Zirconium tetralylmethoxyl imine complex and preparation method and application thereof

Abstract

The invention relates to a zirconium tetralylmethoxyl imine complex, a preparation method thereof, and application thereof in catalysis olefin homopolymerisation and copolymerization. In the preparation method, tetrahydronaphthol imine neutral ligand is subjected to hydrogen exchange treatment with lithium alkylide to obtain ligand lithium salt, the ligand lithium salt and zirconium halide react to obtain a product, the product is then filtered, concentrated and recrystallized to obtain the target complex finally. In the presence of a promoter, the zirconium complex can be used for catalyzingreactions such as ethylene and propylene homopolymerisation and copolymerization between ethylene and propylene, ethylene and 1-hexene, ethylene and 1-octylene, and ethylene and norbornene. Accordingto the zirconium Tetralylmethoxyl imine complex, the preparation method and application thereof, the complex has the advantages that raw materials are easy to obtain, synthesis routes of the complex are simple, yield of products is high, property of the complex is stable, the complex has high catalytic activity and can be used for preparing polyethylene, polypropylene, and copolymers of ethylene and propylene, ethylene and 1-hexene, ethylene and 1-octylene, and ethylene and norbornene which have high molecular weight and narrow range of the molecular weight, and can meet requirements of industrial sectors.

Description

technical field [0001] The invention belongs to the field of olefin coordination polymerization, and in particular relates to a tetrahydronaphthyloxyimine zirconium complex and its preparation method and application. Background technique [0002] Polyethylene (PE) is the most productive variety of general-purpose synthetic resins. According to its different molecular weight and density, it is divided into high-density polyethylene, linear low-density polyethylene, and ultra-high molecular weight polyethylene. Polyethylene has excellent processability and use performance, and is widely used in the fields of films, packaging products, hollow containers, pipes, wires and cables, etc. It has excellent low temperature resistance, impact resistance, wear resistance, chemical corrosion resistance and self-lubricating properties , has broad application prospects and has become the most widely used polymer material in the world today. LLDPE is a copolymer of ethylene and a small amo...

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Problems solved by technology

[0004] To sum up, although great breakthroughs have been made in the research of olefin polymerization catalysts, there are still many difficulties to be overcome, such as the wide molecular weight distribution of polymers, and it is difficult to control the content and composition of comonomers in polymer chains. Distribution, many catalyst synthesis steps, poor stability and other issues limit its application range in industry

[0005] The existing phenoxyimine zirconium catalyst initiates olefin polymerization, its catalytic activity is low, the molecular weight distribution of the obtained polymer is wide, and the component distribution of comonomers is uncontrollable. The possible reasons for the analysis are: 1) The electron density is low, and the electrophilic metal center is easy to react with impurities, resulting in poor stability and inactivation of the complex; 2) The steric hindrance of the imine part of the skeleton is small and lacks rigidity, and there may be a variety of Different configurations of the active center lead to a wider molecular weight distribution of the polymer, and make the polymerization process more prone to ethylene insertion, which is not conducive to the coordination insertion of α-olefin with large steric hindrance, so the composition of the copolymer is difficult to control

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