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Hydrophilic modification method of high-flux PVDF porous membrane

A porous membrane and hydrophilization technology, applied in the field of membrane materials, can solve the problems of incomplete dispersion, affect the modification effect, uneven liquid phase of the casting liquid, etc., and achieve the effect of good hydrophilic performance and large flux.

Active Publication Date: 2019-04-16
WUHAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

This technology directly adds the metal ion solution to the tannic acid mixed solution, so that the water phase is introduced into the mixed system, making it difficult for PVDF to blend into the water phase, and it is easy to cause problems such as uneven liquid phase and incomplete dispersion of the casting liquid, thus affecting the final improvement. sexual effect

Method used

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  • Hydrophilic modification method of high-flux PVDF porous membrane
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  • Hydrophilic modification method of high-flux PVDF porous membrane

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Embodiment 1

[0026] Weigh 15g PVDF powder, 1g porogen PVP, 0.75g tannin and 83.25g organic solvent DMF. Add the weighed organic solvents DMF and tannin to the three-necked flask, and place the three-necked flask in a constant temperature water bath at 40°C for 10 minutes. Then add PVDF powder and porogen PVP into the three-necked flask, stir and react for 24h to obtain a uniform, Stable casting liquid. Place the casting solution in a vacuum drying oven at 50° C., and defoam for 12 hours to fully discharge the bubbles in the casting solution. Pour the casting solution on a clean glass plate, scrape out a flat film with a uniform thickness with a 100μm thick film knife, and immediately put the glass plate into a 20℃, 0.04mol / L iron ion aqueous solution (pH= 6. In other embodiments, the pH is between 5-6). After the film is formed and the film is automatically separated from the glass plate, continue to soak in the above coagulation solution for 5 hours to ensure that the film structure is c...

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Abstract

The invention relates to a hydrophilic modification method of a high-flux PVDF porous membrane. The method comprises the following steps that PVDF powders, tannic acid and PVP are used as raw materials, firstly the PVDF porous membrane is prepared by adopting a phase inversion method, a metal ion solution is used as coagulation bath, by means of the strong complexing capacity of tannic acid with metal ions, a relatively stable molecular chain interpenetrating network structure is formed on the surface of the membrane and inside the membrane, thereby effectively complexing with tannic acid containing a plurality of hydrophilic groups, and the tannic acid has good complexation with PVP, so that more PVP is fixed, and finally a composite hydrophilic channel of tannic acid-PVP-metal ion is formed inside the membrane, so that a PVDF modified membrane with high flux and better hydrophilicity is prepared. The preparation method has the advantages of being wide in raw material source, low in preparation cost and simple in processing technology, and being beneficial for bulk production and marketization application and popularization, and meeting green environmental protection requirements.

Description

Technical field [0001] The invention relates to the technical field of membrane materials, in particular to a hydrophilization modification method of a high-flux PVDF porous membrane. Background technique [0002] Water is the most basic natural resource for human survival. With the continuous development of the social economy, the amount of sewage discharge is increasing, and sewage treatment is urgent. Membrane separation technology is called the 21st century water treatment technology. It usually uses selective porous membranes as the separation medium and uses a certain driving force (such as pressure difference, concentration difference, potential difference, etc.) to pass the solution to be separated through the membrane material. Low-molecular solutes permeate the membrane and macromolecular solutes are retained, so as to separate substances of different molecular weights in the solution, so as to achieve the purpose of separation, concentration and purification. Compare...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00C02F1/40
CPCB01D67/0011B01D69/02B01D71/34B01D2325/36C02F1/40
Inventor 吴力立罗硕邓小辉卢璐柳聪
Owner WUHAN UNIV OF TECH
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