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Hollow fiber ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane and fiber technology, applied in the field of membrane separation, can solve the problems of difficult cleaning and organic pollution, and achieve the effects of less pollution, high water flux, and high operating temperature

Active Publication Date: 2019-01-11
中津科创(厦门)膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrophobicity of the surface of polyvinylidene fluoride and other hydrophobic membranes, it is easy to be polluted by organic substances and difficult to clean, which limits its popularization and application.

Method used

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  • Hollow fiber ultrafiltration membrane and preparation method thereof
  • Hollow fiber ultrafiltration membrane and preparation method thereof
  • Hollow fiber ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The present invention also provides the preparation method of above-mentioned hollow fiber ultrafiltration membrane, comprises the following steps:

[0042] 1) mixing the raw materials in the mass parts by mass to obtain the spinning casting solution;

[0043] 2) Extrude the spinning casting solution obtained in the step 1) to form a film, draw and solidify in sequence to obtain a nascent hollow fiber ultrafiltration membrane;

[0044] 3) The nascent hollow fiber ultrafiltration membrane obtained in the step 2) is soaked in water, glycerin aqueous solution and dried in sequence to obtain a hollow fiber ultrafiltration membrane.

[0045] In the invention, the raw materials in the mass parts are mixed to obtain the spinning casting liquid.

[0046] In the present invention, the mixing is preferably first mixed with lithium chloride, organic porogen and organic solvent to obtain the first mixed solution; then the first mixed solution is mixed with polym-phenylene isophtha...

Embodiment 1

[0069] Raw material formula in the embodiment 1 of table 1

[0070] components

Mass percentage (%)

PMIAs

14

lithium chloride

4

DMAC

82

[0071] 1) Add lithium chloride to N,N-dimethylacetamide solvent (DMAC), stir at 45°C to completely dissolve, then add poly-m-phenylene isophthalamide fiber (PMIA), at 6°C Stir for 4 hours to form a homogeneous solution to obtain a casting solution; pour the casting solution into a closed reaction kettle, and vacuum defoam to obtain a spinning casting solution;

[0072] 2) Filtrating the spinning casting solution through an iron mesh under 0.1MPa nitrogen pressure, extruding from a spinneret to form a film, evaporating, gravity pulling, and gel solidification to obtain a nascent hollow fiber ultrafiltration membrane.

[0073] 3) Soak the obtained nascent hollow fiber ultrafiltration membrane in pure water for 48 hours, then soak it in 50 wt% glycerin aqueous solution for 48 hours, and finally ta...

Embodiment 2

[0075] Raw material formula in table 2 embodiment 2

[0076]

[0077]

[0078] 1) Add lithium chloride and polyethylene glycol (PEG400) to N,N-dimethylacetamide solvent (DMAC), stir and dissolve completely at 60°C, then add polym-phenylene isophthalamide Fiber, stirred at 80°C for 4 hours to form a homogeneous solution to obtain a casting solution; pour the casting solution into a closed reaction kettle, and vacuum defoam to obtain a spinning casting solution;

[0079] 2) Filtrating the spinning casting solution through an iron mesh under 0.3MPa nitrogen pressure, extruding from a spinneret to form a film, evaporating, pulling, and gel curing to obtain a nascent hollow fiber ultrafiltration membrane.

[0080] 3) Soak the obtained nascent hollow fiber ultrafiltration membrane in pure water for 45 hours, then soak it in 50 wt% glycerol aqueous solution for 50 hours, and finally take out the wet ultrafiltration membrane and dry it to obtain a hollow fiber ultrafiltration me...

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Abstract

The invention provides a hollow fiber ultrafiltration membrane, belonging to the technical field of membrane separation. The hollow fiber ultrafiltration membrane is prepared from the following raw materials in parts by mass: 10-20 parts of poly-m-phenylene isophthalamide fibers, 0.1-10 parts of lithium chloride, 64-90.1 parts of an organic solvent; and the thickness of the hollow fiber ultrafiltration membrane is 0.25mm-0.32mm, the bore diameter is 30nm-50nm, the porosity is 70%-85%, and the surface contact angle of the membrane is 60-75 degrees. According to the hollow fiber ultrafiltrationmembrane, the poly-m-phenylene isophthalamide fibers have hydrophilia and are unlikely to be polluted in the operation process of the membrane. The hollow fiber ultrafiltration membrane is relativelyhigh in BSA reject rate, water flux and operation temperature.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a hollow fiber ultrafiltration membrane and a preparation method thereof. Background technique [0002] Ultrafiltration membrane is a microporous filtration membrane with uniform pore size and rated pore size below 0.01 micron. Appropriate pressure is applied to one side of the membrane to screen out solute molecules smaller than the pore size to separate particles with a molecular weight greater than 500 Daltons and a particle size greater than 10 nanometers. [0003] Hollow fiber ultrafiltration membrane is a kind of ultrafiltration membrane. It is the most mature and advanced technology in ultrafiltration technology. The tube wall of the hollow fiber ultrafiltration membrane is covered with micropores, and the molecular weight of the pore size that can intercept the substance is relatively large, and the molecular weight interception can reach several thousand to...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/60B01D67/00
CPCB01D67/0002B01D69/08B01D69/087B01D71/60
Inventor 张凯松姜钦亮
Owner 中津科创(厦门)膜科技有限公司
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