SiO2 nanoscale porous material with aerogel property prepared by microwave reaction and preparation method thereof

A porous material, microwave reaction technology, applied in the fields of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of high manufacturing cost and low strength, and achieve the effect of reducing production cost, large specific surface area, and high strength

Inactive Publication Date: 2010-01-27
郑文芝 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to overcome the disadvantages of low strength and high manufacturing cost of existing silica aerogels, and provide a

Method used

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  • SiO2 nanoscale porous material with aerogel property prepared by microwave reaction and preparation method thereof
  • SiO2 nanoscale porous material with aerogel property prepared by microwave reaction and preparation method thereof
  • SiO2 nanoscale porous material with aerogel property prepared by microwave reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: SiO with airgel properties prepared by microwave irradiation of silica sol 2 nanoporous materials

[0039] According to the technical scheme of the present invention, organic siloxane, organic solvent, water, and acid catalyst are used as raw materials to manufacture the microwave-reactive SiO with airgel properties of the present invention. 2 nanoporous materials. in:

[0040] Organosiloxane is selected from: methyl orthosilicate (Tetramethoxysilane), orthosilicate ethyl (Tetraethoxysilane), methyltriethoxysilane (Methyltriethoxysilane), methyltrimethoxysilane (Methyltrimethoxysilane), dimethyldimethoxysilane Dimethyldiethoxysilane, Aminopropyltriethoxysilane, N-octyltriethoxysilane, Polydimethylsiloxane Polydiethoxysilane Oxane (Polydiethoxysiloxane), polyethoxysilane (Polyethoxydisiloxane), perfluoroalkylsiloxane (Perfluoroaklysilane), etc.

[0041] The organic solvent is selected from lower alcohols such as methanol, ethanol, propanol, butanol, or n-h...

Embodiment 2

[0054] Example 2: SiO with airgel properties prepared by synchronous reflection of mixing and microwave irradiation 2 nanoporous materials

[0055] This example is basically the same as Example 1, except that the four components of organosiloxane, organic solvent, water, and acid catalyst are stirred and mixed in a microwave reactor while irradiating with microwaves, and after the reaction The silica sol irradiated by microwave is obtained directly. A base catalyst is added to obtain a silica wet gel. Then aging with absolute ethanol for 24 hours, and drying at normal pressure to obtain a transparent massive solid, that is, the SiO with airgel properties prepared by the microwave reaction of the present invention. 2 nanoporous materials.

[0056] Specifically, tetraethyl orthosilicate, ethanol, and water should be mixed according to a molar ratio of 1:4:4, and an appropriate amount of hydrochloric acid is added to adjust the pH value of the mixed solution to pH = 4.6, and t...

Embodiment 3

[0059] Embodiment 3: Effect of Microwave Irradiation Process on Specific Surface Area

[0060]The technical solution of this embodiment is basically the same as that of Embodiment 1, except that the parameters of the microwave irradiation process are different. The main raw material is Tetraethoxysilane for organosiloxane, ethanol for organic solvent, sulfuric acid for acid catalyst, and distilled water for water. See Table 1 for the specific ratio of "organosiloxane:organic solvent:water" of the components of the ingredients. Add an appropriate amount of sulfuric acid to adjust the pH of the mixture to pH=5. The total volume of the mixed solution is 150ml, and the power of the microwave reactor is set at 300W. The experimental results are shown in Table 1. The results of this experiment show that different microwave irradiation processes have obtained SiO with airgel characteristics prepared by the microwave reaction of the present invention with different specific surface ...

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Abstract

The invention provides a SiO2 nanoscale porous material with aerogel property prepared by microwave reaction and a preparation method thereof; the nanoscale porous material comprises silicon dioxide skeletons (1) and bubble-shaped nanoscale pores (2), wherein the foam-shaped nanoscale pores (2) are arranged among the silicon dioxide skeletons (1). The preparation method comprises four steps, namely preparation of silicon dioxide sol, preparation of wet gel, aging of mother solution and drying at normal pressure and the preparation of silicon dioxide sol comprises the following steps: adopting organosiloxane, organic solvent, water and acid catalysis as raw materials; mixing each components in a defined ratio in a container while adopting microwave radiation to perform hydrolytic polycondensation reaction or adopting microwave radiation to perform hydrolytic polycondensation reaction after mixing the components. Owning to adopting microwave radiation technology, a lot of bubbles are generated in silicon dioxide sol, a large quantity of nanoscale bubble-shaped pores are formed on the silicon dioxide substrate, and meanwhile silicon dioxide space skeletons are retained so that silicon dioxide porous material with extremely large specific area and higher intensity can be obtained. In addition, because carbon dioxide supercritical drying process is not needed, the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a preparation process of porous silicon dioxide material and the preparation process, which belongs to the field of preparation of functional materials. Background technique [0002] SiO 2 Airgel is a new type of nanoporous super heat insulation material, which has powder and block shapes. It is a low-density nanoporous amorphous material. Its typical structure is composed of nanoscale spherical particles stacked together. There are gaps between (refer to Figure 1 to Figure 4 , Image 6 ). Since silica airgel contains nanoscale particles and pore structures (1-100nm), the size of the solid-state network structure unit is 1-200nm, and the typical pore size is 1-100nm, which has a large specific surface area (500-1200m 2 / g), very high porosity (80% ~ 99.8%), very low density (1 ~ 500kg / m 3 ) and very low thermal conductivity (0.02Wm -1 k -1 ) and other characteristics, it shows unique properties in mechanics, acoustics, h...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82B3/00
Inventor 郑文芝曹旭光周星
Owner 郑文芝
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