Liu Hechen, Wei Liwei, Gao Fengsheng, Tang Li, Li Le, Sun Zhanglin, Liu Yunpeng, Dong Peng
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.
Electric Power Research Institute of China Southern Power Grid, Kexiang Road No.11, Guangzhou 510000, China.
Nanomaterials (Basel). 2022 Sep 25;12(19):3344. doi: 10.3390/nano12193344.
Bird pest control has become a major task for the operation and maintenance of distribution network lines. Epoxy resin that cures quickly at room temperature can be used to coat locations where birds frequently build their nests. However, epoxy resin has enormous internal stress and is brittle, so it is essential to toughen it. In this paper, for a room temperature curing system composed of polyurethane-modified epoxy resin and a polythiol curing agent, three kinds of particles, i.e., AlO, SiO, and Mg(OH), were used to modify a polyurethane modified epoxy resin. Orthogonal experiments were designed to study the effects of different fillers on the comprehensive properties of polyurethane-modified epoxy resins. The experimental results showed that there were not only independent effects of different kinds if particles on the resin, but also synergistic effects of multiple particles. Nanoparticles can reduce the defects introduced by microparticles to a certain extent and improve the mechanical and electrical properties of the resin. The overall performance of the resin was optimized when the amounts of SiO, AlO, and Mg(OH) were 1.7%, 2.5%, and 7%, respectively. The tensile strength of the resin was increased by 70%, the elongation at a break by 67.53%, and the breakdown strength by 20.31% compared with before the addition of filler. The microscopic morphology and thermal properties of the resin before and after the addition of filler were also studied. Adding fillers caused more cracks to absorb part of the energy when the resin matrix was stressed and increased the rigidity of the resin matrix and the resin's glass transition temperature (T) by 13.48 °C. Still, the temperature corresponding to the maximum rate of weight loss (T) remained unchanged.
鸟类防治已成为配电网线路运行维护的一项重要任务。室温下快速固化的环氧树脂可用于涂覆鸟类频繁筑巢的位置。然而，环氧树脂存在巨大的内应力且脆性大，因此对其进行增韧至关重要。本文针对由聚氨酯改性环氧树脂和多硫醇固化剂组成的室温固化体系，采用AlO、SiO和Mg(OH)三种颗粒对聚氨酯改性环氧树脂进行改性。设计正交试验研究不同填料对聚氨酯改性环氧树脂综合性能的影响。实验结果表明，不同种类的颗粒对树脂不仅有独立作用，而且多种颗粒存在协同作用。纳米颗粒能在一定程度上减少微米颗粒引入的缺陷，提高树脂的力学性能和电学性能。当SiO、AlO和Mg(OH)的用量分别为1.7%、2.5%和7%时，树脂的综合性能最佳。与添加填料前相比，树脂的拉伸强度提高了70%，断裂伸长率提高了67.53%，击穿强度提高了20.31%。还研究了添加填料前后树脂的微观形态和热性能。添加填料使树脂基体受力时产生更多裂纹以吸收部分能量，提高了树脂基体的刚性以及树脂的玻璃化转变温度（T）13.48℃，但失重最大速率对应的温度（T）保持不变。
