Preparation method of zirconium oxide-silicon oxide composite aerogel
A composite airgel and silicon oxide technology, which is applied in zirconia, chemical instruments and methods, silicon compounds, etc., can solve problems such as less research, and achieve good high temperature stability and low thermal conductivity.
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[0032] Example 1
[0033] A method for preparing zirconium oxide-silica composite aerogel. The zirconium alkoxide is zirconium propoxide, the siloxane is ethyl orthosilicate, the alcohol solvent is ethanol, and the aging solution is anhydrous ethanol: orthosilica. Ethyl acid = 1:0.25 mixed solution, drying medium is absolute ethanol, siloxane: zirconium alkoxide molar ratio = 1:0.11, the concentration of zirconium alkoxide and siloxane in the zirconium oxide-silica composite sol The sum is 0.25mol / L. Follow these steps in sequence:
[0034] (1) Preparation of pre-hydrolyzed siloxane solution
[0035] At 4℃, dissolve ethyl orthosilicate in ethanol, stir and mix to obtain a 0.225mol / L mixed solution; according to mol Si: mol HNO 3 =1: 0.06 drops of concentrated nitric acid with a mass concentration of 65 to 68%. According to mol Si: mol H 2 O=1:3, add deionized water dropwise, continue to stir for 60 minutes to obtain the pre-hydrolyzed siloxane solution;
[0036] (2) Preparation of ...
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[0045] Example 2
[0046] A preparation method of zirconium oxide-silica composite aerogel, zirconium alkoxide is n-propoxide zirconium, siloxane is tetramethoxysilane, alcohol solvent is n-propanol, and aging solution is absolute ethanol by volume: Ethyl orthosilicate = 1:1 mixed solution, drying medium is absolute ethanol, siloxane: zirconium alkoxide molar ratio = 1: 1, zirconium alkoxide and siloxane in the zirconium oxide-silica composite sol The sum of the concentrations is 0.5mol / L. Follow these steps in sequence:
[0047] (1) Preparation of pre-hydrolyzed siloxane solution
[0048] Dissolve tetramethoxysilane in n-propanol at 20°C, stir and mix to obtain a 0.25mol / L mixed solution; according to mol Si: mol HNO 3 =1: 0.09 drops of concentrated nitric acid with a mass concentration of 65 to 68%. According to mol Si: mol H 2 O=1:2.5 add distilled water dropwise, continue to stir for 30min to obtain the pre-hydrolyzed siloxane solution;
[0049] (2) Preparation of zirconia-sili...
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[0058] Example 3
[0059] A method for preparing zirconium oxide-silica composite aerogels, zirconium isopropoxide is used for zirconium alkoxide, methyltriethoxysilane is used for siloxane, isopropanol is used for alcohol solvent, and aging solution is anhydrous by volume. Ethanol: ethyl orthosilicate = 1:2 mixture, drying medium is isopropanol, siloxane: zirconium alkoxide molar ratio = 1: 1, zirconium alkoxide and silicon in the zirconium oxide-silica composite sol The sum of the concentration of oxane is 1.0 mol / L. Follow these steps in sequence:
[0060] (1) Preparation of pre-hydrolyzed siloxane solution
[0061] At 20℃, dissolve methyl triethoxy silicon in isopropanol, stir and mix to obtain a 0.5mol / L mixed solution; according to molSi:mol HNO 3 =1: 0.09 drops of concentrated nitric acid with a mass concentration of 65 to 68%. According to mol Si: mol H 2 O=1:2.5 add distilled water dropwise, continue to stir for 30min to obtain the pre-hydrolyzed siloxane solution;
[0062...
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