POF热收缩膜用LLDPE的工业化开发

Industrial development of LLDPE resin for POF heat shrinkage film

根据多层共挤聚烯烃热收缩膜(简称POF热收缩膜)对中间层挺度和熔体强度的要求,确定了线型低密度聚乙烯DFDA-6010的熔体流动速率为0.95 g/10 min,密度为0.921 g/cm3。通过研发适合的添加剂配方以满足产品对性能的需求并确定了工业化生产的条件和参数,以国产1-己烯为共聚单体,控制1-己烯与乙烯摩尔比为0.154左右,采用气相聚乙烯冷凝技术成功开发了POF热收缩膜芯层专用树脂DFDA-6010。结果表明:DFDA-6010的横向拉伸断裂应力达33.6 MPa,纵向拉伸断裂应力达29.9 MPa。加工应用表明:DFDA-6010的各项性能与进口树脂的性能相当。

The melt flow rate of special linear low density polyethylene（LLDPE）grade DFDA-6010 for multi-layer coextrusion polyolefin（POF）heat shrinkage film is 0.95 g/10 min and density 0.921 g/cm3 based on requirements of stiffness of interlayer and melt strength of POF. The formula of the additive is developed and the technical indexes and process conditions of LLDPE are established for industrial production. DFDA-6010 is prepared by gas phase polyethylene condensation with 1-hexene as comonomer and mole ratio of two materials are controlled to 0.154. The testing results show that the transversal stretching breaking stress of the product is 33.6 MPa, and the longitudinal stress is 29.9 MPa. The applications prove that the properties of grade DFDA-6010 is equivalent to those of overseas products.