?50mm改性聚氨酯/玄武岩纤维复合绝缘子芯棒的制备

PREPARATION OF ?50 MILIMETER BASALT FIBER(BF) REINFORCED MODIFIED POLYURETHANE COMPOSITES CORE ROD IN COMPOSITE INSULATOR

以改性聚氨酯(PUA)为基体,玄武岩纤维(BF)为增强材料,采用拉挤成型工艺制备了?50 mm的PUA/BF复合材料芯棒。重点研究了拉挤速率和纤维含量等对大直径PUA/BF复合芯棒力学性能、渗透性能和电气性能的影响。研究表明,当拉挤速度为300 mm/min,纤维含量为79.7%,偶联剂为KH570时,PUA/BF复合芯棒具有最佳的综合性能,其生产效率高、致密性好、品红测试合格,SEM测试显示树脂对纤维具有非常好的粘附性和浸润性,水扩散试验表明在水煮100 h后泄露电流仅为31μA,满足特高压线路复合绝缘子绝缘性能要求。

Basalt fiber（BF） reinforced modified polyurethane composites were prepared using basalt fiber as the reinforcing agent and polyurethane resin as the matrix through pultrusion process. The influences of the content of the fibre and the pulltursion speed on the electrical properties and permeation properties of the basalt fiber（BF）reinforced modified polyurethane composites were systematically studied. And their feasibility was investigated when being used as Ф50 milimeter tonnage composite insulator core in the super/ultra-high line. Under the condition of 300 mm/min of pultrusion speed,79. 7% of fiber content and KH570 as the coupling agent,the PUA/BF showed the most excellent comprehensive performances with good productivity and consistency,which all passed the magenta test. The SEM results show that the PUA had a good adhesion and wetting on the basalt fiber（BF）. The electrical property test indicated that the leakage current of composites after being boiled for 100 h were less than 30μA,which satisfied the insulation requirements of composite insulator core in the super/ultra-high line.