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Method for improving pollution resistance of PVDF (polyvinylidene fluoride) porous membrane based on plasmas technology

A technology of polyvinylidene fluoride and plasma, which is applied in the direction of membrane technology, chemical instruments and methods, and semipermeable membrane separation, can solve the problems of large damage, serious pollution of strong acid and strong alkali waste liquid, etc., to improve the surface properties of the membrane, The effect of improving the anti-pollution ability

Inactive Publication Date: 2014-06-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current PVDF membrane modification methods, the chemical method has great damage to the membrane itself, and the strong acid and alkali waste liquid generated is seriously polluted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put a certain length of PVDF hollow fiber membrane in pure ethanol solution to fully clean, remove impurities such as glycerin in the membrane pores, dry it and place it in the discharge chamber of a low-temperature plasma instrument for pretreatment. The pretreatment conditions are: membrane The distance between the electrode and the electrode is 10 cm, the discharge gas in the chamber is argon, the discharge power is 50 watts, the treatment time is 60 seconds, and the gas pressure is 20 Pa. Afterwards, the membrane was quickly soaked in a polyethylene glycol (PEG) solution (solvent is water) with a mass fraction of 10% and a molecular weight of 10,000, placed in a water bath shaker for full adsorption for 12 hours, and then taken out to dry. Then the PVDF hollow fiber membrane is placed in the discharge chamber of the low-temperature plasma instrument for modification treatment. The treatment conditions are: the distance between the membrane and the electrode is 5 cm, ...

Embodiment 2

[0021] Put a 10×10 cm PVDF flat membrane in pure ethanol solution to fully clean it, remove impurities such as glycerin in the membrane pores, and place it in the discharge chamber of a low-temperature plasma instrument for pretreatment after drying. The pretreatment conditions are: The distance between the membrane and the electrode is 10 cm, the discharge gas flowing into the chamber is argon, the discharge power is 50 watts, the treatment time is 100 seconds, and the gas pressure is 20 Pa. Afterwards, the membrane was quickly soaked in a polyethylene glycol (PEG) solution (solvent is water) with a mass fraction of 10% and a molecular weight of 10,000, placed in a water bath shaker for full adsorption for 12 hours, and then taken out to dry. Then the PVDF hollow fiber membrane is placed in the discharge chamber of the low-temperature plasma instrument for modification treatment. The treatment conditions are: the distance between the membrane and the electrode is 5 cm, the dis...

Embodiment 3

[0023] Put a certain length of PVDF hollow fiber membrane in pure ethanol solution to fully clean, remove impurities such as glycerin in the membrane pores, dry it and place it in the discharge chamber of a low-temperature plasma instrument for pretreatment. The pretreatment conditions are: membrane The distance between the electrode and the electrode is 10 cm, the discharge gas in the chamber is argon, the discharge power is 50 watts, the treatment time is 300 seconds, and the gas pressure is 20 Pa. Afterwards, the film was quickly soaked in a polyacrylic acid (PAA) solution (water as a solvent) with a mass fraction of 20% and a molecular weight of 3000, placed in a water bath shaker for full adsorption for 12 hours, and then taken out to dry. Then the PVDF hollow fiber membrane is placed in the discharge chamber of the low-temperature plasma instrument for modification treatment. The treatment conditions are: the distance between the membrane and the electrode is 5 cm, the di...

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Abstract

The invention provides a method for improving the pollution resistance of a PVDF (polyvinylidene fluoride) porous membrane based on a plasmas technology. The method is characterized by specifically comprising the following steps of 1. cleaning the PVDF porous membrane to remove impurities, carrying out air-drying on the PVDF porous membrane, and arranging the PVDF porous membrane in a low-temperature plasma instrument for pretreatment; 2. impregnating the pretreated PVDF porous membrane in a target polymer solution for adsorption, and carrying out air-drying on the impregnated PVDF porous membrane, wherein a target polymer in the target polymer solution is a hydrophilic polymer, a solvent is water or an acidic aqueous solution, and the mass concentration of the target polymer solution is 1 to 20 percent; 3. arranging the PVDF porous membrane treated in the step 2 in the low-temperature plasma instrument for modification treatment, and cleaning the modified PVDF porous membrane. According to the method, the target polymer is grafted to the surface of the PVDF porous membrane to improve the surface properties of the membrane and improve the pollution resistance of the surface of the membrane; the membrane surface modification method is simple and easy to implement, and applicable to large-scale production, and has energy-saving and environment-friendly effects.

Description

technical field [0001] The invention belongs to the field of membrane surface modification, and particularly relates to a method for introducing a hydrophilic polymer with good antifouling effect on the surface of a PVDF porous membrane to improve its antifouling ability. Specifically, through low-temperature plasma treatment, the target polymer is directly bonded to the membrane surface, permanently changing the surface properties of the porous membrane. Background technique [0002] At present, membrane separation technology has become an important means of water treatment, but the problem of membrane fouling has greatly reduced the service life of membranes and restricted the further promotion and application of membrane technology. PVDF membrane has good thermal stability, chemical stability and mechanical properties, making it one of the most used membrane materials, but due to its extremely low surface energy and strong hydrophobicity after film formation, it is very e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D71/34B01D69/02B01D67/00
Inventor 何春菊赵新振马博谋秦爱文刘大朋李翔
Owner DONGHUA UNIV