Plastic. Antibacterial Silver Coating Developed,

Present preparation method of antibacterial plastic is by antibacterial plastic granule application. The fault of this method is in that most of antibacterialagent packaged in plastic can not work as a antibacterium effectively. In this study, antibacterial dope is painted on the surface of plastic to solve above problem. The key points are preparation of nano-modified coating and dispersion of Nano-Ag/TiO2 modified coating. The dispersionstability of Nano-Ag/TiO2, antibacterial performance and physical properties were detected. Nano-Ag/PANI was prepared to make use of that nano-fiber was prone to disperse. Nano-Ag/PANI was adoppted in the nano-modified coating. The dispersionstability, antibacterial performance and physical properties were investigated. The results are as follows:The dispersionstability of nano-Ag/TiO2 in modified coating was studied and the effects of ultrasonic dispersion,mechanical dispersion and surface modification were optimized. The experimental results indicated that the dispersion of nano-Ag/TiO2 in PVC varnish was improved by ultrasonic dispersion for 40 min, mechanical dispersion at 4500 r/min for 50 min, adding 3% Tritonx-100 and Sodium hexametahposphate in the ratio of 6:4 and by controlling the concentration of PVC varnish at 65%. The modified PVC varnish achieved high antibacterial rate 99.9% by adding 3% nano-Ag/TiO2 in one layer film. The dispersion of nano-Ag/TiO2 in UV varnish was improved by ultrasonic dispersion for 30 min, mechanical dispersion at 4000 r/min for 60 min, adding 3% Tritonx-100 and Sodium hexametahposphate in the ratio of 6:4 and by controlling the concentration of UV varnish at 80%. The modified UV varnish achieved high antibacterial rate 99.99% by adding 4% nano-Ag/TiO2 in one layer film. Physical properties of modified coating were improved due to adding nano-Ag/TiO2. Nano-Ag/PANI fiber was prepared by adding AgNO3 into PANI. The results showed that antibacterial rate of nano-Ag/PANI fiber reached at 99.9% under AgNO3 concentration 0.001mol/L, reaction time 25-35min, temperature 25-35℃and pH value in general status. The diamerer of Ag/PANI was 90 nm by SEM, the main elements were C, Cl and Ag by EDS and AgCl in Ag/PANI was not detected by XRD. The reactions between AgNO3 and PANI were chelation and redox according to the FT-IR so that the existence of Ag were Ag0 and Ag+ comformed by XPS. Thermal stability of Ag/PANI was excellent.The effects of mechanical dispersion and ultrasonic dispersion were optimized and the results indicated that the dispersion of nano-Ag/PANI in the coating was better than that of nano-Ag/TiO2 modified coating in the conditions of mechanical dispersion at 3000r/min for 40 min and ultrasonic dispersion for 50 min. The modified coating achieved high antibacterial rate 99.9% by adding 1% nano-Ag/PANI in one layer film layer. The physical properties of modified coating were improved due to adding nano-Ag/PANI.