高密度聚乙烯和硬脂酸对石蜡基粘结剂流变行为的影响  

Effect of High Density Polyethylene and Stearic Acid on Rheological Behaviors of Wax-based Binders

作　　者：肖平安[1] 利维乌.布兰杜珊 戴坤良[1] 刘素红[1] 肖广志[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]克鲁日科技大学

出　　处：《机械工程材料》2009年第10期27-29,67,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50674044);中国博士后科学基金资助项目;国家留学基金资助项目;湖南省自然科学基金资助项目(05JJ30199)

摘　　要：使用旋转式流变仪研究了加入质量分数10％～30％的高密度聚乙烯和0～9％的硬脂酸后石蜡基粘结剂在120～162℃的流变行为。结果表明：粘结剂中石蜡与高密度聚乙烯含量之比K值对其黏度有重要影响，K值越小，黏度越大；当K≥4时，提高温度和加入硬脂酸不能降低其黏度；当K〈4时，提高温度是改善粘结剂流变性能的有效手段之一，而硬脂酸加入量存在一个临界值，只有超过该值时才能有效降低黏度；随K值减小，硬脂酸临界加入量也逐步降低；粘结剂熔体在150℃下表现出类似牛顿流体的流变行为。The rheological behaviors of wax-based binders with high density polyethylene content from 10wt% to 30wt% and stearic acid （SA） content from 0 to 9wt% were studied by using rotary rhemeter in the temperature range of 120 to 162℃. The results show that the ratio of wax content to high density polyethylene content in binder, named as K, put a heavy impact on viscosity and the higher the K was, the lower the viscosity was. For a binder with K more than 4 raising temperature and adding SA showed little effect on reducing its viscosity, but raising temperature sounded an important and effective measure for those with K less than 4. Adding SA could reduce the viscosity, when its addition was over a threshold value. The threshold addition of SA decreased gradually with K decrease. The binder melt at 150 ℃ showed such rheological behaviors like a Newtonian viscous fluid.

关 键 词：粉末注射成型 粘结剂 流变行为 硬脂酸 

分 类 号：TF124.39[冶金工程—粉末冶金]