溢流槽对微注塑成型iPP制品的增强作用  

Enhancement Effect of Overflow Slot on Micro Injection Molding iPP Products

作　　者：刘忠柱 李乐乐[2] 郑国强[2] 秦琦[1] 米立伟[1] 

机构地区：[1]中原工学院材料与化工学院,河南郑州450007 [2]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《塑料科技》2018年第3期46-50,共5页Plastics Science and Technology

基　　金：国家自然科学基金(51173171)

摘　　要：采用微注塑成型技术制备了等规聚丙烯（i PP）制品,并在注射型腔末端增设了溢流槽。通过拉伸测试、二维广角X射线衍射法（2D-WAXD）、偏光显微镜观察（POM）和差示扫描量热法（DSC）考察了溢流槽的引入对i PP制品微观结构和力学性能的影响。拉伸测试结果表明：溢流槽的引入使得i PP制品的拉伸强度和弹性模量显著提高,分别提高了27.9%和43.7%。微观结构分析结果表明：与常规微注塑i PP制品相比,溢流槽的引入使得i PP制品的剪切层厚度、结晶度、串晶数量均增大。通过分析微观结构的变化,阐明了溢流槽对微注塑成型i PP制品的增强机理。The isotactic polypropylene（i PP） parts were prepared by microinjection molding, and an overflow cavity was introduced in the end of the microinjection mold. The effect of overflow cavity on the tensile properties and microstructures of microinjection molded i PP parts was investigated through the tensile test, two-dimensional wide-angle X-ray diffraction（2 D-WAXD）, polarizing optical microscope（POM） and differential scanning calorimetry（DSC）. Tensile test results reveale that： the tensile strength and tensile modulus of i PP parts increase by 27.9% and 43.7% respectively, by introducing overflow cavity. The microstructure analysis shows that： compared with the normal microinjection molded i PP parts, the thickness of shear layer, crystallinity and shish-kebab number of microinjection molded i PP parts increase obviously with the introduction of overflow slot. Through the analysis of the microstructure changes, the enhancement mechanism of the overflow groove on the micro injection molding i PP products is clarified.

关 键 词：微注塑成型 等规聚丙烯 溢流槽 增强 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]