玻纤质量分数对短玻纤增强聚丙烯水辅助共注塑管件的影响  

Effect of glass fiber mass fraction on the water assisted co-injection molding pipes of short glass fiber reinforced polypropylene

作　　者：匡唐清 朱瑶瑶 柳和生 赖家美[2] 钟罗浩 KUANG Tangqing;ZHU Yaoyao;LIUHesheng;LAI Jiamei;ZHONG Luohao(School of Mechanical&Vehicle Engineering,East China Jiaotong University,Nanchang 330013,China;School of Mechatronics Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]华东交通大学机电与车辆工程学院,南昌330013 [2]南昌大学机电工程学院,南昌330031

出　　处：《复合材料学报》2022年第10期4551-4560,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51763016);江西省科技厅重点研发计划项目(20203BBE53065);江西省自然科学基金(20181BAB206014)。

摘　　要：水辅助共注塑成型技术(Water-assisted co-injection molding,WACIM)是一种结合共注塑技术和水辅助注塑技术的新型注塑工艺。特定的工艺过程使得玻纤增强复合材料应用于WACIM工艺时具有特定的玻纤取向规律和增强特点。以纯聚丙烯(PP)为内层材料、不同质量分数的短玻纤增强聚丙烯(GF/PP)为外层材料制备系列WACIM管件,比较分析了实验条件下玻纤质量分数对管件壁厚、玻纤取向分布及拉伸强度的影响规律与机制。研究发现在玻纤质量分数不超过30wt%时,管件壁厚差异不明显,当玻纤质量增加到40wt%时,管件内外壁厚均增大;WACIM管件外层按玻纤取向的分布特点均可分为近界面层、中间层和近模壁层,玻纤沿流动方向的取向程度由内向外依次降低;管件的拉伸性能随着玻纤质量分数的增加呈先增后减的趋势,玻纤质量分数为30wt%时管件拉伸强度最好。与玻纤增强聚丙烯的水辅助注塑成型(WAIM)管件比较,发现两种工艺中玻纤质量分数对壁厚、玻纤取向分布和拉伸强度的影响有差异,影响机制有所区别。Water-assisted co-injection molding(WACIM) technology is an novel injection molding process that combines co-injection molding technology and water-assisted injection molding technology. Its special process makes the glass fiber reinforced composite used in the process have special characteristics of fiber orientation and enhancement. WACIM pipes with polypropylene(PP) as inner material and short glass fiber reinforced polypropylene(GF/PP) as outer material were prepared to investigate the effects of glass fiber mass fraction on the thicknesses of pipe inner and outer layers, glass fiber orientation and tensile strength. It is found that when the mass fraction of glass fiber is less than 30wt%, the variations of pipe inner and outer layer thicknesses are not obvious. When the mass fraction of glass fiber increases to 40wt%, both the inner and outer layer thicknesses of pipe increase.According to the distribution characteristics of glass fiber orientation, the outer layer of WACIM pipes can be divided into three layers: Near interface layer, intermediate layer and near mold wall layer. The orientation degree of glass fiber along the flow direction decreases from inside to outside. The tensile properties of pipes increased first and then decreased with the increase of glass fiber mass fraction. The highest tensile strength of pipes can be obtained when the glass fiber mass fraction is 30wt%. It is found by comparison that the influences of glass fiber mass fraction on thickness, glass fiber orientation and tensile strength of WACIM and water-assisted injection molding(WAIM) pipes are different, and the influence mechanism are different.

关 键 词：短玻纤增强聚丙烯 水辅共注 玻纤质量分数 取向 拉伸强度 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]