Antimicrobial Polymer

In the first place, the antimicribal mechanism of Nano-SiO₂ Grafting with High-molecular-weight Quaternary Ammonium Salt was studied in this paper. TEM analysis showed that the sterilization process of it was composed of two steps, electrostatic interaction and cell-lysis.Next, the antimicrobial masterbatches were produced by double-screw extruders, the most appropriate speed of screw carrying resin into double-screw extruders was about 15 r/min; The best concentration of antimicrobial agent added to masterbatches was 10%; For antimicrobial Nano-SiO₂ , the appropriate extruding temperature was lower than 150℃ ; as the temperature increasing, the colour of silver-carring phosphate glasses became deepen;but the colour of zinc oxide-carring cerium didn't change when the temperature increased.Thirdly, we found a kind of carrying resin can easily move the antimicrobial agent to the surface of matrix resin,It must has lower plasticizing temperature, higher value of melt index and poor compatibility. But carrying resin with poor compatibility can make the mechanical properties of matrix resin reduced.Finaly, the technic of preparation of resin samples with three kind of antimicrobial agents had been optimized in this paper. when 3% antimicrobial Nano-SiO₂ was added into low density polyethylene , The antimicrobial activity of these resin samples against Escherichia.Coli and Staphylococcus aureus could attach 99.99%, and the antimicrobial activity was reduced by 2% when the resin samples were placed in 55℃ water for fifteen days; If we added 1‰ silver-earring phosphate glasses into polyethylene, The antimicrobial activity of the resin samples could attach 97%, if the adding amount of the above antimicrobial agent increased to 3‰, The antimicrobial activity could attach 100%, and it had a decrease of 0.5% when the samples were placed in 55℃ water for fifteen days; when added 2‰ zinc oxide-earring cerium into polyethylene, The antimicrobial activity could attach 95%, if we added more, we couldn't get the antimicrobial activity up to 98%, when the...