A kind of preparation method of superhydrophobic PVDF film

A superhydrophobic and hydrophobic technology, which is applied in the field of superhydrophobic PVDF membrane preparation, can solve membrane wetting and other problems, achieve the effect of alleviating membrane wetting and improving anti-wetting performance

Active Publication Date: 2019-03-19
TIANJIN POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a method for preparing a superhydrophobic PVDF membrane, which overcomes the problem of membrane wetting encountered in the application process of the hydrophobic membrane in the prior art

Method used

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  • A kind of preparation method of superhydrophobic PVDF film
  • A kind of preparation method of superhydrophobic PVDF film
  • A kind of preparation method of superhydrophobic PVDF film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 8.6ml polyethylene glycol-400 and add it to 153ml N-methylpyrrolidone, make it mix well. Then add 36g of PVDF to the above solution while stirring, stir for 12 hours under the condition of constant temperature heating in a water bath at 60°C to dissolve it completely, and leave it in a vacuum oven at 40°C for 12 hours to obtain a uniform casting solution after degassing; weigh 1g of graphite Add olefin to 1000ml methanol, disperse evenly and add 2000ml deionized water to make a coagulation bath. Use a scraper to scrape the casting solution on a glass plate to prepare a nascent flat film, stay in the air for 30s, and then place the nascent flat film in the coagulation bath prepared above until it solidifies into a PVDF film; put the film in deionized water Soak for 24 hours, thoroughly remove the residual solvent in the membrane, and dry at room temperature to obtain the superhydrophobic PVDF membrane. The PVDF membrane prepared in Example 1 was tested and found th...

Embodiment 2

[0027] Take 9.2ml polyethylene glycol-600 and add it to 165ml N,N-dimethylformamide, make it mix well. Then add 40g of PVDF into the above solution while stirring, stir for 12h under the condition of constant temperature heating in a water bath at 60°C to dissolve it completely, and leave it in a vacuum oven at 40°C for 12h to obtain a uniform casting solution after defoaming; weigh 1g of alkane TiO 2 The nanoparticles were added into 1000ml of absolute ethanol, dispersed evenly, and then added into 1000ml of deionized water to prepare a coagulation bath. Use a scraper to scrape the casting solution on a glass plate to prepare a nascent flat film, stay in the air for 30s, and then place the nascent flat film in the coagulation bath prepared above until it solidifies into a PVDF film; put the film in deionized water Soak for 24 hours, thoroughly remove the residual solvent in the membrane, and dry at room temperature to obtain the superhydrophobic PVDF membrane. The PVDF memb...

Embodiment 3

[0029] Take 8.6ml polyethylene glycol-400 and add it to 153ml N-methylpyrrolidone, make it mix well. Then add 36g of PVDF to the above solution while stirring, stir for 12 hours under the condition of constant temperature heating in a water bath at 60°C to dissolve it completely, and leave it in a vacuum oven at 40°C for 12 hours to obtain a uniform casting solution after degassing; weigh 1g of fluorine SiO 2 The nanoparticles were added into 1000ml of N-methylpyrrolidone, dispersed uniformly and then added into 1000ml of deionized water to prepare a coagulation bath. Use a scraper to scrape the casting solution on a glass plate to prepare a nascent flat film, stay in the air for 30s, and then place the nascent flat film in the coagulation bath prepared above until it solidifies into a PVDF film; put the film in deionized water Soak for 24 hours, thoroughly remove the residual solvent in the membrane, and dry at room temperature to obtain the superhydrophobic PVDF membrane. ...

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Abstract

The invention discloses a preparation method of a super-hydrophobic PVDF (polyvinylidene fluoride) membrane. The method mainly comprises the following steps: preparing a PVDF membrane casting solution and preparing a mixed coagulating bath; preparing a primary flat-sheet membrane or spinning a hollow fiber membrane by a hollow spinneret; leaving the primary membrane to stand in air, placing the primary membrane in the coagulating bath, and soaking a product in deionized water after complete curing to remove residual organic matter to obtain the super-hydrophobic PVDF composite membrane. The super-hydrophobic PVDF membrane prepared with the method shows a spherically stacked zero-defect cascade porous structure, surfaces of PVDF microspheres separated out of the surface layer and the inside of the membrane show a micro-nano-binary microstructure like a lotus leaf surface, so that the membrane surface and membrane pores all show the super-hydrophobic characteristic, and the wetting resistance of the membrane is improved fundamentally. The preparation method of the super-hydrophobic PVDF membrane has the advantages that the preparation process is simple, the operability is high and the like. The defect that the wetting resistance effect of super-hydrophobic modification of single membrane surface is not lasting is overcome, and the method is applicable to membrane processes such as membrane distillation, membrane absorption and the like.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a method for preparing a superhydrophobic PVDF membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) is a white powder under normal conditions and is a hydrophobic polymer material containing fluorine. Its outstanding features are high heat resistance, solubility and mechanical strength, and good chemical stability. It is not corroded by acids, alkalis, strong oxidants and halogens at room temperature, and can be dissolved in strong polar organic solvents to form Colloidal solution. Compared with other hydrophobic polymer materials, such as PP and PTFE, PVDF has been paid attention to because it can be prepared into microporous membranes by a simple non-solvent-induced phase transfer method, but it is not suitable for membrane contact in membrane distillation, pervaporation, and membrane absorption. During the operation of the device, the membrane wetting cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/34B01D69/02B01D69/06
CPCB01D67/0011B01D67/0016B01D69/02B01D69/06B01D71/34B01D2323/04B01D2325/38
Inventor 王亮吴晓娜赵斌张朝晖李君敬赵新华张宏伟黄秀秀孙骞徐腾遥
Owner TIANJIN POLYTECHNIC UNIV
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