Authors: Nedeff Valentin, Sandu Andrei Victor, Nedeff Florin Marian, Sandu Ioan Gabriel, Barsan Narcis, Tătaru Laurenţiu, Sandu Ion
Company/Faculty/School: Vasile Alecsandri University of Bacau
The invention relates to a process for obtaining asymmetric polymeric membranes with permanent hydrophilicity, used in the ultrafiltration of water for the pharmaceutical and food industry. The process according to the invention consists in dispersing 0.3% of a mixture of silica nanoparticles and colloidal silver in a 98: 2 gravimetric ratio in a hydrophilic 1-methyl-2-pyrrolidone polymeric solvent, after When stirring, 30% polysulfone dispersed in polymeric solvent is added, mechanical stirring is continued at 240 rpm for 24 hours at room temperature, resulting in a homogeneous and stable dispersion, which is poured onto a nonwoven textile backing. yarns below 100 μ m, resulting in polymeric membranes with a thickness of 100 … 200 μ m and an asymmetric stratigraphic profile of pore diameter.