粉煤灰细化与表面改性及其填充改性聚丙烯性能的研究

Study on Properties of Polypropylene Filled with Refined Modified Fly Ash

用燃煤电厂产生的废弃物粉煤灰作为填料,将粉煤灰进行物理球磨细化改性,再用硅烷偶联剂活化改性,然后与聚丙烯(PP)通过熔融共混制备成复合材料。结果表明,球磨后的粉煤灰制成的复合材料相比于纯PP弯曲强度提高了11.5%,而且这种复合材料的拉伸强度和冲击强度相比于填充未球磨粉煤灰的材料分别提高了10.7%和34.1%,并且其熔体流动速率和热稳定性都有较大提升;经过硅烷偶联剂活化后的粉煤灰制成的复合材料,其力学性能,热稳定性也都得到改善;实验证明粉煤灰的填充对PP有很好的增强增韧效果,并且当改性之后的粉煤灰填充量为20%(质量分数,下同)时,综合性能最佳。

The waste fly ash obtained from coal-fired power plants was refined by physical ball milling, activated with a silane coupling agent, and then used as a filler to prepare polypropylene (PP) matrix composites by melt blending. The results indicated that, compared to pure PP, the composites exhibited an increase in bending strength by 11.5 %, in tensile strength by 10.7 %, and in impact strength by 34.1 % when using the fly ash only treated by ball milling. Moreover, there was an improvement in the melt flow index and thermal stability of the composites. When the fly ash was treated with a silane coupling agent and then used for PP, the resulting composites showed a further improvement in mechanical properties and thermal stability. Based on our experimental results, there was a good toughening effect on PP when 20 wt% of surface-modified fly ash was incorporated, thus leading to optimal comprehensive performance for PP composites.