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Low-pressure high-flux hydrophilic ultrafiltration membrane and preparation method thereof

A hydrophilic, low-pressure and high-pressure technology, applied in the field of membrane separation, can solve problems such as limitations, achieve the effects of reducing application costs, high-purity water flux, and promoting development

Inactive Publication Date: 2020-06-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By in-situ synthesis of polyamic acid in the base membrane material, the compatibility and dispersion of the polymer in the casting solution have been solved to a large extent. In the preparation of ultrafiltration membranes by common blending methods, direct addition is often used The method of adding hydrophilic materials to the casting solution, which limits the amount of additives in the casting solution

Method used

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  • Low-pressure high-flux hydrophilic ultrafiltration membrane and preparation method thereof
  • Low-pressure high-flux hydrophilic ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0024] Hydrophilicity and bovine serum albumin (BSA) cut-off performance test of modified membrane

[0025] At 80°C, 15 parts by mass of polyethersulfone was dissolved in N,N-dimethylformamide (DMF) with mechanical stirring, and after obtaining the preliminary casting solution, cooled to room temperature, and then added by mass parts of 0 to 1.0 parts of monomer 4,4'-diaminodiphenylsulfone (DDS), and continue stirring with a stirrer to dissolve and mix evenly, then add the corresponding parts by mass of DDS (molar ratio is 1:1.02) Monomer pyromellitic dianhydride (PMDA), continue to use a stirrer to stir for 4h to make the two monomers react to obtain a mixed solution, then leave it to stand for degassing for 12h under a vacuum of 0.05MPa, and finally obtain a clear and transparent solution; The clear and transparent solution was placed on a glass plate to scrape the membrane, and then placed in deionized water at 20°C for coagulation to obtain an ultrafiltration membrane.

...

Embodiment 6-10

[0030] Pure water low pressure high flux test of modified membrane

[0031] As in the above example, at 80°C, 15 parts by mass of polyethersulfone was dissolved in N,N-dimethylformamide (DMF) with mechanical stirring, and after obtaining the preliminary casting solution, cooled to room temperature, Then add 0.8 parts by mass of monomer 4,4'-diaminodiphenylsulfone (DDS), and continue stirring with a stirrer to dissolve and mix evenly, then add the corresponding DDS (molar ratio is 1:1.02) The mass parts of the monomer pyromellitic dianhydride (PMDA), continue to use the stirrer to stir for 4h to make the two monomers react to obtain a mixed solution, and then stand for defoaming for 12h under a vacuum of 0.05MPa, and finally obtain a clear and transparent solution; the clear and transparent solution was placed on a glass plate to scrape the film, and then placed in deionized water at 20°C for coagulation to obtain an ultrafiltration membrane.

[0032] Under the operating press...

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Abstract

The invention discloses a low-pressure high-flux hydrophilic ultrafiltration membrane and a preparation method thereof. The low-pressure high-flux hydrophilic ultrafiltration membrane comprises a basemembrane material, an organic solvent, a monomer A and a monomer B; and the method comprises the following steps: dissolving the base membrane material in an organic solvent, mechanically heating andstirring, and fully and uniformly mixing to obtain a primary membrane casting solution; adding the monomer A into the preliminary membrane casting solution, then carrying out mechanical stirring to fully and uniformly mix, then adding the monomer B, carrying out mechanical stirring to enable the monomer A and the monomer B to react in the preliminary membrane casting solution, then performing standing in vacuum to be defoamed to obtain a clear and transparent solution, and then putting the clear and transparent solution on a glass plate or non-woven fabric to carry out membrane scraping. Themonomer A and the monomer B are subjected to condensation polymerization in the preliminary membrane casting solution to generate gel-state polyamic acid, and the ultrafiltration membrane is preparedthrough membrane scraping and has good hydrophilicity, temperature resistance and toughness, the membrane performance is stable, and hydrophilic substances are not prone to loss.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a low-pressure, high-flux hydrophilic ultrafiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a new technology that appeared in the early 20th century and rose rapidly after the 1960s. As a new and very promising industrial process, it has good selectivity, simple equipment, low energy consumption, high efficiency and flexibility. , easy to operate, low investment and many other advantages, it can replace some disadvantages of traditional separation technology in competition. As a kind of membrane separation technology, ultrafiltration is driven by the pressure difference on both sides of the membrane. As a filter medium, ultrafiltration membrane can selectively intercept macromolecules larger than the micropores on the membrane surface under a certain pressure. Substances allow small molecular substanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D69/02B01D67/00
CPCB01D67/0006B01D67/0011B01D69/02B01D71/64B01D2325/36
Inventor 周勇王开珍高从堦
Owner ZHEJIANG UNIV OF TECH
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