Nano-ZnO powder, also known as ultra-fine zinc oxide, is a new type of multifunctional fine inorganic material. Due to the micronization of the particle size, the nano zinc oxide powder produces surface effects, small size effects, quantum effects and macroscopic quantum tunneling effects that the bulk material does not possess, and exhibits many special properties. Such as non-toxic, non-migratory, fluorescent, piezoelectric, antibacterial deodorization, absorption and scattering of ultraviolet light. Nano zinc oxide has many new uses in the field of technology. Such as the manufacture of gas sensors, phosphors, antibacterial materials, UV shielding materials, varistors, image recording materials, piezoelectric materials, pressure sensitive materials, varistors, high efficiency catalysts, magnetic materials and plastic films.
With the deep 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 researches on its antibacterial mechanism. This experiment uses two kinds of self-made nano-oxidation. Zinc and ordinary zinc oxide were used for antibacterial finishing of cotton fabrics. The antibacterial mechanism of three different zinc oxide powders and their finished fabrics was discussed. It was found that the antibacterial mechanism of nano zinc oxide was the combination of photocatalysis and metal ion dissolution. the result of.
Finishing process: weigh 3 g of low poly sodium polyacrylate, adjust the pH to 9-10 with 10% ammonia water, add 80 g of water and 1.5 g of ordinary zinc oxide or nano zinc oxide, stir vigorously for 10 min, and put the mixed solution Shake well for 2 h in a human ultrasonic oscillator, add 1 g of waterborne polyurethane binder and 15 g of distilled water, and stir for 10 min. The cotton bleached cloth is added to the prepared finishing liquid, and the two are immersed in two rollings, and the rolling ratio is 80%, and dried at 100 ° C.
For the antibacterial properties of different bacteria, the antibacterial properties of all samples against Staphylococcus aureus are generally stronger than their antibacterial properties against E. coli. The reason is that Staphylococcus aureus is a Gram-positive bacterium with pI isoelectric value of 2 to 3, and Escherichia coli belongs to Gram-negative bacteria. The isoelectric value of pI is 4 to 5, so it is near neutral or weakly alkaline. In the environment, bacteria are negatively charged, especially Gram-positive bacteria carry more negative charges. The surface of the nano zinc oxide is positively charged, and it is easy to adsorb the Gram-positive bacteria, Staphylococcus aureus, which has a relatively negative charge, to its surface.