A kind of flexible hydrophobic airgel composite thermal insulation film and preparation method thereof
A technology of hydrophobic airgel and thermal insulation film, which is applied in separation methods, chemical instruments and methods, water/sewage treatment, etc. It can solve the problems of non-uniform compounding, affecting thermal insulation performance, and high preparation cost, and achieves a uniform network structure , low cost, simple preparation process
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[0019] The preparation method of the flexible hydrophobic airgel composite thermal insulation film of the present invention comprises the following steps: mixing trialkoxysilane containing alkyl groups with distilled water in a certain proportion, adding concentrated ammonia water to adjust the pH value of the solution to 8.5 ~11.5 Stirring to obtain a sol; the mass concentration of trialkoxysilane containing alkyl groups is 100~700g·L -1 ; immerse the hydroxyapatite film in the above sol for gelation, the gelation temperature is 20-90°C, and the gelation time is 0.1-20h; a composite wet gel is obtained; the obtained wet gel is subjected to normal Drying under pressure at a drying temperature of 60-120°C; a flexible hydrophobic airgel composite thermal insulation film is prepared.
[0020] Trialkoxysilanes containing alkyl groups are methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, propane At least one of trie...
Embodiment 1
[0024] Mix methyltrimethoxysilane with distilled water to obtain a mass concentration of 100g L -1 Methyltrimethoxysilane solution, then add ammonia water to adjust the pH value of the solution to be 8.5 and stir to obtain a sol;
[0025] The hydroxyapatite film with a thickness of 0.03mm is immersed in the above sol for gelation, the gelation temperature is controlled at 20°C, and the gelation time is 20h to obtain a composite wet gel; the wet gel is heated at 60°C Dry at normal pressure to obtain flexible hydrophobic airgel composite thermal insulation film.
[0026] The thickness of the above-mentioned flexible hydrophobic airgel composite thermal insulation film is 0.05mm, the polysiloxane airgel content in the thermal insulation film is 10wt%, and the thermal conductivity is 0.022W·m -1 k -1 , can be curled, can withstand high temperatures above 450°C in air atmosphere, and the contact angle is 154°.
Embodiment 2
[0028] Mix methyltriethoxysilane with distilled water to obtain a mass concentration of 200g L -1 Methyltriethoxysilane solution, then add ammonia water to adjust the pH value of the solution to 9.5 to obtain a sol;
[0029] Immerse the hydroxyapatite film with a thickness of 0.05mm in the above sol for gelation, control the gelation temperature to 50°C, and the gelation time to 15h to obtain a composite wet gel; wet gel at 80°C The flexible hydrophobic airgel composite thermal insulation film was obtained by drying under normal pressure.
[0030] The thickness of the above-mentioned flexible hydrophobic airgel composite heat insulation film is 0.07mm, the polysiloxane airgel content in the heat insulation film is 25wt%, and the thermal conductivity is 0.020W·m -1 k -1 , can be curled, can withstand high temperatures above 430°C in air atmosphere, and the contact angle is 164°.
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Abstract
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