Antibacterial waterproof breathable film and preparation method thereof

Abstract

The invention provides a preparation method of an antibacterial waterproof breathable film. The preparation method comprises the following steps: dissolving polyethylene and polyethylene glycol terephthalate in a film-forming solvent, adding an ionic liquid, and uniformly mixing to obtain a polymer solution; carrying out ultrasonic atomization on the micro-droplets by using an ultrasonic humidifier, spraying micro-droplet airflow onto a substrate, and forming a honeycomb micro-porous film after the solvent and the micro-droplets are completely volatilized; stacking the plurality of layers of films, and annealing to obtain a three-dimensional honeycomb porous film; and then performing plasma activation and plasma grafting of chitosan tetra-alkyl quaternary ammonium salt and perfluoro-alkyl trichlorosilane on the three-dimensional honeycomb porous film, and performing vacuum drying to obtain the antibacterial waterproof breathable film. The antibacterial waterproof breathable film prepared by the invention has a honeycomb structure, the water-resistant oil-resistant component and the antibacterial component are grafted on the surfaces of the film and the micro-pores, and the density of antibacterial groups is high, so that the film has excellent waterproof, breathable and antibacterial properties, and the antibacterial effect is good in durability.

Description

Technical field[0001]The present invention relates to the field of membrane techniques, and more particularly to an antibacterial waterproof and ventilated film and a preparation method thereof.Background technique[0002]Waterproof and breathable film is a new type of polymer waterproof material, which is a film that allows gas to pass, but can also block liquid, such as water. In order to achieve the purpose of breathability, the water-proof and breathable film is designed to be manufactured to a unique plastic film having a multi-pore structure, from the cross section of the film, a small small hole having only 1-2 microns of 1-2 microns is distributed. Thus, the gas molecules like air and / or water vapor are easily permeated from the moisture of the humid heat through these small holes, and the external fresh air is constantly influent through these apertures, thereby achieving the purpose of replacement, The film has a respiratory function; on the other hand, the liquid molecule...

AI Technical Summary

Problems solved by technology

[0003] At present, the latest production technology of waterproof and breathable microporous membranes is blow molding and casting. Most of the existing waterproof and breathable membranes use inorganic substances such as calcium carbonate as pore-forming agents, which are mixed with polymers. After twin-screw extrusion, it is stretched transversely, longitudinally or biaxially. The position of the pore-forming agent is used as a defect point. After stretching, a micropore channel with a size of sub-nanometer is formed in the cross-section of the film. Water vapor molecules can pass through, and the volume Larger liquid associations and water molecules cannot pass through

However, the pore size of the waterproof and breathable membrane prepared by this method is difficult to control, the uniformity of the micropores is poor, and the connectivity between the pores is not good, so its air permeability is poor, and the waterproof performance needs to be strengthened.

[0004] Chinese patent (CN109575396A) is based on metallocene polyethylene and high-pressure polyethylene, adding inorganic fillers to make a waterproof and breathable film by heating and stretching; the waterproof and breathable film made by this method has uneven microscopic pore structure and low tensile strength. Low, its ductility is also poor

[0005] In addition, the antibacterial properties of existing waterproof and breathable membranes are poor

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