中空玻璃微珠对超高分子量聚乙烯性能的影响

摘要

In order to improve the hardness and wear resistance of ultra high molecular weight polyethylene (PE-UHMW), molding temperature,hollow glass bead content and particle size on the hardness and wear resistance of PE-UHMW were studied. The PE-UHMW composites were prepared by molding process with the glass bead as filler. The research results show that when the molding temperature is 160℃ and molding pressure at 80 N,the pure PE-UHMW reach the highest Shore hardness(66.067). Added particle size of 180μm,content 5% hollow glass bead in PE-UHMW,the wear resistance is better,the friction coefficient is 0.234 and the wear rate is 0.079% with 15CrMoV steel,the Shore hardness is 70.44. The dispersion degree of hollow glass bead in PE-UHMW is the key factor to determine the friction and wear properties of the composites. Hollow glass beads in the matrix make heterogeneous nucleation effect,the node density and Shore hardness are increased and wear resistance is improved,but if the hollow bead size is too large or content is too high,it can be generate agglomeration phenomenon,resulting in decreasing the wear resistance of the composites.%为改善超高分子量聚乙烯(PE-UHMW)的硬度及耐磨性能，研究模压温度、中空玻璃微珠含量及粒径对PE-UHMW硬度和耐磨性能的影响。以中空玻璃微珠为填料，采用模压成型方法制备中空玻璃微珠改性PE-UHMW复合材料，通过邵氏硬度计和摩擦磨损试验机测试复合材料的硬度及摩擦磨损性能。结果表明，当模压压力为80 N、模压温度为160℃时，纯PE-UHMW的邵氏硬度最高(66.067)；当中空玻璃微珠粒径为180μm、质量分数为5%时，复合材料的耐磨性能较好，与15CrMoV钢的摩擦系数为0.234，磨损率为0.079%，邵氏硬度为70.44。复合材料的摩擦磨损性能主要取决于中空玻璃微珠在PE-UHMW基体中的分散程度。中空玻璃微珠在PE-UHMW基体中起到异相成核的作用，增大了PE-UHMW的节点密度，使其硬度增大，耐磨性能改善，但中空玻璃微珠粒径过大或含量过高时，会产生团聚现象，造成复合材料的耐磨性能下降。