Nano zinc oxide is a new type of multifunctional fine inorganic material. Due to the small particle size, the nano-zinc oxide powder produces surface effects, small size effects, quantum effects and macro-quantum tunneling effects that the bulk material does not have, and exhibits many special properties. Such as non-toxic, non-migration, Fluorescence, piezoelectricity, antibacterial deodorization, absorption and scattering of ultraviolet rays, etc. Nano ZnO has many new uses in the field of science and technology. Such as the manufacture of gas sensors, phosphors, antibacterial materials, ultraviolet shielding materials, varistors, image recording materials, piezoelectric materials, pressure sensitive materials, varistors, catalysts, magnetic materials and plastic films.

With the continuous in-depth research on nano-zinc oxide, it has been successfully applied to textiles in many fields such as medical, health, and health care, but there are few studies on its antibacterial mechanism. This experiment uses two homemade nano-oxides Zinc and ordinary zinc oxide are used for antibacterial finishing of pure cotton fabrics. The antibacterial mechanism of three different zinc oxide powders and fabrics after finishing is discussed. It is found that the antibacterial mechanism of nano-zinc oxide is the combined action of photocatalysis and metal ion dissolution. the result of.  

Finishing process: Weigh 3g low poly sodium polyacrylate, adjust the pH to 9-10 with 10% ammonia water, add 80 g water and 1.5 g ordinary zinc oxide or nano zinc oxide, stir vigorously for 10 minutes, and put the mixed solution into ultrasonic vibration Fully shake in the container for 2 h, add 1 g of water-based polyurethane adhesive and 15 g of distilled water, and stir well for 10 min. Add the pure cotton bleached cloth to the prepared finishing solution, dip it twice and roll it twice, with a rinsing rate of 80%, and dry it at 100°C.  

The antibacterial properties of different bacteria are generally stronger for all samples against Staphylococcus aureus than for Escherichia coli. The reason is that Staphylococcus aureus is a gram-positive bacterium with a pi isoelectric point value of 2 to 3, and Escherichia coli is a gram-negative bacterium with a pi isoelectric point value of 4 to 5, so it is near neutral or weakly alkaline. In the environment, bacteria are all negatively charged, especially Gram-positive bacteria are more negatively charged. The surface of nano-zinc oxide is positively charged, it is easy to adsorb the more negatively charged Gram-positive bacteria-Staphylococcus aureus to its surface, thereby killing it.

Therefore, nano zinc oxide can be widely used in masks, protective clothing and other textile fabrics that require antibacterial. It has good antibacterial effect and is cheaper than silver-based antibacterial agents. It is not harmful to the human body and beneficial to the human body. The human body itself needs zinc supplementation.

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