Method for preparing SiO2 aerogel heat insulating composite through adhesive slip casting

A technology of silicon dioxide and composite materials, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of restricting the large-scale popularization and application of bulk aerogel, high cost of aerogel preparation, and harsh condition control requirements. Excellent mechanical properties and mechanical properties, low cost, good safety effect

Inactive Publication Date: 2012-08-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this drying method can produce products with more stable quality, the supercritical drying process requires high-pressure equipment, and the condition control requirements are very harsh, so the preparation cost of airgel is expensive, which limits the large-scale application of block airgel ( CN 102225769A)

Method used

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  • Method for preparing SiO2 aerogel heat insulating composite through adhesive slip casting
  • Method for preparing SiO2 aerogel heat insulating composite through adhesive slip casting
  • Method for preparing SiO2 aerogel heat insulating composite through adhesive slip casting

Examples

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Embodiment 1

[0028] 1. Preparation of silica alcohol gel

[0029] Mix 10.38g ethyl orthosilicate, 5.34g methyltriethoxysilane, 5.40g deionized water, 34.5g absolute ethanol and 1.83g DMF (molar ratio 1:0.6:6:15:0.5) and stir Evenly, add hydrochloric acid to adjust the pH value to 3.5, stir and catalyze the hydrolysis reaction at room temperature for 24 hours, then add ammonia water to adjust the pH value to 6.5, continue to stir for 10 minutes and then stand still to obtain SiO 2 alcohol gel. SiO will be obtained 2 The alcohol gel was placed in a mixed solution of ethyl tetrasilicate and absolute ethanol (volume ratio 20:80) and aged at 50° C. for 50 hours.

[0030] 2. Preparation of silica airgel

[0031] to the aged SiO 2 Add n-hexane to the alcohol gel for solvent exchange, once a day, exchange three times, and then place it in 10vt% trimethylchlorosilane n-hexane solution for immersion for 48 hours. °C, 100 °C and 120 °C for 4 hours to obtain nano-sized SiO 2 Airgel powder.

[0...

Embodiment 2

[0039] The preparation method of this embodiment is the same as that of Example 1, except that the addition amount of methyltriethoxysilane in step 1 is 4.46g, and the addition amount of deionized water is 7.20g; the n-hexane of trimethylchlorosilane in step 2 The volume concentration of the solution is 5vt%; the mass of -NCO-terminated polyurethane in step 3 is 30% of the mass of the dehydrated phenolic resin, and the reaction time is 13 hours.

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Abstract

The invention discloses a method for preparing a SiO2 aerogel heat insulating composite through adhesive slip casting,.The method comprises the following steps of: firstly, drying at normal temperature and normal pressure by taking tetraethoxysilane and methyltriethoxysilane as a co-precursor, absolute ethyl alcohol as a reaction solvent and DMF (Dimethyl Formamide) as a drying chemical control additive to obtain a mesoporous nanometer SiO2 aerogel material with uniform pore diameter distribution; then, carrying out flexibility modification by utilizing a polyurethane elastomer to prepare modified phenolic resin glue serving as an adhesive; and preparing the SiO2 aerogel heat insulating composite by using a slip casting method. The mechanical property of the aerogel is improved, and therefore, the SiO2 aerogel material has favorable toughness and mechanical property while playing a heat insulating role.

Description

1. Technical field [0001] The invention relates to a method for preparing a silica airgel composite material, in particular to a method for preparing a silica airgel thermal insulation composite material by grouting an adhesive. 2. Background technology [0002] Silicon dioxide (SiO 2 ) airgel is a continuous three-dimensional network structure formed by the mutual aggregation of nano-scale particles. The pores are filled with air medium, a highly dispersed lightweight porous amorphous material, and has a large specific surface area, high porosity, low density, Due to its low refractive index and low thermal conductivity, it has broad application prospects in many fields such as sound impedance, thermal insulation, catalytic carrier, and aerospace. [0003] As the lightest solid material in the world, airgel is currently recognized as the solid material with the lowest thermal conductivity. At the same time, silica airgel also has a high service temperature, even at a high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/12C01B33/16
Inventor 史铁钧张明文听雷陈苏峰
Owner HEFEI UNIV OF TECH
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