Hydrophobic silica aerogel heat-insulation composite material

A technology of silica and composite materials, which is applied in the field of airgel thermal insulation materials, can solve the problems of limiting the application range and market of airgel products, the impact on human health and production safety, and the use of airgel products, so as to reduce the The number of times of solvent replacement, the effect of improving high-temperature heat insulation performance and convenient operation

Inactive Publication Date: 2015-04-29
纳诺科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the silica airgel and its composite materials prepared by the traditional process are placed in an environment above 500°C, high-temperature heat release and fire will inevitably occur, and it is difficult to pass the GB8624-2012 building materials and The detection of its product combustion performance classification (A1 level) (the detection requires no combustion at a high temp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] The preparation method of the hydrophobic silica aerogel thermal insulation composite material of the present invention includes the following steps:

[0031] (1) Preparation of silica sol: Using siloxane as the precursor, mix and stir a variety of siloxanes, then add organic solvent and water, stir evenly, maintain stirring, and then add acidic catalyst dropwise to adjust the pH of the solution The value is 1 to 6, preferably 1 to 5, at 0°C to 70°C for more than 6 hours, preferably 30 to 70°C for more than 8 hours to obtain a clear silica sol; the siloxane, organic solvent , The molar ratio of water is 1:1 to 80:2 to 40, preferably 1:1 to 70:2 to 30. By optimizing the molar ratio of siloxane, organic solvent, and water, the porosity, specific surface area, density, and organic content of the aerogel can be adjusted to obtain a silica aerogel with better performance.

[0032] The organic solvent is one or more of methanol, ethanol, ethylene glycol, propanol, n-butanol, isob...

Example Embodiment

[0040] Example 1

[0041] Mix methyl orthosilicate and vinyl trimethoxy silane at a molar ratio of 1:8 and stir evenly, and then mix and stir the mixture with propanol and water at a molar ratio of 1:40:3. 3mol / L of H 2 SO 4 The solution was slowly dropped into the uniformly mixed solution, and the solution was changed to dropwise while stirring. The pH value of the solution was adjusted to 1, and then the prepared solution was continuously stirred at 50° C. for 10 hours to prepare a silica sol. Doping 5g zinc borate, 5g ammonium polyphosphate, 5g nickel oxide per 1L silica sol doped flame retardant and infrared blocking agent into the sol, mix well and stir evenly, then adjust the pH value with ammonia solution To 6. The ceramic fiber mat is immersed in the doped silica sol, placed in a water bath at 40°C, and a silica composite gel is formed after 30 hours. Continue to age in a 60°C water bath for 20 hours. Take out the composite gel and replace it with propanol. The rati...

Example Embodiment

[0042] Example 2

[0043] Mix and stir the ethyl orthosilicate and diethyldiethoxysilane at a molar ratio of 1:6, and then mix and stir the mixture, absolute ethanol, and water at a molar ratio of 1:50:8. Evenly, use 2mol / L HOOC-COOH solution to slowly drop into the mixed solution, while stirring, change to dripping, adjust the pH value of the solution to 5, and then continue to stir the prepared solution at 50℃ for 12 hours to prepare Silica sol. According to the ratio of 10g antimony oxide, 10g melamine phosphate, and 10g indium tin oxide per 1L silica sol, the flame retardant and infrared blocking agent are doped into the sol, mixed and stirred well, and then adjusted the pH value with ammonia solution To 6.3. The basalt fiber felt is immersed in the doped silica sol and placed in a water bath at 60° C. After 8 hours, a silica composite gel is formed. Continue to age in a water bath at 50°C for 24 hours. Take out the composite gel and replace it with anhydrous ethanol...

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PUM

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Abstract

The invention relates to a hydrophobic silica aerogel heat-insulation composite material. The composite material consists of silica aerogel and an inorganic fiber product, wherein the silica aerogel is doped with a flame retardant and an infrared blocking agent; the inorganic fiber product comprises one or more of glass fibers, quartz glass fibers, aluminium silicate fibers, ceramic fibers, alumina fibers, zirconia fibers, rock wool fibers and basalt fibers, and the porosity of the inorganic fiber product is higher than 50%. The composite material has the overall waterproof performance, the extremely low heat conductivity coefficient and the excellent high-temperature heat-insulation performance, can pass an incombustibility test under the condition that the material is ensured to be hydrophobic as a whole, and reaches level A1 according to the incombustibility test; the preparation process is simple, the production cycle is short, the cost is lower, the equipment requirement is low, and reaction conditions are controllable.

Description

technical field [0001] The invention relates to an airgel thermal insulation material, in particular to a hydrophobic silica airgel thermal insulation composite material. Background technique [0002] Silica airgel is a low-density, high-porosity nanoporous amorphous solid material with high light transmittance. It is also called "blue smoke" and "solid smoke". The pores are filled with gaseous dispersion media. , with a continuous nano-scale three-dimensional network structure and holes, is the solid material with the lowest density and the lowest thermal conductivity known in the world. Its pore size and network skeleton are both nanoscale, the size distribution range of pores is 1-100 nanometers, and the particle size distribution range of network skeleton is 1-30 nanometers. This special structure makes it have high porosity (80%-99.8%) , low density (3~250kg / m3), high specific surface area (500~1000m2 / g), low dielectric constant (1.1~2.5), low thermal conductivity (0.0...

Claims

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Application Information

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IPC IPC(8): C04B30/02
Inventor 余盛锦张蓉艳孙倩倩欧阳红武刘兵
Owner 纳诺科技有限公司
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