A kind of silicon dioxide nanosurfactant and preparation method thereof
A technology of surfactant and silicon dioxide, which is applied in the field of nanomaterials, can solve the problem of not being able to show strong hydrophilicity of particles
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Embodiment 1
[0035] A preparation method of silicon dioxide nanosurfactant, comprising the following steps:
[0036] (1) Add 40 mmol tetraethyl orthosilicate to a mixed solution of 80 mL ethanol and 120 mL water, and stir evenly at 40°C to form a hydrolysis system;
[0037] (2) Under the condition of stirring at 40°C, add an aqueous solution of ammonium bicarbonate dropwise to adjust the pH value between 9 and 10, then raise the temperature to 60°C and react at a constant temperature for 1 h, then add 5 mmol hexamethyldisilazane and 2 mmol N,N-dimethyl-3-aminopropyltrimethoxysilane, constant temperature reaction for 2 h, to obtain a dispersion of surface-modified nano-silica;
[0038] (3) Take 100 mL from the dispersion of surface-modified nano-silica obtained in step (2), and add 0.8 g of sodium hydroxide to obtain a reaction system;
[0039] (4) Stir the reaction system at 60°C for 3 h to obtain the nano-silica surfactant dispersed in the solution (silica nano-surfactant dispersion).
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Embodiment 2
[0042] A preparation method of silicon dioxide nanosurfactant, comprising the following steps:
[0043] (1) Add 60 mmol of Na 2 SiO 3 ·5H 2 O was added to the reaction flask, and 200 mL of deionized water was added, and after stirring at 20°C, a hydrolysis system was formed;
[0044] (2) Under the condition of stirring at 20°C, add sulfuric acid dropwise to adjust the pH value to 9, raise the temperature to 80°C for 1 h, add 6 mmol of chlorotrimethylsilane and 2 mmol of vinyltriisopropoxysilane, and keep the temperature constant React for 4 h to obtain a dispersion of surface-modified nano-silica;
[0045] (3) Filtrate and wash the dispersion of surface-modified nano-silica obtained in step (2) to obtain a filter cake, disperse the filter cake in deionized water to a total weight of 150 g, and then add 2.6 g of potassium hydroxide, get the reaction system;
[0046] (4) Stir the reaction system at 80°C for 4 h to obtain the nano-silica surfactant dispersed in the solution ...
Embodiment 3
[0049] A preparation method of silicon dioxide nanosurfactant, comprising the following steps:
[0050] (1) Add 40 mmol of Na 2 SiO 3 ·5H 2 O was added to the reaction flask, and 100 mL of deionized water was added, and after stirring at 20°C, a hydrolysis system was formed;
[0051] (2) Heat up to 50°C, add NH dropwise under stirring condition 4 Adjust the pH of the Cl solution to 7, add 22.5mmol N,N-dimethyl-3-aminopropyltrimethoxysilane, heat up to 80°C and react at a constant temperature for 2 hours to obtain a dispersion of surface-modified nano-silica;
[0052] (3) Adding 1.4 g of sodium hydroxide to the dispersion of surface-modified nano-silica obtained in step (2) to obtain a reaction system;
[0053] (4) Stir the reaction system at 80°C for 4 h to obtain the nano-silica surfactant dispersed in the solution (silica nano-surfactant dispersion).
[0054] The obtained silica nano-surfactant was dispersed in water with a mass fraction of nano-surfactant of 0.2%, and ...
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