润滑剂YI对聚氯乙烯塑料流变性能的影响

Effect of Lubricant YI on Rheological Behaviour of PVC

采用毛细管流变仪，考察润滑剂ＹＩ用量对ＰＶＣ流变性能的影响。实验表明，流体非牛顿指数ｎ＜１，并随ＹＩ用量增加而下降。ＹＩ使ＰＶＣ熔体粘度大幅度减少，在硬质ＰＶＣ中，ＹＩ用量在０．６～１．０ＰＨＲ作用最明显；在软质ＰＶＣ中，当剪切速率γ＞５００ｓ－１时，少量ＹＩ就能使熔体粘度下降。并测定了不同ＹＩ用量ＰＶＣ的流动活化能，随ＹＩ用量增加，Ｅη略有下降。

The effect of lubricant YI on the rheological behaviour of PVC was studied by means capillary rheometer.The results showed the fluid non Newtonian index n was lower than 1,and decreased with the increase of YI content in PVC.The use of YI made the melt viscosity of PVC decreased greatly,which was most obvious when YI content was 0.6～1.0 phr in rigid PVC;when the shear rate was smaller than 500s -1 ,a little amount of YI would make the melt viscosity of soft PVC decrease.The flow activation energy of PVC with different contents of YI was determined. E η decreased a little with the increase of YI content in PVC,and the effect of shearing stress on E η was not obvious.