Abstract:

Nano-SiO₂ modified with KH550 can be dispersed in sizing, with low effect on the size and surface tension of sizing. The surface roughness of basalt fiber(BF) increases obviously after coating with sizing modified with nano-SiO₂, as  well the increases of breaking strength by 18. 75% and interlaminar shear strength by 18. 76%. It was confirmed by the oservation of dynamic contact angle meter(DCAM) and scanning electronic microscopy( SEM) that the interface compatibility between fibers and matrix resin was improved. The nano-SiO₂ functions as bridge between fibers and epoxy resin.

Key words: modified nano-SiO₂, sizing, basalt fiber, mechanical property, composite

摘要： 经 KS550改性的纳米 SiO₂粒子（150nm），能够稳定分散在玄武岩纤维涂层浆料中，对浆料的粒径及表面张力影响不大。玄武岩纤维表面经改性纳米 SiO₂改性后，有效地改善了纤维表面粗糙度，使断裂强力提高 18.75%，层间剪切强度提高 18.76%。纳米 SiO₂改性的玄武岩连续纤维及其复合材料断面 SEM分析表明，玄武岩连续纤维表面均匀涂覆一层纳米 SiO₂颗粒，使玄武岩连续纤维与环氧树脂的界面相容性大大提高，复合材料断面非常整齐。改性纳米 SiO₂在玄武岩纤维及环氧树脂之间起桥梁作用。

关键词: 改性纳米SiO₂, 涂层浆料, 玄武岩纤维, 力学性能, 复合材料