加工参数及配方对PP/LLDPE共混物泡孔形态的影响  

Effects of Processing Parameters and Formulations on Cell Morphology of PP/LLDPE Blends

作　　者：曹贤武 伍巍 张轶钧 何丁 黄益威 

机构地区：[1]华南理工大学聚合物新型成型装备国家工程研究中心聚合物成型加工工程教育部重点实验室,广东广州510640

出　　处：《塑料科技》2011年第10期65-68,共4页Plastics Science and Technology

基　　金：国家自然科学基金项目(51073061)

摘　　要：采用高压毛细管流变仪对不同含量碳酸钙(CaCO3)的聚丙烯/线型低密度聚乙烯(PP/LLDPE)共混物的流变性能进行了表征;并利用自制的实验装置,在不同发泡温度和饱和压力下,对共混物进行了超临界CO2模拟挤出发泡实验研究。结果表明:使用高熔体强度聚丙(烯HMSPP)发泡可以获得较好的泡孔形态;添加成核剂CaCO3可以使发泡试样的泡孔结构更加规则,泡孔分布更加均匀;随着CaCO3含量的增加,共混物的稠度上升,非牛顿指数降低,当CaCO3含量为3%时,共混物的发泡效果较好;130℃为最佳发泡温度,此时发泡试样的结构完整尺,寸均匀;随着饱和压力的增加发,泡试样的泡孔密度也有所提高。A high pressure capillary rheometer was used to characterize the rheological properties of PP/ LLDPE blends with different content of CaCO3.The extrusion foam experiments were carried out by using a self-designed supercritical CO2 dynamic simulation foaming device.Different proportions of PP/ LLDPE foams were prepared under various foaming temperature and saturation pressure.The results show that it could get better cell morphology by using high melt strength polypropylene（HMSPP） compared with ordinary PP;the additon of necleating agent CaCO3 makes the cell structure of the foamed samples more regular,and the cell distribution more uniform;with the increase of CaCO3 content,the consistency of the blends increases, while the non-Newtonian index decreases;when CaCO3 content is 3%,the microstructure of the foaming blend is improved remarkably;the optimum foaming temperature is 130 ℃;the cell density increases with the increase of saturation pressure.

关 键 词：聚丙烯 线型低密度聚乙烯 碳酸钙 发泡 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TQ325.14