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Preparation method of dual anti-pollution ultrafiltration membrane

An anti-pollution, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problem that the doping amount of hydrophilic polymers should not be too high, it is difficult to scale production, polysulfone molecular modification sexual difficulties

Active Publication Date: 2021-05-14
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bulk modification is to modify the structure of polysulfone molecules, because it is difficult to modify polysulfone molecules, and it is also difficult to form large-scale production
Blending modification is to dope the hydrophilic polymer in the polysulfone, but the doping amount of the hydrophilic polymer should not be too high, otherwise, the hydrophilic polymer will be lost during the ultrafiltration process, resulting in the stability of the membrane. Therefore, the doping amount of hydrophilic polymer is limited, so that the anti-pollution performance cannot be significantly improved

Method used

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  • Preparation method of dual anti-pollution ultrafiltration membrane
  • Preparation method of dual anti-pollution ultrafiltration membrane
  • Preparation method of dual anti-pollution ultrafiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1: Preparation of chloromethylated polysulfone

[0043] Weigh 14.88 g polysulfone and dissolve in 750 mL CHCl 3 10 g paraformaldehyde, 395 µL SnCl 4 , and then dropwise added 45 mL of trimethylchlorosilane to a 1000 mL three-neck round bottom flask. After the dropwise addition, put the mixed solution on the oil pan for reaction, set the temperature at 65 °C, react for 72 h, and put on the reflux device. After the reaction was completed, the solution was poured into a beaker, then cooled to room temperature, precipitated with methanol, and dried by suction filtration. The dried solid was dissolved in chloroform, ultrasonically dissolved, reprecipitated, washed three times with methanol, placed in a vacuum oven at 50°C for 24 hours to obtain purified chloromethylated polysulfone.

Embodiment 2

[0044] Embodiment 2: preparation polyethylene glycol acrylate

[0045] Put 80 g of dry polyethylene glycol-400 and 30 mL of triethylamine in 300 mL of dry dichloromethane, cool in an ice-water bath, and dissolve in 130 mL of dry dichloromethane drop by drop under nitrogen atmosphere acryloyl chloride (12.2 mL). After mechanical stirring at room temperature for 24 hours, the reaction mixture was cooled at 273 K and the salts were filtered off using a Buchner funnel.

[0046] Wash with 200 mL HCl (2 M) at the end of the reaction, and wash with 200 mL HCl 2 O and NaHCO 3 (1M), and 200 mL of NaCl were dried over magnesium sulfate and the solvent was evaporated in vacuo. The crude product (30 g) was dissolved in 100 mL of distilled water and extracted twice with diethyl ether (2×50 mL), keeping the aqueous phase. Extract the aqueous phase stepwise with a 3:1 mixture of dichloromethane / n-hexane (40 mL×2), add magnesium sulfate to the organic phase to dry, pass through degreased ...

Embodiment 3

[0047] Embodiment 3: prepare polystyrene

[0048] Add 38 mL of styrene, 430 µL of benzyl bromide, and 1.686 g of bipyridine into a 100 mL three-necked flask, directly quench with liquid nitrogen, add liquid nitrogen to the cold hydrazine, open the air in the pumping line, and then At room temperature, turn on the oil pump to evacuate (10-15 min), open the nitrogen valve, and first pass in N 2 , and then thawed with warm water, repeat 2 times. When thawing for the second time, weigh 0.516 g CuBr, put it into a three-necked flask after it is completely thawed, quench it with liquid nitrogen, pump it with an oil pump at room temperature (10-15 min), and first pass N 2 , and then thawed with warm water, repeat 2 times. After the solution was thawed, put the oil pan on the shelf, set the temperature to 110 °C, react for 12 h, and stir with magnetic force. After the reaction was completed, it was diluted with THF and filtered with a Buchner funnel to remove CuBr which was not rea...

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Abstract

The invention discloses a dual anti-pollution ultrafiltration membrane as shown in a structural formula (I). According to the invention, a blending membrane preparation technology is adopted, and the hydrophilic-hydrophobic block polymer is introduced to improve the anti-pollution performance of a membrane substrate; and then a dendritic hydrophilic polymer anti-pollution layer is constructed on the surface of the membrane substrate by adopting an atom transfer radical polymerization technology to achieve a dual anti-pollution effect. The ultrafiltration membrane can reduce the regeneration frequency in the water treatment process to a certain extent, improve the production efficiency and reduce the water treatment cost.

Description

technical field [0001] The invention relates to a preparation method of a double anti-pollution ultrafiltration membrane, which belongs to the technical field of polymer membrane materials. Background technique [0002] Polymer ultrafiltration membranes are widely used in sewage treatment, seawater desalination, food processing, biomedicine, bioengineering, chemical industry and other fields. As a thermoplastic material, polysulfone is widely used as a substrate for ultrafiltration membranes due to its cheap and easy to obtain, good mechanical properties, good chemical stability, and compression and wear resistance. However, the surface of polysulfone membrane has strong hydrophobicity, and it is easy to adsorb protein molecules, resulting in pore blockage and membrane fouling, resulting in reduced reuse efficiency. Therefore, in order to improve the anti-fouling performance of polysulfone membranes, hydrophilic modification of polysulfone membranes is the main method for p...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D71/80B01D61/14
CPCB01D61/145B01D67/0006B01D69/02B01D71/80
Inventor 余文成卫引茂
Owner NORTHWEST UNIV
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