| abstract |
A high dielectric insulating silicone rubber composition and an electric field relaxation layer are provided. A high-dielectric insulating silicone rubber composition, characterized in that the high-dielectric insulating silicone rubber composition contains: (A) an organopolysiloxane represented by the following formula (1): 100 parts by mass, R 1 n SiO (4-n)/2 (1) (in the formula, R 1 is the same or different unsubstituted or substituted monovalent hydrocarbon group, and n is a positive number from 1.95 to 2.04.); (B) Average primary particle size Thermal carbon black with a thickness of 150 to 500 nm: 60 to 150 parts by mass; (C) Reinforcing fumed silica with a specific surface area of 50 m 2 /g or more obtained by the BET adsorption method: 5 to 100 parts by mass; ( D) Curing agent: 0.1-10 parts by mass, the relative dielectric constant of the cured product satisfies 10 or more, the volume resistivity satisfies 1.0×10 13 ～1.0×10 17 Ω·cm, the dielectric loss tangent satisfies 0.1 or less, and the insulation The breaking strength (BDV) satisfies 7kV/mm or more. |