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Preparation method of low-density SiO2 aerogel/sponge composite material

A composite material and low-density technology, which is applied in the field of preparing low-density SiO2 aerogel/sponge composite materials, can solve the problems of poor shock absorption and sound insulation performance of sponge, and achieve high porosity, simple operation steps, and pore size structure. uniform effect

Inactive Publication Date: 2014-03-26
NANJING TIANYIN ADVANCED MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sound-absorbing sponge is used as a sound-absorbing material. Although the price is low, the shock absorption and sound insulation performance of the sponge is poor.

Method used

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  • Preparation method of low-density SiO2 aerogel/sponge composite material
  • Preparation method of low-density SiO2 aerogel/sponge composite material
  • Preparation method of low-density SiO2 aerogel/sponge composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Heat a mixed solution of 22.3ml tetraethyl orthosilicate, 94ml absolute ethanol, 5.4ml deionized water, 5ml formamide and 0.3ml hydrochloric acid (1mol / L) as a catalyst at 50°C with constant stirring for 90min Finally, add ammonia water to adjust the pH value to about 6.5, and continue to stir for 5 minutes; pour the mixed solution into a mold with a sponge, let it stand at room temperature to obtain a wet gel, and then put the wet gel into a 60°C oven for use Anhydrous ethanol was used for solvent replacement, which was replaced every 12 hours for a total of 4 times. After the replacement was completed, the CO 2 Low-density SiO can be prepared by supercritical drying under ambient conditions 2 Airgel / sponge composites. prepared low-density SiO 2 The scanning electron microscope photos of the airgel / sponge composite samples are attached figure 1 shown, and the density of the composite material is 0.103g / cm 3 .

Embodiment 2

[0029] Heat the mixed solution of 67.2ml tetraethyl orthosilicate, 285ml absolute ethanol, 16ml deionized water, 15ml formamide and 0.9ml hydrochloric acid (1mol / L) as catalyst at 45°C and keep stirring, after 100min Add ammonia water to adjust the pH value to about 8, and continue to stir for 8 minutes; dilute the mixed solution with absolute ethanol, and dilute the absolute ethanol and silicon solution according to the volume ratio of 1:1, 2:1, and 3:1 respectively. The final mixed solutions were then poured into molds with sponges, and left to stand at room temperature to obtain wet gels. Then, the wet gels were placed in an oven at 55°C and replaced with absolute ethanol every 12 hours. Replacement 4 times, after replacement in CO 2 Low-density SiO can be prepared by supercritical drying under ambient conditions 2 Airgel / sponge composites. prepared low-density SiO 2 The pore size distribution of the airgel / sponge composite samples is shown in the attached figure 1 show...

Embodiment 3

[0031] Heat a mixed solution of 67.2ml tetraethyl orthosilicate, 285ml absolute ethanol, 17ml deionized water, 15ml formamide and 1ml hydrochloric acid (1mol / L) as a catalyst at 55°C with constant stirring, add ammonia water after 85min Adjust the pH value to about 8, and continue to stir for 5 minutes; dilute the mixed solution with acetonitrile, and dilute the acetonitrile and silicon solutions according to the volume ratio of 1:1, 2:1, and 3:1, and then dilute the mixed solution. Pour them into molds with sponges respectively, stand at room temperature to obtain wet gels, and then put the wet gels into a 65°C oven for solvent replacement with absolute ethanol, once every 8 hours, a total of 7 replacements, replacement After completion in CO 2 Low-density SiO can be prepared by supercritical drying under ambient conditions 2 Airgel / sponge composites. prepared low-density SiO 2 The frequency curve of the sound absorption coefficient of the airgel / sponge composite sample is...

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Abstract

The invention discloses a preparation method of a low-density SiO2 aerogel / sponge composite material. The preparation method is characterized by comprising the following steps: (a) mixing a silicon source, absolute ethyl alcohol, deionized water and formamide according to the molar ratio of 1:(10-20):(2-7):(1-3), and then adding an acid catalyst of which the molar ratio to the silicon source is (0.001-0.01):1; adding alkali liquor to adjust the pH value after fully stirring and hydrolyzing at 0-60 DEG C; (b) taking a mixed solution in the step (a) into a mold containing sponge, standing to obtain wet gel; (c) replacing a solvent of the wet gel for 3-8 times by adopting absolute ethyl alcohol, wherein each replacement time is 8-24 hours, and carrying out supercritical drying under the environment of CO2 after replacement is finished, so as to prepare the low-density SiO2 aerogel / sponge composite material.

Description

technical field [0001] The invention relates to the field of preparation technology of airgel materials, specifically a two-step sol-gel method combined with CO 2 Preparation of Low Density SiO by Supercritical Drying 2 Preparation method of airgel / sponge composite. Background technique [0002] SiO 2 Airgel is a nanoporous network solid amorphous material composed of colloidal particles or polymer molecules. It has excellent characteristics such as low thermal conductivity, high specific surface area, low density and high porosity. It can be used as heat insulation material, sound insulation material, filter material and adsorption material, etc. Sound-absorbing sponge is used as a sound-absorbing material. Although the price is low, the shock absorption and sound insulation performance of the sponge is poor. Strong water absorption capacity, easy to absorb dust. Therefore, it will be a new attempt to prepare airgel composites with low density and good sound insulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/28C08J7/02C08L75/04C08K7/26
Inventor 崔升周丹滕凯明周小芳
Owner NANJING TIANYIN ADVANCED MATERIAL TECH
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