Supported non-metallocene catalyst and preparation method and application thereof

Abstract

The invention relates to a supported non-metallocene catalyst and a preparation method thereof. The supported non-metallocene catalyst has the characteristics that the preparation process is simple, the content of a non-metallocene component is controllable, and the copolymerization effect is obvious. The invention also relates to the application of the supported non-metallocene catalyst in olefin homopolymerization / copolymerization. And compared with the prior art, the application has the characteristics that activity is high in olefin polymerization catalysis, and a polymer has high bulk density and controllable molecular weight distribution.

Description

technical field [0001] The present invention relates to a non-metallocene catalyst. Specifically, the present invention relates to a supported non-metallocene catalyst, its preparation method and its application in olefin homopolymerization / copolymerization. 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 after Ziegler, Ziegler-Natta and metallocene catalysts. The polyolefin product produced by this type of catalyst has excellent performance and low production cost. The coordination atoms of non-metallocene catalysts are oxygen, nitrogen, sulfur and phosphorus, and do not contain cyclopentadiene groups or their derivative groups, such as ind...

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Problems solved by technology

However, these patents all involve loading non-metallocene organic compounds containing transition metals on the treated carrier, and the catalyst preparation process is relatively complicated.

[0007] Catalysts supported by anhydrous magnesium chloride show high catalytic activity in olefin polymerization, but such catalysts are weak and easily broken in the polymerization reactor, resulting in poor polymer morphology

Silica-supported catalysts have good fluidity and can be used in slurry polymerization and gas-phase fluidized-bed polymerization, but pure silica-supported metallocene and non-metallocene catalysts show lower catalytic activity

Since the magnesium compound is used as a single carrier, the mechanical strength of the catalyst is low, and polymer fine powder is easily formed during the polymerization process, which affects the stable operation of the polymerization production device

[0016] Even so, the ubiquitous problem of the supported non-metallocene catalysts in the prior art is that the loading process is complicated, and in order to improve its polymerization activity, a higher amount of cocatalyst must be assisted when carrying out olefin polymerization

For the composite support formed by porous carrier and magnesium compound, such as Chinese patent 200410066068.6, and the patent PCT / CN2005 / 001737 based on its application discloses a loading method of a highly active non-metallocene catalyst and a Supported non-metallocene olefin polymerization catalyst, its preparation method and application, due to the existence of alcohol in the system, it will have an adverse effect on the performance of the non-metallocene catalyst supported on it, which limits the intrinsic performance of the non-metallocene complex fully use

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