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Composite hollow fiber membrane and preparation method thereof

A fiber membrane and hollow technology, which is applied in the field of composite hollow fiber membrane and its preparation, can solve the problems of limited application field and difficult maintenance, and achieve the effects of tight intermolecular bonding, enhanced strength, and extended service life

Active Publication Date: 2010-07-07
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the filtration pressure is high and the filtration environment is poor, it is often difficult to maintain the structure in which several fibers and ribs are entangled together, and its application field is still limited.

Method used

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  • Composite hollow fiber membrane and preparation method thereof
  • Composite hollow fiber membrane and preparation method thereof
  • Composite hollow fiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Pore-forming component: polyphenylene sulfide, pore-forming agent: copolyester PET, support component: polyphenylene sulfide

[0045] Using a buss mixer, 9 kg of polyphenylene sulfide and 1 kg of copolyester PET were blended and granulated at 300° C. to prepare 10 kg of pore-forming components. Take 1 kg of pure polyphenylene sulfide as the supporting component and the pore-forming component to extrude on a composite spinning machine at 310°C, and compound at 315°C to prepare a composite polyphenylene sulfide with a composite ratio of 20:80 between the supporting component and the pore-forming component. Phenylsulfide hollow fibers. The fiber was stretched and set, the stretching temperature was 80°C, the draw ratio was 4.5 times, the stretching speed was 500m / min, and the setting temperature was 190°C; then the fiber was treated in 20% sodium hydroxide lye at 90°C for 24 Hours to dissolve the water-soluble PET in the pore-forming component to form a hollow fiber membr...

Embodiment 2

[0047] Pore-forming component: polyphenylene sulfide, pore-forming agent: silica, support component: polyphenylene sulfide

[0048] The silicon dioxide powder is selected to have a particle diameter of 5nm-200nm, preferably 5nm-50nm. Using a twin-screw extruder, 9 kg of polyphenylene sulfide and 1 kg of silicon dioxide were blended and granulated at 290° C. to prepare 10 kg of a pore-forming component. Take 1 kg of pure polyphenylene sulfide as the support component and the pore-forming component to extrude on a composite spinning machine at 315° C., and compound at 320° C. to prepare a composite polyphenylene sulfide with a support component and pore-forming component composite ratio of 10:90. Phenylsulfide hollow fibers. The fiber is stretched and set, the stretching temperature is 90°C, the draw ratio is 3.5 times, the stretching speed is 600m / min, and the setting temperature is 200°C; then the fiber is soaked in 10% potassium hydroxide solution at room temperature for 8 h...

Embodiment 3

[0050] Pore-forming component: polyphenylene sulfide, pore-forming agent: calcium carbonate, supporting component: polyphenylene sulfide;

[0051] The calcium carbonate powder is selected to have a particle diameter of 5nm to 200nm, preferably 5nm to 50nm. Using a buss screw, 9 kg of polyphenylene sulfide and 1 kg of calcium carbonate were blended and granulated at 300° C. to prepare 10 kg of a pore-forming component. Take 1 kg of pure polyphenylene sulfide as the supporting component and the pore-forming component to extrude on a composite spinning machine at 315 ° C, and compound at 325 ° C to prepare a composite polyphenylene sulfide with a composite ratio of supporting component and pore-forming component of 30:70. Phenylsulfide hollow fibers. The fiber is subjected to stretching and setting treatment, the stretching temperature is 90°C, the stretching ratio is 3 times, the stretching speed is 10m / min, and the setting temperature is 200°C; then the fiber is soaked in 10% ...

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Abstract

The invention relates to a composite hollow fiber membrane, single fiber of the composite hollow fiber membrane consists of a hole-forming component and a support component, wherein the support component is continuously distributed along the axial direction of each fiber in the composite hollow fiber membrane. The hole-forming component and the support component are one or any combination of a plurality of types of thermoplastic resin material, which are polyphenylene sulfide preferentially. The content by weight of the support component accounts for 2-90% of the total weight of the fiber membrane, which is 5%-8% preferentially, and 10-80% more preferentially. The preparation method of the composite hollow fiber membrane comprises the following steps: blending the hole-forming component with a hole-forming agent, carrying out granulation, then respectively extruding with the support component, and carrying out composition; carrying out drawing and heat setting treatment on obtained composite fibers obtained by composition; soaking the composite fibers after drawing and heat setting in a solvent for removing the hole-forming agent; and carrying out aerobic thermal cross-linking treatment on the composite fibers after removing the hole-forming agent, and obtaining the composite hollow fiber membrane. The composite hollow fiber membrane has the advantages of high temperature resistance, acid-alkali resistance and a wide range of applications.

Description

technical field [0001] The invention relates to a fiber membrane and a preparation method thereof, in particular to a composite hollow fiber membrane and a preparation method thereof. Background technique [0002] In recent years, the filtration method using porous hollow fiber membrane has been widely popularized in filtration due to its unique advantages. At present, the solution method is mostly used to spin through a ring-shaped hollow sleeve-type spinneret, and then it is prepared by stretching to form holes or thermally induced phase separation. [0003] For example, patent application 200680037850.2 discloses such a prepared hollow fiber membrane, which is a nozzle for hollow fiber molding using more than two annular extrusion ports configured in concentric circles. Layer melt extrusion, the molten kneading products of thermoplastic resins and organic liquids with different compositions are extruded in a ring shape from adjacent ring-shaped extrusion ports, cooled an...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D69/12
CPCB01D67/003B01D69/1212
Inventor 吴鹏飞崔宁黄庆李杰史贤宁王颖李泽民
Owner CHINESE TEXTILE ACAD
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