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中文字数:6280,中文页数:15 英文字数:4229页数:19
摘要：本报告的目的是通过实验研究聚碳酸酯复合材料水辅注塑的成型工艺。实验在一个配备了水辅注塑系统的80吨注塑机上进行，此系统包括一个水泵，一个压力检测器，一个注水栓、配有一个温度调节器的水箱和一个控制电路。实验材料包括原始的聚碳酸酯和15%玻璃纤维填充聚碳酸酯的复合物以及一个中间有一个肋板的空心盘。实验根据水注入注塑件的长度的影响测得了各种工艺参数以及这些部分的的机械性能。X射线衍射也被用来识别资料及结构参数。最后,作了水辅助和气体辅助注塑件的比较。实验发现充模压力、熔体压力,熔融温度，及短射类型是影响水注塑行为的主要参数。材料在模具一边比在水一边展示了较高的结晶度。气辅成型注塑件也要比水辅成型注塑件结晶度高。另外，注塑件表面的玻璃纤维大部分取向与流动方向一致，而随着离注塑件表面距离的增加，越来越多的垂直于流动方向。
关键词：水辅注塑成型，玻璃纤维增的强聚碳酸酯复合物，工艺参数，机械性能，结晶，树脂基复合材料、加工
Abstract
The purpose of this report was to experimentally study the water-assisted injection molding process of poly-butylene-terephthalate(PBT) composites. Experiments were carried out on an 80-ton injection-molding machine equipped with a lab scale water injection system, which included a water pump, a pressure accumulator, a water injection pin, a water tank equipped with a temperature regulator, and a control circuit. The materials included virgin PBT and a 15% glass fiber filled PBT composite, and a plate cavity with a rib across center was used. Various processing variables were examined in terms of their influence on the length of water penetration in molded parts, and mechanical property tests were performed on these parts. X-ray diffraction (XRD) was also used to identify the material and structural parameters. Finally, a comparison was made between water-assisted and gas-assisted injection molded parts. It was found that the melt fill pressure, melt temperature, and short shot size were the dominant parameters affecting water penetration behavior.Material at the mold-side exhibited a higher degree of crystallinity than that at the water-side. Parts molded by gas also showed a higherdegree of crystallinity than those molded by water. Furthermore, the glass fibers near the surface of molded parts were found to be oriented mostly in the flow direction, but oriented substantially more perpendicular to the flow direction with increasing distance from the skin surface.
Keywords: Water assisted injection molding; Glass fiber reinforced poly-butylene-terephthalate (PBT) composites; Processing parameters; Mechanical properties; Crystallinity; Polymer matrix composites; Processing.
