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Light heat-insulation noise-reduction SiO2 aerogel material and preparation method thereof

A light-weight heat insulation and airgel technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of poor transparency, high thermal conductivity and high density of airgel, and achieve safety in the production process Controllable, low thermal conductivity, and reduced replacement times

Inactive Publication Date: 2019-09-20
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes a trifunctional silicon source, although its preparation process is relatively simple, but the prepared airgel has the disadvantages of poor transparency, high thermal conductivity and high density

Method used

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  • Light heat-insulation noise-reduction SiO2 aerogel material and preparation method thereof
  • Light heat-insulation noise-reduction SiO2 aerogel material and preparation method thereof
  • Light heat-insulation noise-reduction SiO2 aerogel material and preparation method thereof

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preparation example Construction

[0046] The invention discloses a lightweight heat-insulating and noise-reducing SiO 2 The preparation method of airgel material, it comprises the steps:

[0047] 1) Prepare micelles or microemulsions: add 30mL deionized water to a beaker, add an acidic catalyst to make the solution pH = 3-4, stir for 5 minutes, add 0.1-5g cationic surfactant, and stir for 20-60 minutes;

[0048] 2) Preparation of sol: according to the volume ratio of silicon source and deionized water as 1: (0.5 ~ 6), add trifunctional silicon source, continue stirring at room temperature for 3 ~ 5 hours, and then add a certain amount of molar concentration of 1 ~ 6.5mol / L ammonia water until the pH of the solution is 7~8, and continue to stir for 0.5~1h;

[0049] 3) Aging and replacement: Aging the wet gel at 40-80°C for two days, then replacing it with deionized water for 8-12 hours in a water bath at 40-80°C, and adding molar concentration of 1-6.5mol / L during the replacement Ammonia water until the pH o...

Embodiment 1

[0053] Add 30mL deionized water to the beaker, then add acetic acid to make the solution pH=3~4, stir for five minutes, add 0.4g cetyltrimethylammonium bromide CTAB, stir for 20min, then add 7.5mL methyl triethyl ammonium bromide Oxysilane MTES, continue to stir at room temperature for 3h. Then add a certain amount of ammonia water with a molar concentration of 1 mol / L until the pH of the solution is 7, continue stirring for 1 hour, and gel in a water bath at 60°C. The wet gel was aged at 60°C for two days, and then replaced with deionized water in a water bath at 60°C for 8 hours. During the replacement, ammonia water with a molar concentration of 1mol / L was added to the pH of the solution to 9-10 to remove surfactants and other Unreacted material. After replacement, replace with ethanol 3 times at room temperature, 12 hours each time. Finally with CO 2 SiO obtained by supercritical drying 2 airgel.

Embodiment 2

[0055] Add 30mL deionized water to the beaker, then add acetic acid to make the solution pH=3~4, stir for five minutes, add 0.2g cetyltrimethylammonium bromide CTAB, stir for 20min, then add 7.5mL methyl triethyl ammonium bromide Oxysilane MTES, continue to stir at room temperature for 3h. Then add a certain amount of ammonia water with a molar concentration of 1 mol / L until the pH of the solution is 7, continue stirring for 1 hour, and gel in a water bath at 60°C. The wet gel was aged at 60°C for two days, and then replaced with deionized water in a water bath at 60°C for 8 hours. During the replacement, ammonia water with a molar concentration of 1mol / L was added to the pH of the solution to 9-10 to remove surfactants and other Unreacted material. After replacement, replace with ethanol 3 times at room temperature, 12 hours each time. Finally with CO 2 SiO obtained by supercritical drying 2 airgel.

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Abstract

The invention discloses a light heat-insulation noise-reduction SiO2 aerogel material and a preparation method thereof, and belongs to the technical field of high-performance porous materials. The preparation method comprises the following steps: carrying out an acid-base two-step method and standing replacement on a trifunctional silicon source and a cationic surfactant in a water solvent to obtain an aerogel material; wherein the molecule of the trifunctional silicon source comprises a non-polar group which does not participate in hydrolytic condensation and three alkoxy groups which participate in the hydrolytic condensation. In the preparation method designed by the invention, water is used as a solvent, a surfactant is added to reduce the surface tension of the solvent, and an ordered assembly is formed in an aqueous solution to provide a micro-reaction container for a hydrophobic trifunctional silicon source; therefore, the prepared SiO2 aerogel material has the advantages of low density, low heat conductivity coefficient, high transparency and the like.

Description

technical field [0001] The invention relates to airgel materials, which belong to the technical field of high-performance porous materials, and in particular to a lightweight heat-insulating and noise-reducing SiO 2 Airgel materials and methods for their preparation. Background technique [0002] Airgel is a new type of super thermal insulation material composed of three-dimensional nano-network, which has the characteristics of low density, low thermal conductivity, high specific surface area and high porosity. , aerospace and other fields have broad application prospects. [0003] Aerogels are usually prepared using sol-gel technology and supercritical drying technology using tetrafunctional silicon sources and alcohol solvents as raw materials. The airgel prepared in this way has poor mechanical properties and is hydrophilic, so it is difficult to be applied in engineering practice. With the development of gel technology, the mechanical properties of flexible aerogels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2004/03
Inventor 杨自春李肖华李昆峰陈国兵赵爽费志方张震
Owner NAVAL UNIV OF ENG PLA
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