Hydrophobic silica aerogel heat-insulation composite material and preparation method thereof

A technology of silica and composite materials, which is applied in the field of hydrophobic silica airgel thermal insulation composite materials and its preparation, can solve the problem of limiting the application range and market of airgel products, the impact on human health and production safety, and air condensation There are problems in the use of glue products, so as to achieve the effect of improving high temperature heat insulation performance, excellent hydrophobic 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

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Effect test

preparation example Construction

[0034] The preparation method of the hydrophobic silica airgel thermal insulation composite material of the present invention comprises the following steps:

[0035] (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.

[0036] 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 discloses a hydrophobic silica aerogel heat-insulation composite material and a preparation method thereof. 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. During preparation of sol, siloxane containing hydrophobic groups is introduced, and the content and the distribution state of the hydrophobic groups in a system are controlled by controlling the reactant content and reaction conditions, so that the composite material can pass the test of GB8624-2012 Classification for Burning Behavior of Building Materials and Products (A1-level). The preparation method of the composite material comprises steps as follows: (1) preparation of the silica sol; (2) preparation of composite gel; (3) solvent replacement; (4) drying. With the adoption of the method, the process is simple, the production cycle is short, the cost is lower, the equipment requirement is low, 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.

Description

technical field [0001] The invention relates to an airgel thermal insulation material and a preparation method thereof, in particular to a hydrophobic silica airgel thermal insulation composite material and a preparation method thereof. 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)...

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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