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Silicon aerogel material preparation method

A silicon aerogel, wet gel technology, applied in the directions of silicon oxide, silicon dioxide, etc., can solve the problems of low mechanical strength and difficult to be widely used, and achieve the effect of enhancing mechanical strength

Inactive Publication Date: 2015-08-19
BEIJING BOTIANZIRUI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although silica airgel has the above excellent properties, it is difficult to be widely used due to the low mechanical strength of silica airgel materials prepared by the prior art

Method used

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  • Silicon aerogel material preparation method

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preparation example Construction

[0029] The invention provides a method for preparing a silicon airgel material, comprising:

[0030] a), silicate ester, water, auxiliary agent and organic solvent are mixed, carry out hydrolysis reaction under acidic condition, obtain sol;

[0031] The auxiliary agent is one or more of cetyltrimethylammonium bromide, sodium dodecylbenzenesulfonate, sodium dioctylsuccinatesulfonate and sodium glycocholate;

[0032] b), the sol is subjected to polycondensation reaction under alkaline conditions to obtain a wet gel material;

[0033] c) The wet gel material is dried to obtain a silica airgel material.

[0034] In the present invention, the silicate ester, water, auxiliary agent and organic solvent are firstly mixed, and the hydrolysis reaction is carried out under acidic conditions to obtain the sol. Wherein, the silicate is preferably ethyl orthosilicate, more preferably one or more of ethyl orthosilicate-28, ethyl orthosilicate-32 and ethyl orthosilicate-40. The auxiliary a...

Embodiment 1

[0045] Weigh 100g tetraethyl orthosilicate-32 and 800g water into the container, start stirring, and add a certain amount of 1mol / L hydrochloric acid at the same time to adjust the pH value of the system to 4, then slowly add 1000mL of 95wt% alcohol, the alcohol addition process , the vessel temperature was maintained at 30 °C. After the alcohol was added, 100 g of cetyltrimethylammonium bromide was added, and reacted at 40° C. for 2 hours to obtain a silica sol.

[0046] Concentrated ammonia water was slowly added to the above silica sol to adjust the pH of the system to 13, and reacted at 50°C for 24 hours to obtain a wet gel material.

[0047] The wet gel material prepared above was soaked in ethanol and soaked at 50° C. for 24 hours. After soaking, separate the wet gel material and ethanol, put the separated wet gel material into a mixed solution of 100mL hexamethyldisilazane and 1000mL ethanol, and heat at 65°C for 24h.

[0048] After heating, take out the wet gel mater...

Embodiment 2

[0052] Weigh 120g of tetraethyl orthosilicate-40 and 900g of water into the container, start stirring, and add a certain amount of 1mol / L hydrochloric acid to adjust the pH value of the system to 3, then slowly add 1200mL of 95wt% alcohol, the alcohol addition process , the vessel temperature was maintained at 32 °C. After the alcohol was added, 120 g of sodium dodecylbenzenesulfonate was added and reacted at 42° C. for 3 h to obtain a silica sol.

[0053] Slowly add concentrated ammoniacal liquor to the above-mentioned silica sol, adjust the pH value of the system to be 12, add glass fiber needle felt (gram weight: 950g / m 2 , Tensile breaking strength: 1900N / 50mm, Bursting strength: 3.6MPa, Air permeability: 10m 3 / m 2 .min, temperature resistance: 600°C, thickness: 3mm, density: 110kg / m 3 ), so that the needle felt is completely wetted by the solution. After absorbing the mixed solution of silica sol and ammonia water, the needle felt was reacted at 50°C for 16 hours to ...

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Abstract

The invention belongs to the field of chemical industry materials, and more particularly relates to a silicon aerogel material preparation method. The preparation method comprises: a) mixing silicate, water, an auxiliary agent and an organic solvent, and carrying out a hydrolysis reaction under an acid condition to obtain a sol, wherein the auxiliary agent is one or a plurality of materials selected from hexadecyl trimethyl ammonium bromide, sodium dodecyl benzene sulfonate, dioctyl sodium sulfosuccinate and sodium glycocholate; b) carrying out a condensation polymerization reaction on the sol under an alkaline condition to obtain a wet gel material; and c) carrying out a drying treatment on the obtained wet gel material to obtain the silicon aerogel material. According to the preparation method of the present invention, the auxiliary agent is added during the silicon aerogel material preparation process, wherein the mechanical strength of the silicon aerogel material can be increased through the addition of the auxiliary agent.

Description

technical field [0001] The invention belongs to the field of chemical materials, and in particular relates to a method for preparing a silicon airgel material. Background technique [0002] Airgel generally refers to a lightweight nano-solid material that aggregates nanometer-scale ultrafine particles to form a nanoporous network structure, and fills the network pores with a gaseous dispersion medium. Among them, the most common airgel is silica airgel. [0003] Silica airgel, also known as SiO 2 Airgel is a kind of nano-SiO 2 A solid amorphous material composed of aggregated particles. The porosity of silica airgel is as high as 80-90%, and the density is as low as 3kg / m 3 , the specific surface area is as high as 1200m 2 / g, is a typical nanoporous material. [0004] Silica airgel has a variety of excellent properties: 1) Excellent heat insulation, silicon airgel material has an extremely low thermal conductivity, which can reach 0.013-0.016W / (m.K), which is 2 times ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 赵峰唐智勇徐天宇
Owner BEIJING BOTIANZIRUI TECH CO LTD
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