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Method for modifying surface of ultrafiltration membrane

A surface modification, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve problems such as increasing operation difficulty and production cost, membrane fouling, affecting membrane separation performance and service life, etc. Improved hydrophilicity and chargeability, easy and safe operation, and improved contamination resistance

Inactive Publication Date: 2011-04-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ultrafiltration membrane made of polysulfone often suffers from severe membrane fouling when separating protein and polypeptide solutions. The main reason is that the hydrophobic nature of polysulfone will lead to a large amount of protein molecules with non-polar side chains adsorbed on the membrane surface. ; Membrane fouling affects the separation performance and service life of the membrane, and also increases the difficulty of operation and production costs, which is the main obstacle to the wide application of membrane technology

Method used

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  • Method for modifying surface of ultrafiltration membrane
  • Method for modifying surface of ultrafiltration membrane
  • Method for modifying surface of ultrafiltration membrane

Examples

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Effect test

Embodiment 1

[0033] Add 15g of polysulfone and 6g of polyethylene glycol 600 to 79g of DMAc, at 80°C, mechanically stir for 12 hours to make a casting solution, filter, scrape the film on a clean glass plate after defoaming, and gel in deionized water Produce ultrafiltration membranes.

[0034] Soak the polysulfone flat ultrafiltration membrane in 0.04mol / L benzophenone ethanol solution for 30min, take out the ultrafiltration membrane and soak it in 40g / L SPP aqueous solution, irradiate with 312nm ultraviolet light for 30min in a nitrogen atmosphere, take out the ultrafiltration membrane The contamination resistance test was carried out after the filter membrane was cleaned.

[0035] The flow recovery rate of the modified membrane is 90.5%, and the rejection rate of BSA is above 97%.

Embodiment 2

[0037]Add 15g of polysulfone and 6g of polyethylene glycol 600 into 79g of DMAc, at 80°C, mechanically stir for 12 hours to make a casting solution, filter, and perform dry-wet spinning after defoaming, and gel in deionized water. ultrafiltration membrane.

[0038] Soak the polysulfone hollow fiber ultrafiltration membrane in 0.04mol / L benzophenone ethanol solution for 30min, take out the ultrafiltration membrane and soak it in 40g / L DMMSA aqueous solution, and irradiate it with 312nm ultraviolet light for 30min under nitrogen atmosphere, then The hydrophilic monomer solution was replaced and the hollow fiber membrane was turned over, and then irradiated with ultraviolet light for 30 minutes under nitrogen atmosphere again. After the ultrafiltration membrane was taken out and cleaned, the pollution resistance test was carried out.

[0039] The flow recovery rate of the modified membrane is 89.5%, and the rejection rate of BSA is above 96%.

Embodiment 3

[0041] Add 15g of polysulfone and 6g of polyethylene glycol 1000 to 79g of DMAc, at 80°C, mechanically stir for 12 hours to make a casting solution, filter, scrape the film on a clean glass plate after defoaming, and gel in deionized water Produce ultrafiltration membranes.

[0042] Soak the polysulfone flat ultrafiltration membrane in 0.2mol / L benzophenone ethanol solution for 30min, take out the ultrafiltration membrane and soak it in 10g / L PEGA aqueous solution, irradiate with 312nm ultraviolet light for 40min under nitrogen atmosphere, take out the ultrafiltration membrane The contamination resistance test was carried out after the filter membrane was cleaned.

[0043] The flow recovery rate of the modified membrane is 85.5%, and the rejection rate of BSA is above 97%.

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Abstract

The invention relates to a novel method for modifying the surface of a polysulfone ultrafiltration membrane, used for improving the pollution resistance of a separation membrane. In the invention, by using polysulfone as a surface modification basement membrane, a living radical is generated on the membrane surface with an ultraviolet initiator or a thermal initiator to further graft a hydrophilic monomer on the surface of the membrane, thereby finishing grafting modification to a polysulfone ultrafiltration membrane. The method is convenient to operate, efficiently inhibits generation of polysulfone main chain fracture and also keeps the interception performance of the ultrafiltration membrane. In the prepared ultrafiltration membrane, the hydrophilicity is obviously improved, and the pollution resistance is remarkably enhanced.

Description

technical field [0001] The invention relates to an ultraviolet graft polymerization anti-pollution ultrafiltration membrane, in particular to a method for modifying the surface of the ultrafiltration membrane. Background technique [0002] The ultrafiltration process has the following characteristics: (1) There is no interphase change, and it can be separated at room temperature and low pressure, so its energy consumption is low; (2) The ultrafiltration separation process is generally a simple pressurized delivery fluid, and the process flow Simple, easy to operate and manage; (3) The equipment is small in size, simple in structure, and low in investment costs; (4) There is no qualitative change in the substance during the concentration and separation process, so it is suitable for the treatment of flavor-preserving and heat-sensitive substances; (5) Suitable for Recovery of trace precious macromolecular substances in dilute solution and concentration of low concentration ma...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/68B01D61/14
Inventor 曹义鸣于海军康国栋刘健辉李萌袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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