玻璃纤维增强聚丙烯微孔注塑发泡成型

对不同填充形式下的3种聚丙烯(PP)进行Mucell微孔注射成型试验。根据扫描电镜(SEM)结果得出:3种PP发泡差别较大且出现了明显的分层现象。通过单因素四水平试验法,考察了在微孔注射成型过程中3种PP的熔体温度和注射速度对制品拉伸强度的影响。结果表明:随着熔体温度的增加,发泡材料的拉伸强度基本呈现上升趋势;较低的注射速度得到的样条残余玻纤长度较长,材料力学性能较好;进而得到了发泡样条的宏观力学性能与残余玻纤长度之间的关系。

Microcellular Injection Molding of Glass Fiber Reinforced Polypropylene

Mucell microporous injection molding of three kinds of polypropylene(PP) with different filling forms were studied. According to the analysis of SEM results, three kinds of PP had significant difference in foaming results and obvious stratification phenomenon. The effects of PP melt temperature and injection speed on the tensile strength of the product were investigated by single factor experiment at four levels. The results show that with the increase of melt temperature, the tensile strength of the foamed material increase. Lower injection speed results in longer length of spline residual glass fiber and the better mechanical properties of the material. The relationship between the macroscopic mechanical properties of the foamed spline and the length of the remaining glass fiber is obtained.