加工助剂对挤出级ASA流变性能的影响  

EFFECTS OF PROCESSING AIDS ON RHEOLOGICAL BEHAVIORS OF EXTRUSION ASA

作　　者：周霆 董建廷 田冶 王斌 李荣群 辛敏琦 

机构地区：[1]上海锦湖日丽塑料有限公司,上海201107

出　　处：《工程塑料应用》2010年第12期39-42,共4页Engineering Plastics Application

摘　　要：利用熔体流动速率(MFR)仪、毛细管流变仪及转矩流变仪研究了不同种类润滑剂和丙烯酸酯(ACR)类加工助剂对挤出级(丙烯腈/苯乙烯/丙烯酸酯)共聚物(ASA)流变性能的影响。结果表明,随着不同润滑剂的添加,ASA的平衡扭矩均会出现不同程度的降低,其中聚乙烯蜡AC6A对减小ASA的平衡扭矩的效果最为明显;而ASA的平衡时间(达到平衡扭矩时的时间)则随着润滑剂种类的不同而出现不同的变化趋势,其中(乙烯/乙酸乙烯)共聚物AC400A和(乙烯/甲基丙烯酸甲酯)共聚物AC540A能够显著缩短平衡时间,促进塑化,而AC6A则会大幅延长平衡时间,延迟塑化。润滑剂的添加能够在低剪切速率下(小于1000 s-1)不同程度地降低ASA的剪切粘度,而在较高剪切速率下则会增加ASA的剪切粘度;而ACR类加工助剂则能够在整个剪切速率范围内明显提高剪切粘度。硬脂酸镁对提高ASA的MFR最为明显。The influence of types of lubricants and acrylic processing aids on the rheological properties of extrusion acrylonitrile/styrene/acrylate（ASA） resin was studied by melt flow indexer, capillary rheometer and torque rheometer. The results showed that the equilibrium torque of ASA decreased at different extent with adding different kinds of lubricants, and polyethylene wax （ e. g. AC6A） was demonstrated to be the most obvious influence on equilibrium torque. The equilibrium time of ASA, known as time to reach the equilibrium torque, exhibited different trends with various lubricants. Ethylene/vinylacetate copolymer（ e. g. AC400A） and ethylene/methyl methacrylate copolymer（e, g. AC540A ） could reduce the equilibrium time significantly, meaning promoting the plas- ticizing of ASA resin. While AC6A prolonged the equilibrium time obviously, playing a role for delaying plasticizing. An addition of lubricants would decrease the shear viscosity of ASA resin at low shear rates, especially less than 1000 s - 1 , while it showed an opposite change trend at higher shear rates. Acrylic processing aid was proved to enhance the shear viscosity obviously within the entire range of shear rates. Quasi-static melt index analysis indicated that magnesium stearate （MgSt） could enhance the meh folw index more effectively.

关 键 词：ASA 润滑剂 流变性能 丙烯酸酯类 挤出级 

分 类 号：TQ330.38[化学工程—橡胶工业]