以硅灰石为原料,以硫酸铝和水玻璃为包覆剂,采用化学沉淀法,制备了一种纳米硅酸铝-硅灰石复合粉体材料;用氨基硅烷对该材料进行表面改性后填充聚丙烯制备了聚丙烯复合材料.采用SEM、BET氮吸附比表面积仪、粒度仪、白度仪、XRD、EDX、FTIR等测试方法对复合及表面改性粉体材料进行了表征,并探讨了氨基硅烷改性复合粉体的机制.结果表明:硅灰石表面均匀地包覆了一层纳米硅酸铝,白度由90.5提高到92.5,比表面积由1.41 m2/g提高到4.78 m2/g,晶粒平均尺寸为54 nm;填充PP质量分数40%的改性复合粉体可以使纯PP的拉伸强度由17.81 MPa提高到21.97 MPa,弯曲强度由23.72 MPa提高到39.20 MPa,热变形温度由65.7℃提高到94.3℃.
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