PP／超临界CO2连续挤出发泡成型  

Extrusion foaming of polypropylene with supercritical carbon dioxide

作　　者：王明义[1] 王中雅[2] 周南桥 

机构地区：[1]郑州轻工业学院机电工程学院,河南郑州450002 [2]河南工业职业技术学院,河南南阳473009 [3]华南理工大学聚合物成型加工工程教育部重点实验室,聚合物新型成型装备国家工程研究中心,广东广州510640

出　　处：《合成树脂及塑料》2011年第3期13-16,共4页China Synthetic Resin and Plastics

摘　　要：以超临界CO_2为发泡剂,在连续挤出发泡过程中研究了超临界CO_2用量对高熔体强度均聚聚丙烯(PP)发泡成型过程的影响。随着超临界CO_2用量的增加,发泡挤出机口模压力降低,试样发泡倍率降低,泡孔尺寸变小,泡孔密度提高。在w(CO_2)为3%,5%时,得到发泡倍率最高为13左右的PP发泡材料。w(CO_2)为7%,发泡温度为123℃时,制备了孔径为10～30μm,泡孔密度为6.84×10~7个/cm^3的PP微孔泡沫塑料。A kind of high melt strength homopolypropylene foaming material was prepared with supereritieal CO2 as blowing agent. The effect of supercritical CO2 content on the foaming process was studied in a continuous extrusion foaming process. The die pressure of the foaming extruder, expansion ratio and cell size of the samples decreased while the cell population density increased with the augmentation of the supereritieal CO2 content. Polypropylene（PP） foams with expansion ratio as high as 13 were obtained when the mass fraction of the supercritical CO2 were 3% and 5%. Microcellular PP foams with cell size in the range of 10-30 μm and cell population density of 6.84×10^7 eells/cm^3 were produced when setting the mass fraction of supercritical CO2 at 7% and temperature at 123 ℃, respectively.

关 键 词：聚丙 烯超临界二氧化碳 发泡 挤出 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]