A kind of preparation method of hydrophobic and lipophilic sponge airgel composite material
A composite material, hydrophobic and lipophilic technology, applied in the field of porous materials, can solve the problems of long preparation period, gel structure damage, low compressive strength, etc., and achieve the advantages of easy portability and transportation, less organic solvent, and enhanced mechanical strength Effect
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Embodiment 1
[0030] The specific operation steps for preparing hydrophobic and lipophilic sponge airgel composites are as follows:
[0031] 1. Mix 10ml of methyltrimethoxysilane with 20ml of ethanol, and add 50ml of deionized water (the molar ratio of the three is 1:2.45:15.84) for stirring to form a silicon source solution.
[0032] 2. Add 0.1mol / L hydrochloric acid to the silicon source solution to adjust the pH value of the solution to about 3.6, then add 0.1g F127, stir at room temperature for 20 minutes, add concentrated ammonia water with a concentration of 10mol / L and stir to obtain a pH value of about 8 silica sol.
[0033] 3. Pour the silica sol into a container containing a polyurethane sponge block (3cm×3cm×3cm), and let it stand for 2 hours to form a wet gel.
[0034] 4. Put the wet gel in a drying oven at 100°C and dry it under normal pressure for 6 hours to obtain a hydrophobic and adsorbable sponge-silica airgel composite material with a density of 0.114g / cm3, a porosity of...
Embodiment 2
[0036] The specific operation steps for preparing hydrophobic and lipophilic sponge airgel composites are as follows:
[0037] 1. Mix 10ml of methyltriethoxysilane with 12.7ml of methanol and add 18.1ml of deionized water (the molar ratio of the three is 1:4.9:15.84) for stirring to form a silicon source solution;
[0038] 2. Add ammonium fluoride with a concentration of 0.5mol / L to the silicon source solution to adjust the pH value of the solution to about 3.8; after stirring at room temperature for 20 minutes, add concentrated ammonia water with a concentration of 5mol / L and stir to obtain silicon with a pH value of about 8. Sol;
[0039] 3. Pour the silica sol into a container containing a polyurethane sponge block (3cm×3cm×3cm), and let it stand for 2 hours to form a wet gel;
[0040]4. Put the wet gel in a drying oven at 80°C and dry it under normal pressure for 8 hours to obtain a hydrophobic and adsorbable sponge-silicon airgel composite material with a density of 0.10...
Embodiment 3
[0042] The specific operation steps for preparing hydrophobic and lipophilic sponge airgel composites are as follows:
[0043] 1. Mix 10ml of ethyltriethoxysilane with 17.4ml of isopropanol and add 13.2ml of deionized water (the molar ratio of the three is 1:4.9:15.84) for stirring to form a silicon source solution;
[0044] 2. Add hydrochloric acid with a concentration of 0.1mol / L to the silicon source solution to adjust the pH value of the solution to about 4; 8 silica sol;
[0045] 3. Pour the silica sol into a container containing a polyurethane sponge block (3cm×3cm×3cm), and let it stand for 6 hours to form a wet gel;
[0046] 4. Put the wet gel in a drying oven at 100°C and dry it under normal pressure for 6 hours to obtain a hydrophobic and adsorbable sponge-silicon airgel composite material with a density of 0.121g / cm3, a porosity of 93%, and a pore size of 3-10μm, the absorption of various organic liquids is 0.7-0.9ml / cm 3 .
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