高强度茂金属聚乙烯树脂吹膜加工性能影响研究

Study on Influence of Film Blowing Processing Performance of High Strength Metallocene Polyethylene Resin

HPR1018HA是一种极具代表性的高强度茂金属聚乙烯(PE-mLLD)薄膜专用树脂。本文探究了HPR1018HA在加工时不同加工参数对薄膜性能的影响。结果表明,随着加工温度的升高,HPR1018HA的落镖冲击性能显著改善;随着吹胀比的提升,HPR1018HA的落镖冲击性能显著提升。同时探究了HPR1018HA与常见的低密度聚乙烯(PELD)、线性低密度聚乙烯(PE-LLD)进行共混使用时薄膜性能变化的趋势。结果表明,当HPR1018HA与熔体流动速率为0.3 g/10 min的PE-LD进行共混时,当PE-LD的含量低于50%时,薄膜的拉伸强度下降18%左右,直角撕裂强度的变化率小于5%;当HPR1018HA与熔体流动速率为2.0 g/10 min的PE-LD进行共混时,薄膜的拉伸强度整体下降约为40%。当HPR1018HA与熔体流动速率为1.0 g/10 min的PE-LLD进行共混时,随着PE-LLD含量的增加,力学性能整体出现较为明显的下降,直角撕裂强度出现了明显上升。

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 PELLD.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.