Preparation And Characterization Of PA6 Fiber With Anti-Bacterial And Anti-Static Properties

Polyamide 6（PA6） is widely used in industrial and civil fields because of its excellent properties.With improvement of the living standard,developing and preparing functional fiber products with antibiotic and antistatic properties becomes the focus studied at present.In this paper,a novel anti-bacterial and anti-static agent,Ag⁺-loaded nano-ZnO and a novel anti-bacterial agent Ag⁺-loaded nano-ZrP were used to modify PA6 fibers.Firstly,suitable coupling agent must be chosen to modify the Ag⁺-loaded nano-ZnO powders under different temperature.The optimum reaction conditions were determined by oil affinity experiment.The modification effect of the powders was characterized by several methods.The results showed that the surface of Ag⁺-loaded nano-ZnO was modified well with KH-570,5%of the powders mass, under the condition of 80℃.The contact angle increased obviously,while surface energy and particle size reduced significantly.Secondly,the PA6 chips,modified Ag⁺-loaded nano-ZnO powders and different dispersants were melting blended in the Two Screw Extruder,and then prepared the PA6 masterbatches with antibacterial and antistatic ability.The dispersion effects of Ag⁺-loaded nano-ZnO in PA6 masterbatch were observed by SEM and in order to provide the theoretics for spinning of antibacterial and antistatic PA6 fiber,the dynamic rheological and crystallization properties of PA6 composites resin were studied.The results showed that the Ag⁺-loaded nano-ZnO powders have good compatibility with PA6 matrixes,and particles dispersed evenly by adding dispersant PEO.At a certain angular frequency,the complex viscosity of the modified PA6 composite resins dropped with the rise of temperature.At a certain temperature,they decreased with the increase of angular frequency,which showed the shear-thinning characteristics of pseudoplastic fluid.The Ag⁺-loaded nano-ZnO played a role as heterogeneous nucleation in enhancing the crystallization rate of PA6 and shortening half time of crystallization(t_1/2).Thirdly,some antibacterial and antistatic PA6 fibers with different content Ag⁺-loaded nano-ZnO were prepared by conventional spinning.The structure and characterization of the modified PA6 fibers were studied.The modified PA6 fibers had the antibacterial efficiency above 97%against staphylococcus aureus and coliform bacillus.The volume resistivity of modified PA6 fibers dropped in 2-3 orders,and they still kept the same level even after 10 times washes.Lastly,the antibacterial PA6POY fibers and fine denier fibers,contained two different powders,Ag⁺-loaded nano-ZnO and Ag⁺-loaded nano-ZrP respectively, were prepared through high-speed spinning.The structure and characterization of these modified fibers were studied.The result showed that the crystallization, orientation and other indicators of the fine denier fibers increased,while the breaking strength and elongation at break of these decreased compared with the conventional antibacterial fibers.The two modified PA6POY fibers had excellent antibacterial property,as their ratios of killing both Escherichia coli and Staphylococcus aureus were up to 99%above.