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Metallocene polyethylene catalyst and its preparation method

A metallocene polyethylene and metallocene catalyst technology, applied in the field of polymers, can solve the problems of unspecified organic solvent moisture content, etc., achieve high catalytic ethylene polymerization activity, reduce production costs, and reduce the effect of broken rate

Active Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the present invention, this patent does not indicate the moisture content of the organic solvent used, nor does it involve the programmed cooling process of the carrier

Method used

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  • Metallocene polyethylene catalyst and its preparation method
  • Metallocene polyethylene catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] SiO 2 carrier activation process

[0059] SiO 2 The process of thermal activation of the carrier is divided into a heating section and a cooling section, as follows:

[0060] Steps in the heating section:

[0061] (1) Take quantitative 955 silica gel powder and put it into a quartz tube according to the charging coefficient of 0.6, adjust the gas flow rate to a replacement rate of 2.5, so that the SiO 2 The carrier particles are in a fluidized state.

[0062] (2) Heating the activator to raise the temperature from room temperature to 150° C. in 1.5 hours, and keep the temperature constant for 1 hour.

[0063] (3) Continue to heat the activator, raise the temperature to 600° C. in 2 hours, and keep the temperature constant for 2 hours.

[0064] Cooling section steps:

[0065] (4) Lower the temperature of the activator to 200° C. in 1 hour, and then keep the temperature constant for 0.5 hour.

[0066] (5) The temperature of the activator is continued to drop to 200...

Embodiment 2

[0073] SiO 2 carrier activation process

[0074] SiO 2 The process of thermal activation of the carrier is divided into a heating section and a cooling section, as follows:

[0075] Steps in the heating section:

[0076] (1) Weigh a certain amount of 955 silica gel powder into a quartz tube according to the filling coefficient of 0.6, and adjust the gas flow rate to a replacement rate of 2.5, so that the silica gel particles are in a fluidized state.

[0077] (2) Heating the activator to raise the temperature from room temperature to 150° C. in 1.5 hours, and keep the temperature constant for 1 hour.

[0078] (3) Continue to heat the activator, raise the temperature to 600° C. in 2 hours, and keep the temperature constant for 2 hours.

[0079] Cooling section steps:

[0080] (4) Lower the temperature of the activator to 100° C. in 2 hours, and then keep the temperature constant for 1 hour.

[0081] (5) The temperature of the activator is continued to drop to 200° C. for ...

Embodiment 3

[0088] SiO 2 carrier activation process

[0089] SiO 2 The process of thermal activation of the carrier is divided into a heating section and a cooling section, as follows:

[0090] Steps in the heating section:

[0091] (1) Weigh a certain amount of 955 silica gel powder into a quartz tube according to the filling coefficient of 0.6, and adjust the gas flow rate to a replacement rate of 2.5, so that the silica gel particles are in a fluidized state.

[0092] (2) Heating the activator to raise the temperature from room temperature to 150° C. in 1.5 hours, and keep the temperature constant for 1 hour.

[0093] (3) Continue to heat the activator, raise the temperature to 600° C. in 2 hours, and keep the temperature constant for 2 hours.

[0094] Cooling section steps:

[0095] (4) Lower the temperature of the activator to 300° C. for 3 hours, then keep the temperature constant for 2 hours.

[0096] (5) The temperature of the activator is continued to drop to 200° C. in 2 h...

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Abstract

The invention belongs to the technical field of polymers, and in particular relates to a metallocene polyethylene catalyst and a preparation method thereof. Made of SiO 2 Carrier, hydrocarbon solvent, cocatalyst and metallocene catalyst are prepared; wherein: SiO 2 The carrier is: SiO 2 or modified SiO 2 It is in a fluidized state under the condition of nitrogen gas, heating and heating, constant temperature, using gradient cooling, down to room temperature, to obtain SiO 2 carrier. The moisture content of hydrocarbon solvents is 0.1‑20ppm. The metallocene polymerization catalyst of the invention has a high loading capacity of active centers and has high catalytic ethylene polymerization activity. By controlling the cooling process of the carrier, the thermally activated carrier can better maintain the original characteristics of the silica gel carrier, reduce the damage to the silica gel carrier during the thermal activation process, and reduce the breakage rate of the carrier particles. Controlling the moisture content of the hydrocarbon solvent to 0.1-20ppm can effectively improve the loading capacity of the active center and the activity of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of polymers, and in particular relates to a metallocene polyethylene catalyst and a preparation method thereof. Background technique [0002] Metallocene catalysts, that is, organometallic complex catalysts formed by cyclopentadienyl (Cp) and its derivatives and transition metals, are current international research hotspots. A metallocene catalyst usually refers to a catalytic system composed of a metallocene compound as the main catalyst and a Lewis acid as a co-catalyst. Its catalytic polymerization mechanism has been basically recognized as the interaction between the metallocene and the co-catalyst to form a cationic catalytic active center. Metallocene compounds generally refer to a class of organometallic complexes composed of transition metal elements (such as group IVB elements titanium, zirconium, hafnium) or rare earth elements and at least one cyclopentadiene or cyclopentadiene derivative as a lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F110/02C08F4/6592C08F4/02
CPCC08F10/02C08F110/02C08F4/65925C08F4/025Y02P20/52
Inventor 周建勇李晓庆李留忠鲍春伟严婕李功韬徐晓范大鹏朱卫东齐立芳
Owner CHINA PETROLEUM & CHEM CORP
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