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

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.