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采用固相剪切碾磨技术制备了高填充聚酰胺11(PA11)/钛酸钡(BT)压电复合材料,首次用微型注塑机Micropower5实现其微型注塑加工。研究了微型注塑加工中注射压力和模腔压力的变化及复合体系在微型模腔中的充填过程,以及注塑条件和填料含量的影响。研究结果表明:PA11/BaTiO3复合材料具有优良的微型注塑加工性能,充模极快,充填时间小于10-3s;提高加工温度和注射速率均有利于熔体完全充填,而提高注射速率更为有效;BT质量分数大于30%时,熔体流动性和充填性能下降;BT质量分数高达80%时,仍能在复合体系中均匀分散,可在注塑温度为270℃和注射速率为400 mm/s时,实现对微型模腔的完全充填。
High-filled polyamide 11 (PA11) / barium titanate (BT) piezoelectric composites were prepared by solid-state shear milling technology and the first micro-injection molding was performed using a micro-injection molding machine, Micropower5. The variation of injection pressure and cavity pressure in micro injection molding and the filling process of composite system in micro-cavity were studied. The effects of injection molding conditions and filler content were also studied. The results show that the PA11 / BaTiO3 composites have excellent micro-injection processing performance, filling speed is extremely fast and the filling time is less than 10-3s. Increasing the processing temperature and injection rate are all conducive to the complete filling of the melt, and it is more effective to increase the injection rate ; When the mass fraction of BT is more than 30%, the melt flowability and filling performance decrease; when the mass fraction of BT is as high as 80%, it can still be dispersed uniformly in the composite system at the injection temperature of 270 ℃ and the injection rate of 400 mm / s When the micro-cavity to achieve full filling.