模内混合注塑成型聚丙烯与预制件间界面黏结强度研究

Interfacial bonding strength between polypropylene and perform on in-mold hybrid injection molding technology

通过Moldflow软件仿真和成型实验,研究模内混合成型中连续纤维热塑性复合材料(CFRT)热压成型预制件与注塑成型聚丙烯间界面黏结强度。仿真研究预制件温度、熔体温度及保压压力对黏结界面温度场及压力场的影响规律,分析模内混合注塑成型界面黏结过程,指出CFRT预制件表面快速加热对界面黏结影响的重要性。研究结果表明:当预制件没有加热时,界面黏结强度随着熔体温度和保压压力的增加而显著提高,预制件达到熔点温度后,由于界面温度显著升高且足以满足界面分子扩散运动的能量需求,故熔体温度和保压压力的进一步提升对于界面黏结强度影响不大。

Based on the simulation of Moldflow software and experiment,the interfacial bonding strength between the preform of continuous fiber reinforced thermoplastic(CFRT)composites and the plastic injection molding of polypropylene(PP)was studied during in-mold hybrid molding.The effect of preformed temperature,melt temperature and holding pressure on the temperature field and pressure field of bonding interface was researched by simulation,the interfacial bonding process of in-mold hybrid injection molding was analyzed,and the importance of rapid heating of CFRT surface for interfacial bonding was pointed out.The results show that without heating perform,the interfacial bonding strength is improved greatly with the increase of melt temperature and pressure.Due to the energy needs,the diffusion motion of interface molecules is satisfied by the significant increase of interface temperature after perform reaches the melting point,and the further improvement of melt temperature and holding pressure have little effect on the interfacial bonding strength.