Preparation Of Nitrogen Doped Carbon Quantum Dots And Its Application Research On Polyester Fabrics

Polyester fabric is widely used in textile field because of its high modulus,high strength and low price.However,in low humidity environment,polyester fabric is prone to generate static electricity and adsorb harmful bacteria in the air,which may pose a threat to human health and affect people's wearing experience,making it less comfortable to wear.Therefore,how to improve the antistatic and antibacterial property of polyester fabric and how to develop composite polyester fabric have always been the focus of industry research.Carbon quantum dots(CQDS),a new material with strong hydrophilicity,can be further modified to develop a new composite functional material with antistatic and antibacterial properties,which is expected to be applied to the functional finishing of polyester fabric and explore a feasible path for the integrated functional finishing of polyester fabric with antistatic and antibacterial properties.The main research contents and conclusions are as follows:(1)Preparation of N-CQDs.Using citric acid,glucose and 1-ascorbic acid as carbon sources and ethylenediamine as nitrogen sources,N-CQDs were prepared by hydrothermal and microwave methods.TEM,XRD,FT-IR and other test results showed that the small size N-CQDs were successfully synthesized and the amino group was successfully connected to the surface.Uv-vis and PL spectra showed that the N-CQDs prepared by hydrothermal method with citric acid as carbon source had strong ultraviolet absorption and fluorescence intensity,and the fluorescence quantum yield was the highest.The synthesis process of N-CQDs was optimized by orthogonal experiment.The results showed that the synthesized N-CQDs had the best antistatic effect when the temperature was 200?,the reaction time was 240 min,and the pH was 9(2)Optimization of antistatic finishing process of alkali-reduced polyester fabric by N-CQDs.Six technological conditions,such as concentration of nitrogen-doped carbon quantum dots,rolling rate,baking temperature,baking time,binder type and dosage,were optimized with the fabric electrostatic half-life as the evaluation index.Finally,the optimal finishing process was determined:the concentration of N-CQDs was 40 g/L,the pickup rate was 90%,the baking temperature was 100?,the baking time was 60 s,the adhesive was polyurethane F-2921E type,and the amount of adhesive was 20 g/L.The finished alkali-deweighting polyester fabric was tested for its anti-static washing resistance,friction resistance,uv resistance,breathability and moisture permeability,tensile breaking strength,drape and fabric style.The results show that the fabrics treated by the optimal process have good antistatic property,half-life 1.36s,and have the properties of washable and friction-resistant;The anti-ultraviolet effect is obviously improved,the permeability decreases slightly,the moisture permeability is improved,the fracture strength is improved and the style is slightly crisp.(3)Preparation and characterization of Ag/N-CQDs and research of their antistatic and antibacterial properties.Ag nanoparticles were introduced into the N-CQDs system,and the polyester fabric was functionally arranged through the optimal process to make it antibacterial and antistatic.Ag/N-CQDs were prepared by photoreduction in situ.The results of XRD,XPS,TEM and HRTEM-EDX show that Ag/N-CQDs have been successfully synthesized.Through the electrostatic half-life test,it was found that the antistatic synergistic effect was realized after the introduction of Ag nanoparticles,and through the bacteriostatic rate and bacteriostatic circle test,it was found that the introduction of Ag nanoparticles made the system achieve 99.9%antibacterial property.To sum up,In this paper,nitrogen-doped carbon quantum dots were prepared,and the polyester fabric was functionally treated to give it antistatic properties.Furthermore,nano Ag was introduced into the nitrogen-doped carbon quantum dot system to improve the antibacterial performance of polyester fabric and realize the synergistic effect of antistatic performance.A feasible way is explored for the industrialization development of antistatic and antibacterial composite multifunctional polyester fabric.