A kind of preparation method of polymer porous membrane for removing water body pollutants
A technology of water pollutants and polymer membranes, applied in the field of separation membranes, can solve the problems of easy loss of components of cyclodextrin and its derivatives, complicated operation process, and inability to remove, so as to facilitate large-scale continuous separation and automatic operation, The preparation process is simple and the separation speed is fast
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[0045] 3) Preparation of polymer porous membrane: the casting solution prepared in step 2 is used to prepare a polymer porous membrane, and the polymer porous membrane is a polymer flat membrane or a polymer hollow fiber membrane.
[0046] On the basis of the above scheme, the polymer membrane material described in step 1) is polysulfone, polyethersulfone, polyvinylidene fluoride, phthalazine polyether sulfone ketone, polyacrylonitrile, polyvinyl alcohol, polyether ether Any one of ketone, polyetherimide or polyvinyl chloride or a combination of two or more in any ratio, preferably polysulfone, polyethersulfone, polyvinylidene fluoride or phthalazine polyethersulfone ketone Any one or any combination of two or more in any ratio.
[0047] On the basis of the above scheme, the porogen described in step 1) is any one or two or more of water-soluble polymer polyvinylpyrrolidone, polyethylene glycol, formic acid, acetic acid, nano-silica or titanium dioxide. Proportioned compositi...
Embodiment 1
[0068]Dissolve 8 g of the dried polymer membrane material polysulfone and 0.1 g of the porogen nano-titanium dioxide in 86.9 g of N,N-dimethylacetamide organic solvent, heat up, and fully stir at 50°C until the polymer The membrane material is completely dissolved, and the temperature continues to rise under stirring conditions. When the temperature rises to 80°C, add 5g of α-cyclodextrin to the above solution, continue stirring to fully swell and dissolve, and prepare a mixed solution;
[0069] Maintain the temperature of the mixed solution at 80°C, add 5g of cross-linking agent epichlorohydrin to the mixed solution, conduct a cross-linking reaction at 80°C for 5 hours, let stand, filter, and vacuumize to defoam to prepare the casting film;
[0070] First take the weight per unit area as 71.5g / m 2 , The polyester non-woven fabric base film with a pore size of 23.31 μm is installed on the film scraping machine, and then the prepared casting solution is poured into the trough o...
Embodiment 2
[0072] Take 14g of the dried polymer membrane material polyethersulfone and 2g of polysulfone, a porogen consisting of 7g of polyethylene glycol and 3g of acetic acid, dissolve in 66g of N-methylpyrrolidone organic solvent, heat up, at 40°C Stir fully under low temperature until the polymer film material is completely dissolved, continue to heat up under stirring conditions, when the temperature rises to 50°C, add 8g of β-cyclodextrin to the above solution (such as figure 1 , 2 shown), continue to stir to make it fully swell and dissolve, and prepare a mixed solution;
[0073] Maintain the temperature of the mixed solution at 50°C, add 25g of cross-linking agent 1,2-ethylene glycol diglycidyl ether to the mixed solution, conduct a cross-linking reaction at 50°C for 12 hours, stand still, filter, and vacuumize to defoam to obtain the casting solution;
[0074] First take the weight per unit area as 36.9g / m 2 , The polyester non-woven fabric base film with a pore size of 23.2...
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