Method for producing hollow fiber film

A fiber membrane and hollow technology, which is applied in the field of hollow fiber membrane production, can solve the problems of small water permeability of membrane, uneven pore size distribution of porous membrane, and inability to meet needs, etc., and achieve the effect of uniform pore formation.

Inactive Publication Date: 2007-01-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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;

Method used

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  • Method for producing hollow fiber film
  • Method for producing hollow fiber film

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: with 1500 gram calcium carbonate (2~5 microns of particle diameter) particle, 2000 gram polyvinylidene fluoride resin, 500 gram polyethylene glycol 20000, 100 gram soil temperature-20, 1500 gram dibutyl phthalate The ester is uniformly dispersed at 220°C, blended and granulated, and melt-spun. Soak in 10wt% hydrochloric acid aqueous solution for 2 hours to remove calcium carbonate in the polyvinylidene fluoride hollow fiber, and soak in isopropanol for 3 hours to remove dibutyl phthalate, and the obtained polyvinylidene fluoride hollow fiber porous membrane has an inner diameter of 0.4mm , outer diameter 0.6mm, rupture strength 0.91MPa, pure water transmission rate 1210L / m 2 ·h@0.1MPa 20℃, membrane separation pore size 0.10μm, porosity 74%.

Embodiment 2

[0038] Example 2: 500 grams of aluminum oxide 20-80 nanoparticles, 500 grams of polyvinylpyrrolidone, 2000 grams of polyvinylidene fluoride resin, 100 grams of Tween-80, and 1500 grams of diethylene glycol dimethyl ether were heated at 215 ° C. Twin-screw blending, melt spinning. Soak in 10wt% sodium hydroxide aqueous solution for 4 hours to remove aluminum oxide in polyvinylidene fluoride hollow fiber, soak in isopropanol for 3 hours to remove diethylene glycol dimethyl ether, and the obtained external pressure polyvinylidene fluoride hollow fiber The inner diameter of the porous membrane is 0.5mm, the wall thickness is 0.15mm, the rupture strength is 0.62MPa, and the pure water transmission rate is 1570L / m 2 ·h@0.1MPa 20℃, membrane separation pore size 0.20μm, porosity 78%.

Embodiment 3

[0040] Example 3: Blending 800 grams of calcium carbonate nanoparticles, 1800 grams of polyvinylidene fluoride resin, 780 grams of polyvinylpyrrolidone, 20 grams of fluorosurfactant FC-4, and 1000 grams of diethylene glycol dimethyl ether at 220 ° C Granulation, melt spinning. Soak in 10wt% hydrochloric acid aqueous solution for 2 hours to remove calcium carbonate in polyvinylidene fluoride hollow fibers, soak in isopropanol for 3 hours to remove diethylene glycol dimethyl ether, and obtain polyvinylidene fluoride hollow fiber porous membranes with an inner diameter of 0.9mm, Outer diameter 1.4mm, rupture strength 1.03MPa, pure water transmission rate 1510L / m 2 ·h@0.1MPa 20℃, membrane separation pore size 0.45μm.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08
Inventor 吕晓龙
Owner TIANJIN POLYTECHNIC UNIV
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