Nano-silver antibacterial ultrafiltration membrane and preparation method thereof
A nano-silver antibacterial and ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of difficult automation, microbial contamination, fouling and blocking membrane performance, etc., and achieve the improvement of surface hydrophilicity, Good anti-pollution performance and long-term antibacterial effect
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Embodiment 1
[0027] Embodiment 1 (sample 1 comparative example):
[0028] Mix PEG20000 containing 16wt% polysulfone membrane material with a mass concentration of 2.0wt% and organic solvent N,N-dimethylacetamide (DMAc), heat to 80°C and stir for 24 hours, cool to 25°C and let stand Degassing for 8 hours to obtain casting solution A; scrape coating casting solution A on a polyester non-woven mechanical support, and use 35°C pure water as a coagulation bath to prepare a flat ultrafiltration membrane separation by phase inversion method functional layer.
Embodiment 2
[0029] Embodiment 2 (sample 2):
[0030] Sample 1 was placed in 0.5 wt% polyethyleneimine aqueous solution with a weight average molecular weight of 70000Da for 30 seconds, after scraping off excess aqueous solution, washed with pure water for 3 minutes and then immersed in 25°C antibacterial treatment agent for 1 minute; The antibacterial treatment agent is prepared by stirring and mixing 1% of silver nitrate nano-silver ions with a size of 10 to 40nm, 0.5% of sodium hydroxide and 98.5% of water for 24 hours under the assistance of ultrasonic waves. Then, heat and dry after removing excess antibacterial treatment agent, the heating temperature is 50 degrees, and the drying time is 5 minutes.
[0031] Antibacterial performance evaluation: The antibacterial performance evaluation refers to the test method 100-2004 of the American Association of Textile Chemical Colorists (AATCC). In this paper, Escherichia coli (E.coli) was selected as the representative bacteria to evaluate the...
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