Einfluss stofflicher Modifikationen auf die dynamische Hydrophobie von Silikonelastomeren für den Hochspannungs-Freilufteinsatz

In 2015 an AiF funded research project was completed to evaluate dynamic hydrophobic properties of polymeric insulating materials for high-voltage outdoor application. Based on these results the two specified test methods are chosen in this contribution to optimize silicone elastomers with respect to their dynamic hydrophobic properties “retention” and “transfer”. The effects of filler level and treatment are investigated for aluminium trihydrate, which is often used in high-temperature cured silicone rubber. In addition, results on the influence of the silicone rubbers' curing method as well as the addition of supplementary low molecular weight components are presented. Similar effects on the retention and transfer of hydrophobicity are observed for the investigated material modifications. As expected, the filler level and the filler treatment of aluminium trihydrate seem to have the highest influence on the dynamic hydrophobic properties.