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Flat separation membrane

A separation membrane, flat plate technology, applied in the direction of semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., to achieve the effect of simple method, easy industrial implementation, and obvious temperature response characteristics

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

[0034] Embodiment 1: the preparation of flat film product

[0035] (1) Alkali treatment of PVDF powder: Prepare a sodium hydroxide solution with a molar ratio of 2mol / L, pour 350ml of the lye into a beaker, add 40g of white PVDF powder into the alkali solution, and then add 5ml of absolute ethanol, stirring 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. Suction filter the obtained product, and wash it continuously with distilled water to remove NaF and ethanol in the product, and finally put the powdery solid product PVDF obtained after washing into an oven at 60°C to dry for use.

[0036] (2) Preparation of temperature-sensitive copolymer: Take 10 g of alkali-treated PVDF powder and put it into a three-necked flask, pass nitrogen gas, then add 120 ml of solvent DMF, stir and dissolve in a water bath at 50° C. under heating conditions. Take 10g of refined NIPAAm and 0.2g of...

Embodiment 2

[0040] Embodiment 2: the preparation of flat film product

[0041] (1) Alkali treatment of PVDF powder: Prepare a potassium hydroxide solution with a molar ratio of 2mol / L, pour 350ml of the lye into a beaker, add 60g of white PVDF powder into the alkali solution, and then add 15ml of absolute ethanol, stirring to 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 was suction-filtered and washed continuously with distilled water to remove KF and ethanol in the product, and finally the powdery solid product obtained after washing was placed in an oven at 60°C for drying for use.

[0042] (2) Preparation of temperature-sensitive copolymer: Take 20 g of alkali-treated PVDF powder and put it into a three-necked flask, pass nitrogen gas, then add 120 ml of solvent DMF, stir and dissolve in a water bath at 80° C. under heating conditions. Take 20g of refined NIPAAm ...

Embodiment 3

[0047] (1) Alkali treatment of PVDF powder: Prepare a sodium hydroxide solution with a molar ratio of 2mol / L, pour 350ml of the lye into a beaker, add 50g of white PVDF powder into the alkali solution, and then add it to the reaction system Add 10ml of absolute ethanol and stir to fully disperse PVDF 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 continuously with distilled water to remove NaF and ethanol in the product, and finally the powdery solid product obtained after washing was put into an oven at 60°C to dry for use.

[0048] (2) Preparation of temperature-sensitive copolymer: Take 15 g of alkali-treated PVDF powder into a three-necked flask, pass nitrogen gas, then add 120 ml of solvent DMF, stir and dissolve in a 60° C. water bath under heating conditions. Take 15g of refined NIPAAm and 0.2g of initiator AIBN, and add them into a three-necke...

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Abstract

The invention discloses a flat separation membrane, belongs to the field of membrane technology and particularly relates to intelligent polymeric flat separation membrane technology. The invention adopts a technical scheme comprising: 1, carrying out alkali treatment to PVDF powder; 2, preparing temperature sensitive copolymer, copolymerizing the PVDF powder after alkali treatment and temperature sensitive monomer NIPAAm, and synthesizing PVDF-g-PNIPAAm copolymer; and 3, preparing the temperature response type PVDF flat separation membrane by a phase inversion method. A preparation method of membrane forming polymer has the characteristics of simple process, low cost, having no use for special equipment, easy industrial implementation and the like. An intelligent membrane product is a novel temperature sensitive type PVDF intelligent membrane capable of sensitively responding to environment temperature change.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to an intelligent polymer membrane technology. Background technique [0002] Since the 1950s, with the development of polymer materials science and engineering, a new membrane separation technology represented by polymer separation membranes has emerged, which has the advantages of high separation efficiency, low energy consumption, and simple operation. Become one of the main means of separation and purification. However, the polymer separation membranes that have been widely used in production and scientific research at present, the membrane pore size or membrane permeability cannot respond to changes in ambient temperature. When separating a mixture of components with different molecular weights, several membranes with different pore sizes are required The membranes are separated in batches and graded. The separation process is complicated and the production cost is high, whic...

Claims

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Application Information

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IPC IPC(8): B01D69/06B01D67/00
Inventor 陈莉赵义平李万超申向王芳琪
Owner TIANJIN POLYTECHNIC UNIV
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