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Surface modification method of polymer microporous film

A surface modification and microporous membrane technology, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems affecting the modification efficiency, limited adsorption of hydrophilic polymers, etc., and achieve good safety , stable hydrophilic layer and low energy consumption

Inactive Publication Date: 2009-05-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of the interface layer between the hydrophobic polymer membrane and the hydrophilic polymer to be adsorbed, the adsorption of the hydrophilic polymer in the membrane pores is limited, which affects the modification efficiency.

Method used

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  • Surface modification method of polymer microporous film
  • Surface modification method of polymer microporous film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Modification process of polyethylene flat film treated with atmospheric pressure plasma.

[0034] Raw materials: polyethylene flat film (film thickness 25 microns, average pore diameter is 0.4 microns, porosity 20%); The aqueous solution of chitosan (the mass percent concentration of chitosan in solution is 6 %, chitosan weight average molecular weight 8000~10000), wherein the aqueous solution of chitosan also contains chlorohydrins, and the quality of chlorohydrins is 5% of chitosan quality.

[0035] After the polyethylene flat film was washed three times with acetone, it was vacuum-dried at room temperature for 3 hours. Carry out atmospheric pressure dielectric barrier discharge plasma treatment to the polyethylene flat film after above-mentioned treatment then, treatment condition is: the gap between discharge electrodes 4 is 2 millimeters; Mixed gas is argon and oxygen (volume ratio is 99 / 1 ), the air intake speed is 4 liters / min; the plasma discharge po...

Embodiment 2

[0036]Embodiment 2: Atmospheric pressure plasma treatment polyethylene hollow fiber membrane modification process

[0037] Raw material: polyethylene hollow fiber membrane (inner diameter 100 micron, outer diameter 500 micron, average pore diameter is 0.8 micron, porosity 40%), the aqueous solution of polyethylene glycol (polyethylene glycol in the solution) that is used for membrane surface dipping The mass percent concentration is 8%, and the weight average molecular weight is 18000-20000), wherein the polyethylene glycol aqueous solution also contains chlorohydrins, and the mass of chlorohydrins is 3% of the polyethylene glycol mass.

[0038] After washing the polyethylene hollow fiber membrane three times with acetone, it was vacuum-dried at room temperature for 3 hours. Carry out atmospheric pressure dielectric barrier discharge plasma treatment to the polyethylene hollow fiber membrane after the above-mentioned treatment then, treatment condition is: the gap between disc...

Embodiment 3

[0039] Example 3: Modification process of polypropylene flat film treated with atmospheric pressure plasma.

[0040] Raw material: polypropylene flat film (film thickness 200 microns, average pore diameter is 1 micron, porosity 60%), is used for the aqueous solution of the polyvinylpyrrolidone of membrane surface dip-coating (mass percentage concentration of polyvinylpyrrolidone in solution is 12%, the weight average molecular weight of polyvinylpyrrolidone is 15000~18000), wherein the aqueous solution of polyvinylpyrrolidone contains potassium persulfate, and the quality of potassium persulfate is 4% of the quality of polyvinylpyrrolidone.

[0041] After the polypropylene flat film was washed three times with acetone, it was vacuum-dried at room temperature for 3 hours. Then carry out atmospheric pressure dielectric barrier discharge plasma treatment to the polypropylene flat film after above-mentioned treatment, treatment condition is: the gap between discharge electrode 4 i...

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Abstract

The invention discloses a microporous membrane surface hydrophilic modification method which comprises the following steps: (1) a polymer microporous membrane is pretreated by utilizing anatmospheric dielectric barrier discharge plasma technology; (2) the treated microporous membrane is arranged into the aqueous solution of a water-soluble polymer for dipping to lead the surface of the microporous membrane to absorb a polymer layer; (3) the microporous membrane is crosslinked and solidified under certain temperature. The method has the characteristics of simple technique, convenient operation, quick processing speed, good processing effect, low cost, being not easy to cause environment pollution, energy saving, and the like.

Description

technical field [0001] The invention relates to a method for modifying the surface of a separation membrane, in particular to a method for modifying the surface of a polymer microporous membrane. technical background [0002] Membrane separation technology is widely used in the separation, purification and purification of water media in the fields of biomedicine, chemical industry, food, energy, water treatment and so on. However, membrane materials such as polyethylene, polypropylene, and polyvinylidene fluoride have poor hydrophilicity, which affects their use. Modifying the surface of this type of microporous membrane by various physical and chemical methods to endow it with good hydrophilicity is a necessary way to broaden its application range. [0003] Plasma technology has the characteristics of good effect, clean and pollution-free, only acts on the surface layer of the material, and has no adverse effect on the bulk performance of the material, so it is also a favo...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/78
Inventor 徐志康钟少锋刘振梅
Owner ZHEJIANG UNIV
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