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Type-C core-shell nanofiber membrane and eccentric-shaft electrostatic spinning preparation method thereof

A nanofiber membrane and electrospinning technology, which is applied in electrospinning, fiber treatment, chemical instruments and methods, etc., can solve the problems of easy wetting of membrane pores, low membrane porosity, and low thermal conversion efficiency, and achieve improved porosity The effect of low, increased porosity, and simple and easy preparation method

Inactive Publication Date: 2016-06-22
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a hydrophobic C-type core-shell nanofiber membrane with a groove structure for membrane distillation prepared by eccentric shaft electrospinning and a preparation method thereof. The product membrane obtained by the invention is efficient and durable, The preparation method is simple and easy, and can significantly improve the defects of low porosity, low thermal conversion efficiency, low water vapor flux and easy wetting of membrane pores in traditional membrane distillation, and improve the porosity, thermal conversion efficiency, and moisture content of ordinary electrospun membranes. Vapor flux, promoting membrane distillation technology to further improve

Method used

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  • Type-C core-shell nanofiber membrane and eccentric-shaft electrostatic spinning preparation method thereof
  • Type-C core-shell nanofiber membrane and eccentric-shaft electrostatic spinning preparation method thereof
  • Type-C core-shell nanofiber membrane and eccentric-shaft electrostatic spinning preparation method thereof

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Embodiment 1

[0027] A method for preparing a C-type core-shell nanofiber membrane by eccentric axis electrospinning, the specific steps are:

[0028] (1) Polystyrene (PS) (Sigma-Aldrich Trading Co., Ltd., weight average molecular weight: 192000g / mol) 25g is dissolved in 75gN, as shell solution in N-dimethylformamide (DMF) solvent, will Polyacrylonitrile (PAN) (Shanghai Jinshan Co., Ltd., weight-average molecular weight: 136000g / mol) 8g is dissolved in 92gN, in the N-dimethylformamide (DMF) solvent as the core layer solution, the shell layer solution and the core layer solution Stir in an oil bath at 40° C. for 24 hours to obtain a uniform and transparent electrospinning solution.

[0029] (2) Add the shell layer electrospinning solution and the core layer electrospinning solution in (1) respectively into the container, and inject it into such as image 3 and Figure 4In the outer needle 1 and inner needle 2 of the eccentric shaft electrospinning needle shown, the extrusion rate is contro...

Embodiment 2

[0035] A method for preparing a C-type core-shell nanofiber membrane by eccentric axis electrospinning, the specific steps are:

[0036] (1) Dissolve 15 g of polyvinylidene fluoride (PVDF) (Solvay Co., Ltd., weight average molecular weight: 573000 g / mol) in 85 g of N, N-dimethylformamide (DMF) as a shell solution, and polypropylene Nitrile (PAN) (Shanghai Jinshan Co., Ltd., weight-average molecular weight: 136000g / mol) 8g is dissolved in 92gN, in N-dimethylformamide (DMF) solvent, as core layer solution, shell layer solution and core layer solution are respectively in Stir in an oil bath at 60° C. for 24 hours at a constant temperature to obtain a uniform and transparent electrospinning solution.

[0037] (2) Add the shell layer electrospinning solution and the core layer electrospinning solution in (1) respectively into the container, and inject it into such as image 3 and Figure 4 In the outer needle 1 and inner needle 2 of the eccentric shaft electrospinning needle show...

Embodiment 3

[0043] A method for preparing a C-type core-shell nanofiber membrane by eccentric axis electrospinning, the specific steps are:

[0044] (1) Dissolve 18 g of polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) (Sigma-Aldrich Trading Co., Ltd., weight average molecular weight: 455000 g / mol) in 82 g of N, N-dimethylformamide (DMF ) as the shell solution, 10 g of polyethersulfone (PES) (Solvay Co., Ltd., weight average molecular weight: 62000 g / mol) was dissolved in 90 g of N, N-dimethylformamide (DMF) solvent as the core layer solution , the shell layer solution and the core layer solution were stirred in an oil bath at 60° C. for 24 hours at a constant temperature to obtain a uniform and transparent electrospinning solution.

[0045] (2) Add the shell layer electrospinning solution and the core layer electrospinning solution in (1) respectively into the container, and inject it into such as image 3 and Figure 4 In the outer needle 1 and inner needle 2 of the ec...

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Abstract

The invention provides a type-C core-shell nanofiber membrane and an eccentric-shaft electrostatic spinning preparation method thereof.The preparation method is characterized by comprising the steps that a hydrophobic polymer is dissolved in a solvent to obtain a shell-layer solution; a hydrophilic polymer is dissolved in a solvent to obtain a core-layer solution, the shell-layer solution and the core-layer solution are respectively injected into an outer needle and an inner needle of an eccentric-shaft electrostatic spinning needle at a certain flowing speed, and meanwhile a high-voltage electrostatic generator is connected with the eccentric-shaft electrostatic spinning needle to perform electrostatic spinning so as to obtain the core-shell nanofiber membrane.The hydrophobic type-C grooved core-shell nanofibers obtained by means of the preparation method and used for membrane distillation can remarkably improve the defects of low membrane porosity, low heat conversion efficiency, low water vapor flux and membrane pore wetting of a traditional distillation membrane based on the particular structural characteristics, the porosity, heat conversion efficiency and water vapor flux of a common electrostatic spinning membrane can be improved, a membrane distillation technology can compete with a reverse osmosis technology in the field of seawater desalination.

Description

technical field [0001] The invention relates to a superhydrophobic C-type core-shell nanofiber porous membrane with a groove structure prepared by eccentric shaft electrospinning for membrane distillation and a preparation method thereof, belonging to the technical field of material engineering. Background technique [0002] Water environmental pollution and water resource shortage are common problems in the world today. Membrane separation technology, as a new type of high-efficiency separation, concentration, purification and purification technology, has been widely used in seawater desalination, industrial wastewater treatment and other fields. Membrane distillation Due to its unique advantages, it has attracted more and more attention and applications. Membrane distillation is a membrane separation process that uses the vapor pressure difference on both sides of a hydrophobic microporous membrane as the driving force for mass transfer [Wu Yonglie, Membrane Distillation T...

Claims

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Application Information

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IPC IPC(8): D04H1/4391D04H1/728D01D5/00B01D67/00B01D69/00
CPCB01D67/0002B01D69/00D01D5/0007D01D5/003D01D5/0069D04H1/4391D04H1/728
Inventor 王雪芬邓莉李雄王敏
Owner DONGHUA UNIV
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