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Study on Blending Modification of Bisphenol A Epoxy.

Xiaotao Fu1, Long Ma1,2, Lincong Chen1

  • 1Key Laboratory of Physical and Chemical Analysis for Electric Power of Hainan Province, Hairui Road No. 23, Haikou 570100, China.

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Modified epoxy resins show enhanced performance for composite insulator cross arms. Blends with aliphatic epoxy (2021P) and dimeric acid (EPD) improved thermo-mechanical and electrical properties, increasing aging resistance in harsh environments.

Keywords:
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrical Engineering

Background:

  • Epoxy-resin-based composites are crucial electrical materials but degrade under high temperature, humidity, and salt spray.
  • Ensuring the operational reliability of composite insulator cross arms requires understanding resin aging mechanisms and performance characteristics.

Purpose of the Study:

  • To evaluate the aging resistance and performance of modified epoxy resin systems for composite insulator cross arms.
  • To analyze the effects of wet heat and salt spray aging on blended epoxy resins.

Main Methods:

  • Wet heat aging and salt spray aging experiments were conducted on epoxy resin blends.
  • The blends included bisphenol A epoxy resin (E-51) modified with aliphatic epoxy (2021P) and dimeric acid (EPD).
  • Thermo-mechanical properties, dielectric loss, leakage current, and bending strength were measured.

Main Results:

  • 10 wt% 2021P and 10 wt% EPD blends exhibited superior thermo-mechanical properties.
  • EPD blends showed significantly lower dielectric loss (up to 74.6% reduction) after aging compared to pure E51 resin.
  • Leakage current decreased in 2021P and EPD blends, and bending strength remained high for 2021P blends.

Conclusions:

  • Modified epoxy resin systems (2021P and EPD blends) demonstrate strong aging resistance and excellent electrical and mechanical properties.
  • These enhanced epoxy resins are suitable matrix materials for composite cross arm mandrels operating in challenging environments.