PVDF method for manufacturing PVDF hollow fiber membrane having high fouling resistance

摘要

More particularly, the present invention relates to a dope solution for forming a pore layer containing PVDF and an inorganic substance, a dope solution for forming a support layer containing PVDF, Preparing a coagulating solution; Transferring the dope solution for forming the pore layer, the dope solution for forming the support layer, and the internal coagulating solution for hollow formation to a triple tube spinning nozzle, and vibrating the triple tube spinning nozzle by the vibration means; Spraying or discharging the dope solution for forming the pore layer, the dope solution for forming the supporting layer, and the internal coagulating solution from the outermost nozzle of the triple tube spinning nozzle; A first phase transformation of the pore layer-forming dope solution and the support layer-forming dope solution in an air layer; And dipping the dope solution for forming the pore layer and the dope solution for forming the support layer into a coagulation bath to transform the second phase and crystallize the solution. According to this, by forming protruding patterns on the surface of the PVDF hollow fiber membrane while maintaining chemical resistance and mechanical strength, which are inherent properties of the PVDF polymer material, the effective area of the PVDF hollow fiber membrane, In addition to increasing the efficiency, it is possible to increase the resistance to membrane contamination by reducing the contact area of PVDF hollow fiber membrane surface and contaminants.