改性椰壳纤维填充聚甲醛复合材料的摩擦磨损性能研究

Study on Friction and Wear Properties of Polyoxymethylene Composites Filled with Modified Coir Fibers

采用未改性及经过氢氧化钠(NaOH)和3-氨基丙基三乙氧基硅烷(KH550)协同改性的椰壳纤维填充聚甲醛(POM),通过注塑成型工艺制备椰壳纤维/POM复合材料。借助傅里叶变换红外光谱(FTIR)和热重分析(TG)对比测试改性前后椰壳纤维的化学结构和热稳定性,使用摩擦磨损试验机测试纯POM及改性前后椰壳纤维/POM复合材料的摩擦磨损性能,并通过扫描电镜(SEM)观察磨损表面形貌并分析磨损机理。结果表明,NaOH和KH550协同改性能有效改善椰壳纤维与POM的界面相容性,其中填充量为5%的改性椰壳纤维/POM复合材料的干滑动摩擦因数为0.15,磨损率较纯POM下降了70%,耐磨性显著提高,磨损机理主要为疲劳磨损。

Coir fiber/polyoxymethylene(POM)composites were prepared by injection molding using POM filled with unmodified coir fiber and the coir fiber co-modified with NaOH and 3-aminopropyltriethoxysilane(KH550).The chemical structure and thermal stability of coir fiber before and after modification were compared by fourier transform infrared spectroscopy(FTIR)and thermogravimetric analysis(TG).The friction and wear properties of pure POM and coir fiber/POM composite materials before and after modification were tested by friction and wear testing machine.The surface morphology of the friction surface was observed by scanning electron microscopy(SEM)and the wear mechanism was analyzed.The results show that NaOH and KH550 could effectively improve the interfacial compatibility between coir fiber and POM.The dry sliding friction coefficient of the modified coir fiber/POM composite with a filling amount of 5%is 0.15,and the wear rate is 70%lower than that of the pure POM.The wear resistance is significantly improved,and the main wear mechanism is fatigue wear.