Load type non-metallocene catalyst and preparation thereof

Abstract

The invention relates to a supported non-metallocene catalyst. The supported non-metallocene catalyst is obtained by a non-metallocene ligand and a transition metal compound which directly react on a carrier through an in-situ supporting method. The preparation method for the supported non-metallocene catalyst has simple and feasible process, and the supporting capacity and the polymerization activity of the catalyst have wide adjustable range. When the supported non-metallocene catalyst is combined with a catalyst promoter to catalyze the homopolymerization / copolymerization of olefins, high polymerization activities of the olefins can be obtained only by using small amount of the catalyst promoter.

Description

technical field [0001] The present invention relates to a kind of supported non-metallocene catalyst for olefin polymerization. Specifically, the present invention relates to a kind of supported non-metallocene catalyst, and it is to make non-metallocene ligand and transition metal compound by in-situ loading method Obtained by direct reaction on the carrier. By combining the supported non-metallocene catalyst of the present invention with cocatalysts such as aluminoxane or alkylaluminum, it can be used to catalyze the homopolymerization / copolymerization of olefins. Background technique [0002] The non-metallocene catalysts that appeared in the middle and late 1990s, also known as post-metallocene catalysts, the central atoms of the main catalysts include almost all transition metal elements, which have reached or even surpassed metallocene catalysts in some performance aspects, becoming The fourth generation of olefin polymerization catalysts following Ziegler, Ziegler-Nat...

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Problems solved by technology

[0011] Patent EP708116 discloses that gasified zirconium tetrachloride is contacted and loaded with a carrier at a temperature of 160-450 ° C, and then the loaded zirconium tetrachloride is reacted with a lithium salt of a ligand to obtain a supported metallocene catalyst, and then It is used for the polymerization of olefins by coordinating with co-catalysts. The problem with this catalyst is that the loading process requires high temperature and high vacuum, and is suitable for industrial production.

[0016] Nevertheless, the common problem of supported non-metallocene catalysts in the prior art is that the olefin polymerization activity is low and difficult to adjust, and in order to improve its polymerization activity, a higher amount of cocatalyst must be assisted in olefin polymerization. In addition, when using the supported non-metallocene catalysts of the prior art, the obtained polymers such as polyethylene have low polymer bulk density and poor polymer morphology. Moreover, the supported non-metallocene catalysts existing in the prior art The catalyst also has the problem of unstable performance.

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