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APPLICATION OF A SILICONE COMPOSITION CROSSLINKED BY WAY OF A CATIONIC PROCESS IN PRESENCE OF UV RADIATION AND A PHOTOINITIATOR OF ONIUM BORATE TYPE FOR COATING FLAT GASKETS IN PARTICULAR THOSE FOR CYLINDER HEADS
APPLICATION OF A SILICONE COMPOSITION CROSSLINKED BY WAY OF A CATIONIC PROCESS IN PRESENCE OF UV RADIATION AND A PHOTOINITIATOR OF ONIUM BORATE TYPE FOR COATING FLAT GASKETS IN PARTICULAR THOSE FOR CYLINDER HEADS
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机译：阳离子过程交联的有机硅组合物在紫外线辐射和硼酸钾型光引发剂用于涂覆汽缸盖的烟灰缸中的应用
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摘要
The invention concerns the use of cross-linkable silicone compositions for fast, economical and simple impregnation and/or varnishing of flat joints (e.g. cylinder head gaskets). More precisely it concerns the use of silicone compositions cross-linkable under UV radiation, by cationic process and in the presence of specific phoinitiators selected among onium borates or organometallic complexes, of which the borate counter-anions contain at least a boron bound to at least a substituted phenyl (Me, F). The silicone liquid precursor is a polydimethylsiloxane (PDMS) substituted by cross-linking functional groups, by cationic process (Gfp) under UV of the epoxy or vinyloxy type. These Gfp are present at the rate of 0.15 to 2.0 pr kg of PDMS. The invention also relates to the method for impregnating/varnishing flat joints (e.g. cylinder head gaskets) using the specific PDMS composition+photoinitiator of borate type as well as the treated joints and the composition themselves.
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