High-hydrophobicity cellulose acetate aerogel and preparation method thereof
A technology of cellulose acetate and high hydrophobicity, applied in the direction of coating, etc., can solve the problems of small water contact angle and high moisture absorption rate of saturated mass, and achieve mass reduction, specific surface area and pore volume reduction, and strong operability Effect
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[0033] see figure 1 , the invention provides a highly hydrophobic cellulose acetate airgel and a preparation method thereof, comprising the following steps:
[0034] 1) Preparation of cellulose acetate gel: use cellulose acetate as raw material and dissolve it in a solvent, add a crosslinking agent and a catalyst to obtain a cellulose acetate sol with a mass volume concentration of 10-110 g / L, stir and stand still to obtain cellulose acetate gel;
[0035] 2) After the cellulose acetate gel is aged, a mature cellulose acetate gel is obtained, the solvent in the mature cellulose acetate gel is replaced with an organic solvent for 1 to 5 days, and the cellulose acetate gas is obtained by supercritical drying. gel, and then carry out hydrophobic treatment to the cellulose acetate aerogel with a hydrophobic agent to obtain a highly hydrophobic cellulose acetate aerogel.
[0036] Preferably, the volume percentage concentration of the crosslinking agent in the solution is: 0.05-45%...
Embodiment 1
[0056] Dissolve 0.6 g of cellulose acetate in 60 mL of dimethylformamide solution, and stir at room temperature for 1 h until a clear solution is obtained. Subsequently, 3,5-dichloropyridine was added, stirring was continued for 10 min, and 0.8 mL of dicyclohexylmethane diisocyanate was added, and stirring was continued for 15 min to obtain cellulose acetate sol. The obtained cellulose acetate sol is transferred into a mold, sealed, and allowed to stand at room temperature and atmospheric pressure to obtain a cellulose acetate gel. Then, the cellulose acetate gel was aged in a constant temperature water bath at 25° C. for 1 day to obtain a mature cellulose acetate gel. The mature cellulose acetate gel is subjected to solvent replacement, and then supercritically dried at 35° C. and 8 MPa to obtain cellulose acetate airgel. Then heat-treat the cellulose acetate airgel in an oven at 60°C for 1 h, then place it in a closed container, add 0.06 g of methyltriethoxysilane, and perf...
Embodiment 2
[0059] Dissolve 0.83g of cellulose acetate in 68mL of methyl ethyl acetone, and stir at room temperature for 1h to a clear solution. Subsequently, 3,4,5-trichloropyridine was added, stirring was continued for 10 min, and 0.1 mL of hexamethylene diisocyanate was added, and stirring was continued for 15 min to obtain cellulose acetate sol. The obtained cellulose acetate sol is transferred into a mold, sealed, and allowed to stand at room temperature and atmospheric pressure to obtain a cellulose acetate gel. Then, the cellulose acetate gel was aged in a constant temperature water bath at 25° C. for 2 days to obtain a mature cellulose acetate gel. The mature cellulose acetate gel is subjected to solvent replacement, and then supercritically dried at 35° C. and 10 MPa to obtain cellulose acetate airgel. Then put the cellulose acetate airgel in a 65°C oven for heat treatment for 1.5h, then place it in a closed container, add 0.09g tetrafluoroethylene, and perform hydrophobic treat...
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