Kim Young Shin, Kim Jae Kyung, Jeon Euy Sik
Industrial Technology Research Institute, Kongju National University, Cheonan-daero, Seobuk-gu, Cheonan-si 31080, Chungcheongnam-do, Korea.
Department of Mechanical Engineering, Graduate School, Kongju National University, Cheonan-daero, Seobuk-gu, Cheonan-si 31080, Chungcheongnam-do, Korea.
Materials (Basel). 2019 Sep 19;12(18):3047. doi: 10.3390/ma12183047.
Among the composite manufacturing methods, injection molding has higher time efficiency and improved processability. The production of composites via injection molding requires a pre-process to mix and pelletize the matrix polymer and reinforcement material. Herein, we studied the effect of extrusion process conditions for making pellets on the mechanical and thermal properties provided by injection molding. Polyamide 6 (PA6) was used as the base, and composites were produced by blending carbon fibers and AlO as the filler. To determine the optimum blending ratio, the mechanical properties, thermal conductivity, and melt flow index (MI) were measured at various blending ratios. With this optimum blending ratio, pellets were produced by changing the temperature and RPM conditions, which are major process variables during compounding. Samples were fabricated by applying the same injection conditions, and the mechanical strength, MI values, and thermal properties were measured. The mechanical strength increased slightly as the temperature and RPM increased, and the MI and thermal conductivity also increased. The results of this study can be used as a basis for specifying the conditions of the mixing and compounding process such that the desired mechanical and thermal properties are obtained.
在复合材料制造方法中，注塑成型具有更高的时间效率和更好的加工性能。通过注塑成型生产复合材料需要一个预处理过程，将基体聚合物和增强材料进行混合并造粒。在此，我们研究了造粒挤出工艺条件对注塑成型提供的机械性能和热性能的影响。以聚酰胺6（PA6）为基体，通过将碳纤维和AlO作为填料进行共混来制备复合材料。为了确定最佳共混比，在不同共混比下测量了机械性能、热导率和熔体流动指数（MI）。采用这个最佳共混比，通过改变温度和转速条件（这是复合过程中的主要工艺变量）来生产颗粒。通过应用相同的注塑条件制备样品，并测量其机械强度、MI值和热性能。随着温度和转速的升高，机械强度略有增加，MI和热导率也增加。本研究结果可作为确定混合和复合工艺条件的依据，从而获得所需的机械性能和热性能。
