Forming process of hollow fiber membrane

Abstract

The invention discloses a forming process of a hollow fiber membrane. The process includes the following steps that polyvinyl chloride resin is dissolved in a polar solvent, vinyl acetate, a dispersant and additives are added in sequence, stirring is conducted for dissolution for 15-20 h till nanoscale aluminum oxide and calcium carbonate particles are dispersed in the solution to form a uniform polyvinyl chloride casting membrane solution, and the obtained polyvinyl chloride casting membrane solution is defoamed; the prepared polyvinyl chloride casting membrane solution is put into a spinning kettle, the polyvinyl chloride casting membrane solution passes through an air layer through a spinning jet and then enters a coagulating bath for coagulating forming, and a nascent polyvinyl chloride hollow fiber membrane is obtained; the nascent polyvinyl chloride hollow fiber membrane is washed in flowing pure water; the washed nascent polyvinyl chloride hollow fiber membrane is spin-dried through a centrifugal device and then soaked in a mixed solution containing glycerol; finally, the nascent polyvinyl chloride hollow fiber membrane is spin-dried through the centrifugal device to remove part of mixture, taken out of the centrifugal device and then dried through a drying oven. The hollow fiber membrane is high in water flux, high in anti-fouling performance and high in strength, and the interception rate on particles with the average particle size of 0.15 micrometer is 98% or above.

Description

technical field

[0001] The invention relates to the field of polymer material molding, in particular to a molding process of hollow fiber membranes. Background technique

[0002] Polyvinyl chloride (PVC) is the earliest industrialized general-purpose plastic with the second largest output. It has excellent chemical stability, radiation resistance, mechanical strength, heat resistance and acid and alkali resistance. The most notable advantages of PVC are The price is lower than the above materials (about one-seventh of PVDF), the research in our country is relatively mature, and the variety is wide, which makes it have the potential to reduce the cost of the membrane first. However, PVC film also has disadvantages that cannot be ignored. The surface energy of PVC film is low, resulting in poor hydrophilicity of the film, which reduces the water flux of the film, and the thermal stability of PVC film is not good, resulting in deterioration of processing performance. Hard and ...