A double hydrophilic polyethylene ultrafiltration membrane and its preparation method
A polyethylene and ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve excellent antibacterial performance, improve flux and control retention performance, and stabilize extrusion process parameters
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Embodiment 1
[0064] A method for preparing a double hydrophilic polyethylene ultrafiltration membrane, prepared according to the following steps:
[0065] Add 0.2% vinyltriethoxysilane and 10.8% polyethylene (Mn=500,000) to 84% white oil in batches after oven drying , 0.4% cetyltrimethylammonium bromide, 0.3% antioxidant 168 and 0.5% DCP were heated and stirred at 180° C. for 4 hours in a vacuum state to obtain a casting solution.
[0066] Add the mixed solution of water and THF with a volume ratio of 1:1 to tetraethyl orthosilicate, stir at a high speed for 6 hours at room temperature to form a 2% tetraethyl orthosilicate sol, and titrate with 1mol / L HCL to pH=1 .
[0067] The casting solution is extruded into a specific mold through a twin-screw extruder (150 rpm), and the sol is slowly poured into the mold to undergo a gel reaction process. After 5 times transverse stretching, it was extracted in dichloromethane. After heat-setting at 60°C for 15 minutes, the double-hydrophilic polye...
Embodiment 2
[0069] A method for preparing a double hydrophilic polyethylene ultrafiltration membrane, prepared according to the following steps:
[0070] Add 0.2% vinyltriethoxysilane and 34.8% polyethylene (Mn=500,000) to 60% diphenyl ether in batches after oven drying Sugar, 0.4% cetyltrimethylammonium bromide, 0.3% antioxidant 168 and 0.1% DCP were heated and stirred at 200° C. for 4 hours under vacuum to obtain a casting solution.
[0071] Add the mixed solution of water and THF with a volume ratio of 1:1 to tetraethyl orthosilicate, stir at a high speed at room temperature for 6 hours to form a 2% tetraethyl orthosilicate sol, and titrate with 1mol / L HCL to pH=2 .
[0072] The casting solution is extruded into a specific mold through a twin-screw extruder (150 rpm), and the sol is slowly poured into the mold to undergo a gel reaction process. After 15 times transverse stretching, it was extracted in dichloromethane. After heat-setting at 80°C for 10 minutes, the double-hydrophilic...
Embodiment 3
[0074] A method for preparing a double hydrophilic polyethylene ultrafiltration membrane, prepared according to the following steps:
[0075] 2% vinyl tri-tert-butyl silane and 20% polyethylene (Mn=1 million) are added in batches to 73% diphenyl ether after oven drying Chitosan, 0.4% methylcellulose, 0.3% antioxidant 1010 and 0.5% DCP were heated and stirred under vacuum at 200°C for 4 hours to obtain a casting solution.
[0076] Add the mixed solution of water and THF with a volume ratio of 1:2 to tetraethyl orthosilicate, stir at a high speed at room temperature for 8 hours to form a 4% tetraethyl orthosilicate sol, and titrate with 1mol / L HCL to pH=2 .
[0077] The casting solution is extruded into a specific mold through a twin-screw extruder (200 rpm), and the sol is slowly poured into the mold to undergo a gel reaction process. After 15 times transverse stretching, it was extracted in dichloromethane. After heat-setting at 80°C for 10 minutes, the double-hydrophilic p...
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