Alkoxy magnesium particles and application thereof

Abstract

The invention provides alkoxy magnesium particles and an application thereof. The alkoxy magnesium particles comprise reaction products of following components: 1) magnesium powder, 2) mixed alcohol,3) a halogenating agent and 4) a cross-linking agent, wherein the cross-linking agent is titanate compounds. When the alkoxy magnesium particles are applied to preparation of a catalyst for olefin polymerization, the obtained catalyst is high in activity, good in particle morphology and distributed uniformly, and stacking density of polymers is high.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a magnesium alkoxide particle and an application thereof. 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 CN1453298A generally consist of magnesium, titanium, halogen and electron-donating organic compounds as solid catalyst components. 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 high catalyst activity and stereoregularity. kind of needs. And the supported catalyst with magnesium alkoxide as the carrier c...

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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 aspects such as shape and particle diameter, it cannot be said that it is a production method that can meet the requirements.

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