研究了热收缩膜专用低密度聚乙烯（LDPE）2520D的物理性能、相对分子质量分布、流变行为和热收缩性能。LDPE2520D具有较低的熔体流动速率、较高的相对分子质量、合适的密度、较好的力学性能，其熔体动态流变行为符合剪切变稀、挤出变硬的特点，加工性能良好；用LDPE2520D吹塑的薄膜的横、纵向热收缩率分别达到63.2%，68.5%，高于国家标准要求。应用试验表明，采用LDPE2520D制作的热收缩薄膜性能优异，力学性能、收缩率等均满足客户的要求。%The author studied the physical properties, relative molecular mass distribution, rheological behavior and thermal shrinkage properties of low density polyethylene (LDPE) special resin 2520D for shrink films. LDPE 2520D had lower melt flow rate, higher relative molecular mass, appropriate density and consequently good mechanical properties. The dynamic rheological behavior of 2520D melt accorded with characteristics of shear thinning and extrusion hardening, which resulted in excellent processability of the resin. The transverse and machine thermal shrinkage of blown films made of 2520D reached 63.2% and 68.5%, respectively, exceeding the national standard. The application experiments of 2520D show that the shrink films made of 2520D have outstanding performance, and the mechanical properties and shrinkage of the films meet customers′ requirements.
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