具有双峰泡孔结构的交联聚乙烯发泡材料的制备  

Preparation of Cross-linked Polyethylene Foam with Bi-modalcells Structure

作　　者：王占嘉[1] 屈中杰 陈鹏[1] 崔小利 许国志[1] 王向东[1] 周洪福[1] 

机构地区：[1]北京工商大学材料与机械工程学院,北京100048

出　　处：《塑料工业》2016年第10期104-108,共5页China Plastics Industry

基　　金：北京工商大学研究生科研能力提升计划项目;北京市大学生科学研究与创业行动计划项目(SJ201602063);北京市自然科学基金(2162012和2164058);北京市教委面上项目(KM201310011002)

摘　　要：将高密度聚乙烯(HDPE)和交联剂过氧化二异丙苯(DCP)在转矩流变仪中熔融共混,制备交联聚乙烯。通过扭矩曲线、凝胶含量测试及差示扫描量热仪(DSC)测试,研究了HDPE交联前后流变性能、凝胶含量、熔融和结晶行为的变化。利用超临界二氧化碳作为物理发泡剂对交联HDPE进行降温与降压协同釜压发泡,采用扫描电子显微镜(SEM)观察第一次压力降对双峰泡孔形成的影响,同时采用数学统计方法对大泡孔和小泡孔的尺寸分布进行了统计。最后,采用密度天平对发泡样品的表观密度进行了测试。结果表明,加入DCP后,HDPE发生了交联,形成了部分网状结构;第一次压力降为4 MPa时,材料形成的双峰泡孔较为理想。High-density polyethylene （HDPE） was mixed with dicumyl peroxide （DCP） as the crosslinking agent in a Haake internal mixer to prepare cross-linked polyethylene. The rheological properties, gel content, melt and crystallization behaviors of various HDPE samples were studied by the torque curve, gel content test, and differential scanning calorimetry （DSC）. Using supercritical carbon dioxide as the physical blowing agent, the cross-linked HDPE was foamed by the cooling and depressurization synergy method in the autoclave. The effeet of the first depressurization on the formation of bi-modal cell structure was studied by scanning electron microscope （SEM） , and the cell size distribution was counted by mathematical statistics method. Finally, the apparent density of the foamed samples was tested by the density balance. Results show that HDPE is cross-linked by mixing with DCP, resulting in the formation of the network structure. When the first depressurization is 4 MPa, the bi-modal cell structure is better.

关 键 词：高密度聚乙烯 双峰泡孔结构 超临界二氧化碳 降温与降压协同 

分 类 号：TQ328[化学工程—合成树脂塑料工业]