不同聚丙烯发泡体系的挤出发泡行为研究  

Extrusion Foaming Behavior of Different Polypropylene Foaming Systems

作　　者：王向东[1] 刘本刚[2] 陈士宏[2] 张玉霞[2] 杜中杰[1] 励杭泉[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]北京工商大学材料科学与工程系,北京100037

出　　处：《中国塑料》2006年第11期76-81,共6页China Plastics

基　　金：北京市自然科学基金资助(2062008)

摘　　要：通过热失重行为研究了不同升温速率对吸热型发泡剂(HP40P)和放热型发泡剂(AC)分解行为的影响；考察了线形聚丙烯(LPP)和长链支化聚丙烯(LCBPP)共混体系(LPP/LCBPP)的挤出发泡行为；制备了LPP/纳米黏土复合材料,并对其进行了挤出发泡研究。结果表明,吸热型发泡剂的分解区间较宽,分解过程平稳,可以作为聚丙烯挤出发泡很好的发泡剂,但需要通过提高螺杆转速来抑制分解过程中的气体损失；LPP/LCBPP/HP40P是良好的聚丙烯挤出发泡体系,可以得到泡孔直径100μm左右、泡孔密度接近10~6个/cm^3的聚丙烯挤出发泡材料；LPP/纳米黏土复合材料的挤出发泡中并未发生严重的气泡破裂和塌陷现象。动态流变性能研究结果表明该材料表现出很好的熔体弹性,可以作为聚丙烯挤出发泡的良好发泡体系。Effect of heating rates on the thermogravimetric behavior of endothermic chemical foaming agent （HP40P） and exothermic chemical foaming agent （azodicarbonamide） was studied. Extrusion foaming behavior of linear polypropylene（LPP）/long chain branching polypropylene （LCBPP） blend and LPP/nano-clay composite were investigated. The results showed that endothermic chemical foaming agent exhibited a wide decomposition temperature range. It was necessary to increase the screw rotating speed to inhibit the decomposed gas loss when the endothermic chemical foaming agent was used for polypropylene foaming, The polypropylene foam with cells about 100μm in size and cell density of near 106 cells/cm^3 was produced by the use of LPP/LCBPP/HP40P foaming system. No serious rupture and coalescence of cells were found in the extrusion foaming of linear polypropylene/nano-clay composite. Dynamic shear rheological results showed that the linear polypropylene/nano-clay composite exhibited excellent melt elasticity.

关 键 词：发泡体系 线形聚丙烯/长链支化聚丙烯共混物 线形聚丙烯/纳米黏土复合材料 挤出发泡 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]