Preparation Of Nano-Ag/TiO₂Polyamide Antibacterial Fiber

In recent years, one dimensional nanostructure materials such as nanotubes, nano line for its large specific surface area, retrievability and other excellent properties make researchers paid great attention. Electrostatic spinning is the only way to produce polymer nano fibers in a simple process continuously at present so that becomes the most promising method to make nano fibers. The nano composite fiber that is made by electrostatic spinning method has not only excellent properties of composite material but also a special nature of nano fiber. This composite fiber has nanometer scale particle size, high specific surface area and nano space structure formed between fibers. Electrostatic spinning to make nano-Ag/TiO2antibacterial fiber, preparation of nano-silver, hydrothermal synthesis of nano-Ag/TiO2, preparation of composite fiber are investigated in this study. The parameters of preparation, antibacterial properties and photocatalytic activities are determined. The results are as follows:In the research of nano-silver preparation, the influence of ratio of reactants, concentration of nitric acid silver, adding volume of protectants on nano-silver grain diameter are investigated and the results show that the best conditions for nano-silver preparation are the mass ratio of o-phenylenediamine to nitric acid silver1:1, concentration of nitric acid silver0.6mol/L, the mass ratio of PVP addition amount to nitric acid silver1:1, the dropping rate of o-phenylenediamine1ml/min. The grain diameter of nano-siver with excellent antibacterial function made in this preparation conditions is58.7nm. If the nano-silver dosage reaches6mg/L, the antibacterial rate reaches up to99.9%.In the study of hydrothermal preparation of nano-Ag/TiO2, the effects of temperature and time on Nano-TiO2grain diameter and crystal structure on antibacterial properties and photocatalytic activities, and the effect of Ag-carrying amount on the antibacterial property are investigated. The results show that the best preparation conditions are temperature of180℃, time of18h and Ag-carrying amount of5%. The antibacterial rate of nano-Ag/TiO2that made in this optimal condition reaches99.9%and the degradation rate of methyl orange reaches90.6%.In nano-Ag/TiO2polyamide antibacterial fiber production, the effects of process conditions on the fiber diameter, of Ag/TiO2addition amount, polyamide addition amount on the fiber antibacterial properties and photocatalytic activities are investigated. The results show that the best preparation conditions are the spinning voltage of30kV, receiving distance of12cm, advancing speed of0.020ml/min, polyamide addition mass fraction of22%, Ag/TiO2addition mass fraction of4%. The antibacterial rate of nano-Ag/TiO2antibacterial polyamide fiber that made in this optimal condition reaches99.7%and the degradation rate of methyl orange reaches88.8%.