Large flux polyvinyl chlorid doughnut film, and its mfg. method

A technology of polyvinyl chloride and fiber membranes, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as difficult to achieve advanced treatment and reuse of wastewater, achieve membrane water permeability improvement, cost reduction, Good spinnability effect

Inactive Publication Date: 2003-05-21
DONGHUA UNIV
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Problems solved by technology

Although it has tried to increase the water permeability and molecular weight cut-off of the membrane on the basis of reducing costs, it is ...

Method used

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  • Large flux polyvinyl chlorid doughnut film, and its mfg. method
  • Large flux polyvinyl chlorid doughnut film, and its mfg. method

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Embodiment Construction

[0009] An embodiment of the present invention is a large flux polyvinyl chloride hollow fiber membrane suitable for advanced treatment of wastewater. General-purpose, low-cost polyvinyl chloride is used as a raw material, 1-methyl-2-pyrrolidone is used as a solvent, and polyethylene glycol with better porogenic properties is used as an additive, and the mass ratio of the solvent to the additive is controlled to 50 ~58:50~42. Dissolve various raw materials at a temperature of 60-95°C, and then prepare large-flux polyvinyl chloride hollow fiber membranes by dry-wet spinning method: the dry spinning length is 30-80cm, and the extrusion volume flow rate is 3-20ml / min, the temperature of the spinning solution is 25-85°C. The obtained hollow fiber membrane has a five-layer bidirectional asymmetric structure, which is an outer dense layer 1 , a finger-like hole support layer 2 , a sponge layer 3 , a finger-like hole layer 4 and an inner dense layer 5 . There are abundant pores in ...

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Abstract

The present invention relates to a large-flux polyvinyl chloride hollow fibre membrane and its preparation method. It uses polyvinyl chloride as raw material, uses I-methyl-2-pyrrolidone as solvent and uses polyethylene glycol as additive, and adopts dry-wet spinning process to implement said invention. The above-mentioned materials are dissolved at 60-95 deg.C, its dry spinning path is 30-80 cm,extrusion volume flow rate is 3-20 ml/min, and spinning solution temp. is 25-85 deg.C. Said hollow fibre membrane is made into five-layer bidirectional asymmetrical structure including outer compact layer, finger pore support layer, sponge layer, finger pore layer and inner compact layer, its water permeability is 500-900 L/sq.m.h, and its trapping molecular weight is 8-15 tea thousand.

Description

Technical field [0001] The invention relates to a polyvinyl chloride hollow fiber membrane and a preparation method thereof, in particular to a large flux polyvinyl chloride hollow fiber membrane and a preparation method thereof. Background technique [0002] With the development of industrialization, a large amount of domestic and industrial waste water is discharged into water bodies, which makes the water sources that human beings rely on increasingly polluted. On the other hand, the fresh water sources that can be provided on the earth are becoming more and more scarce, and more and more cities are included in water-scarce areas. Governments of all countries hope to improve the existing water quality through advanced treatment and reuse of industrial wastewater. resource utilization. All of these have made it difficult for traditional coagulation, sedimentation, filtration and disinfection treatment processes to meet increasingly stringent water quali...

Claims

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Application Information

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IPC IPC(8): B01D63/04
Inventor 奚旦立陈季华王军
Owner DONGHUA UNIV
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