尾矿石英粉/PP复合材料制备与性能研究

Preparation and Performance Study of Tailing Quartz Powder/PP Composite Materials

为促进选矿钾长石尾矿石英粉的综合利用,分别用0.5%、1.0%、1.5%的硬脂酸对石英粉进行改性,并将改性后的粉体按10%、20%、25%、30%的添加量填充到PP复合材料中。利用红外光谱(FTIR)、接触角测量、扫描电子显微镜(SEM)及力学性能测试等方法对改性前后的粉体进行表征。结果表明:改性后粉体表面被有机化,接触角可达124°;硬脂酸改性可促进石英粉体在复合材料中分散,改善界面结合,增强复合材料的硬度和冲击强度。1%硬脂酸团聚现象少,改性效果最好,其含质量分数30%尾矿石英粉的复合材料可应用于车用一般零部件。

In order to promote the comprehensive utilization of quartz coming from feldspar tailings, stearic acid of different concentration （0.5%, 1.0%, 1.5%） was used as modiifer for surface modiifcation of quartz powders. And then the PP composites with 10%, 20%, 25%, 30% quartz powders were synthesized. The modiifed and unmodiifed quartz powder was characterized by Fourier Transform Infrared Spectroscopy （FTIR）, Contact Angle Meter, Scanning Electron Microscopy （SEM） and Mechanics Performance Test. Results indicated that the modiifed surface was successfully organized and its contact angle was closed to 124°. The surface modiifcation improved the dispersion of quartz particles in PP, as well as the interfacial bonding. Mechanics performance test revealed an enhancement of the impact strength and hardness compared with pure quartz powder. 1% stearic acid performed best with less agglomeration,and the composites containing 30% tailing quartz powders may be applied to automotive parts.