釜式发泡制备氢化苯乙烯-异戊二烯-苯乙烯/聚丙烯发泡珠粒及其性能研究  

Preparation and properties of SEPS/PP foam beads through autoclave foaming

作　　者：吴加俊 曾佳 刘缓缓 朱民 倪忠斌 施冬健 陈明清 WU Jiajun;ZENG Jia;LIU Huanhuan;ZHU Min;NI Zhongbin;SHI Dongjian;CHEN Mingqing(School of Chemical and Material Engineering,Jiangnan University,Wuxi 214000,China;WuXi Hi-Tec Environmental Material Co,Ltd,Wuxi 214000,China)

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214000 [2]无锡会通轻质材料股份有限公司,江苏无锡214000

出　　处：《中国塑料》2023年第6期43-49,共7页China Plastics

摘　　要：以氢化苯乙烯-异戊二烯-苯乙烯三元共聚物(SEPS)、聚丙烯(PP)为基体,采用熔融共混、水下拉丝制备SEPS/PP母粒,利用二氧化碳(CO_(2))釜压发泡的方法,制备了具有均匀泡孔结构的SEPS/PP发泡珠粒。研究了发泡工艺对SEPS/PP发泡珠粒的泡孔尺寸、发泡倍率、堆积密度以及泡孔密度的影响。利用差示扫描量热仪(DSC)、扫描电子显微镜(SEM)分别研究了SEPS/PP在发泡过程中的结晶行为及泡孔形貌的变化。结果表明,在发泡温度为116~124℃、饱和压力为2.5~4.0 MPa以及饱和时间为0~60 min的条件下,可制备泡孔尺寸61~190μm、发泡倍率3~10,泡孔密度7.9×10^(5)~3.9×10^(7)个/cm3的SEPS/PP发泡珠粒。选取发泡倍率为5、7、10的SEPS/PP发泡珠粒,采用蒸汽成型机,探究了蒸汽成型压力对不同密度SEPS/PP泡沫板材力学性能、循环压缩性能的影响,发现以发泡倍率为10制得的SEPS/PP泡沫板材的拉伸强度、断裂伸长率最高,分别可达715 kPa、63%;发泡倍率为7的回复率最高,可达88%,具有替代热塑性聚氨酯(TPU)和乙烯-醋酸乙烯酯(EVA)发泡材料的应用前景。Hydrogenated styrene isoprene styrene(SEPS)/polypropylene(PP)masterbatch was prepared through melt blending and underwater wire drawing.The resultant SEPS/PP bead foams with a uniform cell structure were then prepared through autoclave foaming with CO_(2)as a foaming agent.The effect of foaming process on the cell size,foaming ratio,bulk density,and cell density of the bead foams were investigated.The crystallization behavior of SEPS/PP masterbatch and the change of cell size during foaming was studied by differential scanning calorimetry and scanning electron microscopy.The results indicated that the bead foams obtained a cell size of 61~190μm,an expansion ratio of 3~10,and a cell density of 7.9×10^(5)~3.9×10^(7)cells/cm3.This type of SEPS/PP bead foams could be prepared at a foaming tem-perature of 116~124℃and a saturation time of 0~60 min with a saturation pressure of 2.5~4.0 MPa.The effect of steam chest pressure on the mechanical properties and cyclic compression of the SEPS/PP foam boards with different densities were investigated by selecting the SEPS/PP foam boards with expansion ratios of 5,7,and 10 through steam chest molding.The results indicated that the foam boards exhibited the highest tensile strength of 715 kPa and the largest elongation at break of 63%when prepared at an expansion ratio of 10.A highest recovery rate of up to 88%was achieved for the foam boards at a foam ratio of 7.This foaming material exhibited great application potential to replace the thermoplastic polyurethane(TPU)and ethylene vinyl acetate(EVA)foaming materials.

关 键 词：氢化苯乙烯-异戊二烯-苯乙烯 聚丙烯 共混 发泡工艺 泡孔尺寸 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]