Alkoxy magnesium granules as well as preparation method and application thereof

Abstract

The invention provides alkoxy magnesium granules which comprise reaction products of the following components: magnesium powder, a mixed alcohol, a halogenating agent, a titanate compound and an epoxyalkane compound. According to the alkoxy magnesium granules, a small amount of a mixture of halogen-containing substances is selected as the halogenating agent, the reaction can be easily controlled when the titanate compound and the epoxyalkane compound are added in the reaction process, and granule morphologies can be well maintained. The alkoxy magnesium granules provided by the invention are particularly applicable to preparation of an olefin polymerization catalyst, in polymerization of the catalyst, the polymerization activity is slowly attenuated, and the polymer granules are good in morphology, excellent in flowability and particularly applicable to devices for producing olefin by using a gaseous phase process.

Description

technical field [0001] The invention relates to an alkoxymagnesium particle for olefin polymerization, a preparation method and application thereof, a catalyst component and a catalyst for olefin polymerization, and belongs to the field of olefin polymerization catalysts. Background technique [0002] As people's demand for polyolefins increases, the requirements for olefin polymerization catalysts are also getting higher and higher. At present, the most widely used catalysts are Ziegler-Natta catalysts supported by magnesium chloride. The catalyst preparation methods disclosed in Chinese patents CN85100997A and CN 1453298A generally consist of a solid catalyst component composed of magnesium, titanium, halogen and an electron-donating organic compound. However, it is not a catalyst that can meet the requirements of various properties, such as suitable particle size and shape, uniform particle distribution, minimization of particles, high packing density, etc., as well as hi...

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Problems solved by technology

In method 2), although it is stipulated that the range of the final magnesium / ethanol addition ratio is 9 / 1-1 / 15, however, according to the researcher's discussion and test results, if the addition ratio is fixed at 9 / 1 , a sharp increase in viscosity occurs in the second half of the reaction. When the reaction rate exceeds 80%, if the stirring is not carried out sufficiently, the particles will aggregate, and uniform round particles cannot be obtained; if the stirring is forced, the particles will The shape is destroyed (patent flat 6-239521)

On the other hand, if the initial addition ratio is set at 1 / 15, so that the reaction occurs under the condition of a relatively large amount of ethanol, when the viscosity rises in the final stage of the reaction, although the stirring can be carried out smoothly, the shape of the obtained particles is not round enough. , and the capacity density is also very low, and the particles satisfying the conditions cannot be obtained

In the various methods of methods 3) to 5), other raw materials are required besides Mg and ROH, and the operation is also complicated, so it can be said that it is not preferable as a method for producing the desired fine particles

In addition, considering the shape and diameter of the particles, it is not an ideal manufacturing method.

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