Method for preparing hydrophilic polyethersulfone ultrafiltration membrane by taking polyethylene glycol as additive
A technology of polyethersulfone ultrafiltration membrane and polyethylene glycol, which is applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of increased filtration energy consumption and shortened service life, and achieves low cost, excellent performance, The effect of a wide range of raw material sources
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[0018] The preparation method of a hydrophilic polyethersulfone ultrafiltration membrane with polyethylene glycol as an additive according to the present invention, the preparation method uses polyethersulfone PES as the main material of the ultrafiltration membrane, dissolves and mixes with the ultrafiltration membrane under appropriate conditions Various additives are blended, and then an appropriate amount of polyethylene glycol PEG is added to improve its hydrophilic performance. Finally, under a specific casting solution, a hydrophilic polyethersulfone ultrafiltration membrane is obtained through a coating process, including The following steps:
[0019] (1) Fully dry polyethersulfone PES at 105°C, take polyethersulfone PES powder with a mass fraction of 19%-24%, a porogen with a mass fraction of 5%-8%, and a mass fraction of 1-5% The polyethylene glycol PEG and 75%-63% organic solvent are placed in a three-neck round bottom flask, stirred at a speed of 150-250r / min at a ...
Embodiment 1
[0025] Fully dry the PES, take PES with a mass fraction of 19% and PVP with a mass fraction of 5%, weigh DMAc with a mass fraction of 72%, and PEG with a mass fraction of 4% in a three-neck round bottom flask, in a water bath at 90 Stir at ℃ for 4 hours to obtain a clear and transparent casting solution, and use a vacuum pump to degas the casting solution;
[0026] Pour the completely defoamed casting solution into the glass plate, adjust the speed of the scraper of the film coating machine to 40cm / s, and control the thickness to 70-72 um to scrape the film; put the nascent film in the air for 10s and then put it into the DMAc / H 2 In the first coagulation bath of O=6 / 4, after the membrane is completely formed and separated from the glass plate, the membrane is transferred to DMAc / H 2 Soak in the second coagulation bath with O=0 for 1-2min until the surface temperature of the membrane drops to room temperature, then put it into the pure water of the third coagulation bath and ...
Embodiment 2
[0028] Fully dry the PES, take PES with a mass fraction of 22% and PVP with a mass fraction of 1%, weigh DMAc with a mass fraction of 72%, and PEG with a mass fraction of 5%. Stir at ℃ for 4 hours to obtain a clear and transparent casting solution, and use a vacuum pump to degas the casting solution;
[0029] Pour the completely defoamed casting solution into the glass plate, adjust the speed of the scraper of the coating machine to 38cm / s, and control the thickness to 70-72 um to scrape the film. After standing in the air for 10s, the nascent film was quickly put into DMAc / H 2 In the first coagulation bath of O=8 / 2, after the membrane is completely formed and separated from the glass plate, the membrane is transferred to DMAc / H 2 Soak in the second coagulation bath of O=6 / 4 for 1-2 minutes until the surface temperature of the membrane drops to room temperature, then put it into the pure water of the third coagulation bath and let it stand still. During this period, change it...
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