二次开模距离对微发泡聚丙烯材料发泡行为的影响  

Effect of Twice-open Mold Distance on Micro-foaming Behavior of Polypropylene Material

作　　者：龚维[1,2] 何颖[1] 张纯[2] 朱建华[2] 何力[2] 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550014 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014

出　　处：《塑料科技》2011年第12期38-41,共4页Plastics Science and Technology

基　　金：贵州省工业攻关项目(黔科合GY字(2011)3011);国家973前期项目(2007CB616912)

摘　　要：采用化学发泡注塑成型技术,在二次开模条件下制备微发泡聚丙烯(PP)材料;通过热力学分析法研究了二次开模距离对PP微发泡材料发泡行为的影响。结果表明:二次开模距离能有效地控制PP材料的发泡过程,二次开模距离越小,体系的发泡过程越容易自发进行。当二次开模距离L=5.3 mm时,体系中的吉布斯自由能小于零,发泡过程不可能自发进行;二次开模距离L=4.3 mm时,PP体系的发泡质量最理想,泡孔平均直径为21.6 m,泡孔密度为5.63×106个/cm3,能够获得泡孔细小、均匀的微发泡PP材料。By taking chemical foaming injection molding technology,the microcellular foam polypropylene（PP） materials were made under the condition of twice-open mold.The effect of different twice-open mold distance on foaming behavior of PP materials was analyzed by means of thermodynamic analysis.The results show that twice-open mold distance can effectively control foaming process of PP materials,the smaller twice-open mold distance,the easier spontaneously;when L is 4.3 mm,there is an ideal foaming effect in microcellular foam PP materials,average cell diameter is 21.6 m,and cell density is 5.63×106 pcs/cm3;and then the micro-foaming PP material with fine and uniform foam cell is obtained.

关 键 词：聚丙烯 二次开模距离 发泡行为 化学发泡 

分 类 号：TQ328.0[化学工程—合成树脂塑料工业]