Improvement in Toughness of Epoxy Casting Materials by Filling Silica and Silicone Gel

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  • SHIMIZU Toshio
    Power and Industrial Systems Research and Development Center, Industrial and Power Systems and Services Company, Toshiba Corporation
  • HIRANO Yoshihiko
    Power and Industrial Systems Research and Development Center, Industrial and Power Systems and Services Company, Toshiba Corporation
  • MIYAGAWA Masaru
    Switchgear Department, Industrial and Power Systems and Services Company, Toshiba Corporation

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Other Title
  • シリカおよびシリコーンゲル充填によるエポキシ注型材料の靭性向上
  • シリカ及びシリコーンゲル充填によるエポキシ注型材料の靭性向上
  • シリカ オヨビ シリコーン ゲル ジュウテン ニ ヨル エポキシ チュウケイ ザイリョウ ノ ジンセイ コウ ジョウ

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Description

Epoxy casting materials are used widely in heavy apparatus because of their excellent mechanical and electrical properties. However, epoxy resins are very brittle and their resistance to thermal shock is poor generally. In this study, the modification of an anhydride-cured epoxy resin system with rigid silica particles or a flexible silicone gel was investigated to improve the toughness. The addition of either the modifier into the epoxy system was effective to increase the fracture toughness of the cured resin. The diameter of the silicone gel in the cured epoxy resin was successfully controlled by use of silicone oil as an additional modifier. More effective modification of the resin was attained in the hybrid system, in which both the fillers were added together into the resin system. Such an epoxy resin system modified with the hybrid fillers was suitable as casting materials : the resin system has good flow properties before curing, and has excellent adhesive and insulating properties as well as high fracture toughness after curing.

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