Preparation of Polyurethane-Modified Silicone Rubber Insulating Coating and Its Application in 10 kV Overhead Bare Wire Wrapping

Room-temperature vulcanized rubber is an excellent polymer material with electrical insulation and mechanical properties, which can be used for field of high-voltage bare wire. In this paper, a room-temperature cured coating was prepared from α,ω-dihydroxy polydimethylsiloxane (PDMS), polyurethane-modified silicone (PU-Si), Methyltris(methylethylketoxime) silane (MOS). The study showed that the made by adding PDMS (70 g), PU-Si (30 CaCO3 (90 MOS (7 KH792 (5 Mg(OH)2 g) had surface drying time 19.1 min, tensile strength 3.2 Mpa, volume resistivity greater than 4 × 1014 Ω·cm, breakdown voltage 20 kV/mm, flame retardant performance FV-1 level. comprehensive meets national standard “Aerial insulated cables rated 10 kV” (GB/T14049-2008), while has been successfully applied to overhead line renovation project State Grid Hubei Electric Power Company (Wuhan, China).