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Preparation method of foam reinforced SiO2-TiO2 composite aerogel

A technology of composite airgel and composite sol, which is applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve problems such as human injury and equipment corrosion, reduce thermal conductivity at room temperature, and improve high-temperature heat insulation The effect of performance and simple process

Inactive Publication Date: 2020-03-27
航天海鹰(镇江)特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, SiO is prepared by in situ generation method 2 -TiO 2 The airgel process is mainly a sol-gel process of "acid-base two-step catalysis method". During the preparation process of this process, strong acid-base reagents will cause certain corrosion to the equipment and certain damage to the human body.

Method used

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  • Preparation method of foam reinforced SiO2-TiO2 composite aerogel

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example 1

[0026] This embodiment is to prepare foam reinforced SiO 2 -TiO 2 Composite airgel. Add 10g of tetrabutyl titanate (TBOT) and 10g of tetrabutyl titanate (TBOT) into the beaker, and then add 56g of absolute ethanol into the beaker, stir at 500r / min for 20min; then use an electronic balance to weigh Take 2.48g of deionized water, slowly add it into the above mixed solution with a dropper, and continue stirring for 15min; then weigh 1g of 2mol / L ammonium fluoride solution, add it dropwise into the solution with a dropper, and then After stirring at 200r / min for 1min, SiO was obtained 2 -TiO 2 Composite sol. Thickness 1mm, density 15Kg / m 3 Put the melamine foam into a mold container, pour the prepared composite sol into it, the sol is submerged in the melamine foam, and then cover the mold with plastic wrap and wait for the sol to form a gel. The gel time is about 30 minutes, and you can get Foam reinforced SiO 2 -TiO 2 Composite airgel samples. Then the prepared foam rei...

example 2

[0028] This embodiment is to prepare foam reinforced SiO 2 -TiO 2Composite airgel. Add 10g of tetrabutyl titanate (TBOT) and 10g of tetrabutyl titanate (TBOT) into the beaker, and then add 39g of absolute ethanol into the beaker, stir at 500r / min for 20min; then use an electronic balance to weigh Take 2.48g of deionized water, slowly add it into the above mixed solution with a dropper, and continue stirring for 15min; then weigh 1.5g of 2mol / L ammonium fluoride solution, and add it dropwise into the solution with a dropper, After stirring at a speed of 200r / min for 1min, SiO 2 -TiO 2 Composite sol. Thickness 2mm, density 20Kg / m 3 Put the melamine foam into a mold container, pour the prepared composite sol into it, the sol is submerged in the melamine foam, and then cover the mold with plastic wrap and wait for the sol to form a gel. The gel time is about 40 minutes, and you can get Foam reinforced SiO 2 -TiO 2 Composite airgel samples. Then the prepared foam reinforce...

example 3

[0030] This embodiment is to prepare foam reinforced SiO 2 -TiO 2 Composite airgel. Add 10g tetrabutyl titanate (TBOT) and 10g tetrabutyl titanate (TBOT) to the beaker, mix and then add 28.5g absolute ethanol to the beaker, stir at a speed of 500r / min for 20min; then use an electronic balance Weigh 2.48g of deionized water, slowly add it into the above mixed solution with a dropper, and continue stirring for 15min; then weigh 2g of 2mol / L ammonium fluoride solution, and add it dropwise into the solution with a dropper, After stirring at a speed of 200r / min for 1min, SiO 2 -TiO 2 Composite sol. Thickness 3mm, density 15Kg / m 3 Put the melamine foam into a mold container, pour the prepared composite sol into it, the sol is submerged in the melamine foam, and then cover the mold with plastic wrap and wait for the sol to form a gel. The gel time is about 45 minutes, and you can get Foam reinforced SiO 2 -TiO 2 Composite airgel samples. Then the prepared foam reinforced SiO...

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Abstract

The invention discloses a preparation method of foam reinforced SiO2-TiO2 composite aerogel. The preparation method comprises the steps: mixing tetraethyl orthosilicate and tetrabutyl titanate according to a certain proportion; sequentially adding absolute ethyl alcohol and deionized water, stirring, adding a catalyst after a period of time, dipping foam into the prepared SiO2-TiO2 colloidal solution, gelling and aging, and finally performing supercritical drying. The catalyst is only used once when the SiO2-TiO2 composite sol is prepared, so that the foam reinforced SiO2-TiO2 composite aerogel is prepared by a 'one-step catalytic method'. Moreover, TiO2 in the composite aerogel prepared by the method disclosed by the invention has excellent shading performance, and has a heat radiation prevention effect while insulating heat, so that the high-temperature heat conductivity of the aerogel can be effectively reduced. Meanwhile, the foam is used as a reinforcing body, so that the defect that the SiO2-TiO2 aerogel is fragile can be effectively overcome. Tests show that the normal-temperature thermal conductivity of the prepared foam reinforced SiO2-TiO2 composite aerogel is less than or equal to 0.015 W / (m*K).

Description

technical field [0001] The invention relates to a foam reinforced SiO 2 -TiO 2 Preparation method of composite airgel. Background technique [0002] SiO 2 Airgel material is currently the material with the best thermal insulation performance, but as the temperature continues to rise, its effect of preventing heat radiation is relatively poor. Nano-TiO 2 As an infrared sunscreen with excellent performance, it can effectively shield the heat of radiation, thereby improving the SiO 2 High-temperature thermal insulation properties of airgel. Currently, SiO 2 -TiO 2 The preparation methods of airgel are mainly doping method and in situ generation method. Doping method is to TiO 2 Nanoparticles are added to SiO2 sol, but the SiO prepared by this method 2 -TiO 2 Airgel with TiO 2 Nanoparticles are prone to agglomeration and uneven distribution. In situ generation method is to convert TiO 2 The precursor is added to the SiO in the form of a solution 2 In the sol, the S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 吴锦源殷龙盘景峰崔恒律秦德勇王文斌华文龙
Owner 航天海鹰(镇江)特种材料有限公司
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