silicic acid solution with pH=2. Subsequently, 2 mL of concentrated nitric acid was added to the silicic acid solution to obtain a strongly acidic silicic acid solution with pH=1.

[0029]2) Prepare a stable inverse emulsion system. Take 10mL of strong acidic silicic acid solution with pH=1, add it to 40mL of cyclohexane, then add 3mL of 0.2mol / L Span 80-cyclohexane solution, and turn the resulting mixture at 1600 rpm Stir for 30 minutes at low temperature to obtain a stable silicic acid solution / cyclohexane inverse emulsion system.

[0030] 3) Simultaneous gela...

Embodiment 2

[0034] 1) Prepare a silicic acid solution. In 10mL industrial grade water glass (SiO 2 , 26%), add 30mL of deionized water, and stir well to obtain a diluted sodium silicate aqueous solution. Take 40 mL of strongly acidic styrene cation exchange resin, add the above-mentioned diluted sodium silicate aqueous solution to it, stir for 15 minutes, let stand and remove the lower layer of cation exchange resin to obtain a silicic acid solution with pH=2.5. Subsequently, 2.5 mL of concentrated nitric acid was added to the silicic acid solution to obtain a strongly acidic silicic acid solution with pH=1.2.

[0035] 2) Prepare a stable inverse emulsion system. Take 10mL of the silicic acid solution prepared in step 1), add it to 40mL of n-hexane, then add 4mL of 0.2mol / L Span 80-n-hexane solution, and put the resulting mixture at a speed of 1800 rpm Stir for 30 minutes to obtain a stable silicic acid solution / n-hexane inverse emulsion system.

[0036] 3) Simultaneous gelation, modi...

Embodiment 3

[0039] 1) Prepare a silicic acid solution. In 10mL industrial grade water glass (SiO 2 , 26%), add 40mL of deionized water, and stir well to obtain a diluted sodium silicate aqueous solution. Take 50 mL of strongly acidic styrene cation exchange resin, add the above-mentioned diluted sodium silicate aqueous solution to it, stir for 15 minutes, let stand and remove the lower layer of cation exchange resin to obtain a silicic acid solution with pH=2.5. Subsequently, 2.5 mL of concentrated nitric acid was added to the silicic acid solution to obtain a strongly acidic silicic acid solution with pH=1.

[0040] 2) Prepare a stable inverse emulsion system. Take 10mL of the silicic acid solution prepared in step 1), add it to 80mL of cyclohexane, then add 3mL of 0.2mol / L Span 60-cyclohexane solution, and turn the resulting mixture at 1800 rpm Stirring at high speed for 30 minutes to obtain a stable silicic acid solution / cyclohexane inverse emulsion system.

[0041] 3) Simultaneous...

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Abstract

The invention discloses a method for rapid preparation of SiO2 aerogel microspheres by an ordinary pressure drying technology, and is characterized in that the method comprises the steps: A) under stirring and in a silicic acid aqueous solution / nonpolar solvent inverse emulsion system, adding a methyl silazane modified agent, continuing stirring, allowing to stand, and forming a water-nonpolar solvent double-phase layered system; B) collecting a white precipitate deposited at the bottom of a nonpolar solvent phase, carrying out washing and ordinary pressure drying on the white precipitate, and thus obtaining an SiO2 aerogel microsphere powder. The method is characterized in that the method takes cheap water glass as raw material, is simple in preparation process and short in consumed time, can prepare the SiO2 aerogel microspheres in 5-10 hours, and is convenient for large-scale production. The SiO2 aerogel microspheres prepared by the method have quite good spherical outer shape, the particle size is controllable in a range of 5-50 [mu]m, and an internal structure is a typical nano porous structure; and the SiO2 aerogel microspheres show a good hydrophobic characteristic, and can be applied in the fields of thermal insulation, chromatographic separation, catalysis, biology drug carrying and the like.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a method for rapidly preparing silica airgel microspheres. Background technique [0002] SiO 2 Aerogels are a typical class of nanoporous materials. SiO 2 Airgel is mainly composed of three-dimensional porous network and nanoparticle framework, and has the characteristics of high porosity and high specific surface area in structure. Therefore, SiO 2 Airgel materials exhibit characteristics such as low density, low thermal conductivity, and low dielectric constant in terms of performance. Currently, SiO 2 Aerogels have been widely used in the fields of heat insulation, dielectric layer, bio-drug loading, and space technology, and have been highly valued by material researchers. Currently, for SiO 2 The research on aerogels mainly focuses on airgel blocks and irregular-shaped powders. However, SiO 2 Airgel blocks have the disadvantage of being br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 高相东何朋李效民甘小燕
Owner 景德镇新禾陶瓷材料有限公司
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