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Preparation method of temperature-responsive polyvinylidene fluoride flat separation membrane

A temperature-responsive, separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., to achieve the effect of simple method, easy industrialization, and good film-forming performance

Inactive Publication Date: 2012-02-22
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

[0035] (1) Pretreatment 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 lye 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 initiator AIBN, and add them into a three-necked flask under the co...

Embodiment 2

[0041] (1) Pretreatment 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 lye 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 and 0.5g of initiator AIBN, and add them into a three-necked flask u...

Embodiment 3

[0047] (1) Pretreatment 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 lye 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-necked flask...

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Abstract

The invention discloses a method for preparing a temperature-responsive polyvinylidene fluoride flat separation membrane. The invention belongs to the field of membrane technology, and in particular relates to an intelligent polymer flat plate separation membrane technology. The technical scheme is as follows: 1. Alkali treatment of PVDF powder; 2. Preparation of temperature-sensitive copolymer: Copolymerize the alkali-treated PVDF powder with temperature-sensitive monomer NIPAAm to synthesize PVDF-g-PNIPAAm copolymer; 3. Phase inversion method Preparation of temperature-responsive PVDF flat separation membrane. The preparation method of the film-forming polymer of the present invention has the characteristics of simple process, low cost, no need of special equipment, easy industrial implementation and the like. The smart film product is a new type of temperature-sensitive PVDF smart film that can respond sensitively to changes in ambient temperature.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to an intelligent polymer flat plate separation 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34
Inventor 赵义平陈莉李万超申向刘晓红
Owner TIANJIN POLYTECHNIC UNIV
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