Polyvinylidene fluoride/nano-silicon oxide hybrid membrane and preparation method thereof
A technology of nano-silica and polyvinylidene fluoride, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of adsorption pollution, shorten the service life of membranes, etc., and achieve enhanced hydrophilicity and good permeability , the effect of a wide range of application prospects
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[0025] Example 1
[0026] Take 12wt% of PVDF, 3wt% of porogen PVP K90 and 1wt% of porogen LiCl into a dry three-necked flask, mix the solvent with a mass ratio of NMP:DMAc of 8:2 and pour it into the same three-necked flask. In the three-necked flask, insert the stirring rod into the oil bath and stir, and set the parameter to 45°C, 200r / min. During the stirring process, prepare ethyl orthosilicate (TEOS) with a mass ratio of 17:1 and γ―(2,3-glycidoxy)propyltrimethoxysilane (KH560) and mix uniformly to obtain a mixed solution; The content of TEOS is 1 wt%; the above-mentioned mass percentage is the mass percentage of each raw material in the total mass of all raw materials. Under stirring conditions, slowly drip into the three-necked flask, and then slowly drip 0.1% (accounting for the volume fraction of the mixed solution) prepared 0.15mol / L hydrochloric acid solution. Stir for about 1 hour under this condition to make the polymer swell, then stir at 65°C, 280r / min for 15 hour...
Example Embodiment
[0027] Example 2
[0028] Take 14wt% PVDF, 4wt% porogen PVP K90 and 2wt% porogen LiCl into a dry three-necked flask, mix the solvent with a mass ratio of NMP:DMAc of 7:3 and pour it into the same three-necked flask. In the three-necked flask, insert the stirring rod into the oil bath and stir, and set the parameter to 50°C, 200r / min. During the stirring process, prepare ethyl orthosilicate (TEOS) and γ-propyl methacrylate trimethoxysilane (KH570) with a mass ratio of 15:1 to obtain a mixed solution; the content of TEOS is 3wt% ; The above-mentioned mass percentage is the mass percentage of each raw material in the total mass of all raw materials. Under stirring conditions, slowly drop into the three-necked flask, and then slowly drop 0.3% (accounting for the volume fraction of the mixed solution) prepared 0.5mol / L hydrochloric acid solution. Stir for about 1 hour under this condition to make the polymer swell, then stir at 70°C, 280r / min for 18 hours, take out the polymer, stan...
Example Embodiment
[0029] Example 3
[0030] Take 16wt% of PVDF, 5wt% of porogen PVP K90 and 3wt% of porogen LiCl into a dry three-necked flask, mix the solvent with a mass ratio of NMP:DMAc of 6:4 and pour it into the same three-necked flask. In the three-necked flask, insert the stirring rod into the oil bath and stir, and set the parameter to 55°C, 200r / min. During the stirring process, prepare ethyl orthosilicate (TEOS) and 3-aminopropyltriethoxysilane (KH550) with a mass ratio of 13:1 and mix uniformly to obtain a mixed solution; wherein the content of TEOS is 5wt%; The mass percentage is the mass percentage of each raw material in the total mass of all raw materials. Under stirring conditions, slowly drip into the three-necked flask, and then slowly drip 0.5% (accounting for the volume fraction of the mixed solution) of 1 mol / L hydrochloric acid solution. Stir for about 1 hour under this condition to swell the polymer, then stir at 75° C., 280 r / min for 21 hours, take out the polymer, stand...
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