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A method for preparing hydrophilic charged composite ultrafiltration membrane

An ultrafiltration membrane, hydrophilic technology, applied in the field of preparing hydrophilic charged composite ultrafiltration membrane, can solve the problems of high transmembrane pressure, poor permeability, poor hydrophilicity, etc., and achieve enhanced charging properties and performance. Long-lasting, stable and low-cost effects

Active Publication Date: 2017-06-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the defects existing in the prior art, the object of the present invention is to provide a method for preparing a hydrophilic charged composite ultrafiltration membrane, which solves the problems of existing electric neutrality or showing weak positive charge (positively charged) properties. Ultrafiltration membrane has the disadvantages of poor hydrophilicity, high transmembrane pressure, poor permeability, and susceptibility to negatively charged organic matter and microbial contamination

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0050] The method for preparing the hydrophilic charged composite ultrafiltration membrane of the present invention adds acrylamide (AM), acrylic acid (AA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to the film-forming liquid. ) three kinds of monomers, and then generate a high molecular copolymer additive by initiating free radical polymerization. Hydrophilic modification and enhanced electronegative performance. The composite ultrafiltration membrane prepared by the non-solvent-induced phase separation method using the film-forming solution containing the high-molecular copolymer additive, the high-molecular copolymer additive molecule with strong hydrophilicity and negatively charged properties is embedded in the membrane, which can effectively Improve the hydrophilicity, membrane flux and anti-fouling ability of the ultrafiltration membrane, and the performance is durable and stable. The method avoids the technical problem that the polymer copolymer additive is ...

Embodiment 1

[0084] (1) Dissolve AM, AA and AMPS monomers with a total weight of 0.1 g in 100 g of DMF solvent at a ratio of 1:1:1, and stir at a high speed at 95°C to fully dissolve. Then add 22 grams of PES special film-making material, stir at 90°C for 12 hours until it is completely dissolved, and prepare a film-forming solution with a mass ratio of monomer, film-making material and solvent of 0.1:22:100.

[0085] (2) Add 0.01 g of initiator azobisisobutyronitrile (ABIN) to the film-forming solution, and carry out free radical polymerization at 5° C. for 12 hours. The film-forming liquid after the reaction was degassed for 12 hours under negative pressure to obtain a film-forming liquid containing AM-AA-AMPS copolymer additive.

[0086] (3) The film-forming solution containing the AM-AA-AMPS copolymer additive prepared by step (2) is passed through a flat-panel film-making equipment using a non-solvent-induced phase inversion method, and water is used as a coagulation bath to prepare a...

Embodiment 2

[0089] (1) Dissolve AM, AA and AMPS monomers with a total weight of 5 grams in 100 grams of DMF solvent at a ratio of 0.1:1:3, and stir at a high speed at 55°C to fully dissolve. Then add 2 grams of PVP and 15 grams of PES special film-making material, stir at 75°C for 12 hours until they are completely dissolved, and prepare a composition with a mass ratio of monomer, other additives, film-making material and solvent of 5:2:15:100. Membrane fluid.

[0090] (2) Add 0.05 g of initiator dicumyl peroxide to the film-forming solution, and carry out free radical polymerization at 5° C. for 12 hours. The film-forming liquid after the reaction was degassed for 12 hours under negative pressure to obtain a film-forming liquid containing AM-AA-AMPS copolymer additive.

[0091] (3) The film-forming solution containing the AM-AA-AMPS copolymer additive prepared by step (2) is passed through a flat-panel film-making equipment using a non-solvent-induced phase inversion method, and water i...

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Abstract

The invention relates to a method for preparing a hydrophilic charged composite ultrafiltration membrane. The method comprises together dissolving acrylamide (AM), acrylic acid (AA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and a high-molecular membrane-preparing materials in a membrane solution, adding an initiator into the membrane-forming solution to initiate free radical polymerization and generate a high-molecular copolymer additive in the membrane-forming solution. The high-molecular copolymer additive is strong in hydrophilia, is negatively charged, and is easy to disperse and dissolve in the membrane-forming solution. The membrane-forming solution containing the high-molecular copolymer additive is used to prepare the composite ultrafiltration membrane by employing a non-solvent induction phase separation process, so that the high-molecular copolymer additive is embedded into the membrane structure, and introduced various hydrophilic and charged functions are not easy to lose. According to the method for preparing the hydrophilic charged composite ultrafiltration membrane, the high-molecular copolymer additive molecule, which is strong in hydrophilia and negatively charged, is embedded into the membrane, and helps to effectively improve the hydrophilia, the membrane flux and the antipollution capability of the ultrafiltration membrane, and the ultrafiltration membrane is lasting and stable in performances.

Description

technical field [0001] The invention relates to the technical field of composite ultrafiltration membrane preparation, in particular to a method for preparing a hydrophilic charged composite ultrafiltration membrane. The charge refers in particular to a negative charge. Background technique [0002] Membrane separation is considered to be "one of the most promising and promising major high-tech technologies in the 21st century". Membrane separation uses a selective permeable membrane as the separation medium. Under the action of one or several driving forces such as pressure difference, concentration difference, potential difference, and temperature difference on both sides of the membrane, a certain component in the raw material side selectively Through the membrane, so as to achieve the purpose of separation, purification or concentration. [0003] In membrane separation technology, ultrafiltration membrane is the most widely used one among various separation membranes. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00
Inventor 魏昕杨丽奚振宇
Owner CHINA PETROLEUM & CHEM CORP
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