聚磷酸铵粉体改性及对聚丙烯力学性能的影响

采用氯化铝和氨水溶液为原料,在液相体系中生成氢氧化铝,使其包覆在阻燃剂聚磷酸铵(APP)颗粒的表面,制备了表面包覆氢氧化铝的聚磷酸铵复合颗粒(N-APP)。通过调整合适的反应参数对工艺条件进行优化设计,确定了最佳反应条件。同时对最终产品的表面形貌、抗水性以及热稳定性等进行了表征,扫描电镜(SEM)结果表明,经包覆改性后,粉体的表面粗糙度明显增加,并且,改性后产品N-APP(6#)的接触角由未改性时的8.9°提高到118.9°,具有较好的疏水性能;热失重分析结果表明,包覆改性在一定程度上提高了产品的热稳定性。将经包覆改性后的产品在聚丙烯(PP)填充应用,与添加未改性APP的PP复合材料相比,添加包覆改性产品的PP复合材料的力学性能明显提升。

The Surface Modification and Characterization of Ammonium Polyphosphate in Small Scale and Mechanical Influence on Polypropylene

The composite particle( N-APP) was prepared by the chemical reaction between aluminium chloride and ammonia on the surface of ammonium polyphosphate( APP). The optimum reaction condition was obtained by adjusting the the experimental parameters test installation. The modified product was characterized by surface microstructure,water resistance and thermal stability. Result of scanning electron microscope( SEM) indicated that the surface roughness of N-APP was increased after modification;The water contact angle( WCA) of the N-APP was 118. 9°which was much higher than that of APP( 8. 9°),It was suggested that the surface properties of N-APP changed from hydrophilicity to hydrophobicity. Thermogravimetric analysis( TGA) demonstrated that the thermal stability of N-APP was improved. Finally,APP and N-APP were incorporated in polypropylene( PP). Results demonstrated that PP/N-APP composite showed better mechanical properties with that of PP/APP composite.