Preparation And Properties Of Silver Loaded High Strength Antibacterial Glass By Ion Exchange Method

The harmful bacteria affect people’s health and threaten the normal functioning of human society. And thus the study of antibacterial materials got people’s attention. At present, the more extensive researched antibacterial materials are kinds of inorganic antibacterial materials, and silver-based inorganic antimicrobial materials but also have been considerable development. As a kind of classification of inorganic antibacterial materials, antibacterial glass has important application value in daily life. This study adopts silver-based inorganic antibacterial agent to produce the materials of antibaeterial glass.In this experiment, without significant influence on the glass of the original performance, Na2O-Ca O-Si O2 glass is used for surface modification by ion exchange method. The silver-based high strength antibacterial glass, in which antibacterial agent Ag+ is implanted, has excellent antibacterial property against Escheriehia coli and Staphylococcus aurous. Through analyzing the changes of surface stress value, silver concentration, transmittance, chromatography relations and antibacterial rate, the effect of different raw material formula and process parameters on the properties of antibacterial glass is studied.The research shows that the surface stress of the antibacterial glass is higher than 580 MPa by using the two step ion exchange method. With silver exchange time increasing from 1min to 10 min and mixed molten salt Ag NO3 content increasing from 0.05wt% to 0.25wt%, the silver content of antibacterial glass increases from 1.19wt% to 7.53wt%, the total transmittance decreases from 89.60% to 80.22%, the color changes from basic colorless to light yellow and then changes to brown yellow, the antibacterial rate rises from about 95% to 99.99%. The production and use of antibacterial glass should meet various requirements. In this experiment, the process parameters of 8-0.10-4, 8-0.10-6, 8-0.15-2 and 8-0.15-4 are selected as the best technological parameters. Namely when mixed molten salt silver concentration is 0.10wt%, silver exchange time is 4min or 6min. When mixed molten salt concentration of silver for%, silver exchange time is 2min or 4min. And the antibacterial glass prepared by the optimum process parameters has low cost, high transmission rate, light-colored and excellent antibacterial performance.The study shows that the silver exchange temperature also affects the performance of antibacterial glass. Because the silver concentration of 400℃ sample or 440℃ sample is slightly lower than 420℃ sample, their total transmittance increases, their color becomes lighter and their antibacterial rate decreases. The experimental results show that the antibacterial glass prepared by one-step ion exchange method doesn’t have the characteristics of high strength. In order to obtain the more appropriate silver content, the experimentals need to extend the silver exchange time. In this experimental with silver exchange time increasing from 10 min to 30 min, the silver content of antibacterial glass increase s from 2.28wt% to 5.02wt%, the total transmittance decreases from 87.67% to 82.64%, the color changes from basic colorless to brown yellow and the antibacterial rate increases from 96.04% to 99.99%.