Abstract:

HPR1018HA polyethylene （PE） is a type of representative high-strength metallocene PE resin special for film blowing， and it has found widely applications under a huge market capacity. HPR1018HA PE is mainly processed by blow molding. In this paper， the effect of different processing parameters on the physical properties was investigated for the films processed by use of HPR1018HA PE. The results indicated that the dart impact performance of HPR1018HA PE was significantly improved with an increase of processing temperature， and the dart impact performance of HPR1018HA PE was significantly improved with an increase of inflation ratio. Meanwhile， the variation trend of physical properties was investigated for the films processed using the blended resins of HPR1018HA PE with PE-LD and PE-LLD. The results indicated that when HPR1018HA PE was blended with less than 50 wt% of PE-LD with a melt index of 0.3 g/10 min， the tensile strength of the films decreased by about 18 %， and the variation rate of their right-angle tear strength was less than 5%. When HPR1018HA PE was blended with PE-LD with a melt flow index of 2.0 g/10 min， the tensile strength of the films decreased by about 40 %. When HPR1018HA PE was blended with PE-LLD with a melt flow index of 1.0 g/10 min， the overall mechanical properties of the films decreased significantly with the increase of PE-LLD content， and their right-angle tear strength increased significantly.

Key words: high strength metallocene polyethylene, processing window, compounding