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High permeability and antifouling nanofiber separation membrane material, preparation method and application thereof

A nanofiber, high-permeability technology, applied in the field of membrane separation, can solve the problems of easy detachment of polyethersulfone selective layer, low uniformity of membrane pores, and reduced filtration efficiency, and achieves strong design and operability, The effect of improving permeability and stain resistance and prolonging service life

Active Publication Date: 2022-08-02
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its disadvantage is that the templating treatment will change the pore structure of the membrane surface, resulting in low uniformity of membrane pores, resulting in a series of problems such as reduced filtration efficiency, reduced flux, and clogged membrane pores, and the polyethersulfone selective layer is easy to Falling off, easy to cause secondary pollution

Method used

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  • High permeability and antifouling nanofiber separation membrane material, preparation method and application thereof
  • High permeability and antifouling nanofiber separation membrane material, preparation method and application thereof
  • High permeability and antifouling nanofiber separation membrane material, preparation method and application thereof

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preparation example Construction

[0036] The invention also provides a preparation method of a high-permeability anti-fouling nanofiber separation membrane material, comprising the following steps:

[0037] S1, disperse the polymer nanofibers in a mixed solvent of an organic solvent and deionized water, then add a predetermined amount of a chemical crosslinking agent, stir to obtain a nanofiber suspension, and seal it for later use;

[0038] S2. Using wet non-woven technology, the nanofiber suspension obtained in step S1 is coated on the surface of the fabric substrate, and after drying at room temperature, a high-permeability and antifouling nanofiber separation membrane material is obtained.

[0039] In step S1, in the mixed solvent, the mass ratio of the organic solvent to deionized water is 1:1; the organic solvent is one of ethanol, acetic acid, isopropanol, acetone, and dimethylformamide. The added amount of the chemical crosslinking agent accounts for 0.1-3.0 wt% of the mass of the polymer nanofibers, a...

Embodiment 1

[0044] This embodiment provides a high-permeability anti-fouling nanofiber separation membrane material and a preparation method thereof.

[0045] The separation membrane material includes a fabric substrate and a polymer nanofiber coating supported on the surface of the fabric substrate, and the fabric substrate and the polymer nanofiber coating are closely bonded by a chemical crosslinking agent. Wherein, the fabric substrate is a woven fabric with a surface periodic texture structure, and the polymer nanofiber coating is prepared by a wet non-woven process and has the same surface periodic texture structure as the fabric substrate.

[0046] Specifically, the preparation method of the separation membrane material comprises the following steps:

[0047] S1. Disperse the ethylene vinyl alcohol copolymer nanofibers prepared by the electrospinning method in a mixed solvent with a mass ratio of ethanol and deionized water of 1:1, and then add a chemical crosslinking agent pentyle...

Embodiment 2～7

[0053] Embodiments 2 to 7 respectively provide a method for preparing a high-permeability anti-fouling nanofiber separation membrane material. Compared with Embodiment 1, the difference is that the types and process parameters of the raw materials used in step S1 are changed. The types of raw materials and the corresponding process parameters are shown in Table 1, and the remaining parameters are all consistent with those in Example 1, and will not be repeated here.

[0054] Process conditions in step S1 of Table 1 Examples 2-7

[0055]

[0056] The pore size distribution of the high-permeability and antifouling nanofiber separation membranes prepared in the above examples 1 to 7 was measured at a temperature of 25 °C, and the filtration polystyrene microspheres were measured at a pressure of 0.2 MPa and a temperature of 25 °C. (1g / L) The pure water flux before and after the solution, the specific test method is to first test in pure water for 3h, then replace it with 1g / L ...

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Abstract

The invention provides a high-permeability anti-fouling nanofiber separation membrane material and a preparation method and application thereof. The preparation method uses a woven fabric with periodic texture on the surface as a base material, uses a wet non-woven technology to load a hydrophilic polymer nanofiber coating on the surface of the woven fabric, and uses a chemical cross-linking agent to make the woven fabric The fabric is closely attached to the polymer nanofiber coating to obtain a high permeability and antifouling nanofiber separation membrane material. Through the above method, the present invention enables the prepared separation membrane material to have a small pore size dense structure and a surface texture structure at the same time, so as to achieve synergistic improvement of the permeability and antifouling properties of the membrane material. In addition, the preparation method of the separation membrane material is simple and easy to operate, has strong controllability, can improve the preparation efficiency, and is easy to prepare on a large scale. High practical application value.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a high-permeability antifouling nanofiber separation membrane material and a preparation method and application thereof. Background technique [0002] Compared with traditional separation technologies such as distillation, absorption, extraction, and cryogenic separation, membrane separation has the characteristics of simple operation, good stability, high efficiency and low energy consumption. important role. Ultrafiltration and high-precision microfiltration membrane separation can achieve efficient separation of submicron particles, microbial cells, colloids and proteins. However, due to the limitation of the physical and chemical structure on the surface of membrane materials, the liquid permeability is usually not high enough to achieve high-efficiency separation, and there is a problem of membrane fouling, which leads to a rapid decrease in permeability, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02
CPCB01D67/0006B01D69/02B01D2325/40
Inventor 王栋刘轲程盼马思琪刘念胡威郭启浩程芹
Owner WUHAN TEXTILE UNIV
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