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Method for preparing silicon dioxide silica aerogel composite material by drying in atmosphere pressure

A silicon dioxide and composite material technology, applied in the direction of silicon dioxide and silicon oxide, can solve problems such as poor control of uniformity and waste of raw materials, and achieve the effects of reducing production investment costs, low operating costs, and high safety factor

Inactive Publication Date: 2008-12-10
绍兴纳诺气凝胶新材料研发中心有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to completely fill the internal pores of the matrix material with airgel by the secondary compounding method, and the uniformity of the airgel in the matrix material or on the surface of the matrix material is not easy to control, and it is inevitable to generate dust and other environmental hazards during the compounding process. Factors, and easy to cause waste of raw materials, there are certain limitations for industrial production
However, the drying technology used in this technology is subcritical and supercritical drying, and there are also problems such as safety, cost, and fiber mat selection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Mix water glass, water, and hydrochloric acid in a volume ratio of 1:4:4, prepare a sol, and pour it into a mold with a quartz fiber board at a volume ratio of 1:2 between the sol and the quartz fiber board. After standing at ℃ for 10 hours, a composite gel was formed and aged for 12 hours. Keep the temperature constant, rinse the composite gel with water and ethanol successively, and perform solvent replacement on the gel. The volume ratio of composite gel: water: ethanol is 1:50:10, and the time is 120 hours and 72 hours respectively. Then use a mixture of bis(1,2-trimethoxysilyl)ethane and ethanol to modify the surface of the composite gel at a temperature of 50°C, gel: bis(1,2-trimethoxysilyl)ethane The volume ratio of alkane:ethanol is 1:1:1, and the time is 6 hours. Put the modified composite gel in an infrared drying oven at 240°C for 1 hour to dry. The prepared composite airgel material has good hydrophobicity. It is measured according to the national standard...

Embodiment 2

[0052] Using rice husk ash as a raw material, prepare a sol, (the preparation process can refer to the patent document CN1222473C), and then add 5% TiO of the sol mass 2 For powder, after fully stirring, put the high-alumina fiberboard into the sol and fully impregnate it. The volume ratio of sol to fiber is 1:0.01. After a period of time, take out the high-alumina fiberboard containing the sol, put it into a mold, and let it stand for a period of 5 hours at 50°C to form a composite gel, and age it for 24 hours. The composite gel was rinsed with water at 80°C, and then with ethanol at room temperature to perform solvent replacement on the gel. The volume ratio of composite gel: water: ethanol is 1:20:10, and the time is 72 hours and 48 hours respectively. Subsequently, the surface of the composite gel was hydrophobically modified with vinyltriethoxysilane, the volume ratio of gel:vinyltriethoxysilane was 1:5, and the time was 48 hours. The modified composite gel was dried at...

Embodiment 3

[0054] Diatomaceous earth and 1.0mol / L NaOH were mixed in a mass ratio of 1:10, boiled at 30°C for 270min, and the filtrate obtained after filtration was neutralized to pH 6.5 with 10.0mol / L acetic acid, and then The zirconium-containing fiberboard is fully impregnated in the sol, and the volume ratio of the sol to the fiber is 1:0.5. After 20 hours, the zirconium-containing fiberboard containing the sol is taken out, put into a mold, and a composite gel is formed after standing for a period of time at room temperature , and aged for 5 hours. Soak the composite gel with ethanol and n-hexane in turn to perform solvent replacement on the gel. The volume ratio of composite gel:ethanol:n-hexane is 1:10:5, and the time is 72 hours and 72 hours respectively. Subsequently, the surface of the composite gel was hydrophobically modified with vinyltrichlorosilane, the volume ratio of gel:vinyltrichlorosilane was 1:10, and the time was 24 hours. The modified composite gel was microwave-...

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Abstract

The invention discloses a method for preparing a silicon dioxide aerogel composite material at the condition of normal pressure and drying, which comprises the steps as following: (1) silicon dioxide sol and a reinforcing material are compounded and placed statically to form plural gel, and then ageing treatment is carried out to the plural gel; (2) a modifying agent is used for the hydrophobic modification of the aged plural gel, and then ambient pressure drying is carried out for the modified plural gel to obtain the silicon dioxide aerogel composite material at the condition of normal pressure and drying. The silicon dioxide aerogel composite material prepared by the method of the invention has extremely low coefficient of heat conductivity, which greatly increases the added value of the reinforcing materials such as corpus fibrosum, the product can be widely applied to thermal insulation and sound insulation of buildings, thermal insulation and sound insulation in the industrial pipeline transportation, and the like, and expands the application field of silicon dioxide and the corpus fibrosum.

Description

technical field [0001] The invention relates to the field of preparation of chemical materials, in particular to a method for preparing silica airgel composite materials by using an in-situ composite method and normal pressure drying technology, Background technique [0002] Airgel is a new type of low-density, high-porosity nanoporous material with controllable structure. It has a continuous network structure. The range of pore size and particle diameter is on the order of nanometers. The unit size is 1-20nm, the porosity is as high as 80.0%-99.8%, and the specific surface area is as high as 800-1000m 2 / g. The unique properties of airgel in terms of mechanics, acoustics, thermals, optics, etc., such as extremely low solid and gaseous thermal conductivity, low refractive index, low elastic modulus, low acoustic impedance, strong adsorption performance, etc., make It has a very broad prospect in aerospace, chemical industry, energy-saving building, military, communication,...

Claims

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Application Information

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IPC IPC(8): C01B33/14
Inventor 金承黎张洪彪张蓉艳余盛锦
Owner 绍兴纳诺气凝胶新材料研发中心有限公司
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