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Method for modifying polyvinylidene fluoride ultrafiltration membrane by amphiphilic co-polymer

An amphiphilic copolymer, polyvinylidene fluoride membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Control stability, repeatability, hydrophilicity and anti-pollution effect

Inactive Publication Date: 2008-09-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the contradiction that the water flux and rejection rate of the current PVC ultrafiltration membrane cannot be improved at the same time

Method used

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  • Method for modifying polyvinylidene fluoride ultrafiltration membrane by amphiphilic co-polymer
  • Method for modifying polyvinylidene fluoride ultrafiltration membrane by amphiphilic co-polymer
  • Method for modifying polyvinylidene fluoride ultrafiltration membrane by amphiphilic co-polymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 preparation steps are as follows:

[0050] 1) Blend polyvinylidene fluoride, poly(methyl methacrylate-r-monomethyl ether polyoxyethylene methyl methacrylate), additives, non-solvent and solvent, stir at 70°C for 36 hours, filter, Vacuum degassing to obtain the casting solution, the components and concentrations of the casting solution are as follows:

[0051] The molecular weight of polyvinylidene fluoride is 2.1×10 5 , the concentration is 10wt%;

[0052] The molecular weight of poly(methyl methacrylate-r-monomethyl ether polyoxyethylene methyl methacrylate) is 2.8×10 4 , the concentration is 2wt%;

[0053] The additives are: polyvinylpyrrolidone with a molecular weight of 30,000 and a concentration of 0.5 wt%; polyethylene glycol with a molecular weight of 6×10 2 , the concentration is 5wt%;

[0054] The solvent is: N,N-dimethylacetamide, the concentration is 81.7wt%;

[0055] The non-solvent is: H 2 O, concentration is 0.8wt%; Each component distr...

Embodiment 2

[0062] Embodiment 2 preparation steps are the same as embodiment 1.

[0063]

Embodiment 3

[0064] Embodiment 3 preparation steps are the same as embodiment 1.

[0065]

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Abstract

The invention discloses a method of producing the hyperfiltration membrane of amphiphilic copolymer modified polyvinylidene fluoride, comprising the following steps: 1) mixing polyvinylidene fluoride, poly (methyl methacrylate - monomethyl ether polyoxyethylene methyl methacrylate), additives, non-solvent and solvent to form the casting film solution; 2) making the casting film solution into the polyvinylidene fluoride membrane by using the film forming machine and then soaking in the coagulation bath; 3) conducting the posttreatment of hydrophilicity; 4)obtaining the hydrophilic polyvinylidene fluoride ultrafiltration membrane after cleaning and drying. The method is characterized in that the brush shape, chain ball shape or dumbbell shape amphiphilic copolymer are mixed with the polyvinylidene fluoride to produce the polyvinylidene fluoride hyperfiltration membrane with hydrophilicity, anti-pollution, large flux and high retention rate by adopting the solution phase conversion method. The method has the advantages that the obtained membrane is provided with dozens to hundreds nanometer of particular densified hydrogel surface layers, the contact angle of the membrane surface can be reduced below 60 degrees and can be lowered to 0 degree within tens of seconds, the water flux can reach 1000L / m<2> / h (0.1Mpa) or above, the retention rate of BSA can reach 90% or more and the recovery rate of water cleaning flux can reach 90% or higher.

Description

technical field [0001] The invention belongs to the technical field of preparation and modification of polyvinylidene fluoride (PVDF) separation membranes, and in particular relates to a method for modifying polyvinylidene fluoride ultrafiltration membranes by amphiphilic copolymers. Background technique [0002] PVDF membrane is widely used in the field of membrane separation, but the biggest problem in the process of use is the membrane fouling caused by its hydrophobicity, which causes a decrease in flux and a decrease in separation performance, thereby increasing the cost of cleaning or replacing the membrane, and reducing the service life of the membrane. . The purpose of the present invention is to modify the membrane material to solve the problems that the current PVDF membrane has poor hydrophilicity, is easy to pollute, and the flux and rejection rate cannot be improved at the same time. [0003] There are three main types of hydrophilization modification methods c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34
Inventor 徐又一刘富朱宝库朱利平章帆
Owner ZHEJIANG UNIV
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