Hydrophilic polyethylene hollow fiber membrane and preparation method thereof

A fiber membrane and polyethylene technology, applied in the field of membrane separation, can solve the problems of difficult to control methods, easy blockage of hollow fiber membrane pores, harsh conditions for hydrophilic modification, etc., and achieve the effect of lasting hydrophilic effect.

Active Publication Date: 2011-05-25
盐城海普润科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a hydrophilic polyethylene hollow fiber membrane, which solves the problems in the prior art that the conditions for the h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Set the molecular weight to 2×10 6 Ultra-high molecular weight polyethylene, molecular weight 5×10 5 High-density polyethylene and diphenyl ether are mixed uniformly at a ratio of 15:10:75, melt-spun through a twin-screw extruder at 200°C to obtain a precursor hollow fiber membrane; use n-heptane to pump the diluent Clean it up to obtain a hydrophobic primary membrane; prepare a 1% cellulose diacetate-acetone solution, soak the primary membrane in it for 20 minutes, take it out, let the acetone evaporate and dry it in the air to obtain a hydrophilic hollow fiber membrane. The average pore size of the membrane is 0.39μm, and the pure water flux of 0.1MPa is 168L / m 2 .h.

Embodiment 2

[0047] Set the molecular weight to 8×10 5 High-density polyethylene and soybean oil are mixed evenly at a ratio of 22:78, and melt-spun at 180°C through a twin-screw extruder to obtain a precursor hollow fiber membrane; the diluent is extracted with ethanol, and after extraction , and the membrane filaments were dried to obtain a nascent membrane. Prepare a 3% cellulose diacetate-N,N-dimethylformamide solution, soak the nascent film in it for 40 minutes, take it out, and then soak it in a water bath to make the cellulose diacetate solidify and form. After the solvent is washed away, the membrane is taken out and dried to obtain a hydrophilic hollow fiber membrane. The average pore size of the membrane is 0.32μm, and the pure water flux of 0.1MPa is 134L / m 2 .h.

Embodiment 3

[0049] Set the molecular weight to 4×10 5 High-density polyethylene and phthalate are mixed uniformly in a ratio of 26:74, heated and melted at 170°C in a kettle, and spun under a nitrogen pressure of 0.05MPa to obtain a precursor hollow fiber membrane; Extract the diluent cleanly to obtain a hydrophobic primary film; configure 5% cellulose diacetate-N.N dimethylacetamide solution, soak the primary film in it for 15 minutes, take it out, and then soak it in a water bath to solidify the cellulose diacetate forming. After the solvent is washed away, the membrane is taken out and dried to obtain a hydrophilic hollow fiber membrane. The average pore size of the membrane is 0.20μm, and the pure water flux of 0.1MPa is 118L / m 2 .h.

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Abstract

The invention discloses a hydrophilic polyethylene hollow fiber membrane and a preparation method thereof. The hollow fiber membrane is prepared by the following method of: (1) previously preparing a hydrophobic primary polyethylene hollow fiber membrane; (2) preparing cellulose diacetate solution, wherein the concentration of the cellulose diacetate solution is 20 to 50 percent; and (3) soaking the primary polyethylene hollow fiber membrane into the cellulose diacetate solution prepared in the step (2), making the cellulose diacetate solution fully soak into pores of membrane yarns, and thenremoving the solvent of the cellulose diacetate solution to obtain the hydrophilic polyethylene hollow fiber membrane. The method is simple, feasible and easy to apply in the industry, can be continued, and can also reduce the cost; and the obtained hydrophilic polyethylene hollow fiber membrane can keep hydrophilic property for long time.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a hydrophilic polyethylene hollow fiber membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology. Compared with traditional separation technology, it has the advantages of high separation efficiency, low energy consumption and environmental friendliness. It is widely used in petrochemical, food, medicine, natural substance extraction and concentration and Wastewater treatment and other fields. Because membrane separation technology is also closely related to energy saving, environmental protection, and resource development, the role of membrane technology has attracted more and more attention from countries in today's world of energy and water shortages, and increasingly serious water and environmental pollution. [0003] In the field of membrane technolo...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D69/08
Inventor 吴杰李兰叶钢刘必前
Owner 盐城海普润科技股份有限公司
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