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Hydrophilic bactericidal anti-contamination reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane, anti-pollution technology, applied in the field of water treatment, to achieve the effect of inhibiting growth, convenient operation and improving anti-pollution performance

Active Publication Date: 2018-05-22
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the attacking reverse osmosis membrane has a bactericidal effect, the bacteria after death adhere to the membrane and provide nutrients and attachment points for the growth of new bacteria.

Method used

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  • Hydrophilic bactericidal anti-contamination reverse osmosis membrane and preparation method thereof
  • Hydrophilic bactericidal anti-contamination reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Fix the aromatic polyamide composite reverse osmosis membrane produced by our company (ULP11, the flux is 35.2gfd, the desalination rate is 99.4%, the size is 15×13 cm) between two plexiglass frames and a rectangular hollow silica gel pad In between, the size of the rectangular hollow silica gel pad is the same as that of the plexiglass frame, immersed in 25% isopropanol solution for 30min, rinsed with pure ethanol solvent, and placed in N 2 Tumble dry under cover.

[0029] (2) Prepare 40 mL of acetonitrile solution, add 2-(ethyltrithiocarbonate)-2-methylpropionic acid ACPA (0.246 g, 1.1 mmol), dicyclohexylcarbodiimide DCC (0.454 g, 2.2mmol), the reverse osmosis membrane was placed in the acetonitrile solution and reacted for 24h. The membrane was washed repeatedly with acetonitrile to obtain the polyamide reverse osmosis membrane ACPA-TFC with RAFT chain transfer agent.

[0030](3) At room temperature, add methacryloyl ethyl sulfobetaine SBMA (8.37g, 30mmol) and ...

Embodiment 2

[0036] (1) Soak the reverse osmosis membrane in 25% isopropanol solution for 30 minutes, take it out, rinse it with pure ethanol solvent, and dry it;

[0037] (2) Graft RAFT chain transfer reagent on the reverse osmosis membrane: add 2-(ethyltrithiocarbonate)-2-methylpropionic acid (ACPA) and dicyclohexylcarbodiimide (DCC) to acetonitrile In the solvent, shake well and mix, put the reverse osmosis membrane into the above solution, react for 24h, take it out, rinse the membrane 5 times with pure acetonitrile solvent, and obtain the polyamide membrane (ACPA-TFC) with RAFT chain transfer agent; , wherein the molar ratio of ACPA to DCC is 1:2;

[0038] (3) RAFT reaction of SBMA: at room temperature, add monomer 1 and photoinitiator into acetonitrile solvent, stir until completely dissolved, pass nitrogen gas to remove oxygen for 6 minutes, put the diaphragm into the above acetonitrile solution, and react under LED light 6h; after the reaction, the diaphragm was cleaned with aceto...

Embodiment 3

[0042] (1) Soak the reverse osmosis membrane in 25% isopropanol solution for 24 minutes, take it out, rinse it with pure ethanol solvent, and dry it;

[0043] (2) Graft RAFT chain transfer reagent on the reverse osmosis membrane: add 2-(ethyltrithiocarbonate)-2-methylpropionic acid (ACPA) and dicyclohexylcarbodiimide (DCC) to acetonitrile In the solvent, shake and mix, put the reverse osmosis membrane into the above solution, react for 18h, take it out, rinse the membrane 4 times with pure acetonitrile solvent, and obtain the polyamide membrane (ACPA-TFC) with RAFT chain transfer agent; , wherein the molar ratio of ACPA to DCC is 1:2;

[0044] (3) RAFT reaction of SBMA: At room temperature, add monomer 1 and photoinitiator into acetonitrile solvent, stir until completely dissolved, pass nitrogen gas to remove oxygen for 5 minutes, put the diaphragm into the above acetonitrile solution, and react under LED light 4h; after the reaction, the diaphragm was cleaned with acetonitri...

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Abstract

The invention provides a hydrophilic bactericidal anti-contamination reverse osmosis membrane and a preparation method thereof. A bactericidal high-molecular polymer and an antibacterial polymer are grafted on the surface of a reverse osmosis membrane through a reversible addition-fragmentation chain transfer polymerization (RAFT) living polymerization method, so that the hydrophilic bactericidalanti-contamination reverse osmosis membrane is obtained, the method utilizes free amino groups on the surface of a polyamide functional layer to link a RAFT chain transfer agent in situ through an amide condensation reaction, and functional layers with different thicknesses and different molecular weights are controllably grafted, such as an amphoteric ion functional layer with hydrophilic properties and a quaternary ammonium salt functional layer with bactericidal performance. The anti-contamination reverse osmosis membrane prepared by the method still has excellent anti-contamination characteristics without sacrificing the performance of the original membrane, the long-term anti-contamination ability of the original membrane in a complex operating environment is improved, and the purposes of inhibiting the growth of bacteria and reducing attachment of microorganisms on the membrane are achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a hydrophilic anti-pollution reverse osmosis membrane and a preparation method thereof. Background technique [0002] With the development of modern industry, water pollution is becoming more and more serious, so the derived water treatment technology is more and more important for human health and environmental protection. Reverse osmosis membrane separation technology has separation characteristics such as high efficiency, low energy consumption, and high selectivity, and has been widely used in drinking water purification, waste water recycling, seawater desalination and other fields. Among them, polyamide composite reverse osmosis membrane has the advantages of high rejection rate, large flux, good chemical stability and low operating pressure, so it has become the most widely used separation technology in the global water treatment industry. The biggest ...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D69/02B01D67/00B01D61/02C02F1/44C02F1/50C08J7/18C08L77/00
CPCB01D61/025B01D67/0002B01D69/02B01D71/78B01D2311/2692B01D2325/36B01D2325/48C02F1/441C02F1/50C08J7/18C08J2377/00
Inventor 章冰洁张慧林康燕梁松苗
Owner VONTRON TECH CO LTD
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