Method for preparing zirconium oxide aerogel through combination of secondary gelling method and ambient-pressure drying
An atmospheric drying and aerogel technology, applied in zirconia and other directions, can solve the problems of expensive equipment, high cost, and difficulty in large-scale production, and achieve the effect of improving the strength of the skeleton
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specific Embodiment approach 1
[0025] Specific embodiment one: In this embodiment, the method for preparing zirconia airgel by secondary gel method combined with normal pressure drying is carried out according to the following steps:
[0026] 1. Preparation of zirconia wet gel
[0027] Under stirring conditions, the ZrO(NO) 3 2H 2 Dissolve O in an alcoholic water solvent to make a transparent solution with a zirconyl nitrate concentration of 4.9-5.1wt%, then add formamide dropwise to the solution to obtain a mixed solution, and put the mixed solution in a water bath at a temperature of 60°C In a water bath, add ammonia water drop by drop to adjust the pH of the mixture to 8.7-9.3, then increase the stirring rate, stop stirring after 5-8 minutes, the gel is in a thick soup state, and continue to bathe at 60°C;
[0028] 2. ZrO 2 Regelation and Modification of Thick Gel
[0029] Transfer the thick soup-like gel prepared in step 1 to an oven at 43-47°C for aging until a wet gel solid is formed for the secon...
specific Embodiment approach 2
[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, a transparent solution with a zirconyl nitrate concentration of 5 wt % is prepared. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0033] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the alcohol-water solvent in Step 1 is made of absolute ethanol and water at a volume ratio of 2.8-3.2:1. Others are the same as in the first or second embodiment.
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