多级磨盘式强剪切分散混炼器作用下PP/nano-CaCO_3体系性能的研究  

Research on Property of PP/Nano-meter CaCO_3 System by Action of Multi-stage-mill Mixer

作　　者：王朝虹[1] 周海英[1] 雷军[1] 申开智[1] 

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065

出　　处：《塑料工业》2007年第1期49-52,共4页China Plastics Industry

基　　金：国家自然科学基金重大项目(10590350)

摘　　要：为了改善填充和共混体系的混炼和分散效果,自行研制了一套高性能混炼设备(多级磨盘式强剪切分散混炼器),并利用此设备研究了PP／nano-CaCO_3体系的稳态流变性、动态流变性和分散性的变化及其影响因素。实验结果表明,未加抗氧剂时,随着混炼器转速的提高,填充体系的MFR增加；nano-CaCO_3的加入整体上改善了体系的流变性。当nano-CaCO_3的质量分数为4％时,MFR出现最大值。加入抗氧剂之后,PP填充体系中不再有自由基引发的降解反应发生,混炼器转速的提高使填充体系的MFR增加的幅度很小；混炼器的作用导致填充体系的动态贮能模量、损耗模量和复数黏度都下降；经混炼器作用后的填充体系中纳米碳酸钙粒子的分散状态明显优于未经混炼器作用的体系。A multi-stage-mill compounding mixer with high performance was developed to improve the effect of mixing and dispersing of blends and hence the properties. The mixer had intense shear and dispersion force. The rheological behavior and dispersibility of PP/nano-meter CaCO3 were studied by means of the above mixer. The resuits showed when no antioxidants was used, the MFR of the blend increased with the increase of the rotating speed of the mixer, and the use of nano-meter CaCO3 improved the rheological properties of the blend. When the mass fraction of nano-meter CaCO3 was 4%, the MFR was the maximum. The addition of antioxidants removed the degradation reaction caused by free radicals in the blend. The increase of the rotating speed of the mixer had little effect on the increase of the MFR of the blend. The action of the mixer caused decreases of the dynamic energy storage modulus, loss modulus and complex viscosity of the blend. The dispersion of the nano-meter CaCO3 in the blend acted by the mixer was obviously better than that of the nano-meter CaCO3 in the blend not acted by the mixer.

关 键 词：混炼器 聚丙烯 纳米碳酸钙 分散性 流变性 

分 类 号：TQ320.06[化学工程—合成树脂塑料工业]