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A kind of polymer hollow fiber membrane with large flux symmetrical structure and preparation method thereof

A technology with symmetrical structure and large flux, applied in the field of membrane separation, can solve the problems of low porosity of polymer membrane, easily damaged separation layer, low separation accuracy, etc., achieve low elution rate, and facilitate large-scale development and production , the effect of high separation accuracy

Active Publication Date: 2019-11-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of polymer membrane has low porosity, low flux, wide pore size distribution, low separation accuracy, and the separation layer is easily damaged and cannot be repaired.

Method used

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  • A kind of polymer hollow fiber membrane with large flux symmetrical structure and preparation method thereof
  • A kind of polymer hollow fiber membrane with large flux symmetrical structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 35 grams of polysulfone and 65 grams of N,N'-dimethylacetamide into the reaction kettle, blow nitrogen, and keep stirring at 130°C until fully dissolved; add 1.75 grams of acrylic acid (5% of the mass of polysulfone), vinyl 1.75 grams of triethoxysilane (100% of the quality of acrylic acid), 0.175 grams of azobisisobutyronitrile (10% of the quality of acrylic acid), 3.5 grams of water (20% of the quality of acrylic acid), reacted at 60°C for 36 After vacuum defoaming, the film-making liquid was obtained; it was co-extruded with the core liquid (water) through the spinneret through a metering pump, stayed in the air for 0.5 seconds, and then immersed in a water bath with a pH of 2 at 10°C to solidify and form a film , winding, and cleaning to obtain a polysulfone hollow fiber membrane with a large flux and symmetrical structure;

[0035] The water contact angle of the polysulfone hollow fiber membrane with large flux symmetrical structure prepared in Example 1 is 67°...

Embodiment 2

[0037] Add 15 grams of polyethersulfone and 85 grams of N,N'-dimethylformamide into the reaction kettle, blow nitrogen, and keep stirring at 20°C until fully dissolved; add 9 grams of methacrylic acid (60% of the mass of polysulfone) , 0.09 gram of vinyltrimethoxysilane (1% of acrylic acid quality), 0.18 gram of azobisisoheptanonitrile (2% of acrylic acid quality), 0.045 gram of dehydrated alcohol (0.5% of acrylic acid quality), 130 Reaction at ℃ for 4 hours, vacuum defoaming to obtain film-making liquid; co-extrude it and core liquid (mixed solution of water and N-methylpyrrolidone, wherein the mass content of water is 60%) through the spinneret through a metering pump , stay in the air for 5 seconds, then immerse in a water bath at 100°C and pH 10 to solidify to form a membrane, wind up, wash, and obtain a polyethersulfone hollow fiber membrane with a large flux symmetrical structure;

[0038] The water contact angle of the large-flux symmetrical polyethersulfone hollow fibe...

Embodiment 3

[0040]Add 20 grams of polysulfone and 80 grams of N-methylpyrrolidone into the reaction kettle, blow nitrogen, and continue to stir at 80°C until fully dissolved; add 4 grams of dimethylaminoethyl methacrylate (20% of the mass of polysulfone), 2 grams of methacryloyloxypropyl tris (trimethylsiloxane) silane (50% of the quality of dimethylaminoethyl methacrylate), 0.004 grams of dibenzoyl peroxide (dimethacrylate 0.1% of the quality of methylaminoethyl ester), 0.4 grams of hydrochloric acid (10% of the quality of dimethylaminoethyl methacrylate), reacted for 12 hours at 80°C, and obtained the film-making liquid after vacuum defoaming; (a mixed solution of water and N,N'-dimethylacetamide, wherein the mass content of water is 30%) is co-extruded through the spinneret through a metering pump, staying in the air for 60 seconds, and then immersed in 90 ° C, pH 8. Solidify into a film in a water bath, wind up, and wash to obtain a polysulfone hollow fiber membrane with a large flux ...

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Abstract

The invention discloses a hollow fiber membrane of a large-flux symmetrical-structure polymer and a preparation method of the hollow fiber membrane. The preparation method includes: adding the polymer and solvent into a reaction kettle, feeding nitrogen and heating and continuously stirring to complete dissolution; adding functional monomers, a cross-linking agent and initiator, heating to trigger polymerization of the functional monomers and performing vacuum defoamation to obtain a membrane casting solution; co-extruding the membrane casting solution and core liquid out through a metering pump via jet ports prior to keeping in the air for certain time, soaking in nonsolvent bath for curing and membrane-forming, rolling up and cleaning to obtain the large-flux symmetrical-structure polymer. The functional polymers are polymerized and cross-linked among network chains of the polymer solution, thereby being self-assembled into rodlike or globular micelle in situ and evenly accumulated during the nonsolvent induced phase separation process to form the symmetrical-strucutre polymer membrane materials. The hollow fiber membrane is high in porosity, large in flux, narrow in pore diameter distribution, high in separation precision, high in production efficiency and broad in industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a polymer hollow fiber membrane with large flux symmetrical structure and a preparation method thereof. Background technique [0002] As an efficient separation technology since the 20th century, membrane separation has been widely used in water treatment, biology, medicine, food, environmental protection and other industrial fields, and has produced huge economic and social benefits. Due to the advantages of wide source of raw materials, easy processing, low cost, and good flexibility, polymers have gradually developed into mainstream membrane materials. Polysulfone, polyethersulfone, polyacrylonitrile, and polyvinylidene fluoride are typical representatives. [0003] Non-solvent-induced phase separation is one of the most commonly used methods for preparing polymer membranes. The polymer membrane prepared by the non-solvent-induced phase separation meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D67/00B01D71/68B01D71/42B01D71/34
CPCB01D67/0006B01D69/08B01D71/34B01D71/42B01D71/68B01D2323/30
Inventor 朱丽静薛立新宋海明王家荣
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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