1. Nano Titanium powdery modified polyethylene (PE) films of the antibacterial properties of nano titanium dioxide has the effect of killing different bacteria. Subtilis spores belong to embryonic cells, there is a strong viability; Staphylococcus aureus is a Gram-positive bacterium, E. coli is a Gram-negative bacteria. The bactericidal rate of nano titanium dioxide to different bacteria is over 92%.
From the bactericidal effect of the nano-titanium-white modified PE film on different kinds of bacteria, the bactericidal rate of the material to E. coli was 99.97%, and the bactericidal rate against Staphylococcus aureus was 99.97%. The rate was 97.42%. It is verified that this type of antibacterial plastic product has a certain antibacterial broad spectrum.
Effect of illumination conditions on the bactericidal rate of nano-white powder modified PE film The surface treatment of nano-titanium dioxide can achieve nano-scale dispersion, which can reduce the forbidden band width of electronic transition and generate electron-hole pair traps. The quantum efficiency of light increases the band width between electrons and hole traps, which increases the redox capability. Nano titanium dioxide antibacterial plastic has strong bactericidal effect when irradiated by strong ultraviolet light, and has obvious bactericidal effect when shimmering. The author used different light sources to compare the bactericidal effect of antibacterial PE film. The test results are listed in Table 1. It can be seen from Table 1 that the light source is different and the sterilization effect is small; even if it is a very weak excitation light source (light in the dark area), the nano titanium dioxide antibacterial PE film also has an obvious antibacterial effect.
3. Effect of aging on the bactericidal rate of nano-titanium dioxide modified PE film Nano-titanium dioxide antibacterial PE film is a non-dissolving antibacterial material, and its bactericidal effect will not gradually decrease or even disappear with time.
The bactericidal rate of the antibacterial PE film without aging and aging with 100h ultraviolet light irradiation to E. coli, Staphylococcus aureus, and black bud bud black variety is shown in Table 2. It can be seen from Table 2 that the sterilization rate of the PE film is still high after being subjected to the ultraviolet light aging test.
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