Preparation And Application Of Antibacterial Polyester Containing Zinc Oxide

Polyethylene terephthalate(PET)has good spinnability and mechanical properties.PET fiber is the most produced chemical fiber today,which is widely used in civil textile,medical textile,and industrial textile fields.It is very important to endow PET antibacterial function.In this paper,zinc oxide nanoparticles(Zn O NPs)were used as antibacterial agents.Firstly,zinc oxide glycol(Zn O-EG)dispersion was prepared by wet grinding.Secondly,the antibacterial modified polyester was prepared by in-situ polymerization.Finally,the antibacterial modified polyester fibers were prepared by melt spinning.(1)Firstly,Zn O-EG dispersions were prepared by wet grinding method.The results showed that the particle size of Zn O-EG dispersion prepared by wet grinding was significantly smaller than that of dispersion prepared by magnetic stirring.The D90 of Zn O-EG dispersion solution reached the minimum value(0.481 μm)after grinding 20 min with polyethylene-I.Moreover,D90 gradually increased with the increasing of the grinding time.(2)Secondly,three kinds of antibacterial modified polyester chips with different Zn O NPs contents were prepared by in-situ polymerization.Morphology analysis and energy spectrum analysis showed that Zn O NPs were uniformly dispersed in polyester chips.Analysis results of melt crystallinity and thermal stability showed that Zn O NPs improved the crystallization rate of polyester as nucleating agents.The analysis of polyester properties showed that the addition of Zn O NPs had little effect on the characteristic viscosity of polyester(0.67 ～ 0.70 d L/g).The addition of Zn O NPs made the polyester more hydrophilic.The color of the polyester chips became gray when the Zn O NPs content was 1.0 wt %.(3)Finally,the antibacterial modified polyester fibers were prepared by melt spinning-drawing one-step method.Morphology analysis showed that Zn O particles were evenly dispersed in the fibers.The analysis results of mechanical properties showed that the addition of Zn O NPs increased the breakage elongation and decreased the dynamic friction coefficient.The mechanical strength of the fibers increased when Zn O NPs content was 0.2 wt %.The thermal shrinkage rates and hygroscopic properties showed that the addition of Zn O NPs increased the moisture recovery rates and boiling water shrinkage rates of polyester fibers.Antibacterial experiments showed that the bacterial inhibition rates of the modified fibers against staphylococcus aureus(S.aureus)and Escherichia coli(E.coli)were 98.6 % and 94.3 % when Zn O NPs content was 0.5wt %.The bacterial inhibition rates of the modified fibers against S.aureus and E.coli were more than 99.9 % with the Zn O NPs content increased to 1.0 wt %.Furthermore,the bacterial inhibition rates of the fibers was not affected after 50 times washing.