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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

Inactive Publication Date: 2015-09-30
SHENZHEN CHENGDELAI IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The disadvantage of the prior art is that the method of filling particles such as silver, zinc, and copper to form a film can effectively inhibit bacteria, but the bactericidal effect is not ideal, and the particles embedded in the film cannot be completely released.
The surface cross-linking technology is complex and difficult to realize in industry, and its hygiene is difficult to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a long-acting antibacterial ultra-filtration membrane and a preparation method thereof. The method comprises the following steps of: mixing polyvinyl chloride and a chloroethylene-vinyl acetate copolymer, pouring the mixture into a solvent which is pre-heated to be at 45-55 DEG C; agitating and swelling; then adding a pore-foaming agent and continually agitating; adding an antibacterial high-molecular polymer and continually agitating for 6-10 hours to prepare a membrane casting solution for spinning, wherein in the membrane casting solution for the spinning, the content of the antibacterial high-molecular polymer accounts for 2-10% of the common content of the polyvinyl chloride and the chloroethylene-vinyl acetate copolymer according to a weight percentage, the content of the pore-foaming agent accounts for 5-15% of the total amount of the membrane casting solution for the spinning, and the residue is the solvent; and finally, spinning by utilizing a method of dry spraying and wet spinning, extruding the membrane casting solution through inserting an insert-pipe-type spinning head, and utilizing a non-solvent induced separation principle to prepare the antibacterial ultra-filtration membrane. The membrane simultaneously has sterilization and antibacterial functions; and a membrane preparation process is simple and convenient and the cost is low.

Description

technical field [0001] The present invention relates to the implementation of the separation process and the equipment used by general physical or chemical methods, especially to the semi-permeable membrane used in the separation process or equipment characterized by materials, especially to the food-grade polyvinyl chloride ultrafiltration with long-lasting antibacterial effect Membranes and methods for their preparation. Background technique [0002] The existing ultrafiltration membrane technology is a new type of filter material technology developed in the 21st century, which can intercept particles with a molecular weight of 300-500,000 Daltons. Since the 1990s in China, ultrafiltration membrane technology has been applied to domestic water treatment, and it has a history of 20 years. The ultrafiltration membrane can effectively remove rust, sediment, colloid, some macromolecular proteins and other substances in domestic water, but because the ultrafiltration membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/30B01D69/02B01D67/00
Inventor 欧阳葵会
Owner SHENZHEN CHENGDELAI IND CO LTD
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