Preparation method of hydrophobic silica aerogel heat-insulation composite material

A technology of silicon dioxide and composite materials, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the limitation of the application scope and market of aerogel products, the impact on human health and production safety, and the use of aerogel products. There are other problems, to achieve the effect of improving high temperature heat insulation performance, excellent hydrophobic performance and convenient operation

Active 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 t...

Method used

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Examples

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preparation example Construction

[0033] The preparation method of the hydrophobic silica airgel thermal insulation composite material of the present invention comprises the following steps:

[0034] (1) Preparation of silica sol: use siloxane as the precursor, mix and stir various siloxanes evenly, then add organic solvent and water, stir evenly, keep stirring, then add acidic catalyst drop by drop to adjust the pH of the solution value to 1-6, preferably 1-5, at 0°C-70°C constant temperature for more than 6 hours, preferably at 30-70°C constant temperature for more than 8 hours, to obtain a clear silica sol; the siloxane, organic solvent , The molar ratio of water is 1:1-80:2-40, preferably 1:1-70:2-30. By optimizing the molar ratio of siloxane, organic solvent, and water, the porosity, specific surface area, density, and organic matter content of the airgel can be adjusted to obtain a silica airgel with better performance.

[0035] Siloxane is Si(OR 1 ) 4 with R 2 Si (OR 3 ) 3 , R 4 2 Si (OR 5 ) 2...

Embodiment 1

[0049] Mix and stir methyl orthosilicate and vinyltrimethoxysilane at a molar ratio of 1:8, then fully mix and stir this mixture with propanol and water at a molar ratio of 1:40:3, and use 3mol / L of H 2 SO 4Slowly drop the solution into the uniformly mixed solution, and change the dropwise addition while stirring, adjust the pH value of the solution to 1, and then keep stirring the prepared solution at 50°C for 10 hours to prepare a silica sol. According to the proportion of doping 5g zinc borate, 5g ammonium polyphosphate, and 5g nickel oxide per 1L of silica sol, dope the flame retardant and infrared blocking agent into the sol, mix thoroughly and evenly, and then adjust the pH value with ammonia solution to 6. The ceramic fiber felt was immersed in the doped silica sol, placed in a water bath at 40°C, and a silica composite gel was formed after 30 hours. Continue aging for 20 hours in a 60°C water bath. Take out the composite gel and replace it with propanol. The rat...

Embodiment 2

[0051] Mix and stir ethyl orthosilicate and diethyldiethoxysilane at a molar ratio of 1:6, then fully mix and stir the mixture, absolute ethanol and water at a molar ratio of 1:50:8 Uniformly, use 2mol / L HOOC-COOH solution to slowly drop into the uniformly mixed solution, add dropwise while stirring, adjust the pH value of the solution to 5, and then keep stirring the prepared solution at 50°C for 12 hours to obtain the Silica sol. According to the ratio of doping 3g of antimony oxide, 6g of melamine phosphate, and 3g of indium tin oxide per 1L of silica sol, dope the flame retardant and infrared blocking agent into the sol, mix thoroughly and evenly, and then adjust the pH value with ammonia solution to 6.3. The basalt fiber felt was immersed in the doped silica sol, placed in a water bath at 60°C, and a silica composite gel was formed after 8 hours. Continue aging for 24 hours in a 50°C water bath. The composite gel was taken out and replaced with absolute ethanol, th...

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PUM

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Abstract

The invention relates to a preparation method of a hydrophobic silica aerogel heat-insulation composite material. The method comprises steps as follows: (1) preparation of silica sol: siloxane is used as a precursor, an organic solvent, water and an acid catalyst are added, and the silica sol is obtained; (2) preparation of composite gel: a flame retardant and an infrared blocking agent are added to the silica sol, the mixture is evenly mixed, a base catalyst is added, an inorganic fiber product is immersed in the silica sol, and the mixture is left to stand; (3) solvent replacement: the composite gel is replaced by the organic solvent; (4) drying: the composite gel is dried. With the adoption of the method, the process is simple, the production cycle is short, the cost is lower, the equipment requirement is low, reaction conditions are controllable, product performance is excellent, and the prepared silica aerogel 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.

Description

technical field [0001] The invention relates to a preparation method of an airgel thermal insulation material, in particular to a preparation method of 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 c...

Claims

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Application Information

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IPC IPC(8): C04B32/00C01B33/145C01B33/146
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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