不同高密度聚乙烯发泡体系的挤出发泡行为研究  

Extrusion Foaming Behavior of Different High Density Polyethylene Foaming Systems

作　　者：刘本刚[1,2] 赵哲晗[1] 何路东[1] 薛云龙[1] 王向东[1] 杜中杰[2] 张玉霞[1] 

机构地区：[1]北京工商大学材料与机械工程学院,北京100048 [2]北京化工大学材料科学与工程学院,北京100029

出　　处：《中国塑料》2011年第3期70-74,共5页China Plastics

基　　金：北京市教育委员会科技发展计划面上项目资助(KM200910011006)

摘　　要：通过挤出成型的方法制备了7600M、5000S和5200B 3个牌号高密度聚乙烯(PE-HD)及其纳米蒙脱土(nano-OMMT)复合材料的发泡样品,采用差示扫描量热仪(DSC)研究了7600M、5000S和5200B的结晶行为,使用真密度计和扫描电子显微镜(SEM)测试了3个牌号PE-HD及其nano-OMMT复合材料发泡样品的密度和电镜照片。结果表明,熔体流动速率对于发泡过程有很大影响,3种PE-HD中,熔体流动速率居中的5200B发泡效果最好,发泡剂用量为2份时,发泡样品的密度达到0.59 g/cm3;加入nano-OMMT可以改善熔体流动速率较高的树脂的发泡效果。Foamed samples of three kinds of PE-HD , including PE-HD 7600M, PE-HD 5000S, and PE-HD 5200, and PE-HD/nano-montmorillonite composites were prepared via extrusion foaming. Crystallization behavior of 7600M, 5000S, and 5200B was studied by differential scanning calorimetry （DSC）. Density and electron micrographs of the three grades of PE-HD and their nano- OMMT composite foam samples were tested via true density meter and scanning electron microscopy （SEM）. The result showed that melt flow rate had effect on the extrusion foaming. The lowest density of the foamed samples was 0. 59 g/cma when the resin was 5200B and the content of foaming agent was 2 phr. The foaming effect was enhanced when the melt flow rate of the resin was higher. The addition of nano-montmorillonite improved the extrusion foaming of PE-HDs with higher melt flow rates.

关 键 词：高密度聚乙烯 挤出发泡 发泡体系 纳米蒙脱土 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]