Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Under arc discharge, the OMMT and Pt-NS system synergistically promtoed the organic-to-inorganic conversion of the silicone rubber matrix into a dense, ceramic-like barrier layer. This effectively suppresses the initiation and propagation of tracking, thereby enhancing the tracking resistance of silicone rubber.

ABSTRACT
Superior tracking resistance is essential for the long-term service of silicone rubber insulation material in outdoor applications. A tracking-resistant silicone rubber was prepared by incorporating a small amount of organic-modified montmorillonite (OMMT) in the silicone rubber with a platinum-nitrogen (Pt-NS) system consisting of Karsted's catalyst (Pt) and aminopropyltriethoxysilane (NS). At contents of 0.5 phr OMMT, 15 ppm Pt, and 2.0 phr NS, the silicone rubber composite achieved a tracking resistance grade of 1A4.5 level with 0.48% eroded mass. Under arc discharge, the Pt-NS system promoted surface ceramization of silicone rubber, with OMMT lamellae enhancing the density of the ceramic-like barrier, thereby significantly improving its tracking resistance. This work provides an effective strategy for improving the reliability of high-voltage insulating silicone rubber.