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Preparation method and application of PVDF-PVP highly porous membrane

A PVDF-PVP, porous membrane technology, applied in the field of composite materials, can solve the problems of poor hydrophilicity, high modulus, low porosity, etc., and achieve the effect of high compatibility

Active Publication Date: 2019-04-12
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polyvinylidene fluoride (PVDF) membrane has excellent separation performance and chemical and thermal stability. In recent years, it has gradually attracted people's attention in membrane separation technology, but it also has disadvantages such as low porosity, poor hydrophilicity, and high modulus.

Method used

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  • Preparation method and application of PVDF-PVP highly porous membrane
  • Preparation method and application of PVDF-PVP highly porous membrane
  • Preparation method and application of PVDF-PVP highly porous membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation of PVDF-PVP highly porous membrane by pouring method: Weigh 2g of PVDF and 1g of PVP solid powder in a beaker, add 20ml of DMF solvent, heat to 60°C to dissolve, mix well, and then add 1g of ionic liquid 1-ethyl-3-methylimidazolium tetra The fluoroborate was stirred and mixed evenly, and the air bubbles in the solution were removed by vacuuming to obtain a PVDF-PVP film solution; the prepared PVDF-PVP film solution was cast in a mold, put into an oven at a temperature of 70°C to form a film, and obtained The PVDF-PVP-IL membrane was taken out and placed in water to soak for 6 hours to remove the ionic liquid IL and part of the PVP in the membrane to obtain a PVDF-PVP highly porous membrane (sample 3), PVDF-PVP porous membrane (filter membrane) ball The scanning electron microscope image of crystal particles is shown in image 3 As shown, the surface scanning electron microscope image of PVDF-PVP porous membrane is as follows Figure 5 as shown, Image 6 It ...

Embodiment 2

[0029] The preparation method of the PVDF-PVP highly porous membrane of this embodiment, the steps are as follows:

[0030] (1) Preparation of PVDF-PVP-ionic liquid blended membrane prepolymer solution: Weigh PVDF and PVP solid powders of different qualities, add DMF solvent, heat to dissolve, stir and mix evenly, and then add ionic liquid 1-ethyl- 3-Methylimidazolium tetrafluoroborate was stirred and mixed evenly, and the bubbles in the solution were removed by vacuuming to obtain a PVDF-PVP-ionic liquid membrane solution; the mass ratio of PVDF and PVP solid powder was 60:40, and 1g of PVDF solid Based on the quality of the powder, 1.2 g of 1-ethyl-3-methylimidazolium tetrafluoroborate is required;

[0031] (2) Preparation of PVDF-PVP highly porous membrane: Cast the PVDF-PVP membrane solution prepared in step (1) into a mold, put it in an oven to form a membrane at 65°C, and obtain a PVDF-PVP-ionic liquid membrane , Take it out and soak in water for 3 hours to remove the i...

Embodiment 3

[0033] The preparation method of the PVDF-PVP highly porous membrane of this embodiment, the steps are as follows:

[0034](1) Preparation of PVDF-PVP-ionic liquid blended membrane prepolymer solution: Weigh PVDF and PVP solid powders of different qualities, add DMF solvent, heat to dissolve, stir and mix evenly, and then add ionic liquid 1-ethyl- 3-Methylimidazolium tetrafluoroborate was stirred and mixed evenly, and the air bubbles in the solution were removed by vacuuming to obtain a PVDF-PVP-ionic liquid membrane solution; the mass ratio of PVDF and PVP solid powder was 50:50, and 1g of PVDF solid Based on the quality of the powder, 0.5 g of 1-ethyl-3-methylimidazolium tetrafluoroborate is required;

[0035] (2) Preparation of PVDF-PVP highly porous membrane: Cast the PVDF-PVP membrane solution prepared in step (1) into a mold, put it in an oven to form a membrane at 60°C, and obtain a PVDF-PVP-ionic liquid membrane After taking it out, soak it in water for 4 hours to rem...

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Abstract

The invention discloses a preparation method and application of a PVDF-PVP highly porous membrane. The porous membrane is formed by accumulation of PVDF and PVP co-crystallized spherocrystals. The preparation method includes: adding PVDF and PVP solid powder into a DMF solvent, then adding ionic liquid 1-ethyl-3-methylimidazole tetrafluoroborate, mixing the substances evenly, conducting standing and vacuum pumping to remove bubbles from the solution, thus obtaining a PVDF-PVP-ionic liquid membrane solution; pouring the solution in a die, putting the die into an oven for film formation at 50-70DEG C, then taking the film out and performing soaking in water for 2-6h, removing the ionic liquid 1-ethyl-3-methylimidazole tetrafluoroborate and part of PVD from the film, thus obtaining the PVDF-PVP highly porous membrane. According to the invention, the gaps among the spherocrystals of PVDF and PVP are intercommunicated to form through-holes, thus benefiting mass transfer. The PVDF-PVP highlyporous membrane can also be used as a water filtration membrane.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method and application of a PVDF-PVP highly porous membrane. Background technique [0002] With the development of industry, the pollution of the water environment is becoming more and more serious. How to efficiently and quickly remove water pollution is a hot topic in today's society. A large amount of wastewater containing heavy metal ions is produced in the production process of metallurgy, chemical industry, electronics and other industries. Great harm to human health. Common heavy metal wastewater treatment methods include chemical precipitation, electrolysis, etc., but these methods all have problems such as high energy consumption and secondary pollution. Membrane separation technology has the advantages of low energy consumption, small footprint, small pollution, good separation effect, high degree of equipment integration, continuo...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/34B01D71/38C02F1/44
CPCB01D67/0002B01D69/02B01D69/12B01D71/34B01D71/38B01D2325/36C02F1/44
Inventor 郭东杰马丽韩宇兵王龙黄建建弋皓月
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY