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Method for constructing super-hydrophobic PVDF nanofiber membrane based on interface self-polymerization and application of super-hydrophobic PVDF nanofiber membrane

A nanofiber membrane and nanofiber technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of complex operation in the preparation process, complex modification devices, uneven modification of porous carriers, etc., and achieve simple preparation process , increased permeation flux, and large industrial application potential

Pending Publication Date: 2021-12-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of non-uniform porous carrier modification, complex preparation process operation and complex modification device in the existing super-hydrophobic surface construction method, and proposes a super-hydrophobic PVDF nanofiber membrane based on interfacial self-polymerization method, applying superhydrophobic PVDF nanofiber membranes to the field of oil-water separation, broadening the application range of superhydrophobic materials

Method used

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  • Method for constructing super-hydrophobic PVDF nanofiber membrane based on interface self-polymerization and application of super-hydrophobic PVDF nanofiber membrane
  • Method for constructing super-hydrophobic PVDF nanofiber membrane based on interface self-polymerization and application of super-hydrophobic PVDF nanofiber membrane
  • Method for constructing super-hydrophobic PVDF nanofiber membrane based on interface self-polymerization and application of super-hydrophobic PVDF nanofiber membrane

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Embodiment 1

[0035] The method for constructing a superhydrophobic PVDF nanofiber membrane based on interfacial self-aggregation proposed by the present invention is used to prepare a superhydrophobic PVDF nanofiber membrane, which specifically includes the following steps:

[0036] Step 1, prepare PVDF nanofiber base film

[0037] Dissolve 6g of PVDF in 44g of N,N-dimethylformamide, heat and stir, and obtain a uniform casting solution after vacuum degassing. The casting solution is injected into a syringe, and a No. 25 needle is installed on the syringe. The casting solution is injected into the booster of the electrospinning equipment, the propulsion speed of the booster is adjusted to 0.08mm / min, the distance between the needle and the receiver is adjusted to 8cm, and it is covered on the receiver of the electrospinning equipment A layer of tinfoil, set the rotation speed of the receiver to 80r / min. Connect the positive high voltage of the high-voltage power supply to the needle of the...

Embodiment 2

[0051] The method for constructing a superhydrophobic PVDF nanofiber membrane based on interfacial self-aggregation proposed by the present invention is used to prepare a superhydrophobic PVDF nanofiber membrane, which specifically includes the following steps:

[0052] Step 1, prepare PVDF nanofiber base film

[0053] Dissolve 6g of PVDF in 44g of N,N-dimethylformamide, heat and stir, and obtain a uniform casting solution after vacuum degassing. The casting solution is injected into a syringe, and a No. 25 needle is installed on the syringe. The casting solution is injected into the booster of the electrospinning equipment, the propulsion speed of the booster is adjusted to 0.08mm / min, the distance between the needle and the receiver is adjusted to 8cm, and it is covered on the receiver of the electrospinning equipment A layer of tinfoil, set the rotation speed of the receiver to 80r / min. Connect the positive high voltage of the high-voltage power supply to the needle of the...

Embodiment 3

[0059] The method for constructing a superhydrophobic PVDF nanofiber membrane based on interfacial self-aggregation proposed by the present invention is used to prepare a superhydrophobic PVDF nanofiber membrane, which specifically includes the following steps:

[0060] Step 1, prepare PVDF nanofiber base film

[0061] Dissolve 6g of PVDF in 44g of N,N-dimethylformamide, heat and stir, and obtain a uniform casting solution after vacuum degassing. The casting solution is injected into a syringe, and a No. 25 needle is installed on the syringe. The casting solution is injected into the booster of the electrospinning equipment, the propulsion speed of the booster is adjusted to 0.08mm / min, the distance between the needle and the receiver is adjusted to 8cm, and it is covered on the receiver of the electrospinning equipment A layer of tinfoil, set the rotation speed of the receiver to 80r / min. Connect the positive high voltage of the high-voltage power supply to the needle of the...

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Abstract

The invention provides a method for constructing a super-hydrophobic PVDF nanofiber membrane based on interface self-polymerization and application of the super-hydrophobic PVDF nanofiber membrane, and particularly relates to the technical field of super-hydrophobic materials. The preparation method comprises the following steps: dissolving PVDF in N, N-dimethylformamide to prepare a membrane casting solution, preparing a PVDF nanofiber base membrane by using an electrostatic spinning process, dissolving OTS containing active groups in an organic solvent, sequentially adding nanoparticles, PDMS and a cross-linking agent to prepare an oil-phase reaction solution, soaking the base membrane in ethanol, cleaning with deionized water, drying water drops on the surface of the base membrane by blowing, pouring the oil-phase reaction solution into the surface of the base membrane, introducing a high-hydrophobicity silane polymer into PDMS in situ by utilizing a hydrolysis self-polymerization reaction of OTS on a water-oil interface, pouring away the oil-phase reaction solution, and cleaning and drying a membrane body to obtain the super-hydrophobic PVDF nanofiber membrane. The method is simple in preparation process, does not need a modification device, is excellent in hydrophobicity and stable in property, is suitable for the fields of oil-water separation, self-cleaning coatings, membrane distillation and the like, and has a good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of superhydrophobic materials, in particular to a method for constructing superhydrophobic PVDF nanofiber membranes based on interfacial self-polymerization and its application. Background technique [0002] In 1972, Cadotte prepared polyamide reverse osmosis membrane through interfacial polymerization process. After more than 40 years of development, interfacial polymerization technology has become the leading technology and leading technology for preparing reverse osmosis membrane. At present, about 95% of polyamide reverse osmosis membrane is Prepared by interfacial polymerization process. Although the interfacial polymerization method has been widely used in the field of membrane technology due to its advantages of simple operation and easy control, there are few studies on the preparation of superhydrophobic surfaces by interfacial polymerization. At present, the commonly used superhydrophobic surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D61/36B01D67/00B01D69/02B01D69/10C02F1/40
CPCB01D71/34B01D69/02B01D69/10B01D67/0006C02F1/40B01D61/364B01D2325/38
Inventor 王明侯影飞蒋驰王梓诚诸浩江项城
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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