Alpha-nickel diimine compound olefin polymerization catalyst, preparation method and method for preparing branched polyethylene

Abstract

The invention discloses an alpha-nickel diimine compound olefin polymerization catalyst, a preparation method and a method for preparing branched polyethylene. The structural formula of the alpha-nickel diimine compound olefin polymerization catalyst is shown as the formula (I) and the formula (II). The alpha-nickel diimine compound olefin polymerization catalyst has simple preparation method and low cost, and ethylene can be catalyzed to polymerize with high activity at a temperature not lower than 80 DEG C to obtain high molecular weight polyethylene. The polyethylene prepared from the alpha-nickel diimine compound olefin polymerization catalyst by catalyzing has high molecular weight, and the molecular weight can reach higher than 102x kg / mol within the range of 0-80 DEG C.

Description

(This application is a divisional application named: α-diimine nickel complex olefin polymerization catalyst and its preparation method and method for preparing branched polyethylene, application number 200910038504.1, application date 2009.4.8)) technical field The invention relates to the field of catalytic polymerization of olefins, in particular to a type of α-diimine nickel olefin polymerization catalyst and its preparation technology and a method for preparing branched polyethylene by catalyzing ethylene polymerization. Background technique Polyolefin is one of the most widely used resins. Due to its excellent processing and use properties and low price, it has become the largest output and consumption of synthetic resins in the world. It is widely used in people's production and consumption fields. Among them, the development of catalysts is the core technology for the development of the polyolefin industry and the key factor for controlling the structure and perform...

AI Technical Summary

Problems solved by technology

But the thermal stability of these diimine catalysts is poor, when R 1 For the above substituents, even if there are bulky substituents in the ortho or para position of aniline, the molecular weight of polyethylene prepared by these α-diimine nickel catalysts will decrease rapidly with the increase of polymerization temperature, generally above 60°C The catalyst rapidly decomposes and deactivates

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