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Preparation method of aerogel composite material

A composite material and aerogel technology, applied in the field of aerogel, can solve the problems of easy breaking, long preparation period, poor flexibility, etc., and achieve the effects of good flexibility, excellent thermal insulation effect, and simplified process flow

Inactive Publication Date: 2014-01-08
BEIJING AIRUOGE SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the fiber-reinforced airgel thermal insulation composite material prepared in the prior art has poor flexibility, is easy to break, and has a long preparation period, so the present invention provides a short preparation period and has Preparation method of highly flexible airgel composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of airgel composite material described in the present embodiment, its steps are as follows:

[0028] (1) Using ethyl orthosilicate as the silicon source and ethanol as the solvent, take 440 mL of ethyl orthosilicate, 720 mL of ethanol, and 108 mL of distilled water, and control the molar ratio of ethyl orthosilicate: ethanol: distilled water to be 1:6: 3. Add them to the container one by one, stir them electrically for 10 minutes to mix them evenly, add 150 mL of 0.03 mol / L dilute ammonia water to the mixed solution to adjust the pH value to 7, and continue stirring for 10 minutes to obtain a silica sol;

[0029](2) Immerse the glass fiber mat into the silica sol prepared in step (1), then put it into an autoclave, vacuumize to -0.03MPa, fill it with nitrogen to 4MPa, and heat up at a rate of 5°C / min Raise the temperature to 350°C and control the pressure to 10MPa. After maintaining the supercritical state for 30min, release the pressure at a rate...

Embodiment 2

[0031] The preparation method of airgel composite material described in the present embodiment, its steps are as follows:

[0032] (1) Use a mixture of ethyl orthosilicate, methyl orthosilicate, and trimethylchlorosilane in a molar ratio of 1:1:1 as the silicon source, and ethanol as the solvent. Take 440 mL of the silicon source mixture, 960 mL of ethanol, and distilled water 108mL, and control the silicon source mixture: ethanol: distilled water with a molar ratio of 1:8:3, add it to the container in turn, stir it for 10 minutes to make it evenly mixed, and add 160mL of 0.08mol / L dilute ammonia water to the mixed solution Adjust the pH value to 8, and continue to stir for 10 minutes to obtain a silica sol;

[0033] (2) Immerse the glass fiber mat into the silica sol prepared in step (1), then put it into an autoclave, vacuumize to -0.03MPa, fill it with nitrogen to 10MPa, and heat up at a rate of 15°C / min Raise the temperature to 400°C, and control the pressure to 20MPa. Af...

Embodiment 3

[0035] The preparation method of airgel composite material described in the present embodiment, its steps are as follows:

[0036] (1) Using ethyl orthosilicate as the silicon source and ethanol as the solvent, take 440 mL of ethyl orthosilicate, 1440 mL of ethanol, and 108 mL of distilled water, and control the molar ratio of ethyl orthosilicate: ethanol: distilled water to be 1:12: 3. Add to the container one by one, stir for 10 minutes to make it evenly mixed, add 170mL of 0.3mol / L dilute ammonia water to the mixed solution to adjust the pH value to 9, and continue to stir for 10 minutes to obtain a silica sol;

[0037] (2) Immerse the carbon fiber felt into the silica sol prepared in step (1), then put it into the autoclave, vacuumize to -0.03MPa, flush nitrogen to 8MPa, and raise the temperature at a heating rate of 10°C / min to 380 ℃, and control the pressure to 15MPa, after maintaining the supercritical state for 30min, release the pressure at a rate of 0.4MPa / min, and f...

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Abstract

The invention relates to a preparation method of an aerogel composite material. The preparation method comprises the following steps: firstly, uniformly mixing a silicon source, a solvent and distilled water in a proportion of (1:4:2)-(1:12:4) and adjusting the pH value to 7-10, and stirring to obtain silicon dioxide sol; and then, dipping fibers in the unaged silicon dioxide sol, and carrying out supercritical drying treatment to obtain the aerogel composite material. According to the method provided by the invention, after the fibers are dipped into the silicon dioxide sol, supercritical drying treatment is directly carried out without gelatinizing and aging the sol at room temperature, so that the prepared aerogel composite material has good flexibility and excellent heat insulating effect. Meanwhile, the method provided by the invention is simple in process flow, the preparation time of the aerogel composite material can be greatly shortened, and the preparation period can be controlled within 4 hours.

Description

technical field [0001] The invention relates to a preparation method of an airgel composite material, belonging to the technical field of airgel. Background technique [0002] Airgel is a porous solid material that replaces the solvent in the gel with air through a certain method while maintaining the integrity of the porous structure of the gel. Aerogels have many unique properties, including extremely low density, high porosity, high specific surface area, low thermal conductivity, etc. [0003] Among them, silica airgel has unique properties in thermal, optical, electrical, acoustic and other aspects due to its unique nanoporous structure. In terms of heat, silica airgel has a special porous network structure, and the porosity can generally reach more than 90%, so its density is low. Since the solid phase in the silica airgel accounts for a small proportion of the entire airgel volume, coupled with the unique curved pore structure of the porous network structure, the so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 潘永振
Owner BEIJING AIRUOGE SCI & TECH DEV
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