additionsvernetzende siliconkautschukmischungen, a method for their production, process for producing composite molded parts and the use of the siliconkautschukmischungen

摘要

An addition cross-linkable silicon rubber mixture comprises an alkenyl group containing linear or branched organopolysiloxane having at least 2 alkenyl groups and a viscosity of 0.001-30,000 Pas, a hydrogen polysiloxane having at least 2 Si-H groups per molecule and a Pt- or Rh- catalyst, a mixture of glycidoxypropyltrimethoxysilane and methacryloxypropyltrimethoxysilane and a peroxide. An addition cross-linkable silicon rubber mixture (I) comprises: (A) 100 pts. of an alkenyl group containing linear or branched organopolysiloxane having at least 2 alkenyl groups and a viscosity of 0.001-30,000 Pas; (B) a hydrogen polysiloxane; (C) a Pt- or Rh- catalyst and optionally an inhibitor; (D) 0.1-20 pts. of a mixture of glycidoxypropyltrimethoxysilane and methacryloxypropyltrimethoxysilane; (E) 0-200 pts. of a filler, optionally surface modified; (F) processing aids; and (G) peroxide whereby the hydrogen siloxane (B) has at least 2 Si-H groups per molecule and the molar ratio of all SiH groups to the total amount of Si-bonded alkenyl groups is at least 1.0. Independent claims are also included for: (i) a process for the preparation of the rubber mixture (I) by mixing (A) and (E) followed by the addition of further (A), (B), (C), (D) and optionally (F) and (G); (ii) a process for the production of a composite molded article from the rubber mixture (I) by preparing a first mixture of (A), catalyst (C) and optionally (E) and/or (F) and a second mixture of (A), (B), (D) and optionally (E), (F) and/or inhibitor (C).