Preparation Of Cu NP/WPU Antibacterial Coating Modified By Nano Hybrid And Its Application On PET Fabric

Polyethylene terephthalate（PET）fabric has the advantages of high strength and good dimensional stability,which is widely used in all kinds of textiles.However,PET fabric has a porous structure,bacteria and other microorganisms are easy to adhere to its surface,it will lead to the spread of pathogenic bacteria.Copper based nanomaterials have high antibacterial properties.This paper prepared copper nanoparticles（Cu NP）hybrid materials with different structures by nano hybrid modification.Nano-hybrid modification of Cu NP was studied and it was added to WPU to study the structure and properties of composite coating and its application in antibacterial coated PET fabric.The main research contents are as follows:（1）Cu NP was prepared by liquid phase reduction method using Cu Cl₂ as precursor;CNC was obtained by hydrolysis of MCC.The morphology and structure of Cu NP and CNC were tested.The results show that Cu NP is granular structure and CNC is rod-like structure.The antibacterial activity of Cu NP was studied.The antibacterial zone of Cu NP to Escherichia coli and Staphylococcus aureus was 12.2mm and 15.6mm,respectively.This shows that it has excellent antibacterial activity.（2）CNC was oxidized with 2,2,6,6 tetramethylpiperidine-1-oxy（TEMPO）oxidation system to obtain carboxylated cellulose nanocrystals（TCNC）;In situ synthesis of Cu NP on the surface of TCNC,carboxylated CNC/Cu NP（TCNC/Cu NP）hybrid materials with different structures were prepared.Then it was added to WPU to obtain TCNC/Cu NP modified WPU composite membrane.TCNC effectively improves the dispersion of Cu NP in WPU.Compared with pure WPU membranes,the prepared WPU nanocomposite membranes have better mechanical properties,scratch resistance and water resistance.In addition,when the TCNC/Cu NP ratio was 1:1,the antibacterial activity of WPU membrane against both E and S bacteria could reach 99.99%.（3）Using zinc acetate（（CH₃COO）₂Zn）and copper chloride（Cu Cl₂）as precursors,carboxylated CNC/Cu NP/Zinc oxide（TCNC/Cu NP/ZnO）ternary hybrid materials with different structures were synthesized in situ in TCNC suspension.Then they were added to the dispersion solution（WPU）to prepare the antibacterial coating slurry,the antibacterial coating was further finished on the PET fabric.The antibacterial property was tested.The results showed that when the ratio of hybrid material was 1:0.5:1,the antibacterial property of coated PET fabric reached 99.99%.After washing 40 times and wearing 2000 times,the coated fabric still had good antibacterial property.