Liu Hechen, Wu Xuan, Guo Zhanpeng, Dong Peng, Ge Qi, Wei Liwei, Sun Zhanglin
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Yonghua North Street No. 619, Baoding 071003, China.
Hebei Key Laboratory of Green and Efficient New Electrical Materials and Equipment, North China Electric Power University, Yonghua North Street No. 619, Baoding 071003, China.
Polymers (Basel). 2022 Sep 15;14(18):3867. doi: 10.3390/polym14183867.
Epoxy resin insulation materials are mainly derived from petrochemical materials which have the disadvantages of resource consumption and environmental pollution. In order to cure bisphenol A epoxy resin, a maleopimaric anhydride (MPA) curing agent was prepared from rosin, a renewable resource, and blended with a petroleum-based curing agent (methylhexahy-drophthalic anhydride). The influence of maleopimaric anhydride content on the initiation and growth characteristics of electrical trees was studied and analyzed in this paper using molecular dynamics simulation (MD) and electrical tree tests at an 18-kilovolt power frequency voltage. When the MPA content used was ≤10%, the free volume percentage of the curing system increased with MPA content, and thus the initiation voltage became lower; when the MPA content was ≥20%, the hydrogenated phenanthrene ring structure content increased significantly with increasing MPA content, and the rigidity of the curing system increased significantly; thus, the initiation voltage gradually increased. MPA4 had an 11.11% higher initiation voltage than the petroleum-based control group. The effect of the polar rigid structure within the curing system significantly inhibited the growth rate and length of electrical trees as MPA content increased. Electrical trees developed into light-colored, thin, and narrow dendritic structures when the MPA content reached 40%. The results show that curing epoxy resin with the rosin-based curing agent maleopimaric anhydride (MPA), in place of a petroleum-based curing agent, can produce environmentally friendly resins with excellent electrical tree resistance and potential application prospects.
环氧树脂绝缘材料主要来源于石化材料，存在资源消耗和环境污染的缺点。为了固化双酚A环氧树脂，以可再生资源松香制备了马来海松酸酐（MPA）固化剂，并与石油基固化剂（甲基六氢苯酐）进行共混。本文采用分子动力学模拟（MD）和18kV工频电压下的电树试验，研究和分析了马来海松酸酐含量对电树引发和生长特性的影响。当MPA用量≤10%时，固化体系的自由体积分数随MPA含量的增加而增加，引发电压降低；当MPA含量≥20%时，氢化菲环结构含量随MPA含量的增加而显著增加，固化体系的刚性显著提高，引发电压逐渐升高。MPA4的引发电压比石油基对照组高11.11%。随着MPA含量的增加，固化体系中极性刚性结构的作用显著抑制了电树的生长速率和长度。当MPA含量达到40%时，电树发展为浅色、细而窄的树枝状结构。结果表明，用松香基固化剂马来海松酸酐（MPA）代替石油基固化剂固化环氧树脂，可以制备出具有优异耐电树性能和潜在应用前景的环保型树脂。
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