2 results about "Polysulfone" patented technology

The invention provides a preparation method of a nanofiltration film, belongs to the field of film separation material preparation, and solves the problems that the industrialized continuous preparation of the nanofiltration film with the molecular weight cut-off between 1500 and 20000 Daltons cannot be easily realized in the prior art. The preparation method of the nanofiltration film comprises the following steps: putting polysulfone and dimethylacetamide into a batching kettle, setting the temperature of heat transfer oil at 90-100 DEG C, stirring a casting solution until transparent, and transferring the casting solution to a storage tank; defoaming under vacuum the casting solution, and keeping the temperature of the casting solution constant for later use when the temperature of thecasting solution is reduced to use temperature; coating a non-woven fabric with a 30-50 micron supporting layer by the casting solution by casting and scraping, and curing and rinsing to obtain a supporting bottom film layer; after the supporting bottom film layer enters a water phase solution tank for infiltration and is extruded by an extrusion roller, using a cleaning solution to perform secondary cleaning treatment on the film surface of the supporting bottom film layer, and removing the residual water phase solution by a secondary extrusion roller; coating the film surface containing a water phase monomer with solvent oil containing organic monomers, and drying to obtain the nanofiltration dry film. The molecular weight cut-off of the nanofiltration film prepared by the method is between 1500 and 20000 Daltons.

The invention discloses a novel charged nanofiltration membrane for removing organic matter and a preparation method of the novel charged nanofiltration membrane. The preparation method comprises the following steps: (1) dissolving polysulfone resin into a mixture of DMF and ethylene glycol, and conducting stirring and degassing to obtain a resin membrane casting solution; (2) coating a non-woven fabric with the resin membrane casting solution, and performing phase inversion in deionized water to form pores, so as to obtain a porous polysulfone-based membrane; (3) preparing any one of a disodium hydrogen phosphate-citric acid buffer solution, a citric acid-sodium citrate buffer solution or an acetic acid-sodium acetate buffer solution; (4) adding chitosan, a piperazine monomer and an anti-pollution additive into the buffer solution, and uniformly conducting stirring to obtain a water-phase solution; (5) mixing trimesoyl chloride and isophthaloyl chloride, adding the mixture into an organic solvent, and uniformly conducting stirring to obtain an oil phase liquid; (6) cutting the porous polysulfone-based membrane, soaking the porous polysulfone-based membrane in the water-phase liquid, and removing the water-phase liquid on the surface of the porous polysulfone-based membrane after soaking; (7) conducting polymerizing in the oil phase liquid after soaking; and (8) after polymerization, conducting drying to obtain the novel charged nanofiltration membrane for organic matter removal.