Hygrothermal Aging Characteristics and Life Prediction of Epoxy Resin

ZHANG Guoping; FAN Weinan; DU Gang; WANG Yong; LI Guangmao; WANG Xilin; JIA Zhidong

doi:10.13296/j.1001-1609.hva.2025.12.023

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Hygrothermal Aging Characteristics and Life Prediction of Epoxy Resin

Research & Analysis | 更新时间：2025-12-09

- Hygrothermal Aging Characteristics and Life Prediction of Epoxy Resin
- High Voltage Apparatus Vol. 61, Issue 12, Pages: 168-174(2025)
- 作者机构：
  
  清华大学深圳国际研究生院，广东深圳 518131
  广东电网有限责任公司广州供电局电力试验研究院，广州 510410
- 作者简介：
- 基金信息：
  
  China Southern Power Grid Key Science and Technology Program(GZHKJXM20190110)
- DOI：10.13296/j.1001-1609.hva.2025.12.023
  CLC：
- Received：13 April 2025，
  
  Revised：2025-07-08，
  
  Published：16 December 2025
- 稿件说明：
移动端阅览
ZHANG Guoping, FAN Weinan, DU Gang, et al. Hygrothermal Aging Characteristics and Life Prediction of Epoxy Resin[J]. High Voltage Apparatus, 2025, 61(12): 168-174.
DOI：

ZHANG Guoping, FAN Weinan, DU Gang, et al. Hygrothermal Aging Characteristics and Life Prediction of Epoxy Resin[J]. High Voltage Apparatus, 2025, 61(12): 168-174. DOI： 10.13296/j.1001-1609.hva.2025.12.023.

摘要

环氧树脂由于其优异的绝缘密封性能被广泛应用于干式空心电抗器，然而在湿热环境中环氧树脂易吸水受潮导致材料性能劣化，严重影响设备的安全稳定运行，有效的寿命预测方法或技术对于提高设备可靠性、减少经济损失具有重要意义，因此文中研究了基于活化能的环氧树脂寿命预测方式。首先对环氧树脂材料进行湿热老化，研究老化前后表面样貌和化学结构的变化，实验发现老化后环氧树脂表面出现许多微孔，吸收电流和极化电荷均随吸水率的增大而增大，老化过程中环氧树脂发生酯基的水解；接着用Kissinger法和Flynn-Wall-Ozawa法求取老化过程中材料活化能变化和化学反应机理函数，结果表明老化过程中化学活化能在逐渐减小，材料的热稳定性在逐渐降低，化学反应级数

=1；最后以质量损失达到起始值的3%作为失效判据，基于活化能对湿热老化后的环氧树脂进行了寿命预测，预测环氧树脂在50、75、95℃中湿热老化800 h后在50℃的使用条件下剩余使用寿命分别为25、18、10 a。

Abstract

Epoxy resin is widely used in dry-type air core reactor due to its excellent insulation and sealing performance. However

epoxy resin in hygrothermal environmentis prone to moisture absorption

resulting in material performance degradation and seriously compromising the safe and stable operation of equipment. Effective life prediction methods or technologies are of great significance for improving equipment reliabi

lity and reducing economic losses. Therefore

in this paper the life prediction method of epoxy resin based on activation energy is studied. First

the epoxy resin material is subjected tohygrothermal aging

and the variation of surface morphology and chemical structure before and after aging are studied. It is found by experiment that there are many micropores on the surface of the epoxy resin after aging

both absorption current and polarization charge are increased with the increase of water absorptionand the ester group of the epoxy resin is hydrolyzed during aging. Then

the varition of the activation energy and the chemical reaction mechanism function of the material during the aging process are obtained by Kissinger method and Flynn-Wall-Ozawa method. The results show that the chemical activation energy decreases gradually during the aging process

the thermal stability of the material decreases gradually

and the chemical reaction order is

=1. Finally

with a mass loss of 3%of the initial value as the failure criterion

the service life of the epoxy resin after hygrothermal aging is predictedbased on the activation energy. The remaining service life of the epoxy res-in after 800 of hygrothermal aging at 50℃

75℃and 95℃is predicted to be 25 a

18 a and 10 a respectively.

关键词

Keywords

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