Epoxy chemistry for electrical insulation

Mechanical and Electrical Properties of Cycloaliphatic Epoxy/Silica Systems for Electrical Insulators for Outdoor Applications

“…Outdoor insulating bodies have conventionally been made of glass and porcelain materials and, recently, epoxy insulating materials have been introduced to substitute for conventional ceramic materials because epoxy materials as insulators have several advantages such as light weight, good water repellance, and resistance to pollution compared with those glass and porcelain materials [1][2][3]. Especially, cycloaliphatic epoxy families have been used for outdoor applications because aliphatic cyclic structures are superior to aromatic bisphenol structures in the resistance to UV radiation, carbon formation, and surface discharges.…”

“…The effect of humidity and pollutants can be addressed by reducing the wettability of the surface or increasing the repellency to moisture and humidity by imparting hydrophobicity. To increase hydrophobicity, water repellents, such as silicone oils, can be introduced into the epoxy system [5,6].…”

Effect of Silicone-modified Microsilica Content on Electrical and Mechanical Properties of Cycloaliphatic Epoxy/Microsilica System

“…Specifically, cycloaliphatic epoxy families have been used for outdoor applications because aliphatic cyclic structures are superior [1]to aromatic bisphenol structures in the resistance to UV radiation, carbon formation and surface discharges. The inherent low viscosity of these aliphatic cyclic epoxies enables them to be formulated with high levels of inorganic fillers [6].…”

“…Epoxy resins were the first polymers used as substitutes for conventional ceramic materials in applications such as mold-type transformers, current transformers (CT), potential transformers (PT), metering out-fit (MOF), and gas switching gears since mid-1940s [1][2][3]. These materials are still used to make electrical insulators for indoor and outdoor applications because they have good mechanical and thermal properties as well as excellent electrical properties [4,5].…”

Cure Kinetics of Cycloaliphatic Epoxy/Silica System for Electrical Insulation Materials in Outdoor Applications

“…Epoxy resins were the first polymers used for electrical equipments, such as mold-type transformers, current transformers (CT), potential transformers (PT), metering out-fit (MOF), and gas switching gears in the fields of solid electrical insulators since the mid-1940s, and are still used to make electrical insulators for indoor and outdoor applications [1][2][3]. This was because they have good mechanical and thermal properties as well as excellent electrical properties [4,5].…”