Long-acting antibacterial ultrafiltration membrane and preparation method thereof
An ultrafiltration membrane, a long-term technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in ensuring sanitation, difficulty in industrial realization, and unsatisfactory bactericidal effect, and achieve membrane production The effect of simple process and low cost
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Embodiment 1
[0033] After mixing 180g of food-grade polyvinyl chloride with a polymerization degree of 1,300 and 70g of vinyl chloride-vinyl acetate copolymer with an intrinsic viscosity of 30 ml / g, pour 595g of dimethylacetamide preheated to 45°C to 55°C After stirring for 8-12 minutes in the solution, 150 g of polyethylene glycol 600 was added therein, and the stirring was continued for 8-12 minutes. Finally, 5g of polyhexamethylene guanidine, that is, polyhexamethylene guanidine accounting for 2% of the common content of food-grade polyvinyl chloride and vinyl chloride-vinyl acetate, is added to the above solution, at 190 to 210 rpm After 6 hours of continuous stirring at the rotating speed, the casting solution for spinning was obtained; spinning was carried out by dry-jet wet spinning, and the casting solution was extruded through the inserted tubular spinneret, and the antibacterial PVC ultrafiltration membrane. The obtained antibacterial ultrafiltration membrane antibacterial rate ...
Embodiment 2
[0035] After mixing 200g of food-grade polyvinyl chloride with a polymerization degree of 700 and 60g of vinyl chloride-vinyl acetate copolymer with an intrinsic viscosity of 80 ml / g, pour 460g of dimethylformamide preheated to 45°C to 55°C and 204g of N-methylpyrrolidone solution, after stirring for 8-12 minutes, add 50g of polyethylene glycol 1500 therein, and continue stirring for 8-12 minutes. Finally, 26g of polyhexamethylene biguanide, that is, polyhexamethylene biguanide that accounts for 10% of the common content of food-grade polyvinyl chloride and vinyl chloride-vinyl acetate, is added to the above solution, at 190 to 210 rpm After stirring continuously for 10 hours at a rotating speed, the casting solution for spinning is obtained; spinning is carried out by dry-jet wet spinning, and the casting solution is extruded by inserting a tubular spinneret, and the antibacterial PVC ultrafiltration membrane. The obtained antibacterial ultrafiltration membrane antibacterial...
Embodiment 3
[0037] After mixing 150g of food-grade polyvinyl chloride with a polymerization degree of 1,800 and 70g of vinyl chloride-vinyl acetate copolymer with an intrinsic viscosity of 50 ml / g, pour 669g of N-methylpyrrolidone solution preheated to 45°C to 55°C After stirring for 8-12 minutes, add 80 g of polyethylene glycol 400 and 20 g of polyvinylpyrrolidone K30 into it, and continue stirring for 8-12 minutes. Finally, 5g polyhexamethylene guanidine and 6g polyhexamethylene biguanide, that is, the antibacterial high polymer that accounts for food grade polyvinyl chloride and vinyl chloride-vinyl acetate common content 5% is added in the above-mentioned solution, at 190 After continuous stirring for 8 hours at a speed of ~210 rpm, the casting solution for spinning is obtained; spinning is carried out by dry-jet wet spinning, and the casting solution is extruded by inserting a tubular spinneret, using a non-solvent Antibacterial PVC ultrafiltration membrane prepared by phase separation...
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