Long-acting antibacterial ultrafiltration membrane and preparation method thereof

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...

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