Synthesis of nano-Ag powder antibacterial agent and evaluation of its antibacterial activities

With AgNO3, H2O2 and PVP as raw materials, the nano-Ag powder inorganic antibacterial agent was prepared by chemical reduction, then the antibacterial finish was prepared with the nano-Ag poweder as antibacterial agent and acrylate polymer as adhesive. The antibacterial activities of antibacterial agent were evaluated by the halo method. The experiment results showed that better reaction conditions of nano-Ag powder antibacterial agent were as follows: concentration of AgNO3 at 5%, activation time of AgNO3 at 12 h, concentration of H2O2 at 6%, concentration of PVP at 5%, reaction tempetature at 40 ℃, reaction time at 3 h. When the concentration of Ag powder in the antibacterial finish was 0.5 g/L, the diameter of antibacterial ring was 13.1 mm and 13.7 mm respective for staphylococcus and escherichia coli. When the sample after the antibacterial test were placed after six months, the antibacterial rings were also clear and not infected with germ. So the nano-Ag powder have good antibacterial activity and antibacterial durable effect.