NEW MODIFIED SILICON OIL FOR LOW TEMPERATURE CURE DIE CASTING LUBRICANTS

摘要

The present invention relates to a mixture of polyalkylsiloxanes that cure at temperatures of about 170° C. while being unreactive under ambient conditions during storage or transport and which are obtained through a hydrosilylation reaction wherein a mixture of ethylenically unsaturated olefins consisting of 1-100% of one or more polyene(s), and 0-99 mol % of monounsaturated olefins with 6 to 15 carbon atoms is reacted with an amount of one or more polyalkylhydrosiloxanes in the presence of a hydrosilylation catalyst. Furthermore, the present invention relates to water-based compositions suitable for use in metal casting processes as a mold release agent comprising a mixture of polyalkylsiloxanes of the invention and a non-ionic surfactant. In addition, the present invention relates to the use of the polyalkylsiloxanes and mixtures of polyalkylsiloxanes as defined herein.

主权项

1. A mixture of polyalkylsiloxanes obtained through a hydrosilylation reaction wherein a mixture of ethylenically unsaturated olefins consisting of:
a) 1-100 mol % of one or more polyene(s) having one terminal double bond, which is either monosubstituted or geminal disubstituted, and one or more tri- or tetrasubstituted double bond(s); and b) 0-99 mol % of monounsaturated olefins with 6 to 15 carbon atoms;is reacted with an amount of one or more polyalkylhydrosiloxanes in the presence of a hydrosilylation catalyst while each polyalkylhydrosiloxane comprises a repeating unit according to the general structure (I):with n indicating the number of repeating units being in a range of from 5 to 10,000; with the residue R1 being selected from linear or branched alkyl groups with less than 6 carbon atoms.