摘要：采用不同的改性剂对煤矸石电厂灰渣进行表面改性, 将改性后灰渣与聚丙烯 (PP) 混合均匀, 通过挤出注塑得到灰渣-聚丙烯复合材料, 并测试其力学性能;利用SEM、FT-IR、DSC等分析方法, 研究改性灰渣对复合材料力学性能与结晶行为的影响规律。结果表明, 采用硅烷偶联剂SCA1113和SCA503组成的复合偶联剂体系对灰渣改性效果最好, 改性后灰渣-PP复合材料较改性前的拉伸强度由25.70 MPa增加至29.58 MPa, 弯曲强度由33.60 MPa增加至35.99 MPa, 冲击强度由3.04 kJ·m^-2增加至3.85 kJ·m^-2;改性后的灰渣在聚丙烯中起到异相成核的作用, 使聚丙烯的结晶温度提高, 结晶速率增大, 微晶尺寸分布变窄。

关键词：煤矸石电厂；灰渣；聚丙烯；硅烷偶联剂；力学性能

Abstract：Ultra-fine coal gangue power plant ash was modified with different surface modification agent, and blended with polypropylene (PP) . Ash-PP composite material was obtained by extrusion and injection molding, and its mechanical properties were also measured. The effects of modified ash on the mechanical properties and crystallization behavior of composite materials were studied by the SEM, FT-IR and DSC. The results show that the modification effect of silane coupling agent SCA1113 and SCA 503 are optimal. The tensile strength, the bending strength, and the impact strength increase from 25.70 to 29.58 MPa, 33.60 to 35.99 MPa, and 3.04 to 3.85 k J·m^-2 respectively. The modified ash in the composite plays an important role in the polypropylene because of heterogeneous nucleation effect, to increase the crystallization temperature of polypropylene and the crystallization rate, and decrease the crystallite size distribution.

Keywords：gangue power plant；ash；polypropylene；silane coupling agent；mechanical property