Preparation and Properties of Nano Zinc Oxide/Poly Lactic Acid Antibacterial Packaging Films

Nano zinc oxide (Nano-ZnO) has been a hotspot because of its excellent antibacterial properties. Nano-ZnO was added into the poly lactic acid (PLA) to form the antibacterial film, and then the properties were tested, including the antibacterial rate, mechanical property, light transmittance, haze, the water vapor permeability, surface and fracture morphology observed by SEM. It was showed that the packaging material had the antibacterial properties due to it was added with Nano-ZnO particles. The mass fraction of the Nano-ZnO was 6%, which could inhibit the growth of staphylococcus aureus and escherichia coli effectively. The mass fraction of the Nano-ZnO was 4%, the mechanical properties of the antibacterial film was the best. With the addition of Nano-ZnO, The light transmittance of the antibacterial film decreased, the haze increased. So it affected on visibility of product. Nano-ZnO/PLA antibacterial film as biodegradable functional material has a certain application prospects in the packaging.