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Preparation method of superhydrophobic and double-sided hydrophilic electrospun nanofiber composite membrane

A nanofiber and electrospinning technology is applied in the field of preparation of super-hydrophobic and double-sided hydrophilic electrospinning nanofiber composite membranes, which can solve the problems of membrane wetting and pollution, improve the service life of membranes, reduce membrane pollution, The effect of improving the service life

Active Publication Date: 2021-08-06
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a method for preparing a superhydrophobic and double-sided hydrophilic electrospun nanofiber composite membrane, which solves the problems of membrane wetting and contamination in the existing membrane distillation technology. Simple and effective, it can be widely used in separation and concentration processes in the fields of biology, medicine, electronics and food

Method used

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  • Preparation method of superhydrophobic and double-sided hydrophilic electrospun nanofiber composite membrane
  • Preparation method of superhydrophobic and double-sided hydrophilic electrospun nanofiber composite membrane
  • Preparation method of superhydrophobic and double-sided hydrophilic electrospun nanofiber composite membrane

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Embodiment 1

[0028] This embodiment includes the following steps:

[0029] 1. Weigh 1.6g of PVDF, N,N-dimethylacetamide, and acetone in a three-necked round-bottomed flask, and mechanically stir in a water bath at 50°C for 12 hours until the solid powder is completely dissolved to prepare an electrospinning solution; then The spinning solution was defoamed at 50°C for 2 hours.

[0030] 2. Pour the above spinning liquid into a 10mL syringe in the electrospinning equipment (purchased from Beijing Yongkang Leye Technology Development Co., Ltd.), electrospun the nanofiber membrane with aluminum foil as the receiving substrate, and placed the membrane on the Volatilize the solvent in an oven, wherein: the electrospinning parameters are: spinning solution temperature 25°C, air humidity 60%, spinning solution injection rate 0.08mm / min, spinning positive voltage 16kV, negative voltage -1kV, The distance from the syringe needle to the receiving drum was 15 cm, and the rotating speed of the drum wa...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] 1. Weigh 1.6g of PVDF, N,N-dimethylacetamide, and acetone in a three-necked round-bottomed flask, and mechanically stir in a water bath at 50°C for 12 hours until the solid powder is completely dissolved to prepare an electrospinning solution; then The spinning solution was defoamed at 50°C for 2 hours.

[0034] 2. Pour the above spinning liquid into a 10mL syringe in the electrospinning equipment (purchased from Beijing Yongkang Leye Technology Development Co., Ltd.), electrospun the nanofiber membrane with aluminum foil as the receiving substrate, and placed the membrane on the Volatilize the solvent in an oven, wherein: the electrospinning parameters are: spinning solution temperature 25°C, air humidity 60%, spinning solution injection rate 0.08mm / min, spinning positive voltage 16kV, negative voltage -1kV, The distance from the syringe needle to the receiving drum was 15 cm, and the rotating speed of the drum wa...

Embodiment 3

[0037] This embodiment includes the following steps:

[0038] 1. Weigh 1.6g of PVDF, N,N-dimethylacetamide, and acetone in a three-necked round-bottomed flask, and mechanically stir in a water bath at 50°C for 12 hours until the solid powder is completely dissolved to prepare an electrospinning solution; then The spinning solution was defoamed at 50°C for 2 hours.

[0039] 2. Pour the above spinning solution into a 10mL syringe in the electrospinning equipment (purchased from Beijing Yongkang Leye Technology Development Co., Ltd.), and electrospun the nanofiber membrane with aluminum foil as the receiving substrate. The solvent was volatilized in an oven, wherein: the electrospinning parameters were: spinning solution temperature 25°C, air humidity 60%, spinning solution injection rate 0.08mm / min, spinning positive voltage 16kV, negative voltage -1kV, The distance from the syringe needle to the receiving drum was 15 cm, and the rotating speed of the drum was 100 rpm.

[0040...

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Abstract

A nanofiber composite membrane, including a mussel biomimetic polymer as the surface hydrophilic layer and a superhydrophobic layer in the form of polymer fibers inside it, the composite membrane is modified by superhydrophobic modification of the electrospun body , and then carry out hydrophilic modification treatment on the upper and lower surfaces; the main body of electrospinning is prepared by hydrophobic polymer; superhydrophobic modification treatment refers to: soak the membrane made by electrospinning in a solution containing superhydrophobic modifier Middle; the hydrophilic modification treatment refers to: the upper and lower surfaces of the electrospinning body after the superhydrophobic modification treatment are coated with a mussel biomimetic polymer hydrophilic modifier, and the present invention solves the problems in the existing membrane distillation technology. The problem of wetting and fouling of the membrane, the process is simple and the effect is remarkable, and can be widely used in the separation and concentration process in the fields of biology, medical treatment, electronics and food.

Description

technical field [0001] The invention relates to a high-voltage electrospinning technology and a technology in the field of membrane distillation, in particular to a method for preparing a superhydrophobic and double-sided hydrophilic electrospinning nanofiber composite membrane. Background technique [0002] At present, polymer materials commonly used to prepare hydrophobic membranes include polytetrafluoroethylene (PTFE), polypropylene (PP), polyethylene (PE) and polyvinylidene fluoride (PVDF). Superhydrophobic means that the contact angle of the surface to water is greater than 150°. Usually, chemical methods can be used to reduce the free energy of the solid surface to obtain a superhydrophobic surface. Since most of the sewage treated by membrane distillation contains interface active substances, these organic substances are easy to deposit on the surface of the hydrophobic membrane, causing membrane fouling, which will not only reduce the membrane flux but also reduce t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/36B01D67/00B01D69/02B01D69/12B01D71/26B01D71/34B01D71/36D04H1/4291D04H1/4318D04H1/4382D04H1/728
CPCB01D61/364B01D67/0002B01D69/02B01D69/12B01D71/26B01D71/34B01D71/36B01D2323/39B01D2325/36D04H1/4291D04H1/4318D04H1/4382D04H1/728
Inventor 邵嘉慧李隽任龙飞涂永辉马忠宝
Owner SHANGHAI JIAOTONG UNIV
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