High-temperature-treated high-drawing-resistance aerogel composite material and preparation method thereof
A composite material and high-temperature treatment technology, applied in the field of aerogel, can solve the problems of low tensile strength and can not meet the technical specification requirements in the field of building insulation, and achieve the effect of improving the tensile strength
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[0021] An embodiment of the present invention provides a high-temperature-treated high-drawing-resistant airgel composite material and a preparation method thereof, comprising the following steps:
[0022] Step 1: using the fiber composition as the core material, treating the core material at a high temperature of 700-1000° C. and a pressure of 0.001-10 MPa for 1-600 minutes to obtain a high-stretch core material with three-dimensional interweaving and curing with a smooth surface;
[0023] Step 2: Using the three-dimensional braided fiber obtained in step one as a reinforcing base material, soaking the three-dimensional braided fiber in aerosol, gelling, aging, modifying, and drying to obtain a high-drawing-resistant airgel composite material;
[0024] Or the fiber composition is used as a reinforced base material to obtain an airgel composite material through gelation, aging, modification, and drying, and then the airgel composite material is treated at a high temperature of ...
Embodiment 1
[0032] Take a glass fiber needle felt with a thickness of 10mm, and treat it at 750°C and a pressure of 0.05MPa for 30 minutes to form a three-dimensional interwoven and cured high-stretch core material with a smooth surface. Weigh 80 g of sodium water glass with a modulus of 3.3, add 60 g of pure water and stir evenly to obtain diluted water glass. Take by weighing 20 g of sulfuric acid with a concentration of 40% wt, and then add diluted water glass to the sulfuric acid while stirring until the pH value is 3. Continue adding 300 g of 95% wt ethanol while stirring. The precipitate in the sol was removed with a centrifugal filter to obtain a transparent and clear silica sol. Add ammonia water with a concentration of 1% wt to the silica sol to adjust the pH to 4.1, and then soak the silica sol in the aforementioned high-stretch-resistant core material. After about 50 minutes, it gels, and it is aged at room temperature for 5 hours. Put the aged gel into a mixture of 40%wt sul...
Embodiment 2
[0034] Spread a layer of basalt fiber loose cotton with a thickness of 50mm, and treat it at 900°C for 60 minutes under a pressure of 0.01MPa to form a three-dimensional interwoven and cured high-strength core material with a smooth surface. Weigh 200 g of silica sol with a pH value of 3 and a concentration of 25%, 100 g of an aluminum sol with a pH value of 2.5 and a concentration of 20%, and add 600 g of water for dilution to obtain a mixed silica-alumina sol. Add ammonia water with a concentration of 2%wt to the silica-alumina sol dropwise, adjust the pH to 4.5, pour it into a box covered with a high-stretch-resistant core material for 25 minutes, then gel, and let it stand for aging for 15 hours. Pour 500ml of trimethylchlorosilane onto the aged gel for hydrophobic modification. After 6 hours, the modification was completed, and the gel was dried under normal pressure at 120°C for 2 hours to obtain a high-stretching-resistant airgel composite material with a thermal conduc...
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