Method for preparing SiO2 aerogel in normal pressure drying condition

An atmospheric drying and aerogel technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of difficult to obtain aerogel blocks, high production cost and high risk, achieve good integrity and reduce production costs , the effect of uniform texture

Inactive Publication Date: 2011-04-06
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The invention provides a method for preparing SiO by normal pressure drying 2 Airgel method; preparation of SiO by overcoming supercritical drying 2 The airgel method has the disadvantages of complex equipment, high production cost, and high risk, and the existing atmospheric drying process is not easy to obtain complete SiO 2 Disadvantages of Airgel Blocks

Method used

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  • Method for preparing SiO2 aerogel in normal pressure drying condition
  • Method for preparing SiO2 aerogel in normal pressure drying condition
  • Method for preparing SiO2 aerogel in normal pressure drying condition

Examples

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specific Embodiment approach 1

[0015] Specific implementation mode 1: SiO is prepared by normal pressure drying in this implementation mode 2 The method of airgel is to carry out as follows: one, carry out hydrolysis reaction 48h after mixing ethyl orthosilicate, dehydrated alcohol, oxalic acid and water, wherein the mol ratio of ethyl orthosilicate and water is 1: 1. The molar ratio of ethyl orthosilicate to absolute ethanol is 1:7, and the molar ratio of ethyl orthosilicate to oxalic acid is 1:9×10 -4 ; 2. Add water, N, N-dimethylformamide and ammonia water, and let it stand for 36 hours to obtain a gel; 3. Place the gel prepared in step 2 in a drying oven at 20-60°C for 2-6 hours, and then Put it in an aqueous solution with a volume concentration of 80% ethanol, aging at 40-60°C for 12-24 hours, and then put it in a mixed solution of tetraethyl orthosilicate and ethanol with a volume ratio of 1:5, at 40-60°C Aging treatment under conditions for 12-24 hours; 4. Put the aged gel in isopropanol for solvent...

specific Embodiment approach 2

[0017] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the drying temperature in Step 3 is 30-50°C. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0018] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the drying temperature in step 3 is 40°C. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a method for preparing SiO2 aerogel in normal pressure drying condition, and relates to a preparation method of SiO2 aerogel. The preparation method overcomes the defects of complex devices, high production cost and high hazard existing in the method for preparing SiO2 aerogel in the supercritical drying condition and the defect that a complete SiO2 aerogel block is not easily obtained by the existing normal pressure drying technology. The preparation method of SiO2 aerogel comprises the following steps: obtaining SiO2 aerogel after sol-gel, ageing, solvent displacement, surface decoration, washing and drying processing. The method is characterized by low cost, low requirements on devices, good safety and the like. The SiO2 aerogel prepared by the method has uniformblock quality, good completeness, 90%-95% of gas hole ratio, low thermal conductivity, and is hydrophobing.

Description

technical field [0001] The present invention relates to a SiO 2 Airgel preparation method. Background technique [0002] SiO 2 Aerogels were first prepared by supercritical drying in the early 1930s, used as storage materials for liquid fuels in the 1960s, and used in large deep space probes in the early 1980s. Since then, they have received extensive attention. It has a series of special properties such as low density, high specific surface area, high porosity, low thermal conductivity, low acoustic wave propagation velocity and low dielectric constant, and is displayed in acoustics, mechanics, heat, optics, electricity and catalysis. It has unique value, such as dielectric materials used in Cherenkov detectors, substrate materials for large-scale integrated circuits with high-speed computing, catalyst carriers, gas filters, acoustic impedance coupling materials, and it is currently the best thermal insulation performance of solid material. [0003] SiO 2 The conventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/14
Inventor 贾德昌左军超段小明杨治华周玉
Owner HARBIN INST OF TECH
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