Wang Jian, Mao Qianchao, Jiang Nannan, Chen Jinnan
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Polymers (Basel). 2021 Dec 22;14(1):23. doi: 10.3390/polym14010023.
The reinforcement and matrix of a polymer material can be composited into a single polymer composite (SPC), which is light weight, high strength, and has easy recyclability. The insert injection molding process can be used to realize the multiple production of SPC products with a short cycle time and wide processing temperature window. However, injection molding is a very complicated process; the influence of several important parameters should be determined to help in the future tailoring of SPCs to specific applications. The effects of varying barrel temperature, injection pressure, injection speed, and holding time on the properties of the insert-injection molded polypropylene (PP) SPC parts were investigated. It was found that the sample weight and tensile properties of the PP SPCs varied in different rules with the variations of these four parameters. The barrel temperature has a significant effect, followed by the holding time and injection pressure. Suitable parameter values should be determined for enhanced mechanical properties. Based on the tensile strength, a barrel temperature of 260 °C, an injection pressure of 127.6 MPa, an injection speed of 0.18 m/s, and a holding time of 60 s were determined as the optimum processing conditions. The best tensile strength and peel strength were up to 120 MPa and 19.44 N/cm, respectively.
聚合物材料的增强体和基体可以复合成单一聚合物复合材料（SPC），该材料重量轻、强度高且具有易于回收利用的特性。嵌件注塑工艺可用于实现SPC产品的多件生产，且生产周期短、加工温度窗口宽。然而，注塑是一个非常复杂的过程；需要确定几个重要参数的影响，以便将来根据特定应用定制SPC。研究了不同料筒温度、注射压力、注射速度和保压时间对嵌件注塑聚丙烯（PP）SPC部件性能的影响。发现PP SPC的样品重量和拉伸性能随这四个参数的变化呈现不同规律。料筒温度影响显著，其次是保压时间和注射压力。应确定合适的参数值以提高机械性能。基于拉伸强度，确定料筒温度260℃、注射压力127.6MPa、注射速度0.18m/s和保压时间60s为最佳加工条件。最佳拉伸强度和剥离强度分别高达120MPa和19.44N/cm。
