Preparation method of silica gel carrier for olefin polymerization catalyst

Abstract

The invention discloses a preparation method of a silica gel carrier for an olefin polymerization catalyst. The preparation method comprises the steps of adding carbon microspheres into an acid solution to prepare an acid solution containing the carbon microspheres, then adding organic silicate ester, and then adding a sodium silicate aqueous solution to prepare a silicon source solution; adding a template agent into the silicon source solution, uniformly stirring, carrying out microwave reaction to prepare silica gel, and drying to prepare powder; and performing low-temperature plasma treatment on the obtained powder to remove the template agent, thereby obtaining the silica gel carrier. The silica gel carrier prepared by the soft and hard double-template method has the advantages of larger specific surface area, more uniform pore size and particle size distribution and the like. According to the method for preparing the silica gel carrier, the silica gel is rapidly aged through microwave heating, the reaction rate is increased, the time required by synthesis is greatly shortened, and the method has the advantages of being energy-saving, environmentally friendly and the like. According to the method for preparing the silica gel carrier, the template agent in the prepared silica gel carrier can be quickly and efficiently removed at a relatively low temperature through plasma treatment.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and in particular relates to a preparation method of a silica gel carrier used for olefin polymerization catalysts. Background technique [0002] The catalysts used in the polyolefin industry are mainly supported, and the most commonly used inorganic carriers are silica gel, alumina, montmorillonite, magnesium chloride, molecular sieves and clay, etc.; the commonly used organic carriers are polystyrene-based polymers (James CWC.Supported metallocene polymerization catalysis[J].Topics in Catalysis, 1999, 7(1):23-26.); Among them, silica gel has stable chemical properties, good acid resistance, good wear resistance, good fluidity, high melting point and low price It has become the preferred carrier for supporting olefin polymerization catalysts because of its low cost and other advantages. However, the commercial silica gel on the market usually cannot be directly used as the carrier of met...

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Problems solved by technology

However, the commercial silica gel on the market usually cannot be directly used as the carrier of metal catalysts, and the free water, continuous hydroxyl group, dihydroxyl group and free hydroxyl group on the surface will cause the metal catalyst to be poisoned and lose its activity, so it needs to be purified before use.

Another more effective method is to optimize the method of preparing silica gel, which can not only remove the components that poison the catalyst in the silica gel during the production process, but also effectively increase its specific surface area and adsorption capacity, thereby improving the catalytic efficiency of the catalyst. At present, how to prepare silica gel carrier particles with uniform pore size and particle size is still one of the challenging problems.