HEAT CURABLE SILICONE RUBBER COMPOSITION

摘要

There is provided a silicone rubber composition whose compression set in a higher temperature range, particularly at 200° C. or higher, in a silicone rubber to be obtained is sufficiently suppressed. A heat curable silicone rubber composition contains: (A) 100 parts by mass of a polyorganosiloxane having an average degree of polymerization of 500 to 20,000 and having two or more alkenyl groups in a molecule; (B) 5 to 100 parts by mass of a filler; (C) an effective amount of an organic peroxide; and (D) 0.06 to 15 parts by mass of a hydrous cerium oxide and/or a hydrous zirconium oxide each having one absorption band in 3300 to 3500 cm−1 and two or more absorption bands in 1300 to 1700 cm−1 in infrared absorption spectrum measurement.

主权项

1. A heat curable silicone rubber composition, comprising:
(A) 100 parts by mass of an alkenyl group-containing polyorganosiloxane expressed by a following general formula (1), having an average degree of polymerization of 500 to 20,000, and having two or more alkenyl groups in a molecule,where R1 represents an unsubstituted or substituted monovalent hydrocarbon group containing no aliphatic unsaturated group, R2 represents an alkenyl group, R3 represents a monovalent group indicating R1 or R2, or hydroxyl group independently, n and m represent the total numbers of each recurring units obtained by random polymerization or block polymerization, and n+m+2 obtained by adding 2 that is the number of terminal groups to n and m represents an average degree of polymerization;
(B) 5 to 100 parts by mass of a filler; (C) an effective amount of an organic peroxide; and (D) 0.06 to 15 parts by mass of a hydrous oxide selected from the group consisting of a hydrous cerium oxide and a hydrous zirconium oxide each having one absorption band in 3300 to 3500 cm−1 and two or more absorption bands in 1300 to 1700 cm−1 in infrared absorption spectrum measurement.