Method for producing hollow fiber film

Abstract

The melt spinning process of producing hollow fiber membrane includes the first mixing inorganic particle, polymer pore creating agent, surfactant and non-solvent to constitute spinning composition, heating the composition to temperature higher than the smelting point of the polymer, the subsequent extruding the melt through spinning head and cooling to form hollow fiber, and final eliminating the inorganic particle, polymer pore creating agent, surfactant and non-solvent to produce the hollow fiber membrane. The spinning composition consists of polymer 20-90 wt%, inorganic pore creating agent 5-50 wt%, polymer pore creating agent 1-30 wt%, surfactant 0.05-20 wt%, and organic non-solvent 1-60 wt%.

Description

technical field [0001] The present invention relates to a method for melt spinning hollow fiber membranes, more specifically, to a method for adding inorganic porogens, polymer porogens, surfactants and non-solvents to the film-forming polymer. , to form a spinning composition, mix uniformly and heat to above the melting temperature of the polymer, then extrude the melt in the spinning head, cool to form a film, and then remove the inorganic particles, polymer porogens, surfactants and A method for preparing hollow fiber membranes with high flux and uniform pore formation using a non-solvent. Background technique [0002] Hollow fiber membranes are mainly used for filtration or dialysis in various fields. [0003] When spinning pure polymer hollow fibers, it is easy to form a water-impermeable dense structure, and it is difficult to obtain porous hollow fibers, so they do not have the filtration function of porous membranes. [0004] The above problems can be solved by add...

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Problems solved by technology

In this method, uneven dispersion is likely to cause uneven pore size distribution of the formed porous membrane, and the water permeability of the membrane is small, which cannot meet the needs;

[0006] 2. In Japanese Patent Application Laid-Open No. 2002-253939, it is recorded that only film-forming polymers are used without additives, and the polymer is preformed into fibers and then stretched to cause pores. It is not easy to obtain high porosity, high water permeability, and pore size. Uniformly distributed hollow fiber membranes;

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