纳米碳酸钙含量对PS发泡塑料泡孔形态的影响  

Effect of Content of Nano-CaCO_3 on Cell Morphology of PS Foam

作　　者：孔磊 周南桥 朱文利 湛丹 彭响方 

机构地区：[1]华南理工大学聚合物成型加工工程教育部重点实验室华南理工大学聚合物新型成型装备国家工程研究中心,广东广州510641

出　　处：《中国塑料》2006年第2期78-81,共4页China Plastics

基　　金：教育部科学技术研究重点项目(教育司[01]224号;01138);高等教育博士学科点专项科研基金(20020561002);国家自然科学基金(10472034);国家自然科学基金重大项目(10590351)

摘　　要：在PS中加入不同含量的纳米碳酸钙作为成核剂,用自制的动态发泡模拟机研究了纳米碳酸钙含量对PS发泡塑料泡孔形态的影响。研究发现,加入不溶性的纳米碳酸钙后,PS泡孔成核更容易;并且PS中纳米碳酸钙含量的不同会影响泡孔的形态。当含量低于3％(质量分数,下同)时,纳米碳酸钙含量越高,越有利于气泡成核;而含量超过3％时,则泡孔分布变得严重不均,泡孔合并现象严重,减小了泡孔密度。当含量为3％时,制得的发泡塑料泡孔密度为8．3×107个/cm3,泡孔直径为20μm。在成型过程中施加振动进行初步实验,发现振动有利于成核剂在熔体中的分散。在纳米碳酸钙含量为3％、振幅为25 μm、振频为2．5 Hz时,制得了泡孔密度为8．7×107个/cm3、泡孔直径为17 μm的发泡塑料。PS was blended with nano-CaCO3and subsequently inflated. It was found that the content of nano-CaCO3 had major effect on the cell morphology of the foam. When the content of nano-CaCO3 was 3 wt%, a cell density of 8.3 × 10^7 cells/cm^3 and an average cell diameter of 20 μm were obtained. A vibration field may promote the dispersion of the nano-CaCO3. At vibration of an amplitude 25 μm and a frequency of 2.5 Hz, the cell density increased to 8.3 × 10^7 cells/cm^3 and the average diameter reduced to 17μm. It can be seen that nano-CaCO3 acted well as a nucleation agent. When the content of nano- CaCO3 was higher than 3 wt%, the cell density decreased and the cell size increased.

关 键 词：聚苯乙烯泡沫塑料 纳米碳酸钙 超临界二氧化碳 振动力场 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]