研究通过KH550改性玻璃纤维（GF）制备改性玻璃纤维（mGF），旨在增强PA66复合材料的力学及绝缘性能，探究mGF掺量对PA66复合材料力学性能及绝缘性能的影响。结果表明：随着mGF掺量的增加，复合材料的密度呈现先上升后降低的趋势；拉伸强度、弹性模量及缺口冲击强度均呈现先上升后下降的趋势。当mGF掺量为20%时，PA66复合材料的各项力学性能的增强效果最好，分别较纯PA66复合材料的拉伸强度、弹性模量及缺口冲击强度增加了13.38%、19.23%和19.59%。PA66复合材料在直流和交流下的电场击穿强度均呈现先上升后下降的趋势，同时PA66复合材料的介电常数呈现先降低后升高的趋势，且在掺量为30%时达到最低；PA66复合材料的体积电阻率呈现先上升后下降的趋势，且在掺量为20%时达到最高，为3.34×10¹³ Ω·m。添加20% KH550改性的GF能够增强PA66复合材料的力学及绝缘性能。该材料可用作电气断路器材料。

The study aims to prepare modified glass fiber (mGF) through KH550 modified glass fiber (GF), aiming to enhance the mechanical and insulation properties of PA66 composites, and explore the effects of mGF content on the mechanical and insulation properties of PA66 composites. The results show that as the mGF content increases, the density of the composites shows a trend of first increasing and then decreasing. The tensile strength, elastic modulus, and notch impact strength all show a trend of first increasing and then decreasing. When the mGF content is 20%, the enhancement effect of various mechanical properties of PA66 composites is the strongest, with an increase of 13.38%, 19.23%, and 19.59% compared to the tensile strength, elastic modulus, and notch impact strength of pure PA66 composites, respectively. The electric field breakdown strength of PA66 composites shows a trend of first increasing and then decreasing under both DC and AC conditions. At the same time, the dielectric constant of PA66 composites shows a trend of first decreasing and then increasing, and reaches its lowest point at a dosage of 30%. The volume resistivity of PA66 composites shows a trend of first increasing and then decreasing, and reaches its highest value at a dosage of 20%, which is 3.34×10¹³ Ω·m. The mechanical and insulation properties of PA66 composites can be enhanced by adding 20% KH550 modified GF, which can be applied in the preparation of electrical circuit breaker materials. This material can be used as an electrical circuit breaker material.