Influence of thermal hysteresis on properties of polypropylene containing antibacterial agent

摘要

The effects of antibacterial agents on the antibacterial and hue properties of recycled PP were examined quantitatively. Ag-zeolite and Zinc pyrithione were used as the antibacterial agents. Virgin and recycled PP pellets containing antibacterial agents were prepared by a single pass extrusion or double pass (repeated) extrusion, respectively. Test specimens were then injection molded to evaluate the antibacterial and hue properties. Processing temperatures of 200℃ and 240℃ were used for both extrusion and injection processes. Antibacterial properties were of antibacterial activity. Color difference was measured to evaluate hue. It was found from the experimental results that antibacterial activity increased for PP with Ag-zeolite, compared to the decreased activity with Zinc pyrithione with increasing thermal hysteresis. The color difference of PP with Ag-zeolite was smaller than that of PP with Zinc pyrithione with increasing thermal hysteresis.