High-permeability anti-fouling nanofiber separation membrane material and preparation method and application thereof

A nanofiber and high-permeability technology, applied in the field of membrane separation, can solve the problems of polyethersulfone selective layer falling off easily, low membrane pore uniformity, and reduced filtration efficiency, achieving strong design and operability, Improves permeability and stain resistance, and prolongs service life

Active Publication Date: 2021-07-23
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 anti-fouling nanofiber separation membrane material and preparation method and application thereof
  • High-permeability anti-fouling nanofiber separation membrane material and preparation method and application thereof
  • High-permeability anti-fouling nanofiber separation membrane material and preparation method and application thereof

Examples

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preparation example Construction

[0036] The present invention also provides a preparation method of a high-permeability antifouling 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 evenly to obtain a nanofiber suspension, and keep it sealed for later use;

[0038] S2. Applying the nanofiber suspension obtained in step S1 to the surface of the fabric substrate by wet non-woven technology, and drying at room temperature to obtain a highly permeable antifouling nanofiber separation membrane material.

[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 addition amount of the chemical crosslinking agent accounts for 0.1-3.0 wt% of the mass of the polymer nanofiber...

Embodiment 1

[0044] This example provides a high-permeability antifouling nanofiber separation membrane material and its preparation method.

[0045] The separation membrane material comprises a fabric base material and a polymer nanofiber coating loaded on the surface of the fabric base material, and the fabric base material 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 ammoni...

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 Example 1, the difference is that the types of raw materials and process parameters used in step S1 are changed. Specifically The types of raw materials and corresponding process parameters are shown in Table 1, and the rest of the parameters are consistent with those in Example 1, and will not be repeated here.

[0054] Table 1 embodiment 2~7 in the process condition in step S1

[0055]

[0056] The high-permeability anti-fouling nanofiber separation membrane prepared in the above examples 1-7 was measured at a temperature of 25°C to measure its pore size distribution, and at a pressure of 0.2MPa and a temperature of 25°C to measure its filter polystyrene microspheres (1g / L) pure water flux before and after the solution, the specific test method is to test under pure water for 3 hours, then replace it with 1g / L polysty...

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Abstract

The invention provides a high-permeability anti-fouling nanofiber separation membrane material and a preparation method and application thereof. According to the preparation method, a woven fabric with periodic textures on the surface serves as a base material, a hydrophilic polymer nanofiber coating is loaded on the surface of the woven fabric through a wet non-woven technology, meanwhile the woven fabric and the polymer nanofiber coating are tightly attached through a chemical cross-linking agent, and the high-permeability anti-fouling nanofiber separation membrane material is obtained. Through the mode, the prepared separation membrane material has a small-aperture compact structure and a surface texture structure at the same time, and the permeability and the pollution resistance of the membrane material are synergistically improved. The preparation method of the separation membrane material is simple, convenient and easy to implement, the controllability is high, the preparation efficiency can be improved, large-scale preparation is easy, and the prepared separation membrane material can be applied to the field of ultrafiltration and microfiltration of tangential flow liquid and has 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 its preparation method and application. 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. It plays an important role in the fields of biomedicine, petrochemical, energy environment, and electronic manufacturing 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 of the surface of the membrane material, while achieving high-efficiency separation, the liquid permeability is...

Claims

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Application Information

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Patent Type & Authority Applications(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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