Structural Control Of Copper-based Antibacterial Materials And Study On Long-lasting Antibacterial Modification Of PET Fabrics

Production of fabrics with long-lasting antibacterial performance is one of the main research hotspots in the textile field.Copper-based materials have been widely utilized in surface antibacterial treatment of various materials due to their characteristics of low quantity and high efficiency in the field of antibacterial.The study and preparation of the modified polyethylene terephthalate（PET）fabric with durable long-lasting antibacterial property via using copper-based materials have important practical significance for the development of functional fabric.Next,the main research work of this paper are as follows:（1）Firstly,copper acetate solution was used as a polycationic electrolyte,mixed solution of tannic acid and graphene oxide（TA/GO）was applied as polyanionic electrolyte.Antibacterial PET fabric with excellent superhydrophobic performance was prepared via in-situ growing of copper nanoparticles（Cu NPs）and subsequent modification with 1-octadecanethiol（DT）.The modified PET fabric exhibited superhydrophobic property with a static water contact angle greater than 150°,which could decrease bacterial adhesion to the fabric surface.Importantly,the modified PET fabrics had fantastic antibacterial activity with 99.9%antibacterial efficiency against both S.aureus and E.coli.More remarkably,the prepared fabrics still retained excellent superhydrophobic performances and antibacterial properties even after multiple washing cycles or rubbing cycles.（2）Then,cuprous oxide（Cu₂O）was employed as the core material of microcapsule,chitosan（CS）was employed as the wall material of microcapsule,OP-10 was used as emulsifier,and the glutaraldehyde solution was applied as the crosslinking agent,chitosan/cuprous oxide（CS/Cu₂O）microcapsules were prepared by the emulsion crosslinking method.The preparation process of microcapsules was investigated with the emulsifier content,core-wall ratio and chitosan solution concentration as independent variables.Finally,the prepared CS/Cu₂O microcapsules had obvious core-shell structure,and the wall thickness of the microcapsules was about 400 nm;The average particle size of theirs was 5.52μm,and the polydispersity coefficient was moderate;Thermogravimetric analysis exhibited that the drug loading rate of microcapsules was about 77.43%;Inductively coupled plasma emission spectroscopy found that the coating modification of Cu₂O could slow down the release rate of copper ion to the outside to a certain extent.（3）CS/Cu₂O microcapsules were applied as antibacterial agent,and water-based polyurethane（WPU）was employed as matrix film-forming resin,then the modified long-lasting antibacterial coated PET fabric was obtained by coating technology.The effects of the addition of antibacterial agent on the processing performance of WPU antibacterial coating material were emphatically discussed.The antibacterial result exhibited that when the appending percentage of antibacterial agent was 4.0%,the antibacterial performance of the modified PET fabric was wonderful due to the bacteria killing rate towards S.aureus and E.coli reached about 99.9%.And the antibacterial performance was stable against washing or rubbing.Furthermore,the obtained coated PET fabric had a good gentle effect on the release of copper ion,which was conducive to achieve long-lasting antibacterial performance.