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Preparation method of polyvinylidene fluoride mixed matrix membrane

A polyvinylidene fluoride and mixed matrix membrane technology, which is applied in the field of membrane separation, can solve the problems of low retention rate and poor anti-pollution ability of the vinylidene fluoride mixed matrix membrane, and achieves easy control of preparation process conditions and excellent anti-pollution. The effect of mild performance and preparation process conditions

Active Publication Date: 2020-10-13
SHANGHAI INST OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a uniform sponge-like polymer polylidene fluoride film with high rejection rate and strong pollution resistance in order to overcome the defects of low rejection rate and weak anti-pollution ability of the vinylidene fluoride mixed matrix membrane existing in the above-mentioned prior art. Preparation method of vinyl fluoride mixed matrix membrane

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  • Preparation method of polyvinylidene fluoride mixed matrix membrane
  • Preparation method of polyvinylidene fluoride mixed matrix membrane
  • Preparation method of polyvinylidene fluoride mixed matrix membrane

Examples

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preparation example Construction

[0033] A method for preparing a uniform sponge-like polyvinylidene fluoride mixed matrix membrane with high rejection rate and strong anti-pollution property. In this method, nano-SnO 2 It is compounded with graphene oxide and added to the polyvinylidene fluoride casting solution, and the polyvinylidene fluoride casting solution is made into the polyvinylidene fluoride mixed matrix membrane by using a non-solvent-induced phase separation method (NIPS). The specific steps of the method include the following steps:

[0034] (1) Nano-SnO 2 - Preparation of graphene oxide composites

[0035] Dissolve 0.1-0.5g of graphene oxide in 60-180ml of ethanol aqueous solution with a volume ratio of ethanol and water of 1-4:0.5-2, sonicate, and then add 0.1-1g of nano-SnO 2 , and then stirred and sonicated to make nano-SnO 2 React with graphene oxide. The reaction conditions are to react at normal temperature and pressure for 100-150 minutes to obtain a suspension; the suspension is centr...

Embodiment 1

[0042] This example is for the preparation of SnO 2 -GO composite material, the specific preparation method is as follows:

[0043] (1) 0.2 g GO was dissolved in a mixed solution containing 50 mL ethanol and 40 mL deionized water, and sonicated for 1 h to completely disperse GO.

[0044] (2) 0.6g SnO 2 Add to the dispersion obtained in step (1), and continue to stir for 30min and sonicate for 1h to form a uniform suspension.

[0045] (3) Then, the resulting product was recovered by centrifugation by rinsing with deionized water, and vacuum-dried at 50°C. For the obtained SnO 2 -GO composites were characterized to obtain SnO 2 -TEM images of GO composites, such as figure 1 As shown, it can be seen from the electron microscope photos that this embodiment has obtained uniformly dispersed SnO 2 -GO composites.

Embodiment 2

[0047] This embodiment is to utilize the SnO in embodiment 1 2 -GO composite material to further prepare polyvinylidene fluoride mixed matrix membrane, the specific preparation method is as follows:

[0048] (1) The composite material SnO 2 -GO, PVP, PVDF are dissolved in DMF, the composition ratio is: SnO 2 -GO:PVP:PVDF=0.3:2:20, stir at 80°C to fully dissolve, then let it stand for 24 hours for defoaming;

[0049] (2) Scrape the casting solution of step (1) on a glass plate to a film with a thickness of 250 μm;

[0050] (3) Immerse the glass plate with the film solution in step (2) in a mixture of ethanol and deionized water at a volume ratio of 1:1 at 15°C for phase separation;

[0051] (4) Transfer the film after phase separation in step (3) to deionized water and soak for 8 days to remove excess solvent, and then put it into clean deionized water for preservation to obtain a polyvinylidene fluoride mixed matrix film, which is denoted as SnO 2 - GO / PVDF ultrafiltration...

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Abstract

The invention relates to a preparation method of a uniform sponge porous polyvinylidene fluoride mixed matrix membrane with high rejection rate and strong pollution resistance. The preparation methodcomprises the following steps: preparing a polyvinylidene fluoride membrane casting solution containing a nano SnO2-graphene oxide composite material, and preparing the polyvinylidene fluoride mixed matrix membrane from the polyvinylidene fluoride membrane casting solution by using a non-solvent induced phase separation method. Compared with like membranes in the prior art, the ultrafiltration membrane prepared by the preparation method has the advantages of excellent anti-pollution performance, high rejection rate, simple preparation method and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a preparation method of a polyvinylidene fluoride mixed matrix membrane. Background technique [0002] Membrane separation technology is a popular green separation technology in recent years. Polyvinylidene fluoride (PVDF) is one of the preferred materials for making ultrafiltration membranes due to its heat resistance, corrosion resistance, radiation resistance, outstanding dielectric properties and chemical stability. Common nanoparticles in PVDF include SnO 2 、TiO 2 , Al2O3 and graphene oxide (GO), etc. However, the incorporation of inorganic particles into organic polymers will lead to uneven dispersion of the hybrid system, which may affect the morphology of the film, while the agglomeration of nanoparticles will lead to poor compatibility with the organic phase. Due to its large specific surface area and large number of functional groups, GO can adsorb metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/34
CPCB01D67/0079B01D71/024B01D71/34B01D69/02B01D2325/36B01D2325/24Y02E60/10
Inventor 陈桂娥陈镇汪洋刘连静万佳俊谢焕银李怡静许振良
Owner SHANGHAI INST OF TECH
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