Method for preparing nano filter membrane using surface crafting technology

A technology of surface grafting and nanofiltration membranes, applied in the field of preparation of hydrophilic nanofiltration membranes, can solve the problems of poor permeability, poor hydrophilicity and limitations of nanofiltration membranes

Inactive Publication Date: 2005-03-02
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the interfacial polycondensation method has strict requirements on the composition of the monomers, the technical difficulty of the polymerization reaction is high, and the product quality is not easy to control; while the permeability of the nanofiltration membrane prepared by the phase transition method is often poor
In addition, the membranes made by these methods have poor hydrophilicity, which greatly limits the application of membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The ultrafiltration membrane used in this example is prepared by a phase inversion method using polyether ketone resin (PEK-C) containing phenolphthalein group, and the molecular weight cut off of the membrane is 10,000.

[0021] Surface graft polymerization was carried out in a tetrafluoroethylene circular reactor with a diameter of 5 cm. The top of the reactor is fitted with a quartz glass cover. Install the ultrafiltration membrane in the reactor with the membrane face up, and then add the monomer solution at a height of about 5 mm on the surface of the membrane. The reactor is placed directly under the straight ultraviolet lamp source, and the power of the ultraviolet lamp is 300W. The distance between the reactor and the ultraviolet light source is 5 cm.

[0022] The monomer solution used in this embodiment is an aqueous solution of acrylic acid (AA) with a concentration of 10% (by weight). The irradiation time is 1 min. After the irradiation, the modified memb...

Embodiment 2

[0024] According to the conditions of Example 1, a PEK-C ultrafiltration membrane with a molecular weight cut-off of 70,000 was used. The irradiation distance is 7cm, and the irradiation time is 10min.

[0025] The obtained AA modified PEK-C nanofiltration membrane has a water flux of 2.8kg / m at 0.8MPa 2 h, for 1% NaCl and Na 2 SO 4 The water flux of the solution is 2.72kg / m 2 h and 2.53kg / m 2 h, the rejection rates of the above two salts were 55% and 94.2%, respectively.

Embodiment 3

[0027] According to the conditions of Example 1, a PEK-C ultrafiltration membrane with a molecular weight cut-off of 30,000 was used. The UV lamp power is 500W. The irradiation distance is 7cm. The monomer solution is 10% (weight) AA aqueous solution, and the irradiation time is 5 minutes.

[0028] The obtained AA modified PEKC nanofiltration membrane has a water flux of 10.8kg / m at 0.8MPa 2 h, for 1% NaCl and Na 2 SO 4 The water flux of the solution is 8.72kg / m 2 h and 8.13kg / m 2 h, the rejection rates of the above two salts were 56% and 96.2%, respectively.

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Abstract

The present invention relates to surface grafting process of preparing hydrophilic nanofiltering film. The surface grafting process is one radiation grafting process, which is low temperature plasma radiation process, ultraviolet radiation process, high energy ray radiation process, etc. The present invention has simple operation, controllable reaction, regulation of separating membrane performance in great range and other features, and is especially suitable for the preparation of hydrophilic nanofiltering film.

Description

technical field [0001] The invention relates to a method for preparing hydrophilic nanofiltration membrane by surface grafting technology. It has the characteristics of simple operation, high grafting efficiency, and the performance of the membrane can be adjusted in a wide range, and is especially suitable for the preparation of hydrophilic nanofiltration membranes. Background technique [0002] Nanofiltration membrane is a separation membrane driven by pressure. It has the advantages of low operating pressure and large permeation flux. It has been widely used in water treatment and separation of compounds with relatively small molecular weight. separation technology. [0003] At present, the methods for producing nanofiltration membranes in industry mainly include interfacial polycondensation method and phase transition method. Although these methods have been widely used, there are still some shortcomings. For example, the method of interfacial polycondensation has str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78
Inventor 平郑骅邱长泉
Owner FUDAN UNIV
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