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Hydrophilic modification method of ultrafiltration membrane

A hydrophilic modification and ultrafiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of difficult selection of grafted monomers, difficulty in maintaining hydrophilicity, and harsh reaction conditions and other problems, to achieve excellent separation performance, convenient operation, and stable hydrophilicity

Inactive Publication Date: 2011-02-09
大连先路科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitation of the surface grafting method is that the grafted monomer is not easy to choose, the reaction conditions are harsh and the cost is high
[0006] 3) Other methods: such as D.L.CHO etc. (J.Appl.Polym.Sci., 47 (1993) 2185) adopt plasma polymerization to prepare acrylic composite film, L.E.S.Brink et al (J.Membrane Sci., 76 (1993) 281 ) methods such as the composite membrane prepared by the surface adsorption method have many limitations such as the difficulty in lasting the hydrophilic property.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the PVA hydrophilic modification ultrafiltration membrane (PES bottom membrane) that preparation deposition amount m is 0.4

[0026] Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, the membrane area is 25cm 2 Concentration is that the PVA aqueous solution 50ml of 0.2 μ g / ml and the glutaraldehyde 25ml of 1.5% are mixed homogeneously and transported in the filter pool (concentration of solidifying agent in the mixed solution is 0.5%), under 0.1MPa air pressure, PVA is deposited on On the PES base film; curing at 20°C for 30 minutes;

[0027] The pure water flux of the modified ultrafiltration membrane is 187.2L / hr.m 2 (25°C, 0.1MPa); the contact angle of the membrane surface is 22 degrees; the stable flux of 3000ppm oil-water emulsion filtration test is 110L / hr.m 2 , After repeated oil-water emulsion filtration tests and cleaning, the pure water flux can still recover to more than 90% of the initial pure water flux.

Embodiment 2

[0028] Embodiment 2: the PVA hydrophilic modification ultrafiltration membrane (PES bottom membrane) that preparation deposition amount m is 2

[0029] (1) Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, and the membrane area is 25cm 2 50ml of PVA aqueous solution with a concentration of 1μg / ml and 25ml of 3% glutaraldehyde are mixed evenly and transported to the filter tank (the concentration of the curing agent in the mixed solution is 1%), and deposited on the PES ultrafiltration filter under 0.1MPa pressure. On the base film; curing at 40°C for 20 minutes;

[0030] The pure water flux of the modified ultrafiltration membrane is 156.8L / hr.m 2 (25°C, 0.1MPa); the contact angle of the membrane surface is 18 degrees; the stable flux of 3000ppm oil-water emulsion filtration test is 100L / hr.m 2 , After repeated oil-water emulsion filtration tests and cleaning, the pure water flux can still recover to more than 95% of the initial pure water flux. ...

Embodiment 3

[0031] Embodiment 3: the PVA hydrophilic modification ultrafiltration membrane (PES bottom membrane) that preparation deposition amount m is 8

[0032] (1) Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, and the membrane area is 25cm 2 Be that the PVA aqueous solution 50ml of 4 μ g / ml and the glutaraldehyde 25ml of 6% are mixed uniformly and transported in the filter pool (concentration of curing agent in the mixed solution is 2%), transported in the filter pool after mixing uniformly, Deposited on the PES ultrafiltration bottom membrane under 0.1MPa pressure; cured at 40°C for 10 minutes;

[0033] The pure water flux of the modified ultrafiltration membrane is 149.8L / hr.m 2 (25°C, 0.1MPa); the contact angle of the membrane surface is 18 degrees; the stable permeation of 3000ppm oil-water emulsion filtration test is 95L / hr.m 2 , After repeated oil-water emulsion filtration tests and cleaning, the pure water flux can still recover to more than 9...

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Abstract

The invention provides a hydrophilic modification method of an ultrafiltration membrane, which can carry out hydrophilic modification on an ultrafiltration multiaperture separation membrane. According to the method, the method of air pressure deposition is employed to deposit hydrophilic macromolecule poval or polyvinylpyrrolidone on the surface of an ultrafiltration multiaperture basement membrane and at the inner walls of membrane pores in a uniform quantitation mode; after the immobilized treatment carried out, a polymer hydrophilic layer deposited on the surface of the basement membrane can greatly improve the hydrophily of the basement membrane; and meanwhile, the polymer macromolecules deposited on the inner surface of the membrane pores can mend defects of macropores of the basement membrane while strengthening the bonding strength of the basement membrane and the polymer hydrophilic layer. The modified hydrophilic ultrafiltration membrane of the invention can be applied to various separation processes.

Description

technical field [0001] The invention relates to a method for modifying ultrafiltration membranes, in particular to a method for modifying commercial ultrafiltration membranes by using hydrophilic polymers. Background technique [0002] After half a century of development, ultrafiltration membranes have been very mature in terms of membrane materials, membrane manufacturing processes, and membrane element structures. Ultrafiltration membrane technology has also been widely used in various fields, but the problem of membrane fouling It is still relatively prominent. Many experts and scholars have done a lot of research work on solving the problem of membrane fouling. It is generally recognized that increasing the hydrophilicity of the membrane surface is a very effective method to improve the membrane fouling resistance, including the use of hydrophilic The materials with good properties can be used to form membranes directly or to modify the surface of existing commercial ult...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D71/68
Inventor 吴大宇刘刚
Owner 大连先路科技发展有限公司
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