采用SRIM工艺制备了连续毡/聚氨酯(PU)复合材料,对SRIM工艺过程进行了理论模拟和实验研究。采用二级Arrhenius方程描述PU聚合时的动力学行为,通过绝热温升测量获得动力学参数,建立了PU聚合时的动力学模型。采用Brookfield流变仪研究并建立了PU聚合反应时的粘度模型。采用达西定律描述了充模过程中PU的流动行为。测量得到了充模过程中注射口处的压力上升曲线:当压力低于0.4 MPa时,压力上升的实验值与模型预测值吻合较好。

Research on SRIM Process of Continuous Strand Mat/Polyurethane CompositesTANG Hong-yan1,WANG Ji-hui1,ZHANG Lin-wen2,XU Peng-yao3 (1.School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;2.Beijing Fiber Reinforced Polymer Academy,Beijing 102101,China;3.China Unicom Dongguan,Dongguan 523000,China)SRIM was used to produce continuous glass strand mat reinforced polyurethane(PU) composites.The process of SRIM was researched through modeling and experimental aspects.A second order Arrhenius equation described PU polymerization kinetics.The kinetic model was established by using the kinetic data which were obtained from the adiabatic temperature rise measurement.The viscosity model of PU polymerization was developed by using Brookfield rheometer data.Darcy's law described PU flow behavior within the mold.The pressure rise profiles at the inlet were measured during filling,which coincided well with the simulation results when the pressure was less than 0.4 MPa.polyurethane;structural reaction injection molding(SRIM);continuous strand mat;permeability