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Preparation method of flexible silicon dioxide aerosol

A silica and aerogel technology, applied in the direction of silica, silica, etc., can solve the problems of performance impact, low thermal stability temperature of samples, etc.

Inactive Publication Date: 2014-10-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal stability temperature of the sample prepared by this method is relatively low, about 260°C. Above this temperature, the sample turns into a hydrophilic aerogel, and the performance will be significantly affected [A.V.Rao.S.D.Bhagat, H.Hirashima, et al. Journal of Colliod and Interface Science, 2006, 300, 279-285]

Method used

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  • Preparation method of flexible silicon dioxide aerosol
  • Preparation method of flexible silicon dioxide aerosol

Examples

Experimental program
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Effect test

Embodiment 1

[0017] According to the atomic molar ratio of 1:13, 4ml of methyltriethoxysilane, 11.2ml of methanol, and 1.30ml of oxalic acid solution with a molar concentration of 0mol / L were measured according to the atomic molar ratio of 1:4, and the reaction system was mixed evenly by magnetic stirring for 30min. Let stand for 12h. According to the mass ratio of methyltriethoxysilane and hydroxyl-terminated polydimethylsiloxane 1:0.025, add 0.09ml of hydroxyl-terminated polydimethylsiloxane, and then add methyltriethoxysilane and ammonia atom Add 13.36mol / L ammonia solution at a molar ratio of 1:4 and stir for 30 min to form a silica sol.

[0018] Let the silica sol stand at room temperature until the gel is formed, age the gel at 60°C for 2 days, wash and replace it with ethanol 5 times during this period, and dry the sample with supercritical fluid to obtain silica airgel .

[0019] as attached figure 1 As shown in the scanning electron microscope (SEM) image, the obtained elastic ...

Embodiment 2

[0021] Measure 6ml of methyltriethoxysilane, 22.4ml of methanol according to the atomic molar ratio of 1:19.5, and 1.96ml of oxalic acid solution with a molar concentration of 0.001mol / L according to the atomic molar ratio of 1:4, and magnetically stir for 30 minutes to make the reaction system mix evenly , let stand for 24h. According to the mass ratio of methyltriethoxysilane and hydroxyl-terminated polydimethylsiloxane 1:0.05, add 0.27ml of hydroxyl-terminated polydimethylsiloxane, and then add methyltriethoxysilane and ammonia atom Add 10mol / L ammonia solution at a molar ratio of 1:4 and stir for 30min to form a silica sol.

[0022] Leave the silica sol at room temperature until the gel is formed, age the gel at 40°C for 3 days, wash and replace it with methanol 7 times during this period, and dry the sample with supercritical fluid to obtain silica aerogel .

Embodiment 3

[0024] According to the atomic molar ratio of 1:26, 4ml of methyltriethoxysilane, 22.4ml of methanol, and 1.30ml of oxalic acid solution with a molar concentration of 0.01mol / L were measured according to the atomic molar ratio of 1:4, and the reaction system was mixed evenly by magnetic stirring for 30 minutes. , let stand for 36h. According to the mass ratio of methyltriethoxysilane and hydroxyl-terminated polydimethylsiloxane 1:0.075, add 0.27ml of hydroxyl-terminated polydimethylsiloxane, and then add methyltriethoxysilane and ammonia atom Add 8 mol / L ammonia solution at a molar ratio of 1:4, stir for 30 min to form a silica sol.

[0025] Leave the silica sol at room temperature until the gel is formed, age the gel at 40°C for 3 days, wash and replace it with methanol 7 times during this period, and dry the sample with supercritical fluid to obtain silica aerogel .

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Abstract

The invention relates to a preparation method of a flexible silicon dioxide aerosol. The preparation method comprises the following steps: taking methyl triethoxysilane as the precursor, methanol as the reaction solvent, and oxalic acid and ammonia water as the reaction catalyst, adding hydroxy-terminated polydimethylsiloxane during the reaction process, and finally carrying out a supercritical fluid drying technology so as to obtain silicon dioxide aerosol blocks with excellent elasticity. The prepared silicon dioxide aerosol sample has a density of 0.06 g / cm3, a specific surface area of around 395 m2 / g, an elasticity modulus of 2.39*10<4> N / m2 to 4.82*10<4>N / m2, and a hydrophobic angle of 158 degrees. Compared to the ordinary silicon dioxide aerogel, the flexible silicon dioxide aerosol can bear a higher temperature and has more stable properties. The application range of aerosol is enlarged due to the excellent elasticity, and the flexible silicon dioxide aerosol can be applied to fields such as damping, heat insulation, sound insulation, and the like.

Description

technical field [0001] The invention relates to a method for preparing elastic silicon dioxide airgel, in particular to a method for preparing silicon dioxide airgel with excellent elasticity. Background technique [0002] Aerogel is a light, porous solid material with a particle size between 1-100nm, a typical nanomaterial, and its porosity can reach 80-99.8%. Due to the specific porous nano-network structure of airgel, it has incomparable excellent performance of other solid materials, and its density can reach as low as 3kg / m 3 , the specific surface area can reach 1000m 2 / g or more, the thermal conductivity is extremely low, and the vacuum thermal conductivity at room temperature can even reach 0.00lw m ‐1 ·K ‐1 , These excellent properties of airgel make it widely used in heat insulation, sound insulation, environmental protection, catalysis, adsorption and high-performance capacitors. [0003] The preparation of silica airgel generally uses organosilicon precursor...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 陈晓红杨万吉宋怀河胡子君
Owner BEIJING UNIV OF CHEM TECH
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