Method for producing hollow fiber film

Abstract

The melt spinning process of producing hollow fiber membrane includes the first mixing glass fiber with 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 high strength hollow fiber membrane. The spinning composition consists of polymer 20-90 wt%, glass fiber 0.5-20 wt%, inorganic pore creating agent 5-50 wt%, polymer pore creating agent 2-30 wt%, surfactant 2-60 wt%, and organic non-solvent 10-60 wt%.

Description

technical field [0001] The invention relates to a method for producing a hollow fiber membrane by melt spinning. In the method, a non-melting fiber such as glass fiber is added to a film-forming polymer melt to obtain a hollow fiber membrane with high strength and uniform hole formation. Background technique [0002] Hollow fiber membranes are mainly used for filtration or dialysis in various fields. The hollow fiber membrane melt-spinning method of the present invention is to form a spinning composition with non-melting fibers such as glass fibers and inorganic particles, polymer porogens, surfactants and non-solvents, mix them uniformly and heat them above the melting temperature of the polymer, Then the melt is extruded in the spinning head, cooled to form a hollow fiber, and the hollow fiber membrane is made by removing inorganic particles, polymer porogens, surfactants and non-solvents. [0003] When spinning pure polymer hollow fibers, it is easy to form a water-imper...

AI Technical Summary

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;

[0005] 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;

[0008] The hollow fiber membranes spun by the above existing technologies have weak film-forming strength and cannot meet the requirements of high strength.