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A kind of preparation method of dopamine and glucose modified cross-linked polyimide nanofiltration membrane

A polyimide nano-dopamine technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor hydrophilicity, low separation efficiency of organic solvents, and low permeation flux of pure water, etc. problems, to achieve the effect of high permeation flux of pure water, good hydrophilicity and high salt rejection rate

Inactive Publication Date: 2020-04-17
宁波聚仁新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention solves the technical problems of poor hydrophilicity, low pure water permeation flux and low separation efficiency of organic solvents in the preparation of nanofiltration membranes in the prior art, thereby providing a dopamine and glucose modified cross-linked polyimide The preparation method of nanofiltration membrane meets the requirements of actual use

Method used

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  • A kind of preparation method of dopamine and glucose modified cross-linked polyimide nanofiltration membrane
  • A kind of preparation method of dopamine and glucose modified cross-linked polyimide nanofiltration membrane
  • A kind of preparation method of dopamine and glucose modified cross-linked polyimide nanofiltration membrane

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Embodiment 1

[0031] The preparation method of dopamine and glucose modified cross-linked polyimide nanofiltration membrane described in this embodiment comprises the following steps:

[0032] Step (1): Weighing polyimide with a mass fraction of 15%-20%, and configuring a polymer solution;

[0033] Step (2): The polymer solution is prepared by the immersion precipitation phase inversion method, and the prepared membrane is washed with deionized water for 3-6 times to obtain the original polymer membrane;

[0034] Step (3): configuring a diamine alcohol solution with a mass fraction of 0.5-15% hexyl;

[0035] Step (4): placing the polyimide membrane obtained in step 1 in the hexamethylenediamine alcohol solution of step 3 and standing for 1-24h to obtain a cross-linked nanofiltration membrane;

[0036] Step (5): Prepare a dopamine solution with a concentration of 0.05%-1%, and place the cross-linked nanofiltration membrane in step 4 in the dopamine solution for 2 to 12 hours to obtain a dop...

Embodiment 2

[0040] The difference between this embodiment and Example 1 is that the solvent in step (1) is N-methylpyrrolidone, dimethylsulfoxide, dimethylformamide or dimethylacetamide, and the others are the same as Embodiment 1.

Embodiment 3

[0042] The difference between this embodiment and Example 1 or 2 is that the diamine prepared in step (3) is hexamethylenediamine, the alcohol is one or a combination of methanol, ethanol, isopropanol, and n-butanol, and the others are the same as those of the embodiment 1 or 2 are the same.

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Abstract

The invention relates to a preparation method of a dopamine and glucose modified cross-linking polyimide nanofiltration membrane. The method comprises the following steps: 1, preparing a polyimide nanofiltration base membrane; 2, preparing an alkanolamine solution of hexamethylene diamine, and putting the polyimide nanofiltration base membrane into the prepared alkanolamine solution of the hexamethylene diamine for cross-linking modification; 3, immersing cross-linking polyimide into a dopamine buffer solution, and performing coating modification; 4, preparing an acyl chloride solution, and immersing the dopamine-coated membrane into the acyl chloride solution; 5, preparing a glucose solution, and immersing the membrane into the glucose solution, so as to obtain a polyimide composite nanofiltration membrane. The prepared polyimide composite nanofiltration membrane has the advantages of obvious hydrophily increase, large permeation flux, high rejection rate of inorganic salt, high separation efficiency of an organic solvent, and the like.

Description

technical field [0001] The invention relates to a preparation method of a dopamine and glucose modified cross-linked polyimide nanofiltration membrane, belonging to the technical field of membrane preparation methods. Background technique [0002] Nanofiltration membrane refers to a separation membrane with an average diameter of 0.5-2 nm. Since the surface of most nanofiltration membranes is charged, it has a certain selective effect on the permeation of ions. Therefore, nanofiltration membranes are often used to separate small molecular organic compounds with molecular weights between 200 and 1000, and high-priced salt ions. It can be used in sewage treatment, desalination of brackish water, removal of heavy metal ions, food, chemical industry, medicine and other fields. Like reverse osmosis and ultrafiltration, the nanofiltration membrane separation process has no phase change, can be operated at room temperature, has a high degree of automation, and occupies a small are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/64B01D69/12B01D67/00
CPCB01D67/0009B01D67/0093B01D69/125B01D71/64B01D71/82
Inventor 邵路
Owner 宁波聚仁新材料科技有限公司
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