长玻纤增强聚丙烯极薄注塑试样的结构与性能研究  

Structure and Properties of Thin-Wall Injection Molding Long Glass Fiber Reinforced Polypropylene

作　　者：葛亚宁 李修平 杜旭东 罗维[2] 邹华维[2] 梁梅[2] 

机构地区：[1]四川长虹模塑科技有限公司,四川绵阳621000 [2]高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065

出　　处：《塑料工业》2014年第1期77-82,共6页China Plastics Industry

基　　金：国家自然科学基金(51273118);四川省科技支撑计划项目(2010GZ0176;2013FZZ0006)

摘　　要：采用一套型腔尺寸为200 mm×50 mm×1.5 mm的薄壁样片注塑模对40%填充量的长纤维增强聚丙烯树脂(LGFPP)进行了充填试验。研究了在完全充填的条件下注塑成型制品不同位置的纤维含量、长度分布、取向情况以及对其力学性能的影响。结果表明,在成型压力和树脂所受到的剪切速率都要高于常规方法的薄壁注射成型过程中,纤维的长度损失很大;在整个试样中部稳定流动区域的纤维平均长度最长;纤维含量呈现浇口远端最高,浇口处最低的特点;纤维的取向呈现剪切层高,芯层较低的特点;纤维在基体中的含量及取向的综合效应对力学性能有显著影响。A cavity size of 200 mm× 50 mm × 1.5 mm sample injection mold was used to thin-wall injection molding （TWIM） filling test with 40 wt% long fiber-reinforced polypropylene （LGFPP） composite. The effect of fiber content, length distribution, orientation on mechanical properties was carried out under a completely filled condition. Experimental results showed that length loss of long glass fiber occurred in TWIM process was more than that in conventional injection molding because of its high molding pressure and shear rate. The average fiber length was longest in a steady-flow region in the middle of the sample. It appeared that the highest content of fiber was found near the end of flow, while the lowest near the gate relatively. A high degree of fiber orientation was showed in the shear-layer compared with the core area. The combined effect of fiber content and orientation in the matrix had a significant impact on the mechanical property of products.

关 键 词：薄壁注射 长玻纤增强 取向 分布 

分 类 号：TQ327.1[化学工程—合成树脂塑料工业]