Double-group hydrophilic modification method for polymer microporous membrane

A microporous membrane and polymer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as unsuitable for industrial production, effect decay with time, unfavorable for industrial production, etc.

Inactive Publication Date: 2015-01-28
华文蔚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this technology to pretreat the microporous membrane, and then carry out graft polymerization modification in the solution, although it can endow the microporous membrane with excellent and durable hydrophilicity, but the graft polymerization reaction takes a long time, which is not conducive to industrial production
[0010] In summary, when the existing single plasma technology is used to modify the surface of membrane materials, there is a problem that the effect decays with time; while the method of using plasma pretreatment and then grafting polymerization modification in solution, Not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Take a required amount of polypropylene hollow fiber microfiltration membrane with a porosity of about 40% and an average pore diameter of 0.07 microns, extract and wash with acetone for 6 hours to remove impurities adsorbed on the membrane surface. The treated membrane was vacuum-dried at room temperature for 3 hours and set aside. Dissolve the required amount of glucose in dimethylformamide to prepare solutions of different concentrations. Weigh the required amount of microfiltration membrane washed with acetone and immerse it in the glucose solution for 30 hours, then take out the membrane, and evaporate the solvent under normal pressure at 30°C to obtain the microfiltration membrane coated with grafted monomer (glycosyl compound). membrane;

[0026] In step 2, place the glucose-coated microfiltration membrane in the chamber of the plasma processor, vacuumize, and adjust the vacuum degree to 60Pa by passing nitrogen gas. Turn on the power supply of the plas...

Embodiment 2

[0030] Step 1, take the desired amount of polyvinylidene fluoride hollow fiber microfiltration membrane, with an inner diameter of 100 microns, an outer diameter of 500 microns, an average pore diameter of 0.8 microns, and a porosity of 50%, and extract and wash with acetone for 6 hours to remove the adsorption on Impurities on the membrane surface. The treated membrane was vacuum-dried at room temperature for 3 hours and set aside. Dissolve the required amount of lactose in dimethylformamide to make solutions with different concentrations. Weigh the required amount of microfiltration membrane washed with acetone and immerse it in the allyl glucose solution for 30 hours, then take out the membrane, evaporate the solvent under normal pressure at 30°C, and obtain the grafted monomer (glycosyl compound ) microfiltration membrane;

[0031] Step 2, placing the lactose-coated microfiltration membrane in the chamber of the plasma processing machine, vacuuming, and adjusting the vac...

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PUM

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Abstract

The invention relates to a double-group hydrophilic modification method for a polymer microporous membrane. The method comprises the following steps: (1) performing extraction on the microporous membrane for 0.5 to 6 hours by using an ethanol or acetone solution so as to obtain a preprocessed a matrix membrane, placing the matrix membrane into a solution with sugar to soak for 30 minutes after drying the matrix membrane, and taking out and air-drying the matrix membrane after a modifier is adsorbed to the surface of the microporous membrane; (2) performing radiation processing on the porous membrane obtained in the step (1), washing the porous membrane for three times with deionized water, then soaking the porous membrane into the deionized water to be left to stand overnight, taking the membrane out of the deionized water and carrying out vacuum drying at a temperature of 50 DEG C to obtain a glycosyl modified porous membrane; (3) soaking the glycosyl modified porous membrane into a solution of an organic monomer for 30 to 60 minutes to enable the modified porous membrane to adsorb the organic monomer and air-drying the glycosyl modified porous membrane; (4) placing the polymer microporous membrane processed in the step (3) between two discharge electrodes for dielectric barrier discharge, carrying out normal-pressure dielectric barrier discharge plasma processing, washing and air-drying to obtain the hydrophilic modified polymer microporous membrane. The polymer microporous membrane is a polyethylene, polypropylene or polyvinylidene fluoride microporous membrane.

Description

technical field [0001] The invention relates to a double-group hydrophilic modification method of a polymer microporous membrane. Background technique [0002] In the membrane separation technology applied in the field of water treatment, polymer microporous membranes are widely used as separation membrane materials. The currently used polymer microporous membranes are mainly microporous membranes made of polyethylene (PE), polypropylene (PP) and polyvinylidene fluoride (PVDF). However, their surface has poor hydrophilicity and is easy to be charged with static electricity. These shortcomings restrict their further popularization and application. It is a simple way to expand the use of polyolefin separation membranes by grafting and modifying its surface, using the function of introducing groups to improve the surface performance of the membrane, and at the same time combining the advantages of the two to add new properties. and effective method. These polymer materials h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D69/02B01D67/00
Inventor 华文蔚
Owner 华文蔚
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