Preparation method of super-hydrophobic and bilateral hydrophilic static spinning nano fiber composite membrane

Abstract

The invention provides a nano fiber composite membrane. The nano fiber composite membrane comprises a mussel bionic polymer serving as a surface hydrophilic layer and a super-hydrophobic layer locatedin the polymer and in the form of polymer fiber. The composite membrane is obtained by conducting super-hydrophobic modifying treatment on the static spinning main body and conducting hydrophilic modifying treatment on the upper surface and the lower surface. The static spinning main body is obtained by adopting a hydrophobic polymer. Super-hydrophobic modifying treatment comprises the steps thatthe membrane prepared through static spinning is dipped into a solution containing a super-hydrophobic modifier. Hydrophilic modifying treatment comprises the steps that the upper surface and the lower surface of the static spinning main body subjected to super-hydrophobic modifying treatment is coated with the mussel bionic polymer hydrophilic modifier. The preparation method solves the problemof wetting and pollution of the membrane in the prior art of membrane distillation, the process is simple, the effect is outstanding, and the membrane can be widely applied to separation and concentration process in the field ofincluding 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...

Examples

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...

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...

Examples

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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