Hydrophilic modification method for macromolecular filter membrane and obtained product

A polymer membrane, hydrophilic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Surface unevenness and other problems, to achieve the effects of high moisture retention and pollution resistance, simple operation and post-processing, and short reaction time

Inactive Publication Date: 2011-04-06
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the long reaction time of the existing polymer filter membrane hydrophilic modification method, complex operation and post-treatment, long post-treatment time, and the pollution resistance of the modified polymer filter membrane. The effect is not good, and it is easy to cause defects such as uneven membrane surface and membrane pore clogging. It provides ...

Method used

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  • Hydrophilic modification method for macromolecular filter membrane and obtained product
  • Hydrophilic modification method for macromolecular filter membrane and obtained product
  • Hydrophilic modification method for macromolecular filter membrane and obtained product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 Modified polyethersulfone (PES) filter membrane (filter membrane 1)

[0036] Put the PES (weight-average molecular weight=410,000) filter membrane into deionized water and rinse it 5 times. Soak the PES filter membrane in an aqueous solution containing 80% (w / w) ammonium persulfate and 1.6% (w / w) N, N'-methylenebisacrylamide until saturated adsorption; soak the PES filter membrane The aforementioned aqueous solution was placed under an ultraviolet lamp with a wavelength of 300nm and irradiated for 10 seconds, then taken out and washed with deionized water several times before testing.

[0037] The modified PES filter membrane was subjected to atomic force microscopy ( figure 1 ), contact angle measuring instrument, and constant pressure water flux measuring device analysis, the surface of the PES filter membrane is smooth and hydrophilic. The test results of anti-bovine serum albumin (BSA) pollution performance show that, under 0.2MPa nitrogen pressure, a...

Embodiment 1

[0038] Comparative example 1 blank polyethersulfone (PES) filter membrane (contrast 1)

[0039] The unmodified PES filter membrane was subjected to atomic force microscopy ( figure 2 ), contact angle measuring instrument, constant pressure water flux measuring device analysis, PES membrane surface hydrophilicity is poor. The results of the anti-BSA pollution performance test show that the PES filter membrane has a very low washable recovery water flux percentage, indicating that the PES filter membrane has poor anti-pollution ability to BSA. The performance test results of the obtained PES filter membrane are shown in Table 1.

Embodiment 2

[0040] Embodiment 2 Modified polyvinylidene fluoride (PVDF) filter membrane (filter membrane 2)

[0041] The polyvinylidene fluoride (PVDF) (weight average molecular weight = 680,000) filter membrane was rinsed in deionized water for 5 times. The polyvinylidene fluoride (PVDF) filter membrane is soaked in the aqueous solution containing 15% (w / w) potassium bisulfate compound salt and 0.2% (w / w) cross-linking agent DE until saturated adsorption; The aforementioned aqueous solution with a polyvinylidene fluoride (PVDF) filter membrane was placed under a 254nm wavelength ultraviolet lamp and irradiated for 20 minutes, then taken out and washed with deionized water several times before testing.

[0042] The prepared polyvinylidene fluoride (PVDF) membrane was examined by atomic force microscopy ( image 3 ), contact angle measuring instrument, and constant pressure water flux measuring device analysis, the filter membrane has a smooth surface and good hydrophilicity. The test re...

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Abstract

The invention discloses a hydrophilic modification method for a macromolecular filter membrane, which is characterized by comprising the following steps of: immersing the macromolecular filter membrane in aqueous solution containing a water-soluble cross-linking agent and persulfate, irradiating by using ultraviolet light, and taking out to obtain the modified macromolecular filter membrane, wherein the macromolecular filter membrane has a C-H bond. By the method of the invention, the defects that: the conventional hydrophilic modification method for the macromolecular filter membrane has long reaction time, complex operation and aftertreatment steps and long aftertreatment time, the modified macromolecular filter membrane has the poor pollution-resistant effect, the surface of the filtermembrane is uneven and the membrane pore is easy to block and the like are overcome, and the hydrophilic modification method which has the advantages of capacity of shortening the reaction time obviously, simpleness in aftertreatment and operation, short aftertreatment time and low cost, and is suitable for industrial application is provided. The invention also discloses the modified macromolecular filter membrane prepared by the method. The modified macromolecular filter membrane has the excellent surface regularity, hydrophily, moisture retention and pollution resistance, and membrane poresare not blocked, so the macromolecular filter membrane has the perpetual hydrophily.

Description

technical field [0001] The invention relates to a method for modifying the hydrophilicity of a polymer filter membrane, and also relates to a hydrophilically modified polymer filter membrane. Background technique [0002] Polysulfone, polyethersulfone, polyvinylidene fluoride, polyacrylonitrile and other polymer materials are a class of separation membrane materials with excellent performance, which have excellent physical and chemical properties. The filter membranes prepared by them not only have good separation Performance, and has good mechanical properties, acid and alkali resistance and chemical corrosion resistance, microbial erosion resistance, is several commonly used membrane materials. However, due to the low surface energy and strong hydrophobicity of such polymer membrane materials, the contact angle is usually 62-108 degrees. Therefore, it is easy to be polluted when filtering waste water containing pollutants, resulting in a sharp drop in water flux, which se...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D67/00
Inventor 李景烨邓波于洋李林繁虞鸣杨璇璇张伯武
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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