Polyacrylonitrile ultrafiltration membrane surface hydrolysis method

A polyacrylonitrile, ultrafiltration membrane technology, applied in the field of membrane separation, to achieve the effect of improving anti-pollution and biocompatibility

Inactive Publication Date: 2009-08-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is of great significance to develop a method for surface hydrolysis

Method used

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  • Polyacrylonitrile ultrafiltration membrane surface hydrolysis method

Examples

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Effect test

Embodiment 1

[0019] 1) The dry / wet phase inversion method is used to prepare a flat polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of about 100,000 Daltons;

[0020] 2) soak the flat polyacrylonitrile ultrafiltration membrane in ethanol / water solution with ethanol mass content of 25wt%, 50wt%, 75wt% and 100wt% respectively for 120 minutes step by step, so that the water in the membrane pores is completely replaced by ethanol;

[0021] 3) Take the membrane out of absolute ethanol, soak it step by step in cyclohexane / ethanol solutions with cyclohexane mass content of 25wt%, 50wt%, 75wt% and 100wt% for 120 minutes, so that the ethanol in the membrane pores is completely replaced by cyclohexane;

[0022] 4) Take the membrane out of the cyclohexane, place it in a flat-plate polyacrylonitrile ultrafiltration membrane surface hydrolysis device, inject a NaOH solution with a temperature of 60 ° C and a concentration of 2 mol / l into the hydrolysis device, and make one si...

Embodiment 2

[0029] 1) Prepare a flat polyacrylonitrile ultrafiltration membrane by dry / wet phase inversion method, with a molecular weight cut-off of about 10,000 Daltons;

[0030] 2) soak the flat polyacrylonitrile ultrafiltration membrane in ethanol / water solution with ethanol mass content of 25wt%, 50wt%, 75wt% and 100wt% respectively for 120 minutes step by step, so that the water in the membrane pores is completely replaced by ethanol;

[0031] 3) Take the membrane out of absolute ethanol, soak it step by step in cyclohexane / ethanol solutions with cyclohexane mass content of 25wt%, 50wt%, 75wt% and 100wt% for 120 minutes, so that the ethanol in the membrane pores is completely replaced by cyclohexane;

[0032] 4) Take the membrane out of the cyclohexane, place it in a flat-plate polyacrylonitrile ultrafiltration membrane surface hydrolysis device, inject a NaOH solution with a temperature of 80 ° C and a concentration of 1 mol / l into the hydrolysis device, and make one side of the me...

Embodiment 3

[0039] 1) The polyacrylonitrile hollow fiber ultrafiltration membrane is spun by the dry / wet phase inversion method, with an inner diameter of 1.1 mm and a molecular weight cut-off of about 60,000 Daltons. The hollow fiber membrane is placed in a PVC pipe, and both ends are sealed with epoxy resin. End, made of hollow fiber membrane module;

[0040] 2) soak the hollow fiber polyacrylonitrile ultrafiltration membrane module in ethanol / water solution with ethanol mass content of 25wt%, 50wt%, 75wt% and 100wt% respectively for 60 minutes, so that the water in the membrane pores is completely replaced by ethanol ;

[0041]2) Take the membrane assembly out of absolute ethanol, soak it step by step in cyclohexane / ethanol solutions with a mass content of 25wt%, 50wt%, 75wt% and 100wt% of cyclohexane for 60 minutes, so that the ethanol in the membrane pores completely replaced by cyclohexane;

[0042] 3) The membrane assembly is taken out from the cyclohexane and placed in figure 1...

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Abstract

The invention relates to a method for hydrolyzing the surface of a polyacrylonitrile ultrafiltration membrane, and belongs to the technical field of membrane separation. The prior soakage method is easy to make the inner surface and the outer surface of the membrane and the insides of membrane pores all perform hydrolysis reaction, so that the mechanical strength and the flux of the membrane are severely reduced. The invention realizes the surface hydrolysis of the polyacrylonitrile ultrafiltration membrane by adopting the following technical proposal: filling a transitional solvent-ethanol into the membrane pores; using a filling solvent-cyclohexane to substitute the ethanol; making a single surface of the membrane contact an alkaline solution for hydrolysis; using the ethanol to substitute the cyclohexane in the membrane pores; and using water to substitute the ethanol in the membrane pores. When the method is adopted to modify the polyacrylonitrile ultrafiltration membrane, the hydrolysis reaction is only performed on the surface of the membrane and not performed in the membrane pores, so that the method improves the pollution resistance and the biocompatibility of the polyacrylonitrile ultrafiltration membrane and simultaneously guarantees the mechanical strength and the flux of the membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for hydrolyzing the surface of a polyacrylonitrile ultrafiltration membrane. Background technique [0002] Polyacrylonitrile ultrafiltration membrane is an important type of membrane material due to its strong heat resistance and solvent resistance, but its hydrophilicity and biocompatibility limit its application to a certain extent. Further modification is carried out to improve its antifouling and biocompatibility. Another important application direction of polyacrylonitrile ultrafiltration membrane is used as a base membrane material for the preparation of composite membranes. In this application direction, it is also necessary to modify and charge the polyacrylonitrile ultrafiltration membrane to ensure the subsequent composite reaction or electrostatic deposition. Existing methods for modifying polyacrylonitrile membranes include: plasma t...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D71/82B01D69/06B01D69/08
Inventor 张国俊纪树兰宋雪李杰刘忠洲
Owner BEIJING UNIV OF TECH
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