Biomimetic superhydrophobic(SH)coatings have emerged as a promising alternative to traditional room temperature vulcanizing(RTV)silicone rubber coatings for improving the flashover strength of insulators.However,organ...Biomimetic superhydrophobic(SH)coatings have emerged as a promising alternative to traditional room temperature vulcanizing(RTV)silicone rubber coatings for improving the flashover strength of insulators.However,organic contamination occurs in outdoor applications and thus a superamphiphobic(SAP)surface is more desirable but not yet reported for improving flashover performance.Herein,we developed a novel anti-flashover technique by fabricating robust SAP coating with unique gradient and micro-nanoscale hierarchical architecture.The SAP coating was fabricated by sequentially spray-depositing a resin-based primer and a silica-based topcoat on substrates(i.e.,glass slides and insulators).The primer not only functions as an adhesive offering strong adhesion to the substrate but also offers a micromastoid-like structure facilitating the subsequent formation of hierarchical micro-nanostructure.The appropriate spraying pressure leads to a diffusion of the fluorocarbon-modified silica nanoparticles into the primer to form a unique gradient structure,by analogy to inserting bullets into a wood.These features render the SAP coating excellent robustness with strong abrasive resistance,excellent ultraviolet(UV)resistance,and excellent chemical and thermal stability.Pollution flashover property of the SAP coating was explored and compared with that of SH and RTV specimens,from which a novel organic-contamination model to evaluate the flashover performance was proposed.The coated SAP glass insulator demonstrated 42.9%pollution flashover voltage improvement than RTV-coated insulator.These stated unique features reveal the convincing potential of the present SAP coatings to be applied for not only outdoor transmission line insulators for antiflashover but also other fields for self-cleaning,anti-fouling,and anti-icing.展开更多
为了解决室温硫化硅橡胶(RTV)防污闪涂料长期使用中表面积累大量污秽的问题,提出了一种具有自洁性的新型防污闪硬质涂料SCHC(self-cleaning hard coating)。实测和分析了长期使用的RTV涂层表面的污秽密度后,用小玻璃球法比较了SCHC涂层...为了解决室温硫化硅橡胶(RTV)防污闪涂料长期使用中表面积累大量污秽的问题,提出了一种具有自洁性的新型防污闪硬质涂料SCHC(self-cleaning hard coating)。实测和分析了长期使用的RTV涂层表面的污秽密度后,用小玻璃球法比较了SCHC涂层和RTV涂层的自洁性能差异,用静态接触角法和喷水分级法研究了SCHC涂层的憎水性、憎水性丧失与恢复特性、憎水迁移性能。结果显示,和RTV涂层相比,SCHC涂层对于微小污秽颗粒具有显著的降低吸附的功能,其憎水性优于RTV涂层,憎水性迁移性能和RTV同等,且憎水性受长期高湿环境的影响很小。因此,SCHC涂层能够在长期使用中显著的降低绝缘子表面污秽的积累,能够有效地防范污闪的发生。展开更多
基金the project“Synthesis and Application of Superhydrophobic Self-cleaning Materials for Electric Engineering”(No.6111901321)Overseas Expertise Introduction Project(111 project)for Discipline Innovation of China(No.B18038)the State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology)Open Foundation(No.SYSJJ2021-02).
文摘Biomimetic superhydrophobic(SH)coatings have emerged as a promising alternative to traditional room temperature vulcanizing(RTV)silicone rubber coatings for improving the flashover strength of insulators.However,organic contamination occurs in outdoor applications and thus a superamphiphobic(SAP)surface is more desirable but not yet reported for improving flashover performance.Herein,we developed a novel anti-flashover technique by fabricating robust SAP coating with unique gradient and micro-nanoscale hierarchical architecture.The SAP coating was fabricated by sequentially spray-depositing a resin-based primer and a silica-based topcoat on substrates(i.e.,glass slides and insulators).The primer not only functions as an adhesive offering strong adhesion to the substrate but also offers a micromastoid-like structure facilitating the subsequent formation of hierarchical micro-nanostructure.The appropriate spraying pressure leads to a diffusion of the fluorocarbon-modified silica nanoparticles into the primer to form a unique gradient structure,by analogy to inserting bullets into a wood.These features render the SAP coating excellent robustness with strong abrasive resistance,excellent ultraviolet(UV)resistance,and excellent chemical and thermal stability.Pollution flashover property of the SAP coating was explored and compared with that of SH and RTV specimens,from which a novel organic-contamination model to evaluate the flashover performance was proposed.The coated SAP glass insulator demonstrated 42.9%pollution flashover voltage improvement than RTV-coated insulator.These stated unique features reveal the convincing potential of the present SAP coatings to be applied for not only outdoor transmission line insulators for antiflashover but also other fields for self-cleaning,anti-fouling,and anti-icing.
文摘为了解决室温硫化硅橡胶(RTV)防污闪涂料长期使用中表面积累大量污秽的问题,提出了一种具有自洁性的新型防污闪硬质涂料SCHC(self-cleaning hard coating)。实测和分析了长期使用的RTV涂层表面的污秽密度后,用小玻璃球法比较了SCHC涂层和RTV涂层的自洁性能差异,用静态接触角法和喷水分级法研究了SCHC涂层的憎水性、憎水性丧失与恢复特性、憎水迁移性能。结果显示,和RTV涂层相比,SCHC涂层对于微小污秽颗粒具有显著的降低吸附的功能,其憎水性优于RTV涂层,憎水性迁移性能和RTV同等,且憎水性受长期高湿环境的影响很小。因此,SCHC涂层能够在长期使用中显著的降低绝缘子表面污秽的积累,能够有效地防范污闪的发生。
