Study On The Method Of Dispersing Carbon Nanotubes In Epoxy Resin

Carbon nanotube is one of the carbon group elements with unique structure and properties, making it one of the ideal materials for polymer filling and modifying. Epoxy resin is a polymer having excellent properties and wide applications, however, the fatigue resistance, heat resistance and impact resistance of it is poor, and using carbon nanotubes to modify epoxy resin can prepare composites having a very excellent performance, moreover, the composites combine the advantages of both and gives full play to their excellent performance. Since carbon nanotubes are easy to aggregate, making it difficult to disperse in the preparation of the combine, and making it a difficult problem when preparing carbon nanotubes/epoxy resin composites. At present, many researchers have prepared carbon nanotubes/epoxy resin composites by different methods, however, methods which can be used for industrialization, mass production and can achieve good carbon nanotube dispersion are less. This paper is aimed at industrial production and studying the processing conditions and equipment used to prepare nanocomposites by dispersing carbon nanotubes into epoxy resin. When using ultrasonic to disperse carbon nanotubes, the solvent dilution ultrasonic method and solvent-free ultrasonic method are used for epoxy resin matrix with different viscosity respectively. When using solvent ultrasonic dispersion method to disperse carbon nanotubes, the factors that affect the dispersion of carbon nanotubes including the ultrasonic power, ultrasonic treatment time, ultrasonic pulse and the amount of ultrasonic material were studied. The results show that increasing the ultrasonic power and prolonging the ultrasonic treatment time in a certain range can improve the dispersing effect of the carbon nanotubes. Similarly, using a suitable pulse processing can also improve the dispersion of carbon nanotube. However, the processing capability of each ultrasonic device is limited. When the amount of the processed material exceeds the processing capacity, the dispersion of carbon nanotube turns bad. The solvent-free ultrasonic method puts forward higher requirements for ultrasonic equipment; therefore, specially improved ultrasonic equipment is needed. The improved ultrasonic equipment is used to study the dispersion of carbon nanotubes by changing the ultrasonic process parameters. Finally, based on the experimental results of the improved ultrasound equipment, large capacity ultrasonic dispersion device is designed to achieve the mass dispersion of carbon nanotubes.When using a double-rotor mixer to disperse carbon nanotubes into epoxy resin, the mixing speed, mixing time and operation process of mixing will affect the dispersion of the carbon nanotubes. The experimental results of the study show that increasing the mixing speed and mixing time within a certain range can improve the dispersion and distribution performance of carbon nanotubes. The mixing speed mainly affects the dispersion of carbon nanotubes, while the mixing time mainly affects the distribution of carbon nanotubes, and the operation process of mixing have a certain influence on the uniformity and dispersion of the material.