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Study on the Property of Antimicrobial Agent and Antimicrobial Plastics

Author: LiXia
Tutor: XueTao；HeLi
School: Guizhou University
Course: Materials Science
Keywords: Antibacterial agents Rare earth cerium Phosphate Antibacterial plastic Mechanical Properties Microcellular foaming
CLC: R318.08
Type: Master's thesis
Year: 2007
Downloads: 402
Quote: 2
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Abstract


This thesis, we selected three antimicrobial agents: Ce 4 / ZnO composite antibacterial agent, phosphate glass containing silver antimicrobial agent and liquid foaming system dedicated Biofoam (isopropyl alcohol contained quaternary ammonium salt) antimicrobial agent Ce 4 / ZnO composite powders through the process optimization homemade antimicrobial agent from. Experimental study of the three kinds of the antimicrobial properties of the antimicrobial agent, and the antimicrobial agent is applied to the polymer made of antibacterial plastic. The experimental nano ZnO as the carrier, determine of Ce 4 / ZnO composite antibacterial agent best preparation process, examines the different of ZnO Ce ratio doping, The zone of inhibition experiments and the minimum inhibitory concentration (MIC) experiments to detect its anti-bacterial properties, and to explore its antibacterial mechanism. The experimental results show that the nano-ZnO rare earth Ce 4 adsorption rate is very high, up to 100%, and almost free from the the ZnO with Ce 4 molar ratio influence. Significantly improved photocatalytic effect and antibacterial properties of nano-ZnO doped Ce 4 , Ce 4 / ZnO composite antibacterial agents for E. coli minimum inhibitory concentration of 100mg / l against Staphylococcus aureus The minimal inhibitory concentration of 150mg / l, and to achieve a good antibacterial effect. The composite antibacterial agent was applied to the polymer, with PE as a matrix resin, by melt-blending extrusion process to prepare the CE 4 / ZnO antibacterial polyethylene plastic, the results show that, when the antibacterial agent powder 1% of the body added in PE, PE antibacterial plastic cost to achieve the best, with excellent long-lasting antibacterial properties, antibacterial rate reached more than 97% of E. coli and Staphylococcus aureus, and large intestine bacilli, antimicrobial effects superior to Staphylococcus aureus. Phosphate glass containing silver antimicrobial agent has a very strong anti-bacterial properties, its minimum inhibitory concentration (MIC) of E. coli to 50 mg / l, the minimum inhibitory concentration of 100 mg / l of Staphylococcus aureus, excellent antibacterial effect. Experimental performance polypropylene composites prepared to phosphate glass containing silver antimicrobial agent. The results showed that when the powder of antibacterial agents added in PP 2 ‰, antibacterial rate can reach more than 99%, prepared antibacterial PP plastic with excellent, long-lasting antimicrobial properties. In the kneading method, single-screw extrusion and twin screw extrusion blending process of the law prepared by the three methods of antimicrobial masterbatch, the experimental results show that the twin-screw extruder prepared antimicrobial masterbatch, before adding it to the PE system the best method is the most feasible as antimicrobial plastics, made of antibacterial effect of the antibacterial polymer. Antibacterial Masterbatch preparation of antibacterial plastic is added to make the antimicrobial agent concentrate and uniformly dispersed in the surface of the matrix resin, and the mechanical properties of the matrix resin does not have a significant impact. Phosphate glass containing silver antimicrobial agent and Biofoam-foaming liquid antibacterial agent made of microcellular foaming antibacterial polymer, the results showed that the preparation of microcellular foaming antibacterial PP has excellent antibacterial effect but also has a long-lasting antibacterial properties. And microcellular foaming and antibacterial synergy, microcellular foaming antibacterial PP pure foam samples compared to the antibacterial agent is not added, the tensile strength decreased slightly, breaking elongation, bending strength and impact strength at room temperature. was increased, the density increases slightly. The antimicrobial agent was added on the expansion ratio of the foamed article, the cell number and cell distribution of little influence, and the phosphate glass containing silver antibacterial agent in the foaming system also has a effect of refinement bubble holes.

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