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Method for preparing hollow fiber membranes by using thermally induced phase separation (TIPS) process

A technology of fiber membrane and thermotropic phase, applied in the field of polyvinylidene fluoride porous hollow fiber membrane and its preparation method, can solve the problems of unsatisfactory ultra- and microfiltration membrane effects and uneven distribution of membrane pore sizes that cannot meet the requirements of industrial production and other problems, to achieve the effect of good chemical cleaning resistance and hydrophilicity, excellent anti-pollution ability, and good anti-pollution characteristics

Inactive Publication Date: 2012-11-14
苏州膜华材料科技有限公司
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  • Claims
  • Application Information

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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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  • Method for preparing hollow fiber membranes by using thermally induced phase separation (TIPS) process
  • Method for preparing hollow fiber membranes by using thermally induced phase separation (TIPS) process
  • Method for preparing hollow fiber membranes by using thermally induced phase separation (TIPS) process

Examples

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Embodiment 1

[0051] A blended polymer composed of PVDF drying resin with a mass percentage of 35% and polymethyl methacrylate drying resin with a mass percentage of 2.1%, added to diethylene glycol butyl ether acetate and tetraethylene glycol In the mixed solvent, the mass percentage of diethylene glycol butyl ether acetate is 38.7%, and the mass percentage of tetraethylene glycol is 24.2%. 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 125°C, 140°C, 155°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 an...

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Abstract

The invention relates to a polyvinylidene fluoride (PVDF) porous hollow fiber membrane and a preparation method thereof. The fiber membrane comprises the following components in percentage by mass: 25 to 40 percent of polyvinylidene fluoride (PVDF) serving as a first polymer P1; 0 to 3 percent of polymethylmethacrylate (PMMA) serving as a second polymer P2; 38 to 54 percent of acetic diethylene glycol ether ester serving as a first diluent D1; and19 to 25 percent of tetraglycol serving as a second diluent D2. The PVDF hollow fiber ultra filter membrane prepared by using the method of the invention has the advantages of excellent chemical stability, pollution resistance and high strength, and can provide high-performance membrane products for MBR crafts.

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 prepared by a thermotropic phase method 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...

Claims

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Application Information

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