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Hydrophilic modification method of polymer microporous film

A microporous membrane and polymer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of decay of effect with time, long time consumption of graft polymerization reaction, unsuitable for industrial production, etc. , to achieve the effect of simple equipment, widening the scope of application and mild conditions

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

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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
[0006] 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

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Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Atmospheric pressure plasma treatment polyethylene flat membrane modification process

[0038]Polyethylene flat film (film thickness 25 microns, average pore diameter is 0.4 microns, porosity 20%) is washed 3 times with acetone, to remove the impurity adsorbed on the film surface, then it is vacuum-dried at room temperature for 3 hours and is ready to use. Soak the above-mentioned cleaned and dried polyethylene flat film in an acetone solution containing 1% acrylic acid by mass percentage for 30 minutes to fully absorb acrylic acid monomer on its surface, and then dry it in the air.

[0039] Then carry out atmospheric pressure dielectric barrier discharge plasma treatment to the polyethylene flat film after above-mentioned treatment, treatment condition is: the gap between discharge electrode is 2 millimeters; Mixed gas is argon and oxygen, and volume ratio is 99 / 1, The air intake speed is 4 liters / min; the plasma discharge power is 150 watts, the film lin...

Embodiment 2

[0041] Embodiment 2: Atmospheric pressure plasma treatment polyethylene flat membrane modification process

[0042] Polyethylene flat film (film thickness 200 microns, average pore diameter is 1 micron, porosity 60%) is washed 3 times with acetone, to remove the impurity that is adsorbed on the film surface, then it is vacuum-dried at room temperature for 3 hours stand-by. Soak the washed and dried polyethylene flat film in an acetone solution containing 8% N-vinylpyrrolidone by mass percentage for 30 minutes to fully absorb N-vinylpyrrolidone monomer on its surface, and then dry it in the air.

[0043] Then carry out atmospheric pressure dielectric barrier discharge plasma treatment to the polyethylene flat film after above-mentioned treatment, treatment condition is: the gap between discharge electrode is 2 millimeters; Mixed gas is argon and oxygen, and volume ratio is 99 / 1, The air intake speed is 6 liters / min; the plasma discharge power is 120 watts, the film line speed i...

Embodiment 3

[0045] Embodiment 3: Atmospheric pressure plasma treatment polyethylene hollow fiber membrane modification process

[0046] The polyethylene hollow fiber membrane (inner diameter 100 microns, outer diameter 500 microns, average pore diameter 0.8 microns, porosity 50%) was washed 3 times with acetone to remove impurities adsorbed on the membrane surface, and then vacuum-dried at room temperature 3 hours to use. Soak the cleaned and dried polyethylene hollow fiber membrane in an acetone solution containing 10% acrylamide by mass percentage for 30 minutes to fully absorb acrylamide monomer on its surface, and then dry it.

[0047] Then carry out atmospheric pressure dielectric barrier discharge plasma treatment to the polyethylene flat film after above-mentioned treatment, treatment condition is: the gap between discharge electrode is 2 millimeters; Mixed gas is argon and oxygen, and volume ratio is 99 / 1, The air intake speed is 4 liters / min; the plasma discharge power is 150 wa...

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Abstract

The invention discloses a method of atmospheric dielectric barrier discharge plasma to carry out polymer microporous membrane hydrophilic modification. The method comprises the following steps: (1) the polymer microporous membrane is cleaned clearly, dried and then arranged into the solution of an organic monomer for dipping; after the surface of the microporous membrane absorbs the organic monomer, the microporous membrane is taken out and aired; (2) the polymer microporous membrane treated by the step (1) is arranged between the two discharge electrodes of the dielectric barrier discharge to carry out atmospheric dielectric barrier discharge plasma treatment; (3) the polymer microporous membrane treated by step (2) is cleaned and then dried. The method has the characteristics of simple technique, convenient operation, quick processing speed, good and durable 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 polymer microporous membranes, in particular to a method for surface treatment of polymer microporous membrane materials with organic monomers adsorbed on the surface by atmospheric pressure plasma to improve hydrophilicity. 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). These polymer materials have low polarity and poor hydrophilic properties, so the use of polymer microporous membranes based on these materials in water treatment is also affected. Modifying the surface of these polymer microporous membranes by various physical and chemical methods to endow them with good hydrophilicity is an effective w...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/78
Inventor 徐志康钟少锋黄小军
Owner ZHEJIANG UNIV
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