以聚氨酯(PU)增韧环氧树脂(EP)为基体，连续玄武岩纤维布(BF)为增强体，制备了BF/EP-PU复合材料，采用扫描电子显微镜对材料的断裂微观形貌进行表征，系统研究玄武岩纤维的表面处理、PU的添加量对BF/EP-PU复合材料力学性能和电性能的影响。结果表明：玄武岩纤维经KH550处理后，BF/EP-PU复合材料的弯曲强度明显提高，适量聚氨酯的加入可以改善复合材料的冲击性能，低频时(0~100 Hz)复合材料的介质损耗因数和相对电容率随频率的增加而降低，当频率升高到100 Hz以上时介质损耗因数和相对电容率逐渐趋于稳定。
We prepared a BF/EP-PU composite using epoxy resin (EP) toughened by polyurethane (PU) as matrix and basalt fiber (BF) as reinforcement, and its micro fracture morphology was characterized by scanning electron microscope (SEM). The effect of surface treatment of basalt fiber and different mass ratio between PU and EP on the mechanical properties and electrical properties of the BF/EP-PU compos-ites were studied systematically. The results show that the bending strength of the BF/EP-PU composites increases obviously after the basalt fiber is treated by KH550. The addition of suitable amount of polyure-thane could improve the impact strength of the composites. The dielectric dissipation factor and relative permittivity of the composites decrease with the increase of frequency at low frequency, and the both tend to be stable when the frequency is higher than 100 Hz.
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