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 polymeriz

Method used

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  • Hydrophilic modification method of ultrafiltration membrane
  • Hydrophilic modification method of ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1: Preparation of PVA hydrophilic modified ultrafiltration membrane (PES base membrane) with a deposition amount m of 0.4

[0026] Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, with a membrane area of ​​25cm 2 , Mix 50ml of PVA aqueous solution with a concentration of 0.2μg / ml and 25ml of 1.5% glutaraldehyde and transport them to the filter tank (the concentration of curing agent in the mixed solution is 0.5%), and deposit PVA on the pressure of 0.1MPa On PES base film; curing at 20℃ for 30min;

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

Example Embodiment

[0028] Example 2: Preparation of PVA hydrophilic modified ultrafiltration membrane (PES base membrane) with a deposition amount m of 2

[0029] (1) Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, with a membrane area of ​​25cm 2 , Mix 50ml of PVA aqueous solution with a concentration of 1μg / ml and 25ml of 3% glutaraldehyde and transport it to the filter tank (the concentration of curing agent in the mixed solution is 1%), and deposit on PES ultrafiltration under 0.1MPa pressure On the bottom film; curing at 40℃ for 20min;

[0030] The pure water flux of the modified ultrafiltration membrane is 156.8L / hr.m 2 (25℃, 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 several oil-water emulsion filtration tests and cleaning, the pure water flux can still be restored to more than 95% of the original pure water flux.

Example Embodiment

[0031] Example 3: Preparation of PVA hydrophilic modified ultrafiltration membrane (PES base membrane) with a deposition amount m of 8

[0032] (1) Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, with a membrane area of ​​25cm 2 , Mix 50ml of PVA aqueous solution with a concentration of 4μg / ml and 25ml of 6% glutaraldehyde and transport them to the filter tank (the concentration of curing agent in the mixture is 2%), and then transport them to the filter tank after mixing. Deposited on the bottom PES ultrafiltration membrane under 0.1MPa air pressure; cured for 10min at 40℃;

[0033] The pure water flux of the modified ultrafiltration membrane is 149.8L / hr.m 2 (25℃, 0.1MPa); the contact angle of the membrane surface is 18 degrees; the stable permeability of 3000ppm oil-water emulsion filtration test is 95L / hr.m 2 After several oil-water emulsion filtration tests and cleaning, the pure water flux can still be restored to more than 95% of the original pu...

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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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