为提高铬系单峰小中空容器高密度聚乙烯（HDPE）专用料HD5502S的应用性能，通过与韧性较好的HDPE膜料DGDA6098按照不同比例掺混挤出造粒，分析对比不同比例掺混料的物理性能、力学性能和流变性能。结果表明：在DGDA6098掺混比例低于40%时，掺混料的加工性能较好；HD5502S/DGDA6098掺混比例在90/10~70/30范围时，掺混料的弯曲模量高达1 400 MPa以上，同时冲击强度也达到13 kJ/m²以上，具有较好的刚韧平衡性。不同温度下，随着DGDA6098掺混比例的增加，掺混料的剪切黏度（η）、剪切应力（τ）均升高，临界剪切速率（γ _c）下降；加工温度190 ℃时，小中空专用HDPE掺混料的流变性能最佳。适当的掺混比例有利于形成物理上的双峰分布，确定HD5502S/DGDA6098掺混比例为70/30、加工温度为190 ℃时，HD5502S使用的综合性能最佳。

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 (γ_c ) 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 ℃.