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.
出处
《塑料科技》
CAS
北大核心
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)
关键词
聚丙烯
二次开模距离
发泡行为
化学发泡
Polypropylene
Twice-open mold distance
Foaming behavior
Chemical foaming
