Effects of Comonomer Types on Blown Film Properties of LLDPE Ester Made from a Single Metallocene Catalyst

(The Effects Of Comonomer Type On The Blown Film Performance Of LLDPE Resins Made Using A metallocene Single-Site Catalyst)

application:
The blown film performance was measured using 1-butene, 1-hexene, and 1-octene as comonomers. It was found that blown film performance improved as the wax length used increased.

Linear low density polyethylene grease is an important part of the world film market. The synthesis of these lipids requires the copolymerization of paraffin waxes such as 1-butene, 1-hexene, or 1-octene. This allows the ethylene/paraffin copolymers to have many short chain branches in the copolymerized backbone. 1 The synthesis of butene, 1-hexene, and 1-octene comonomer yields ethyl (2-C), butyl (4-C), or hexyl groups on the copolymer backbone, respectively. 6 C).

Although the differences in the molecular structure of linear low-density polyethylene-based materials made from these copolymers may appear to be insignificant, many researchers have shown that these seemingly negligible differences in the type of copolymer actually affect film blowing. Performance has a profound effect. In general, it has been discovered by scholars that blown film performance, such as bulk density, increases as the length of comonomers such as 1-butene, 1-hexene, and 1-octene increases.

The results of earlier studies cannot explain the fact that the distribution of comonomers or short-chain branches and comonomer components or the distribution of short-chain branches relative to the molecular weight affect the properties of the blown film, the type of comonomers and the comonomer The composition distribution plays a decisive role in the performance of the blown film.

Objective This study verifies the effect of the type of comonomers on the blown film properties of linear low density polyethylene greases made from metallocene catalysts. Metallocene or a single catalyst was used in the experiment so that the three different copolymers that have been prepared are essentially flat across the molecular and branch distribution characteristics. Of course, this does not exclude that the comonomers may have other special effects on the performance of the blown film.

Results In this paper, the study of polyethylene polymers was conducted using a zirconium metallocene catalyst system. The copolymerization of ethylene and other comonomers was carried out under stable slurry cycle copolymerization conditions in an experimental plant. Catalyst, ethylene, and copolymerization were used. The monomer and other reactants are continuously fed into the slurry circulation reactor and the polymer fluff is continuously extracted from the reactor; the molar ratio of the individual polymer/ethylene molecules is the same as all the lipids within the allowable experimental error. The removed fluff will be purified and purified with nitrogen to remove the solvent and unreacted paraffin wax, which will then be mixed with antioxidants and extruded into pellets after processing. The beads can be compared using rheological properties, NMR data, and gel permeation chromatography.

The copolymer was converted into a blown film in five different gauges. The basic blown film properties were tested by testing the impact compactness compactness, processing direction, and transverse tensile strength.

Although the three comonomers have many, many similarities, Figure 1 and other data also show a significant difference in the physical properties of the blown film. In particular, the 1-butene copolymer ratio of 1 is measured on the measured physical properties. The hexene and 1-octene copolymers are much lower. The compactness in FIG. 1 shows that the overall density of the 1-octene polymer is higher than that of the 1-butene material in all containers.

Conclusion In this paper, three different metallocene linear low density polyethylene greases use the same metallocene catalyst and the same synthesis conditions. In terms of rheological properties, molecular properties, thermal properties, and intramolecular or intermolecular branching distribution characteristics, these lipids are essentially identical. When the copolymers are in different containers but the same conditions, the performance of blown film will be very different, among which the performance of 1-butene grease film is the worst, and the performance of 1-hexene film is slightly better, 1-octene lipid film. The best performance. However, the reason for the difference in the properties of these films is still unknown. Future copolymers and film-like properties will help reveal the causes of the differences in film properties currently found.