干式空心电抗器用环氧玻璃纤维复合材料协同增韧改性及性能研究

Study on synergistic toughening modification and performance of epoxy glass fiber composite materials for dry-type air-core reactor

为了提高干式空心电抗器包封绝缘材料的抗开裂性能,需要在保证环氧复合材料良好电气性能的同时提高其韧性。本文通过向环氧玻璃纤维(EP/GF)复合材料中加入不同含量的端环氧基液体丁腈橡胶(ETBN)、不同含量和不同粒径的Al_(2)O_(3)粉体,得到一种兼顾良好力学性能和电气性能的环氧玻璃纤维复合材料,并对其结构形貌、力学性能和电学性能进行测试。结果表明:当添加质量分数为10%的ETBN、质量分数为30%的5μm Al_(2)O_(3)和质量分数为3%的100 nm Al_(2)O_(3)时,复合材料的弯曲强度最高达到291.0 MPa,比未添加填料时提升了33.5%,电气强度为24.3 kV/mm,此时EP/GF复合材料综合性能最优。

In order to improve the cracking resistance of the encapsulating insulating material for dry-type air-core reactor,it is necessary to improve the toughness of the epoxy resin composite while ensuring the good electrical properties.In this paper,an epoxy glass fiber composite with good mechanical and electrical properties was obtained by adding different content of epoxy-terminated liquid nitrile butadiene rubber(ETBN),different content and partical size of Al_(2)O_(3) powders to the epoxy glass fiber(EP/GF)composite,and its structure and morphology,mechanical and electrical properties were tested.The results show that when the mass fraction of ETBN,5μm Al_(2)O_(3),and 100 nm Al_(2)O_(3) is 10%,30%,and 3%,respectively,the bending strength of the EP/GF composite reaches the highest of 291.0 MPa,which increases by 33.5%than that of the unmodified composite,and the electric strength is 24.3 kV/mm,the comprehensive properties are the best.