The Study Of The Processing Flow And Mechanical Properties Of UHMWPE

The main content of this article is to modify the processing flow of UHMWPE. In the context of ensuring the high impact strength and high wear resistance of UHMWPE, we improved the processing flow of UHMWPE Blends, and made it mold in molding processing equipment,for example, the ordinary twin screw extrusion equipment and the injection molding machines. The main contents include:(1) To modify the processing flow and mechanical properties of UHMWPE by using the HDPE, we have studied the influence of the content of HDPE to the blend system of UHMWPE/HDPE. The results show that the better formulation is UHMWPE: HDPE= 60:40. HDPE can not only improve the processing flow of composite materials, but also improve the compatibility of UHMWPE/HDPE blend system with modifiers.(2) To modify the blend system of UHMWPE/HDPE by using hyperbranched polyester C102 and H202 respectively, by totally comparing the processing flow and mechanical properties of the composites, we found that the modification effect of the composites C102 was obviously better than H202,and the better formulation is UHMWPE:HDPE:C102=60:40:5.(3) To modify the blend system of UHMWPE/HDPE by combining PE wax,high density PE wax and oxidized low-density PE wax respectively with stearic acid complex pairing, we achieve better results to improve the processing flow of composites by combining PE waxes and oxidized low-density PE wax respectively with stearic acid complex pairing, and the better formulation is UHMWPE:HDPE: PE Wax:stearic acid= 60:40:3:2 and UHMWPE:HDPE:oxidized low-density PE wax:stearic acid= 60:40:3:2.(4) To study the effect of molecular weight to UHMWPE composite by using different molecular weight of UHMWPE as a matrix. It was found that the oxidized of low density PE wax system is better than the PE wax system of the modification effect when the molecular weight of 2.5 million of UHMWPE is used as matrix,but the PE wax system is better than the oxidation of low density PE wax system of the modification effect when the molecular weight of 4.5 million of UHMWPE is used as matrix.(5) To optimization the front optimum formulations by using the expanded graphite. The results show that the addition of expanded graphite of the C102 blends neither improve the processing flow of composites nor make it(0.108g/10min reduced to 0.0424 g/10min)better,but worse. However, by adding expanded graphite in PE wax blends and low density oxidized PE wax blends,we achieved good effect. Adding the right amount of expanded graphite can not only improve the processing flow of the composite (PE wax system increased from 0.1766 g/10min to 0.3418g/10min, while the oxidation of low density PE wax system increased from 0.112g/10min to 0.2036 g/10min), but also improve the wear resistance the composites (PE wax system dry friction coefficient from 0.225 reduced to 0.20). We have got five optimum formulations, Their wear resistance and impact strength are better than the commercially available sample (the dry friction coefficient is 0.235, the impact strength is 33kJ/m2), the processing flow of all the formulation but one is better than the commercially available sample (the commercially available sample is 0.2239g/10min, the formulation is 0.2036 g/10min).