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The Effect of Rheological Property on High-Density Polyethylene (HDPE) by Different Lubricants

Author: YinWenYan
Tutor: FengShaoHua
School: Qingdao University of Science and Technology
Course: Materials Science
Keywords: Rheological properties Wall slip High density polyethylene Lubricant Constant pressure capillary rheometer Constant speed capillary rheometer
CLC: TQ325.6
Type: Master's thesis
Year: 2006
Downloads: 288
Quote: 1
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Abstract


Using the new constant-speed type dual capillary rheometer, the constant pressure type capillary rheometer , a systematic study of the extreme flow conditions ( ultra-high shear rate, and ultra - high shear stress) , high density polyethylene (HDPE) melts at Rules and mechanisms of different temperature extrusion distortion , wall slip melt fracture . Focus on the melt and the extrusion die of the dynamic interface the adsorption (interface mechanism) , and the entanglement of the polymer chains of the polymer molecular structure and the different flow layer reconciliation tangles, orientation reconciliation alignment ( molecular mechanism ) on the melt flow is not the impact of the stability of a nonlinear viscoelastic polymer melt is discussed from the angle of \Meanwhile, the experimental results show that a different high density polyethylene rheology . Meanwhile, in order to improve melt extrusion flow instabilities , in the high-density polyethylene were added to the polyethylene wax , the fluorine-containing elastomer and a polyethylene wax compound lubricants . The experiments show that at low shear rates , the fluorine - containing elastomer flowability-improving effect on the high-density polyethylene , polyethylene wax , a fluorine - containing elastomer / polyethylene wax composite lubricant is added at the same time , to a certain extent improve melt extrusion stability, but still can not be improved under a high shear rate of melt extrusion instability . In order to further improve the melt flow instability, stearate was added to the rare earth salt in a high density polyethylene / polyethylene wax composite lubrication system and found that the lubrication system than the fluorine-containing elastomer / polyethylene wax compound lubrication system , as well as commonly used hard lipid formate / polyethylene wax lubrication system , and more effective to improve the fluidity of the melt . Added to the lubrication system , the polymer melt is extruded under the higher shear rate of the surface is smooth , melt slip when the shear rate increases , the occurrence of the pressure oscillation signal weakened . Experiment proved the lanthanum salts stearate / polyethylene wax composite lubricant can significantly improve the efficiency of the extrusion of high density polyethylene .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polyethylene ether base class
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