A kind of preparation method of silica airgel loaded with zinc sulfide
A technology of silica and airgel, which is applied in the field of composite airgel material preparation, can solve the problems that the performance of organic composite materials cannot meet the requirements of use, the preparation process is cumbersome, and the loading rate is low, so that it is not easy to oxidize and degrade, Effect of expanding application field and high load factor
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Embodiment 1
[0031] A preparation method of silica airgel loaded with zinc sulfide, the specific technological process is as follows figure 1 As shown, the following process steps are included:
[0032] Preparation of zinc sulfide sol: thiourea and zinc acetate are added to a mixed solution composed of 20wt% ammonia and isopropanol at a molar ratio of 1:1, and the volume ratio of 20wt% ammonia and isopropanol in the mixed solution is 1:1, the amount of thiourea added in each liter of mixed solution is 1mol, the above materials are mixed and stirred at 800-1200r / min for 2-3h, and then aged at 40°C for 30h to obtain nano-zinc sulfide sol;
[0033] Preparation of silica airgel: mix ethyl tetrasilicate, deionized water and absolute ethanol according to the volume ratio of 2:6:15, adjust the pH to 4 with hydrochloric acid, add 0.2wt% ammonia water dropwise to Immediately stop the dropwise addition after the gel is formed and let it stand still. After drying the formed gel in a drying oven at 5...
Embodiment 2
[0041]A preparation method of a silica airgel loaded with zinc sulfide, comprising the following process steps:
[0042] Preparation of zinc sulfide sol: thiourea and zinc acetate are added to a mixed solution composed of 22wt% ammonia and isopropanol at a molar ratio of 1:1.2, and the volume ratio of 22wt% ammonia and isopropanol in the mixed solution is 1:1.2, the amount of thiourea added per liter of the mixed solution is 1.2mol, the above materials are mixed and stirred at 1000r / min for 2.5h, and then aged at 30°C for 28h to obtain nano-zinc sulfide sol;
[0043] Preparation of silica airgel: mix ethyl tetrasilicate, deionized water and absolute ethanol according to the volume ratio of 1.5:5:12, adjust the pH to 3.5 with hydrochloric acid, add 0.2wt% ammonia water dropwise to Immediately stop the dripping after the gel is formed and let it stand still. After drying the formed gel in a drying oven at 50°C for 11 hours, pour off the excess solution in the gel, add absolute e...
Embodiment 3
[0049] A preparation method of a silica airgel loaded with zinc sulfide, comprising the following process steps:
[0050] Preparation of zinc sulfide sol: thiourea and zinc acetate are added to a mixed solution composed of 25wt% ammonia and isopropanol in a molar ratio of 1:1.1, and the volume ratio of 25wt% ammonia and isopropanol in the mixed solution is 1:0.8, the amount of thiourea added per liter of the mixed solution is 0.8mol, the above materials are mixed and stirred at 800r / min for 2h, and then aged at 20°C for 24h to obtain nano-zinc sulfide sol;
[0051] Preparation of silica airgel: Mix ethyl tetrasilicate, deionized water and absolute ethanol at a volume ratio of 1:4:10, adjust the pH to 3 with hydrochloric acid, add 0.25wt% ammonia water dropwise to Immediately stop the dropwise addition after the gel is formed and let it stand still. After drying the formed gel in a drying oven at 45°C for 10 hours, pour off the excess solution in the gel, add absolute ethanol t...
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