A kind of triphenoxy biscyclopentadienyl titanium catalyst and its preparation method and application

Abstract

The invention relates to a triphenoxyl dicyclopentadiene-based titanium catalyst, belonging to the field of a macromolecular polymerization catalyst. The invention provides a triphenoxyl dicyclopentadiene-based titanium catalyst and a preparation method thereof, and a method for conducting an olefin polymerization catalytic reaction by utilizing the triphenoxyl dicyclopentadiene-based titanium catalyst so as to solve the problems of low load capacity, low catalytic activity, complicated preparation method, high usage cost and the like in the prior art. The preparation method comprises the following steps: reacting phenyl-bridged hydroxyhydroquinone with strong alkaline substances to prepare phenyl-bridged hydroxyhydroquinone salt, and then reacting together with biphenyl bitetramethylcyclopentadienyl titanium trichloride to prepare the triphenoxyl dicyclopentadiene-based titanium catalyst. The triphenoxyl dicyclopentadiene-based titanium catalyst can be used for catalyzing homopolymerization reaction of olefin as a main catalyst, and due to being as a self-loaded catalyst, the triphenoxyl dicyclopentadiene-based titanium catalyst has higher catalytic activity, therefore, the usage amount of a catalyst promoter can be reduced, and the olefin homopolymerization cost can be lowered.

Description

technical field [0001] The invention belongs to the technical field of polymer polymerization catalysts, in particular to a triphenoxybiscyclopentadienyl titanium catalyst, and further to its preparation and use methods. Background technique [0002] In recent years, in the field of research and development of olefin polymerization, metallocene catalysts have shown advantages that traditional catalysts cannot achieve, mainly in that by changing the structure of the main catalyst, for example, by adjusting the substitution effect of the main ligand and auxiliary ligand. It can realize the specific performance of catalytic olefin polymerization, such as the improvement of catalytic reaction activity, and control various parameters of the polymerization product, such as polymer bulk density, molecular weight, molecular weight distribution, polymer stereotacticity, comonomer content and composition distribution, Branching degree, crystal structure and melting point etc. It can ...

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Problems solved by technology

However, the current supported metallocene catalysts also have the following key problems: the actual loading of the catalyst is low, and the active ingredients are lost in a large amount during elution; the active active ingredients of the load are low; the amount of co-catalyst is high (alkyl aluminoxane / active metal Atomic molar ratio is 500); when used in olefin polymerization, the polymer properties are not significantly improved

Chinese patent CN135877A loads zirconocene, zirconium bisindene, etc. on magnesium chloride, and adds organic crosslinking agents such as polyols in the preparation, so that a large amount of MAO is required for the preparation, and the preparation steps are cumbersome

Japanese patents also disclose that ligands or complexes are loaded onto supports through chemical bonds, but it is not easy to load a large amount of catalysts

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