Method for preparing nano silica subjected to surface modification by urushiol
A nano-silica, surface modification technology, applied in the field of nanomaterials, can solve problems such as high price, interface interaction, compatibility problems, etc.
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Embodiment 1
[0019] Add 10.41 grams of tetraethyl orthosilicate, 1.32 grams of distilled water and 10.00 grams of absolute ethanol in a three-necked flask, pre-mix to form a mixture, raise the temperature to 60°C, and add dropwise at a stirring speed of 400 rpm 0.05 g of 37% hydrochloric acid aqueous solution was reacted at constant temperature for 8 hours.
[0020] Cool the mixed solution to 40°C, and at a stirring rate of 600 rpm, add 31.40 g of 5% urushiol in absolute ethanol solution dropwise, after the drop is complete, react at a constant temperature for 3 hours to obtain nano-silica dispersions modified by urushiol surface. liquid.
[0021] The resulting dispersion was centrifuged at 8000 rpm, the precipitate was washed three times with absolute ethanol, and dried in a vacuum oven at 80°C for 6 hours to obtain urushiol-modified nano-silica.
Embodiment 2
[0023] Add 10.41 grams of tetraethyl orthosilicate, 1.32 grams of distilled water and 9.50 grams of absolute ethanol in a three-necked flask, mix them in advance to form a mixed solution, raise the temperature to 60°C, and add it dropwise at a stirring speed of 400 rpm 0.05 g of 37% hydrochloric acid aqueous solution was reacted at constant temperature for 8 hours.
[0024] Cool the mixed solution to 40°C, and add 15.70 g of 10% urushiol in absolute ethanol solution dropwise at a stirring rate of 600 rpm. After the drop is complete, react at a constant temperature for 3 hours to obtain nano-silica dispersions modified by urushiol surface. liquid.
[0025] The resulting dispersion was centrifuged at a speed of 6000 rpm, and the precipitate was washed three times with absolute ethanol, and then dried in a vacuum oven at 80°C for 6 hours to obtain urushiol-modified nano-silica.
Embodiment 3
[0027] Add 10.41 grams of tetraethyl orthosilicate, 1.32 grams of distilled water and 11.50 grams of absolute ethanol into a three-necked flask, mix them in advance to form a mixed solution, raise the temperature to 60°C, and add it dropwise at a stirring speed of 400 rpm 0.05 g of 37% hydrochloric acid aqueous solution was reacted at constant temperature for 8 hours.
[0028] The mixed solution was heated up to 80°C, and at a stirring rate of 1400 rpm, 10.47 grams of 15% urushiol in absolute ethanol was added dropwise, and after the dropping was completed, the mixture was reacted at a constant temperature for 30 minutes to obtain nano-silica dispersions modified by urushiol surface. liquid.
[0029] The resulting dispersion was centrifuged at a speed of 12,000 rpm, and the precipitate was washed three times with absolute ethanol, and then dried in a vacuum oven at 80°C for 5 hours to obtain urushiol-modified nano-silica.
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