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Method for preparing fiber separation film

A fiber separation and powder technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., to achieve good spinning performance, easy industrial implementation, and good spinnability

Inactive Publication Date: 2010-05-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research found that the alkali treatment method of PVDF has a good effect, but this method uses the PVDF hollow fiber membrane as the base membrane for grafting, and there are defects in the method of grafting and modifying the surface of the base membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Pretreatment of PVDF powder: prepare a sodium hydroxide solution with a molar ratio of 2mol / L, pour 350ml of the alkali solution into a beaker, add 40g of white PVDF powder to the alkali solution, and then add it to the reaction system 5ml of absolute ethanol, stir to make PVDF fully dispersed in the solution. The reaction system was placed in a constant temperature water bath at 50°C and reacted for 10 minutes. The obtained product was suction filtered and washed with distilled water to remove NaF and ethanol in the product. Finally, the powdery solid product obtained after washing was placed in an oven at 60° C. and dried for later use.

[0038] (2) Preparation of temperature-sensitive copolymer: Take 10g of alkali-treated PVDF powder into a three-necked flask, vent nitrogen, and then add 120ml of solvent DMF, and stir to dissolve under heating in a water bath at 50°C. Take 10g of refined NIPAAm and 0.2g of initiator AIBN, add it to a three-necked flask under nitrog...

Embodiment 2

[0043] (1) Pretreatment of PVDF powder: prepare a potassium hydroxide solution with a molar ratio of 2mol / L, pour 350ml of the alkali solution into a beaker, add 60g of white PVDF powder to the alkali solution, and then add it to the reaction system 15ml of absolute ethanol, stir, make PVDF fully dispersed in the solution. The reaction system was placed in a constant temperature water bath at 80°C and reacted for 20 minutes. The obtained product is suction filtered and washed continuously with distilled water to remove KF and ethanol in the product. Finally, the powdery solid product obtained after washing is placed in an oven at 60° C. and dried for later use.

[0044] (2) Preparation of temperature-sensitive copolymer: Take 20g of alkali-treated PVDF powder into a three-necked flask, vent nitrogen, and then add 120ml of solvent DMF, and stir to dissolve under heating in a water bath at 80°C. Take 20g of refined NIPAAm and 0.5g of initiator AIBN, add them to a three-necked flas...

Embodiment 3

[0049] (1) Pretreatment of PVDF powder: prepare a sodium hydroxide solution with a molar ratio of 2mol / L, pour 350ml of the alkali solution into a beaker, add 50g of white PVDF powder to the alkali solution, and then add it to the reaction system 10ml of absolute ethanol, stir to make PVDF fully dispersed in the solution. The reaction system was placed in a constant temperature water bath at 60°C and reacted for 20 minutes. The obtained product was suction filtered and washed with distilled water to remove NaF and ethanol in the product. Finally, the powdery solid product obtained after washing was placed in an oven at 60° C. and dried for later use.

[0050] (2) Preparation of temperature-sensitive copolymer: Take 15g of alkali-treated PVDF powder into a three-necked flask, vent nitrogen, and then add 120ml of solvent DMF, and stir to dissolve under heating in a water bath at 60°C. Take 15g of refined NIPAAm and 0.2g of initiator AIBN, add them to a three-necked flask under nit...

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Abstract

The invention discloses a method for preparing a fiber separation film, and relates to an intelligent separation film, in particular to a method for preparing a temperature responsive separation film. The temperature responsive PVDF hollow fiber separation film is prepared by the following steps of: (1) alkali treatment of PVDF powder; (2) preparation of a temperature-sensitive copolymer, namely performing copolymerization on the PVDF powder after the alkali treatment and a temperature-sensitive monomer NIPAAm to synthesize a PVDF-g-PNIPAAm copolymer; and (3) preparation of a temperature responsive hollow fiber separation film. The method for preparing a film-forming polymer has the characteristics of simple process, low cost, no need of special equipment, easy industrial implementation and the like; and the spinning performance of the copolymer is excellent, and the spinning film-forming process is simple in technology, low in cost and easy for industrial implementation. The intelligent film product is a novel temperature-sensitive PVDF intelligent film which is sensitive to and responds to the change of ambient temperature.

Description

Technical field [0001] The invention relates to an intelligent separation membrane, in particular to a method for preparing a temperature responsive separation membrane. Background technique [0002] Polymer separation membrane has the advantages of high separation efficiency, low energy consumption, simple operation, etc., and has become one of the main methods of separation and purification. However, polymer separation membranes that have been widely used in production and scientific research at present, the pore size or permeability of the membrane cannot respond to changes in ambient temperature. When separating a mixture of multiple components with different molecular weights, it is necessary to use a few with different pore diameters. Seed membranes are separated in batches and fractions. The separation process is complicated and the production cost is high, which limits its application in some fields. Therefore, in recent years, many separation membrane researchers have d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34
Inventor 赵义平陈莉申向冯霞刘晓红
Owner TIANJIN POLYTECHNIC UNIV
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