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
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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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