Study on Properties of High-Density Polyethylene for Small-Sized Hollow Containers
In order to improve the application performance of chromium-based single-peak high density polyethylene(HDPE)special material HD5502S for small-sized hollow containers,it was extruded and granulated according to the different blending mass ratio with HDPE DGDA6098 for film with good toughness.The physical,mechanical and rheological properties of the mixture were analyzed and compared.The results showed that the processing performance of the mixtures was better when the blending mass ratio of DGDA6098 was less than 40% .When the blending mass ratio of HD5502S/DGDA6098 was in the range of 90/10～70/30,the bending modulus of the mixtures was higher than 1 400 MPa,and the impact strength was also higher than 13 kJ/m2,which had a good rigidity and toughness balance.At different temperatures,with the increase of the blending mass ratio of DGDA6098,the shear viscosity(η)and shear stress(τ)of the blends increased,and the critical shear rate(γc)decreased.When the processing temperature was 190℃,the rheological properties of HDPE mixtures for small-sized hollow containers were the best.The appropriate blending mass ratio was conducive to the formation of a physical bimodal distribution,and the comprehensive performance of the HD5502S mixtures were the best when the blending mass ratio of HD5502S/DGDA6098 was 70/30 and the processing temperature was 190℃.
Small-sized hollow containersHigh density polyethyleneBlendingMechanical propertyRheological property
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