Industrial development of LLDPE for POF heat shrinkable film

Industrial development of LLDPE for POF heat shrinkable film Release time: 2018-03-02 　　 China Petroleum u0026 Chemical Corporation Tianjin Branch Abstract: According to multi-layer co-extruded polyolefin heat shrinkable film (referred to as POF heat shrinkable film) on the stiffness of the middle layer And the requirements of melt strength, it is determined that the melt flow rate of linear low density polyethylene DFDA-6010 is 0.95 g/10 min and the density is 0.921 g/cm3. Through the research and development of appropriate additive formulations to meet product performance requirements and determine the conditions and parameters of industrial production, domestic 1-hexene is used as a comonomer, and the molar ratio of 1-hexene to ethylene is controlled to be about 0.154. Gas phase polymerization Ethylene condensation technology has successfully developed the special resin DFDA-6010 for the core layer of POF heat shrinkable film. The results show that the transverse tensile fracture stress of DFDA-6010 reaches 33.6 MPa, and the longitudinal tensile fracture stress reaches 29.9 MPa. Processing application shows that: the performance of DFDA-6010 is equivalent to that of imported resin. Keywords: Linear low density polyethylene heat shrinkable film special resin additive Multi-layer co-extruded polyolefin heat shrinkable film (abbreviated as POF heat shrinkable film) is a linear low density polyethylene (LLDPE) as the intermediate layer, copolymer polypropylene ( PP) As the inner and outer layers, a film with high transparency, high shrinkage and good heat-seal performance is made by co-extruding with a special process. The market capacity of POF heat shrinkable film is relatively large, about 170~180 kt/a. Among them, the amount of LLDPE is 120~130 kt/a, and it is increasing at an average annual rate of 20%~30% [1]. Limited by monomers and technical conditions, there is no LLDPE dedicated to the production of POF heat shrinkable film core in China. At present, all manufacturers use imported LLDPEDOWLEX 2045G with 1-octene as a comonomer as the middle layer of POF heat shrinkable film. In this work, through the selection of comonomers, the research of additives, the exploration and adjustment of process parameters, and the application of new catalysts, we have developed a POF heat shrinkable film that can not only meet the performance requirements of POF heat shrinkable film, but also realize continuous industrial production. The performance of LLDPE DFDA-6010 for core layer is compared with imported LLDPE DOWLEX2045G with 1-octene as comonomer. Previous: The essentials of making heat shrinkable film labels, worth seeing!