聚氨酯反应注射成型充模流动研究

聚氨酯原料体系反应注射成型（ＲＩＭ）制品在汽车构件、商用机器外壳等制造方面得到越业越广泛的应用，同时ＲＩＭ制品也朝着体积大、注射速度快的方向发展。但目前在模具设计及工艺参数选择中仍采用经验或尝试的方法，耗费大量人力物力。为此，本文对长扁平板模聚氨酯反应注射成型（ＲＩＭ）充模流动过程进行了实验研究并建立了计算模型。得出的压力计算公式与实验结果进行了对比。结果表明在弃模时间ｔｆ远小于凝胶时间ｔｑｍ时充

Studies of Ployurethane RIM Mold Filling

Polyurethane RIM product has found more and more applications in making automobile exterior parts and commercial ma-chine frame. The present trend in RIM is toward larger, more complex part and faster reacting system. But until now. in mold designing and process parameter selecting, the trial and error approach are still employed. This paper deals with studies of RIM mold filling in a plaque mold. A model is developed for pressure rise, extent of reaction and temperature changes during filling. The prediction of the model are shown to be in good agreement with experimental result.