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Nanofiltration membrane material with high surface roughness and preparation method thereof

A technology with roughness and high surface, applied in the field of membrane separation, can solve the problems of low permeation flux and unable to meet production needs, and achieve the effect of strong hydrophilicity, improved retention rate and permeability, and small pore size

Active Publication Date: 2022-03-15
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can increase the permeation flux by 35-50% on the basis of keeping the NaCl removal rate unchanged or even increasing, the overall permeation flux is still low and cannot meet the production demand

Method used

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  • Nanofiltration membrane material with high surface roughness and preparation method thereof
  • Nanofiltration membrane material with high surface roughness and preparation method thereof
  • Nanofiltration membrane material with high surface roughness and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a nanofiltration membrane material with high surface roughness, which is composed of a nanofiber coating film with high surface roughness and a polypiperazine amide nanofiltration separation layer on its surface; The nanofiber coating membrane with surface roughness is composed of a polymer microfiber nonwoven material and a polymer nanofiber coating with high surface roughness coated on its surface, and the nanofiltration separation layer is passed through by the water phase and the oil phase Formed by in-situ interfacial polymerization, the surface layer nanofibers of the polymer nanofiber coating with high surface roughness are wrapped and covered by the polypiperazine amide nanofiltration separation layer.

[0029] The polymer microfiber nonwoven material is a spunbonded nonwoven material of polyester; the polymer nanofiber coating with high surface roughness is a dense coating composed of nanofibers with a diameter variation coefficient of 3...

Embodiment 2-5

[0039] Embodiment 2-5 provides a kind of nanofiltration membrane material of high surface roughness, compared with embodiment 1, difference is: change the diameter variation coefficient of polymer nanofiber in described polymer nanofiber coating, the other It is the same as in Example 1, and will not be repeated here. The specific experimental conditions and measurement results are shown in the table below.

[0040]

[0041] As can be seen from the results in the table above, changing the coefficient of variation of the diameter of the ethylene-vinyl alcohol copolymer nanofibers will affect the surface roughness, porosity and water permeability of the nanofiltration membrane of the polymer nanofiber coating base film. With the increase of the diameter variation coefficient of ethylene-vinyl alcohol copolymer nanofibers, the surface roughness of the nanofiber coating base membrane increases, and at the same time, the nanofiltration The water permeability of the membrane is s...

Embodiment 6～8

[0043] Embodiment 6~8 provide a kind of nanofiltration membrane material of high surface roughness, compared with embodiment 1, difference is: change the nanofiber coating thickness of described high surface roughness, all the other are the same as embodiment 1 Same, no more details here, specific experimental conditions and measurement results are shown in the table below.

[0044]

[0045] As can be seen from the results in the table above, under the condition that the coefficient of variation in diameter is 30%, changing the coating thickness of the polymer nanofiber dispersion on the surface of the nonwoven substrate will affect the surface roughness of the polymer nanofiber coating base film. , porosity, and the water permeability and retention performance of the prepared nanofiltration membrane have a significant impact. With the increase of the coating thickness of the nanofiber dispersion on the surface of the non-woven substrate, the surface of the nanofiber coating...

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Abstract

The invention discloses a nanofiltration membrane material with high surface roughness and a preparation method thereof, which uses wet non-woven technology to prepare a high surface roughness polymer with small pore size, high uniformity, strong hydrophilicity and high density. Nanofiber coating is helpful for the subsequent interfacial polymerization to form a separation layer with small thickness and excellent nanofiltration separation performance, which can significantly improve the rejection rate and permeability; at the same time, nanofibers with large coefficient of variation diameter distribution are used, The formed dense nanofiber coating material is composed of thick fibers and thin fibers, and the thin fibers are flexibly overlapped between the thick fibers to form a significant ups and downs coating surface profile, which is used as the middle layer of the nanofiltration membrane, which helps In order to form an interfacial polymerized separation layer with high surface roughness, it can significantly increase the effective permeable area of ​​the nanofiltration membrane to enhance the permeability of the nanofiltration membrane, providing a new idea for the regulation and control of the surface structure of the nanofiltration membrane, and the preparation of the present invention The process is green and pollution-free, and it is easy to produce on a large scale.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a nanofiltration membrane material with high surface roughness and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of membrane separation technology, between ultrafiltration and reverse osmosis, the nanofiltration process can be carried out at room temperature, no phase change, no chemical reaction, no damage to biological activity, and can effectively intercept divalent and high-valent Ions and organic molecules with a molecular weight higher than 200 allow most monovalent inorganic salts to pass through, so they are widely used in the concentration of various solutions in the fields of seawater desalination, food and beverage, petrochemical, biomedicine, electronic information, environmental protection, etc. and separation and purification process. Although nanofiltration membranes are a promising polymer membran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/44B01D71/56B01D69/02B01D67/00B01D61/00
CPCB01D71/44B01D71/56B01D69/02B01D67/0002B01D67/0006B01D61/027B01D2325/40
Inventor 刘轲王栋刘念程盼郭启浩万雨彩马思琪程芹夏明徐佳
Owner WUHAN TEXTILE UNIV
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