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Graft-modified macromolecular filter membrane for water treatment and method for preparing same

A polymer filter membrane and polymer membrane technology are applied in the field of graft-modified polymer filter membrane for water treatment and its preparation, which can solve the problem of blocking surface pores, changing the surface morphology of the membrane, and decreasing the water flux of the membrane. problem, to achieve the effect of high water flux, improved membrane performance, and high rejection rate

Inactive Publication Date: 2010-02-03
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to provide a method for the defects that the existing surface graft modified polymer membranes for water treatment have the defects of changing the surface morphology of the membrane, blocking the surface pores, and causing the water flux of the membrane to decrease. Graft modified polymer membrane for water treatment, this type of membrane not only has the characteristics of high water flux and high rejection rate, but also has permanent pollution resistance

Method used

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  • Graft-modified macromolecular filter membrane for water treatment and method for preparing same

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Embodiment 1

[0020] Embodiment 1 permanent anti-pollution flat sheet microfiltration membrane (membrane 1)

[0021] The polyethersulfone PES powder is irradiated to 20kGy with gamma rays generated by a cobalt source under the protection of nitrogen, and then the irradiated PES powder is placed in an aqueous solution containing 30% acrylic acid AAc and 30% acrylamide AAm , under the protection of nitrogen, the temperature was raised to 60 ° C for 2 hours, and the modified polyethersulfone (PES-g-PAAc) powder with a grafting rate of 25% of polyacrylic acid grafted and the polyacrylic acid grafted with a grafting rate of 25% were respectively obtained. Modified polyethersulfone (PES-g-PAAm) powder grafted with acrylamide. Weigh two kinds of modified polyethersulfone powders according to the molar ratio of AAc and AAm structural units as 1 to 1, dissolve them in N-methylpyrrolidone (NMP) together, and prepare the modified polymer with a weight ratio of 25%. Casting solution, followed by addin...

Embodiment 2

[0028] Embodiment 2 permanent anti-pollution flat sheet microfiltration membrane (membrane 3)

[0029] The polysulfone PSf powder was irradiated to 20kGy by using gamma rays generated by a cobalt source under the protection of nitrogen, and then the irradiated PSf powder was respectively placed in 1% maleic anhydride MAH and 1% 2-vinylpyridine In the aqueous solution of 2-VP, under the protection of nitrogen, the temperature was raised to 60 ° C for 1 hour to react, and the modified polysulfone (PSf-g-PMAH) powder and grafted polymaleic anhydride grafted with a graft rate of 1% were respectively obtained. Modified polysulfone (PSf-g-P2VP) powder grafted with poly-2-vinylpyridine with a branch rate of 1%. Weigh two kinds of modified polysulfone powders according to the molar ratio of MAH to 2-VP structural unit of 1:2, dissolve them together in N-methylpyrrolidone (NMP), and prepare the modified high polymer with a weight ratio of 5%. The casting solution was then added with 0...

Embodiment 3

[0036] Embodiment 3 permanent anti-pollution tubular microfiltration membrane (membrane 5)

[0037] The polyethersulfone PES powder is irradiated to 20kGy with gamma rays generated by a cobalt source under the protection of nitrogen, and then the irradiated PES powder is respectively placed in an aqueous solution containing 50% acrylic acid AAc and 50% acrylamide AAm , under the protection of nitrogen, the temperature was raised to 60 ° C for 5 hours, and the modified polyethersulfone (PES-g-PAAc) powder with a grafting rate of 50% of polyacrylic acid grafted and the polyacrylic acid grafted with a grafting rate of 50% were respectively obtained. Modified polyethersulfone (PES-g-PAAm) powder grafted with acrylamide. Weigh two kinds of modified polyethersulfone powders according to the molar ratio of AAc and AAm structural units as 1:1, dissolve them together in N,N-dimethylacetamide, and prepare the modified polymer with a weight ratio of 40%. The casting solution, followed b...

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Abstract

The invention discloses a graft-modified macromolecular filter membrane for water treatment and a method for preparing the same. The filter membrane takes a macromolecular membrane material as a grafting substrate, wherein the chemical structure of a macromolecular filter membrane interface comprises an electroneutral acid-base matching network. The preparation method comprises the following steps: 1) preparing a modified macromolecular membrane material of a branched chain containing negatively charged acidic groups by a pre-irradiation grafting method; 2) preparing a modified macromolecularmembrane material of a branched chain containing positively charged alkaline groups by the pre-irradiation grafting method; 3) and dissolving the modified macromolecular membrane material of the step1) and the modified macromolecular membrane material of the step 2) in solvent in the molar ratio of the contained acid-base groups of 1 to 1, and adding a pore-forming agent so as to prepare electroneutral membrane casting solution. The invention provides a method for improving the performance of the filter membrane fully, and prepares a permanently pollution resistant filter membrane. The filtermembrane has the characteristics of high water flux and high retention rate, and has significant economic benefit.

Description

technical field [0001] The invention belongs to the field of polymer membranes, in particular to a graft-modified polymer filter membrane for water treatment and a preparation method thereof. Background technique [0002] Polymer materials such as polyethersulfone, polyvinylidene fluoride, and polyacrylonitrile are a class of separation membrane materials with excellent performance. They have excellent physical and chemical properties. The filter membranes prepared by them not only have good separation performance, but also It has good mechanical properties, acid and alkali resistance and other chemical corrosion, and microbial erosion resistance. It is several commonly used membrane materials. However, due to the low surface energy of this kind of polymer membrane material, it has strong hydrophobicity, and the contact angle is 62-108 degrees. It is easy to be polluted when filtering water containing pollutants, which seriously affects its use efficiency and service life. ...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/78
Inventor 李景烨邓波杨璇璇谢雷东虞鸣李林繁
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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