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Hydrophilic PVDF (Polyvinylidene Fluoride) composite ultrafiltration membrane and preparation method thereof

A technology of hydrophilic and ultrafiltration membranes, which is applied in the field of PVDF composite ultrafiltration membranes and its preparation, can solve the problems of reduced service life, easy adsorption of proteins, and weak anti-pollution ability of PVDF ultrafiltration membranes, and achieve good improvement effects, The operation method is simple, and the effect of choosing a dense layer

Active Publication Date: 2013-11-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the existing PVDF ultrafiltration membrane has strong hydrophobicity and weak anti-pollution ability, which makes its surface easy to adsorb pollutants such as proteins, thereby reducing the service life of the PVDF ultrafiltration membrane, and provides a hydrophilic PVDF membrane. Composite ultrafiltration membrane and preparation method thereof

Method used

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  • Hydrophilic PVDF (Polyvinylidene Fluoride) composite ultrafiltration membrane and preparation method thereof
  • Hydrophilic PVDF (Polyvinylidene Fluoride) composite ultrafiltration membrane and preparation method thereof
  • Hydrophilic PVDF (Polyvinylidene Fluoride) composite ultrafiltration membrane and preparation method thereof

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specific Embodiment approach 1

[0014] Specific embodiment 1: In this embodiment, a hydrophilic PVDF composite ultrafiltration membrane is prepared by blending the reaction product of PVDF, dopa-type auxiliaries and epoxy-terminated PEO; the hydrophilic PVDF composite ultrafiltration membrane is prepared by blending. The membrane pure water flux is 193L / m 2 .h~193.7L / m 2 .h, the protein retention rate was 96.1%-98.7%, and the recovery flux after physical cleaning of the membrane was 84%-88%.

[0015] In this embodiment, the reaction product of dopa-based auxiliaries with bioadhesive properties and reactive functional groups and hydrophilic terminated epoxy PEO is blended with PVDF, and the immersion precipitation phase inversion method is used to prepare a highly hydrophilic PVDF composite ultrafiltration membrane.

[0016] This embodiment is simple to operate, has good improvement effect, and obtains a PVDF composite ultrafiltration membrane with strong hydrophilicity, which enhances its hydrophilic perfo...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the dopa-type adjuvant is dopamine hydrochloride or dopamine. Others are the same as the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the structural formula of the epoxy-terminated PEO is: The molecular weight is 200-1000. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a hydrophilic PVDF (Polyvinylidene Fluoride) composite ultrafiltration membrane and a preparation method thereof, relates to membranes and preparation methods thereof and particularly relates to PVDF composite ultrafiltration membranes and preparation methods thereof. The hydrophilic PVDF composite ultrafiltration membrane and the preparation method thereof are used for solving the problem that the service lives of the existing PVDF ultrafiltration membranes are shortened because contaminants of protein and the like are easily adsorbed to the surfaces of the existing PVDF ultrafiltration membranes caused by the fact that the existing PVDF ultrafiltration membranes are strong in hydrophobicity and weak in contamination resistance. The hydrophilic PVDF composite ultrafiltration membrane disclosed by the invention is prepared through blending PVDF, a dopa assistant and a reaction product of end-epoxy PEO (Polyoxyethylene). The preparation method comprises the steps of dissolving the dopa assistant into a solvent, adding end-epoxy PEO so as to obtain a mixed solution, then adding PVDF powder in the mixed solution so as to obtain a blended membrane casting solution, standing the blended membrane casting solution until no bubbles exist, uniformly coating the blended membrane casting solution on a glass plate by using a scraping cutter, and obtaining the hydrophilic PVDF composite ultrafiltration membrane by using an immersion precipitation phase conversion method. The preparation method can be used for preparing the hydrophilic PVDF composite ultrafiltration membrane.

Description

technical field [0001] The invention relates to a membrane and a preparation method thereof, in particular to a PVDF composite ultrafiltration membrane and a preparation method thereof. Background technique [0002] About 97% of the water on the earth is seawater, and fresh water only accounts for 2.5% of the total water reserves on the earth. Economic development, population growth, environmental pollution and other issues have created a great demand for freshwater resources. The scarcity of water resources and increasingly serious water pollution have become the bottleneck restricting social progress and economic development. is very urgent and extremely important. Ultrafiltration technology is widely regarded as a very promising technology in drinking water production due to its simple operation, easy automation, and high removal rate of turbid liquids, organic substances (such as humic substances), giardia and viruses. technology. The pore size of the ultrafiltration ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D67/00C02F1/44
Inventor 邵路常晓晶姜再兴
Owner HARBIN INST OF TECH
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