镀银玻璃纤维的制备及其在环氧树脂中的应用

Preparation of silver-coated glass fiber and its application in epoxy resin

对玻璃纤维进行除油和粗化后,用硅烷偶联剂KH550进行改性,然后用葡萄糖-银氨溶液实施化学镀银,制得镀银玻璃纤维。研究了改性时间、还原剂葡萄糖质量浓度和主盐硝酸银质量浓度对镀银玻璃纤维体积电阻率的影响,得到最好的工艺条件为:改性时间100 min、葡萄糖35 g/L、硝酸银20 g/L。借助扫描电镜和能谱仪表征了所得镀银玻璃纤维的表面形貌和成分,发现银镀层均匀致密。将该镀银玻璃纤维作为导电填料添加到环氧树脂中,所得复合材料的体积电阻率较纯环氧树脂大幅降低。当m(镀银玻璃纤维)∶m(环氧树脂)=2.2∶1.0时,体积电阻率最低,达0.033?·cm,导电效果最好。

Glass fiber was modified by silane coupling agent KH550 after degreasing and roughening, and then electrolessly plated with silver using a glucose-silver ammonia solution, thereby obtaining a silver-coated glass fiber. The effects of modification time as well as mass concentrations of glucose （as reducing agent） and silver nitrate （as main salt） on the volume resistivity of silver-coated glass fiber were studied and the optimal plating conditions were determined as follows： glucose 35 g/L, silver nitrate 20 g/L and modification time 100 min. The surface morphology and composition of the silver-coated glass fiber obtained therefrom were characterized by scanning electron microscopy and energy-dispersive spectroscopy, finding that silver coating is uniform and compact. The silver-coated glass fiber was used as conductive filler and added to epoxy resin, obtaining a composite material, whose volume resistivity is greatly decreased as compared with the pure epoxy resin. The volume resistivity is decreased to 0.033 F2.cm when the mass ratio of silver-coated glass fiber to epoxy resin is 2.2：1.0, showing the best conductivity.