A kind of preparation method of hollow fiber micro/ultrafiltration membrane

An ultrafiltration membrane and fiber technology, which is applied in the field of preparation of hollow fiber micro/ultrafiltration membranes, can solve the problems of high resistance, low membrane porosity, and low permeation flux, etc.

Active Publication Date: 2022-01-04
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of PVDF hollow fiber micro / ultrafiltration membranes by a single NIPS method requires a large number of process parameters to be adjusted. The porosity of the membrane is low, the resistance is large, and the permeation flux is low; when the TIPS method is used to prepare PVDF hollow fiber membranes, the dissolution temperature of the polymer is required. Very high, usually higher than the melting point of PVDF, reaching above 180°C, high energy consumption, and most of the solvents used to dissolve polymers need to be extracted with organic solvents, the process is complicated and the environment is polluted

Method used

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  • A kind of preparation method of hollow fiber micro/ultrafiltration membrane

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Experimental program
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Effect test

Embodiment 1

[0030] According to the high molecule PVDF mass content of 12%, the mass content of the second polymer polyvinylpyrrolidone (PVP) is 12%, the solvent DMAC mass content is 68%, and the molecular pore agent is magnesium chloride. The percentage content was 8% to configure a PVDF cast film, first dissolved in DMAC, first added PVDF and PVP, stirred at 40 ° C constant temperature dissolution to form a completely uniform PVDF cast film solution, and stand stouled. Thereafter, the above-mentioned preformed PVDF cast film solution extruded into the spinning hollow fiber in the spinneret of the two-channel structure at 40 ° C, the inner layer channel is a core liquid passage, and the outer layer channel is a cast film solution. The channel, the core is 90 ° C, the flow rate of the cast film solution and the core and the spinning speed, and in the air segment, it is immersed in an outer gel bath of 90 ° C after 1 second, and the primary ecosystem is separated, from fluid The film is solidi...

Embodiment 2

[0033] According to the high molecule PVDF mass content of 16%, the mass content of the second polymer polyvinylpyrrolidone (PVP) is 4%, the solvent DMAC mass content is 72%, and the mass of magnesium chloride in small molecule The percentage content was 8% to configure the PVDF cast film solution, first dissolved in magnesium chloride in DMAC, and then PVDF and PVP were added, stirred at a constant temperature dissolved in 45 ° C to form a completely uniform PVDF cast film solution, and stand stamped. Thereafter, the above-mentioned PVDF cast film fluid extruded out of the spun hollow fiber in the spinneret of 45 ° C, the inner layer channel as a core channel, and the outer layer channel is a cast film solution. The passage, the core liquid is 45 ° C, the flow rate of the cast film solution and the core, and the spinning speed, directly immersed in an outer gel bath water, and the primary ecosystem is separated, and the film is solidified from the liquid phase, and then The film ...

Embodiment 3

[0036] According to the high molecule PVDF mass content of 12%, the mass content of the second polymer polyvinylpyrrolidone (PVP) is 4%, and the content of solvent DMAC is 73%, and the mass of magnesium chloride of small molecules. The percentage content is 11% to configure the PVDF cast film solution, first dissolve the magnesium chloride in DMAC, then add PVDF and PVP, stirring heating at a constant temperature dissolution of 35 ° C to form a completely uniform PVDF cast film solution, and stand stamp. Thereafter, the prepared PVDF cast film liquid extruded out of the spun hollow fiber in the spinneret of the three-channel structure at 35 ° C, the inner layer channel is a core liquid passage, and the core is 93 ° C. The intermediate layer channel is a cast film liquid passage. The outermost channel is a gel dielectric passage, a water of the gel medium, controls the flow rate of the cast film solution, the outermost gel medium, and the spinning velocity, After 5 seconds of the a...

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Abstract

The invention discloses a method for preparing a hollow fiber micro / ultrafiltration membrane, which is mainly obtained by preparing a polymer membrane casting solution system with a low critical solution temperature and forming a membrane at a suitable spinneret and gel bath temperature. Hollow fiber micro / ultrafiltration membrane with easily adjustable structure. The polymer film casting solution of the present invention is homogeneously stable at low temperature, but phase separation occurs at high temperature, and the corresponding film forming mechanism is different from the traditional thermally induced phase separation method. The novel structural hollow fiber membrane of the invention has the characteristics of large flux and high strength.

Description

Technical field [0001] The present invention belongs to the technical field of polymer separation membrane, particularly relates to a method of preparing hollow fiber microfiltration / ultrafiltration membranes. Background technique [0002] Microfiltration and ultrafiltration (abbreviation: micro / ultrafiltration) membrane separation technology are widely used material was separated by filtration, concentrated and purified by purification art. Common forms of micro / ultrafiltration membrane has a flat and hollow fiber type. The hollow fiber membrane module having a large filling density, capacity advantages have been widely used. Preparation of vinyl fluoride (PVDF), polyvinylidene with micro / ultrafiltration hollow fiber membranes in solvent resistance, acid resistance, ultraviolet resistance and weather resistance, etc. outstanding performance cleaning. Preparation PVDF hollow fiber membranes mainly to phase separation, is typically divided into a non-solvent induced phase ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
CPCB01D67/0002B01D69/08B01D71/34
Inventor 肖通虎陈伟
Owner NINGBO UNIV
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