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Method for constructing super-hydrophilic layer of polyvinylidene fluoride hollow fiber ultrafiltration membrane

A polyvinylidene fluoride and ultrafiltration membrane technology, which is applied in the field of materials, can solve the problems of a small increase in the hydrophilic modification effect, a low graft rate, and a low concentration, and achieves a good hydrophilic modification effect. High branch rate, stable and long-lasting effect

Inactive Publication Date: 2014-01-29
HARBIN INST OF TECH
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Problems solved by technology

This method uses strong alkali and potassium permanganate solution to treat polyvinylidene fluoride microporous membrane, and then grafts acrylic acid to the surface of PVDF membrane under the action of organic initiator. It is the disadvantage that the grafting rate is not high and the effect of hydrophilic modification is not greatly improved.

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  • Method for constructing super-hydrophilic layer of polyvinylidene fluoride hollow fiber ultrafiltration membrane
  • Method for constructing super-hydrophilic layer of polyvinylidene fluoride hollow fiber ultrafiltration membrane
  • Method for constructing super-hydrophilic layer of polyvinylidene fluoride hollow fiber ultrafiltration membrane

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[0028] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited to this. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the technical solution of the present invention. in the scope of protection.

[0029] 1. Clean the PVDF hollow fiber ultrafiltration membrane with deionized water and immerse it in water for 6-12 hours;

[0030] 2. Immerse the cleaned PVDF hollow fiber ultrafiltration membrane in a mixed aqueous solution composed of 1.0-2.0mol / L NaOH aqueous solution and 2.0-3.50% potassium permanganate for 20-30 minutes;

[0031] 3. Use deionized water to wash the PVDF hollow fiber ultrafiltration membrane treated in the second step, and then store it in deionized water for 5-10 hours;

[0032] 4. Immerse the PVDF hollow fi...

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Abstract

The invention provides a method for constructing a super-hydrophilic layer of a polyvinylidene fluoride hollow fiber ultrafiltration membrane and belongs to the technical field of materials. The method comprises the following steps of: generating C-C unsaturated bonds, hydroxyls and carboxyls on the surface of the polyvinylidene fluoride (PVDF) ultrafiltration membrane through pretreatment by using the mixed solution of a strong base and potassium permanganate, respectively grafting hydrophilic acrylic acid and alcohol monomers to the surface of the PVDF ultrafiltration membrane by free radical grafting reaction and esterification reaction under the actions of an inorganic acidic catalyst and an organic peroxide initiator, wherein a stable super-hydrophilic layer is constructued on the surface of the membrane under the synergic action of the two monomers to obstruct the adsorption and deposition of organic matters on the surface of the membrane efficiently. Consequently, the PVDF hollow fiber ultrafiltration membrane is provided with high resistance to organic matter pollution and super hydrophilicity; after super hydrophilic modification treatment, the water flux of the PVDF hollow fiber ultrafiltration membrane is 100-200% higher than before.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a method for constructing a superhydrophilic layer of a polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membrane. Background technique [0002] Membrane separation technology is a green and efficient new separation technology. Ultrafiltration has broad prospects in the fields of water purification, chemical separation and biological separation. At present, membrane flux and membrane fouling are still the technical bottlenecks restricting the application efficiency of ultrafiltration. The hydrophilic property of membrane material surface is a key factor affecting membrane organic fouling, and improving the hydrophilic property of membrane material surface is an effective way to increase membrane water flux and reduce membrane organic fouling. Polyvinylidene fluoride (PVDF) ultrafiltration membrane is the most widely used membrane material on the market. However, due ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 张春华刘雅薇赵锦豪于洪涛
Owner HARBIN INST OF TECH
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