| Substation and transmission line conductors often generate corona discharges,and traditional acrylic conductive coatings are easily damaged during the violent shaking of UHV substation conductors due to the inherent brittleness of acrylic resin,which greatly limits their application.In this paper,acrylic resin is used as the substrate,and the conductive ability and mechanical toughness of the material are improved by adding carbon fiber powder,multiwalled carbon nanotubes,and other conductive fillers,and the hydrophobicity of the material is improved by using titanium dioxide nanoparticles as a self-cleaning agent,and a UHV anticorona acrylic-based composite coating is prepared after extended flow air-drying,and its physical and chemical properties are systematically analyzed.Firstly,in this paper,an anti-corona conductive coating for UHV was prepared by using carbon fiber powder and multi-walled carbon nanotubes as conductive fillers and titanium dioxide nanoparticles as self-cleaning agents added to a thermoplastic acrylic resin matrix.The microscopic morphology,mechanical properties,electrical conductivity,hydrophobic properties,and a heat resistance of the conductive coating were tested and characterized by SEM,Instron,four-probe tester,contact angle meter,and TG.The results show that carbon fiber powder and multi-walled carbon nanotubes can significantly reduce the bulk resistance of acrylic resin,while carbon nanotubes play a major role in enhancing the toughness of acrylic resin,and titanium dioxide nanoparticles enhance the self-cleaning ability of acrylic resin.The bulk resistance and surface resistance of the acrylic composite coatings reached 0.8 Ω-cm and83.2 Ω-cm,respectively,and the modulus of elasticity,tensile strength,and elongation at break reached 5.5 GPa.at 50 wt%,2 wt%,and 1 wt% filling of carbon fiber powder,carbon nanotubes,and titanium dioxide nanoparticles,12.4 and 1.1%,and the contact angle reached 103.7°.Secondly,the mechanism of the influence of different component fillers on the performance of acrylic conductive composite coatings was clarified by changing the blending parameters.The ratios of carbon fiber and acrylic resin were divided into four groups by 30%,40%,50%,60%,and multi-walled carbon nanotubes were divided into three groups by 0,2wt%,5wt% for orthogonal experiments to prepare different ratios of acrylic conductive coatings and analyze the influencing factors of each performance.The results showed that the increase in the proportion of carbon fiber effectively increased the tensile strength and electrical conductivity of the composite coating,the increase in the multi-walled carbon nanotubes increased the toughness and electrical conductivity of the composite coating,the hydrophobic properties were not significantly related to the number of conductive fillers added,and the heat resistance was not related to the proportion of all fillers added.Finally,this paper analyzed the surface morphology,mechanical properties,electrical conductivity,hydrophobic properties,and molecular structure of acrylic conductive coatings with different ratios by UV aging test chamber for 72 h.The results showed that the surface morphology of the composite coatings changed slightly after UV aging,the tensile properties decreased slightly,the electrical conductivity did not change significantly,the hydrophobic properties improved significantly,and the molecular structure did not change significantly,which demonstrate that the prepared composite coatings have good UV aging resistance. |
