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采用硅烷偶联剂KH560和钛酸酯偶联剂NDZ201对硬石膏粉进行表面改性,将其与聚酰胺6(PA6)共混,利用双螺杆挤出机制备出相应的PA6/硬石膏粉复合材料,研究了不同偶联剂对复合材料力学性能、熔融与结晶行为及热稳定性的影响。结果表明:KH560和NDZ201均以化学键的形式接枝到硬石膏粉的表面;与未改性硬石膏粉相比,改性后的硬石膏粉能更好地提高复合材料的力学性能,其中KH560对硬石膏粉的表面改性效果优于NDZ201;改性前后硬石膏粉的加入,不仅提高了PA6的结晶温度和结晶度,使PA6从α晶型向γ晶型转变,还有利于提高PA6的热稳定性。
The surface of the anhydrite powder was modified by the silane coupling agent KH560 and the titanate coupling agent NDZ201, then blended with polyamide 6 (PA6) to prepare the corresponding PA6 / anhydrite powder The effects of different coupling agents on the mechanical properties, melting and crystallization behavior and thermal stability of the composites were studied. The results showed that both KH560 and NDZ201 were chemically grafted onto the surface of the anhydrite powder. Compared with the unmodified anhydrite powder, the modified anhydrite powder could improve the mechanical properties of the composites better. KH560 The effect of surface modification on anhydrite powder is better than that of NDZ201. Before and after the modification, the addition of anhydrite powder not only increases the crystallization temperature and crystallinity of PA6, but also changes PA6 from α crystal to γ crystal. Thermal stability.