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Study on thermal-mechanical-electrical properties of composite epoxy resin and its hydrothermal ageing resistance mechanism
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Hechen Liu1, 2, Shuyue Nan1, *, Yuli Wang1, 2, Haibo Ma1, 2, Nana Xue3, Qingjun Zhang3, Wenhao Tian1, 2, Junbo Men1, 2
Insulating Materials | 2026, 59(8) : 58 - 68
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Insulating Materials | 2026, 59(8): 58-68
• Insulation Technology •
Study on thermal-mechanical-electrical properties of composite epoxy resin and its hydrothermal ageing resistance mechanism
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Hechen Liu1, 2, Shuyue Nan1, *, Yuli Wang1, 2, Haibo Ma1, 2, Nana Xue3, Qingjun Zhang3, Wenhao Tian1, 2, Junbo Men1, 2
Affiliations
  • 1Yanzhao Electric Power Laboratory, North China Electric Power University, Baoding 071003, China
  • 2Hebei Provincial Key Laboratory of Green and Efficient New Electrical Materials and Equipment, North China Electric Power University, Baoding 071003, China
  • 3Zhejiang Qiyi Electric Co., Ltd., Kaihua 324300, China
Published: 2026-08-20 doi: 10.16790/j.cnki.1009-9239.im.2026.08.007
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To explore the effect law of hydrothermal ageing on performances of epoxy resin, a hygrothermal resistant epoxy resin was prepared by blending highly reactive and thermally stable glycidylamine-type multifunctional epoxy resin (TGDDM) with bisphenol A-type epoxy resin (DGEBA) according to different mass rations in this paper. Different samples were subjected to 100℃ boiling water ageing experiments, and the performance degradation of the blended epoxy resin system and traditional epoxy resin system before and after ageing was analyzed from microscopic and macroscopic levels. Additionally, the mechanisms underlying the hydrothermal resistance of blended epoxy resin systems was analyzed by MS molecular dynamics simulation. The results show that when the mass ratio of DGEBA to TGDDM is 2∶1, the thermal-mechanical-electrical properties of D-MLB-2 system are better than those of traditional epoxy resins. Its glass transition temperature (Tg) is 174.2℃, the bending strength is 107.26 MPa, and the electric strength is 44.0 kV/mm. After 8 days of ageing, the Tg, bending strength, electric strength, and dielectric loss factor retention rate of the D-MLB-2 system are better than those of the conventional epoxy resin system. This research provides a theoretical basis for the development of hydrothermal resistant insulating materials and the exploration of hydrothermal ageing mechanisms.

blending modification  /  hydrothermal resistance  /  epoxy resin  /  water boiling ageing
Hechen Liu, Shuyue Nan, Yuli Wang, Haibo Ma, Nana Xue, Qingjun Zhang, Wenhao Tian, Junbo Men. Study on thermal-mechanical-electrical properties of composite epoxy resin and its hydrothermal ageing resistance mechanism[J]. Insulating Materials, 2026 , 59 (8) : 58 -68 . DOI: 10.16790/j.cnki.1009-9239.im.2026.08.007
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Year 2026 volume 59 Issue 8
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2026.08.007
  • Receive Date：2025-08-14
  • Online Date：2026-09-10
  • Published：2026-08-20
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History
  • Received：2025-08-14
  • Revised：2025-11-06
Affiliations
    1Yanzhao Electric Power Laboratory, North China Electric Power University, Baoding 071003, China
    2Hebei Provincial Key Laboratory of Green and Efficient New Electrical Materials and Equipment, North China Electric Power University, Baoding 071003, China
    3Zhejiang Qiyi Electric Co., Ltd., Kaihua 324300, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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