초록 ▼

A silicone rubber composition comprising (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups attached to a silicon atom, (B) finely divided silica, (C) aluminum hydroxide surface treated with silazanes, (D) an organohydrogenpolysiloxane having at least two hydrogen

A silicone rubber composition comprising (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups attached to a silicon atom, (B) finely divided silica, (C) aluminum hydroxide surface treated with silazanes, (D) an organohydrogenpolysiloxane having at least two hydrogen atoms attached to a silicon atom, and (E) a platinum catalyst is suitable for use as a high-voltage electrical insulator. The silicone rubber has durable high-voltage electrical insulating properties and is firmly bondable to core materials.

대표청구항 ▼

A silicone rubber composition for use as a high-voltage electrical insulator comprising (A) 100 parts by weight of an organopolysiloxane of the following average compositional formula (1): R1aR2bSiO(4-a-b)/2(1) wherein R1 is a halo-substituted or unsubstituted aliphatic unsaturated monovalent hydroc

A silicone rubber composition for use as a high-voltage electrical insulator comprising (A) 100 parts by weight of an organopolysiloxane of the following average compositional formula (1): R1aR2bSiO(4-a-b)/2(1) wherein R1 is a halo-substituted or unsubstituted aliphatic unsaturated monovalent hydrocarbon group, R2 is a halo-substituted or unsubstituted monovalent hydrocarbon group free of an aliphatic unsaturated bond, and letters a and b are positive numbers in the range: 01, 1≤b 3, and 13, said organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups each attached to a silicon atom in a molecule, (B) 1 to 100 parts by weight of finely divided silica based on 100 parts by weight of (A), (C) 50 to 300 parts by weight of surface treated aluminum hydroxide based on 100 parts by weight of (A), wherein the aluminum hydroxide is of the formula Al2O3hu .3HO2O, (D) an organohydrogenpolysiloxane of the following average compositional formula (2): R3cHdSiO(4-c-d)/2 (2) wherein R3 is a halo-substituted or unsubstituted monovalent hydrocarbon group exclusive of an aliphatic unsaturated group, and letters c and d are positive numbers in the range: 1≤c3, 01, and 13, said organohydrogenpolysiloxane having at least two hydrogen atoms each attached to a silicon atom in a molecule, in a sufficient amount to provide 0.5 to 20 mol of the silicon atom-attached hydrogen atom per mol of the aliphatic unsaturated hydrocarbon group in component (A) , and (E) a catalytic amount of a platinum group catalyst.