Hollow-fiber membrane with density gradient pores and preparation method

A fiber membrane and hollow technology, which is applied in the field of polyvinylidene fluoride porous hollow fiber membrane and its preparation method, can solve the problems such as the inability to meet the requirements of industrial production, the unsatisfactory effect of ultra- and microfiltration membranes, and the uneven distribution of membrane pore diameters. , to achieve the effect of good chemical cleaning resistance and hydrophilicity, excellent anti-pollution ability, and good anti-pollution characteristics

Inactive Publication Date: 2010-11-24
苏州膜华材料科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the commercialized ultra- and microfiltration membranes are not ideal and cannot meet the requirements of industrial production.
On the other hand, at present, most ultra- and microfiltration membranes are prepared by non-solvent-induced phase separation. Most of the produced membranes contain finger-shaped large cavity structures, and the membrane pore size distribution is uneven and the strength is poor. It is easy to break when used in sewage. Membrane life is short, not suitable for application in membrane bioreactor process

Method used

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  • Hollow-fiber membrane with density gradient pores and preparation method
  • Hollow-fiber membrane with density gradient pores and preparation method
  • Hollow-fiber membrane with density gradient pores and preparation method

Examples

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Embodiment 1

[0052] A blended polymer composed of 38% by mass PVDF drying resin and 2.3% by mass polyvinylpyrrolidone drying resin, added to a mixed solvent composed of ethylene glycol diacetate and 1,3-propylene glycol Among them, the mass percentage of ethylene glycol diacetate is 32.6% (wt), and the mass percentage of 1,3-propanediol is 27.1%. The above mixture was added into a stirred tank, stirred and dissolved at a temperature of 180° C. and a rotational speed of 120 rpm for 24 hours, and then cooled and granulated in air to obtain a blended raw material. The previously prepared blend was fed into the twin-screw extruder at a feed rate of 8 kg / h. The temperatures in zones 1-8 of the extruder were 120°C, 135°C, 165°C, 170°C, 180°C, 180°C, 180°C, 170°C respectively, and the screw speed was 120 rpm. After the mixed material is melted and extruded in a twin-screw machine, it is extruded through a filter and a spinning pump into a four-hole annular die to make a hollow as-spun fiber. The...

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Abstract

The invention relates to a polyvinylidene fluoride porous hollow-fiber membrane and a preparation method thereof. The membrane is prepared from the following formula ingredients in percentage by mass: 25 to 45 percent of polyvinylidene fluoride (PVDF) serving as a first polymer P1, 0 to 3 percent of polyvinylpyrrolidone (PVP) serving as a second polymer P2, 32 to 45 percent of ethylene acetate serving as a first diluting agent D1 and 15 to 36 percent of 1,3-propanediol serving as a second diluting agent D2. The PVDF hollow-fiber ultrafiltration and microfiltration membranes prepared by the method have the advantages of superior chemical stability, pollution resistance and high strength and can provide a high-performance membrane product for the MBR process.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride (PVDF) porous hollow fiber membrane and a preparation method thereof, in particular to a polyvinylidene fluoride (PVDF) porous hollow fiber membrane with density gradient holes and a preparation method thereof. Background technique [0002] Membrane bioreactor process (MBR) is a new and efficient sewage treatment technology, which can realize biocatalytic reaction and separation of water and degraded substances at the same time, so that water resources can be regenerated and water quality standards can be realized. It is a contemporary advanced, high-efficiency and low-energy-consumption wastewater advanced treatment and new technology for regeneration and reuse. Among them, the preparation of ultrafiltration membranes and microfiltration membranes with high strength, good anti-pollution performance and low cost is the core technology of membrane bioreactor technology. However, most of the commerciali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08
Inventor 奚韶锋洪耀良陈翠仙
Owner 苏州膜华材料科技有限公司
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