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Method for preparing nanofiber-based composite nanofiltration membrane by low-temperature reverse interfacial polymerization

A composite nanofiltration membrane and nanofiber technology, applied in the field of separation composite membrane preparation, can solve problems such as infiltration and surface defects of polyamide skins, reduce the volatilization rate, solve the problems of surface defects and infiltration, and inhibit rapid volatilization Effect

Inactive Publication Date: 2019-08-16
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing nanofiber-based composite nanofiltration membranes by low-temperature reverse interfacial polymerization for the surface defects and infiltration problems of the polyamide skin layer that occur in the conventional reverse interfacial polymerization process

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  • Method for preparing nanofiber-based composite nanofiltration membrane by low-temperature reverse interfacial polymerization
  • Method for preparing nanofiber-based composite nanofiltration membrane by low-temperature reverse interfacial polymerization

Examples

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Embodiment 1

[0037] This example provides a method for preparing a nanofiber-based composite nanofiltration membrane by low-temperature reverse interfacial polymerization, and the specific steps are:

[0038] (1) Polyacrylonitrile (M w =120,000g / mol) powder was placed in a vacuum oven at 40°C and dried for 48h, then an appropriate amount of polyacrylonitrile powder was taken to prepare polyacrylonitrile (PAN) / N,N-dimethylformamide (PAN) / N,N-dimethylformamide ( DMF) solution, stirred at 40°C for 6h to obtain a transparent and uniform electrospinning solution;

[0039] (2) Add the electrospinning solution in step (1) into the syringe for electrospinning. The electrospinning parameters are as follows: the voltage is 19kV, the inner diameter of the spinneret is 0.2mm, and the solution supply rate is 1mL / h. The ambient temperature of the silk is 25°C, the relative humidity of the air is 35%, the receiving distance is 12cm, and the rotating speed of the receiving drum is 800r / min. After the ele...

Embodiment 2

[0046] This example provides a method for preparing a nanofiber-based composite nanofiltration membrane by low-temperature reverse interfacial polymerization, and the specific steps are:

[0047] (1) Polyacrylonitrile (M w =120,000g / mol) powder was placed in a vacuum oven at 40°C and dried for 48h, then an appropriate amount of polyacrylonitrile powder was taken to prepare polyacrylonitrile (PAN) / N,N-dimethylformamide (PAN) / N,N-dimethylformamide ( DMF) solution, stirred at 40°C for 6h to obtain a transparent and uniform electrospinning solution;

[0048] (2) Add the electrospinning solution in step (1) into the syringe for electrospinning. The electrospinning parameters are as follows: the voltage is 19kV, the inner diameter of the spinneret is 0.2mm, and the solution supply rate is 1mL / h. The ambient temperature of the silk is 25°C, the relative humidity of the air is 35%, the receiving distance is 12cm, and the rotating speed of the receiving drum is 300r / min. After the ele...

Embodiment 3

[0055] This example provides a method for preparing a nanofiber-based composite nanofiltration membrane by low-temperature reverse interfacial polymerization, and the specific steps are:

[0056] (1) Polyacrylonitrile (M w =120,000g / mol) powder was placed in a vacuum oven at 40°C and dried for 48h, then an appropriate amount of polyacrylonitrile powder was taken to prepare polyacrylonitrile (PAN) / N,N-dimethylformamide (PAN) / N,N-dimethylformamide ( DMF) solution, stirred at 40°C for 6h to obtain a transparent and uniform electrospinning solution;

[0057] (2) Add the electrospinning solution in step (1) into the syringe for electrospinning. The electrospinning parameters are as follows: the voltage is 19kV, the inner diameter of the spinneret is 0.2mm, and the solution supply rate is 1mL / h. The ambient temperature of the silk is 25°C, the relative humidity of the air is 35%, the receiving distance is 12cm, and the rotating speed of the receiving drum is 300r / min. After the ele...

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Abstract

The invention discloses a method for preparing a nanofiber-based composite nanofiltration membrane by low-temperature reverse interfacial polymerization. The method comprises the following steps: electrospinning a polymer solution to obtain a nanofiber nonwoven fabric, and performing cold pressing treatment to obtain a nanofiber porous base film; adding the nanofiber porous base film to a low-temperature oil phase monomer solution in order to infiltrate the surface of the base film; adding the infiltrated base film to an aqueous phase monomer solution, and carrying out a reverse interfacial polymerization; and carrying out heat treatment to obtain the nanofiber-based composite nanofiltration membrane. The temperature of the oil phase solution is controlled to reduce the volatilization rateof the oil phase at a low temperature, provide a complete and uniform reaction interface for the reverse interfacial polymerization and overcomes the skin layer defect and infiltration due to fast volatilization of the oil phase during the reverse interfacial polymerization, and the temperature of the oil phase solution and the reverse interface polymerization parameters are controlled to optimize the thickness, uniformity and density of a functional barrier layer in order to enhance the nanofiltration performance of the composite membrane.

Description

technical field [0001] The invention belongs to the field of preparation of separation composite membranes, in particular to a new method for preparation of nanofiber-based composite nanofiltration membranes for desalination. Background technique [0002] Since the 20th century, the shortage of fresh water resources has become a major problem that must be solved in the world today. In order to treat the domestic sewage and wastewater generated after use, so that they can meet the basic discharge standards or be recycled, a series of water treatment technologies have been developed. Among them, membrane separation technology has attracted people's attention because of its high separation efficiency, wide application range and low energy consumption. Nanofiltration is a special separation membrane technology developed in the field of seawater desalination and sewage treatment in recent decades. [0003] The nanofiltration separation process is generally considered as "low-pr...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/16B01D71/26B01D71/28B01D71/30B01D71/34B01D71/38B01D71/42B01D71/68B01D71/76C02F1/44C02F103/08
CPCB01D61/027B01D67/0006B01D69/12B01D71/16B01D71/26B01D71/28B01D71/30B01D71/34B01D71/38B01D71/42B01D71/68B01D71/76C02F1/442C02F2103/08
Inventor 王雪芬沈克李霈云张同辉
Owner DONGHUA UNIV
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