Single metallocene-titanium catalyst containing phosphate ester ligand and preparation method and application thereof

Abstract

The invention relates to a single metallocene-titanium catalyst containing a phosphate ester ligand and a preparation method and application thereof. The preparation method comprises the following steps: performing reaction on 0.2 mol / L titanium tetrachloride hexane solution and 0.5 mol / L phosphate ester hexane solution for 2 hours according to the mol ratio of 1.00-1.05, and obtaining greenish yellow phosphate ester titanium trichloride; performing reaction on trimethyl silicane compounds of metallocene groups, indene groups or one derivative of the metallocene groups and the indene groups, and the phosphate ester titanium trichloride for 24 hours at a temperature of between 60 and 70 DEG C according to the mol ratio of between 1.05 and 1.10, and obtaining phosphate ester dichloro-singlemetallocene-titanium; and performing reaction on phenols or alcohols, pyridine and the phosphate ester dichloro-single metallocene-titanium according to the mol ratio of between 1:1:1.05-1:1:1.1, andobtaining phosphate ester single metallocene-titanium compounds. The catalyst has a stable molecular structure in hexane and is easy to dissolve, and the synthesis method is simple and convenient, suitable for homogeneous polymerization or slurry polymerization by adopting the hexane as a solvent, and used for synthesizing homopolymers or copolymers by adopting ethylene and alpha-olefin as raw materials.

Description

technical field [0001] The invention relates to a mono-titanocene catalyst containing phosphate ligands, which is easily soluble in hexane and has relatively high polymerization activity for alpha-olefins, as well as its preparation method and application. Background technique [0002] The development of highly active olefin polymerization catalysts has always been the focus of researchers' work. In recent years, the synthesis and development of monocene ligand catalysts have been paid more and more attention. CN1065870C, CN1065871C ​​and CN1340551A provide a kind of synthetic method of oxygen-containing titanocene, the synthesized catalyst has good activity to the syndiotactic polymerization of styrene; CN1345887A and CN1593763A provide a kind of synthetic method of oxygen-containing titanocene, so The synthesized catalyst has good activity for the polymerization of ethylene or ethylene and propylene; the above-mentioned catalysts generally introduce oxygen atoms into the c...

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Problems solved by technology

CN1065870C, CN1065871C ​​and CN1340551A provide a kind of synthetic method of oxygen-containing titanocene, the synthesized catalyst has good activity to the syndiotactic polymerization of styrene; CN1345887A and CN1593763A provide a kind of synthetic method of oxygen-containing titanocene, so The synthesized catalyst has good activity for the polymerization of ethylene or ethylene and propylene; the above-mentioned catalysts generally introduce oxygen atoms into the catalyst molecule through alkoxy and phenoxy groups to stabilize the molecular structure of the catalyst, and finally compound with aluminoxane , to form an efficient catalytic system for olefin polymerization; the above-mentioned catalysts generally have poor solubility in hexane, and are not easily used in homogeneous or slurry polymerization using hexane as a solvent

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