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Olefin polymerization catalyst, preparation method thereof and preparation method of polyethylene

A technology for olefin polymerization and catalyst, which is applied to the preparation of polyethylene, its preparation, and the field of olefin polymerization catalyst, which can solve the problems of difficulty in meeting product requirements and low melting point of polyethylene.

Active Publication Date: 2015-03-25
芜湖万隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the melting point of polyethylene prepared by the existing technology is not high, only 135-137 ° C, and the melting point of polyethylene obtained by industrial mass production is even lower, only 126-130 ° C, which is difficult to meet the product needs of more fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0063] The invention provides a kind of preparation method of olefin polymerization catalyst, comprises the following steps:

[0064] A) reacting porous polymer microspheres with alkylmagnesium chloride in a solvent to obtain a reaction product, and the pore diameter of the polymer microspheres is 10-25 nm;

[0065] B) TiCl 4 React with the reaction product obtained in step A) in a solvent to obtain the main catalyst;

[0066] C) mixing the organic matter of aluminum with the main catalyst obtained in the step B) and performing a reaction to obtain an olefin polymerization catalyst.

[0067] In the present invention, the porous polymer and alkylmagnesium chloride are reacted in a solvent to obtain a reaction product. In the present invention, the porous polymer microspheres are preferably stored in vacuum at 70-90°C for 12-24 hours, then cooled to room temperature, and then The porous polymer microsphere reacts with the alkylmagnesium chloride in a solvent to obtain a reacti...

Embodiment 1

[0087] 1) Preparation of polystyrene seed microspheres

[0088] Add 10g styrene, 44g ethanol, 44g ethylene glycol monomethyl ether, 0.1g azobisisobutyronitrile and 2gPVPK-30 in a 250ml four-neck flask equipped with mechanical stirring, reflux condenser, nitrogen conduit and thermometer, Set the stirring speed to 120rpm, insert the nitrogen gas conduit below the liquid level for 30 minutes, then move the nitrogen gas conduit above the liquid level, turn on the cooling water, raise the temperature of the system to 70°C, and stop the reaction after stirring continuously for 24 hours. Centrifuge the precipitate, remove the upper liquid, wash the precipitate three times with ethanol and water, and then dry it in a vacuum oven for 24 hours to obtain polystyrene seed microspheres with a particle size of 3.6 μm.

[0089] 2) The first step of swelling

[0090] Preparation 200g mass concentration is the ethanol aqueous solution of 0.25% sodium dodecylsulfonate, the mass ratio of ethano...

Embodiment 2

[0103] Polyethylene with a number average molecular weight of 100,000 was prepared according to the preparation method in Example 1, except that the reaction pressure in step 6) in this example was 9 atm.

[0104] In the present invention, the polyethylene obtained in this embodiment is subjected to a differential calorimetry scanning (DSC) test according to the above technical scheme, and the result shows that the polyethylene obtained in this embodiment has a melting point of 140.0°C.

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PUM

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Abstract

The invention provides an olefin polymerization catalyst. The olefin polymerization catalyst comprises a carrier and a Ziegler-Natta catalyst carried by the carrier, wherein the carrier is a porous polymer microsphere, the pore size of the porous polymer microsphere is 10-25nm, and the Ziegler-Natta catalyst is carried by the porous polymer microsphere carrier with a pore size of 10-25nm to obtain the olefin polymerization catalyst. In the process of carrying out catalytic polymerization on ethylene by using the olefin polymerization catalyst, once generated, the PE (polyethylene) molecular chains are entangled mutually due to the specific pore size of the porous polymer microsphere, and the PE molecular chains are difficult to unentangle, thus the movement of the PE molecular chain is hindered, and the melting point is increased to the temperature of143 DEG C. The invention further provides a preparation method of the olefin polymerization catalyst and a preparation method of PE.

Description

technical field [0001] The invention belongs to the field of polymer synthesis, and in particular relates to an olefin polymerization catalyst, a preparation method thereof and a preparation method of polyethylene. Background technique [0002] Polyolefin materials are the most commonly used and one of the most important polymer products in modern life. Since its inception, it has maintained a good development trend, and its output has increased year by year. In 2002, the global polyolefin resin output reached 88Mt, accounting for 51.2% in 2002 from 43.8% in 1992 in the total output of synthetic resin. Polyolefin resin is a kind of polymer material with the largest output and wide application due to its abundant raw materials, low price, easy processing and molding, and excellent comprehensive performance. Among them, polyethylene and polypropylene are the most important, and polyethylene and polypropylene have become the most important 10,000-ton plastic products in the wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F10/02C08F4/02C08F4/645C08F212/08C08F212/36C08F220/44C08J9/28
Inventor 周光远王魁雷金化聂赫然
Owner 芜湖万隆新材料有限公司