Preparation method of hydrophilic ethylene/vinyl alcohol copolymer composite flat plate ultrafiltration membrane
A technology of copolymer and vinyl alcohol, which is applied in the field of preparing hydrophilic EVOH composite flat membrane by phase inversion method, can solve the problems of low strength, low stiffness, hydrophobicity and easy pollution, etc., achieve performance improvement, reduce membrane production cost, and process simple and easy effects
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Embodiment 1
[0020] Mix 10wt% ethylene / vinyl alcohol copolymer (20% ethylene content), 3wt% β-cyclodextrin, 3wt% polyethylene glycol, 2wt% LiCl in 2wt% acetone + 80wt% dimethyl ethyl alcohol In the amide organic solvent, stir and dissolve at 40°C for 8h, and stand at 40°C for 2h to defoam to obtain a homogeneous casting solution.
[0021] Fix the polyester non-woven fabric on the smooth and flat surface of the glass plate, and then evenly coat the prepared homogeneous casting solution on the surface of the polyester non-woven fabric with a scraper rod. After pre-evaporating in the air for 30 seconds, put It was placed in a water bath at 60°C for phase inversion to form a film. After the phase inversion, the membrane was fully rinsed in tap water to remove the organic solvent remaining on the surface of the membrane, and then placed in deionized water for 24 hours to obtain an ethylene / vinyl alcohol copolymer composite flat ultrafiltration membrane.
[0022] The pure water flux of the obta...
Embodiment 2
[0024] Mix 16wt% ethylene / vinyl alcohol copolymer (27% ethylene content), 2wt% acrylic acid, 3wt% polyethylene glycol, 2wt% cetyltrimethylammonium bromide in 2wt% acetone + 75wt % dimethylformamide organic solvent, stirring and dissolving at 30°C for 24h, standing at 30°C for degassing for 2h, to obtain a homogeneous casting solution.
[0025] Fix the polyester non-woven fabric on a smooth and flat glass plate surface, and then use a film scraper to evenly coat the prepared homogeneous casting solution on the surface of the polyester non-woven fabric. After pre-evaporating in the air for 10 seconds, Place it in a water bath at 0°C for phase inversion to form a film. After the phase inversion, the membrane was fully rinsed in tap water to remove the organic solvent remaining on the surface of the membrane, and then placed in deionized water for 24 hours to obtain an ethylene / vinyl alcohol copolymer composite flat ultrafiltration membrane.
[0026] The pure water flux of the ob...
Embodiment 3
[0028] Mix 10wt% ethylene / vinyl alcohol copolymer (38% ethylene content), 1wt% β-cyclodextrin in 2wt% acetone + 87wt% N-methylpyrrolidone organic solvent, stir and dissolve at 30°C for 36h , standing at 30°C for degassing for 6 hours to obtain a homogeneous casting solution.
[0029] Fix the polyester non-woven fabric on a smooth and flat glass plate surface, and then evenly coat the prepared homogeneous casting solution on the surface of the polyester non-woven fabric with a scraper rod, and pre-evaporate in the air for 30 seconds, Place it in a water bath at 0°C for phase inversion to form a film. After the phase inversion, the membrane was fully rinsed in tap water to remove the organic solvent remaining on the surface of the membrane, and then placed in deionized water for 24 hours to obtain an ethylene / vinyl alcohol copolymer composite flat ultrafiltration membrane.
[0030] The pure water flux of the gained ethylene / vinyl alcohol copolymer composite flat ultrafiltration...
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