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Preparation method for pollution-resistant polymer membrane

A polymer membrane and anti-pollution technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex membrane forming process, difficult control of membrane pore size, high membrane preparation cost, etc.

Active Publication Date: 2014-10-01
威海佳美化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the above method is that the introduced betaine polymer and the membrane substrate are prone to phase separation, which makes it difficult to control the pore size of the membrane, which makes the membrane formation process complicated and the membrane preparation cost is high.

Method used

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  • Preparation method for pollution-resistant polymer membrane
  • Preparation method for pollution-resistant polymer membrane
  • Preparation method for pollution-resistant polymer membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Pour 18 grams of phenolphthalein type polyaryletherketone (PEK-C) into a round bottom flask, then add 8 grams of polyethylene glycol (PEG-600) additive and 74 grams of N-methylpyrrolidone (NMP) solvent, at 50 Stir and dissolve rapidly at ℃ for 8 hours to obtain a uniform polymer solution; degas the polymer solution obtained above for 24 hours in vacuum at room temperature; slowly pour the obtained polymer solution on a clean glass plate, and adjust the scraping speed to 1.87 m / min, scrape out a film with a thickness of 150 microns (the thickness of the liquid layer), wait for 5 seconds in the air, then quickly put it into the deionized water coagulation bath, take it out after the film falls off automatically, and soak it in deionized water after cleaning Standby after 24 hours;

[0039]Add a layer of 2% (w / w) methanol solution of glycidyl methacrylate to the surface of the polyether ether ketone ultrafiltration membrane prepared by the phase inversion method. The surf...

Embodiment 2

[0043] Add a layer of 20% methanol solution of glycidyl methacrylate to the surface of the polyether ether ketone ketone film obtained in Example 1. After the surface of the film is infiltrated, place it in a 14 mW / cm2, wavelength of 380 nm Irradiate under ultraviolet light for 1.5 minutes to polymerize and graft glycidyl methacrylate on the surface of the membrane, and the modified membrane obtained is washed repeatedly with a mixture of methanol and water (2:1, v / v);

[0044] The modified membrane obtained in the previous step was immersed in a 35% concentrated hydrochloric acid solution to react for 2 hours. After the reaction, it was repeatedly washed with deionized water and methanol to obtain a membrane surface grafted with chloroalkane;

[0045] Add 10 milliliters of methanol and deionized water in a volume ratio of 1:1 mixed solution and a clean magnetic stirring rotor into a 50 milliliter polymerization tube, add 50 millimoles of phosphobetaine acrylate, and stir until...

Embodiment 3

[0047] Add a layer of 15% (w / w) methanol solution of glycidyl methacrylate to the surface of the polyether ketone ketone film obtained by the method of Example 1. After the film surface is soaked, place it at 15 mW / cm2 and Irradiate for 3 minutes under a 380-nanometer ultraviolet lamp to polymerize glycidyl methacrylate and graft it on the surface of the membrane. The modified membrane obtained is washed repeatedly with a mixture of methanol and water (2:1, v / v);

[0048] The modified membrane obtained in the previous step was immersed in a 48% (w / w) concentrated hydrobromic acid solution for 8 hours. After the reaction, it was washed repeatedly with deionized water and methanol to obtain a membrane grafted with bromoalkane surface;

[0049] Add 10 ml of methanol and deionized water in a volume ratio of 1:1 and a clean magnetic stirring rotor into a 50 ml polymerization tube, then add 1.5 mmol of copper bromide powder, 3 mmol of 2,2-bipyr and 100 mmol of acrylate sulfobetaine...

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Abstract

The invention discloses a pollution-resistant modified method for a polymer membrane containing arone perssad. The method comprises the following steps: poly(methyl)acrylic acid epoxy alkyl ester is grafted on the surface of an ultra-(micro-)filtration or nanofiltration membrane through ultraviolet graft polymerization; further reaction is conducted to generate alkyl halide; the alkyl halide is conducted by reaction with acrylic acid betaine compounds under the condition that certain catalyst, ligands or reducing agent are subsistent; the ultra-(micro-)filtration or nanofiltration membrane with favorable hydrophilcity and pollution-resistant performance is obtained. Purified water flux of the prepared ultra-(micro-)filtration or nanofiltration membrane can reach to 50-280 L / m<2>.h; the reject rate of the pollution-resistant ultra-(micro-)filtration or nanofiltration membrane to bovine serum albumin is 95-100%; the recovery rate of water flux reaches to 97-100%. The pollution-resistant modified method is characterized in that a small quantity of initiating agent functional groups are introduced quickly on the surface of the membrane through the light graft method; then graft polymerization is conducted in water phase adopting an atom free radical transferring polymerization method; the pollution-resistant modified method has the advantages that the polymerization system can be repeatedly used, and is easy in continuous production; the polymer is grafted with the zwitter ionic pair perssad with a betaine structure, so that the surface of the membrane is high in hydrophilia; the pollution-resistant capability is improved remarkably.

Description

technical field [0001] The invention discloses a method for preparing an aromatic ketone group-containing ultra (micro) filtration or nanofiltration polymer membrane with anti-pollution performance, and belongs to the technical field of high-performance membrane material preparation. Background technique [0002] The initial stage of membrane fouling is mainly manifested in the adsorption of protein on the membrane surface. Once protein adsorption occurs, it will cause the adsorption of other pollutants, or lead to the adhesion, reproduction and growth of some microorganisms. Therefore, preparing a membrane surface that inhibits protein adsorption has always been a difficulty in improving the performance of membrane materials. Today, the most effective and direct membrane fouling control technology is the hydrophilic modification of membrane materials. Membrane materials containing aromatic ketone groups, such as polyaryletherketone (PEK-C), have poor hydrophilicity, and th...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D67/00B01D69/02
Inventor 高昌录乔伟孙秀花
Owner 威海佳美化工有限公司
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