A kind of supported metallocene catalyst for ethylene polymerization and preparation method thereof

A metallocene catalyst and ethylene polymerization technology, applied in the production of bulk chemicals, etc., can solve the problems of unsatisfactory industrialization requirements, unsatisfactory regulation of catalyst particle shape and particle size distribution, poor polymer particle shape, etc. Large-scale application, easy polymerization process control, and controllable morphology

Active Publication Date: 2021-10-22
吉化集团吉林市天龙催化剂有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The first object of the present invention is to provide a supported metallocene catalyst for ethylene polymerization, to solve the technical problems of unsatisfactory control of the particle shape and particle size distribution of the existing catalyst, and the poor shape of the produced polymer particles, which cannot meet the needs of industrialization

Method used

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  • A kind of supported metallocene catalyst for ethylene polymerization and preparation method thereof
  • A kind of supported metallocene catalyst for ethylene polymerization and preparation method thereof
  • A kind of supported metallocene catalyst for ethylene polymerization and preparation method thereof

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preparation example Construction

[0045] A preparation method for a supported metallocene catalyst for ethylene polymerization, specifically comprising the steps of:

[0046] ①Supercritical carbon dioxide assisted loading: add an aromatic hydrocarbon solution of metallocene compound to the polymer carrier, place it in a high-pressure reactor, pass in carbon dioxide, raise the temperature and pressurize until the carbon dioxide reaches a supercritical state, and use supercritical carbon dioxide to swell the polymer carrier;

[0047] ②Catalyst activation: After the swelling is completed, the pressure is slowly released, and nitrogen replacement is introduced for 5 to 10 times, and then a certain proportion of co-catalyst is added to the swelled catalyst intermediate to activate the catalyst;

[0048] ③Drying and forming: Add hexane solution into the reactor, wash it repeatedly for 5-10 times, remove the solvent in steps ① and ②, and dry to obtain a highly active supported metallocene catalyst.

Embodiment 1

[0051]The preparation steps of supported metallocene catalyst for ethylene polymerization are:

[0052] ①Supercritical carbon dioxide assisted loading: add 0.1mol / l (abbreviated as 0.1M, the same below) dichloro 4ml of zirconocene toluene solution is placed in a high-pressure reactor, and carbon dioxide is introduced, and the swelling penetration temperature is raised to 40°C, and the swelling pressure is increased to 10.0MPa, so that the carbon dioxide reaches a supercritical state, and the supercritical carbon dioxide is used to swell the polymer carrier 4 Hour;

[0053] ②Catalyst activation: Slowly release the pressure after the swelling is completed, cool down to room temperature, pass nitrogen into the reactor for 5 to 10 times, then add 200ml of 1M methylaluminoxane toluene solution, heat up to 60°C and reflux for 1 to 4 Hours for catalyst activation;

[0054] ③ Drying and forming: Add 500ml of hexane solution into the reactor, wash it repeatedly for 5-10 times, remove...

Embodiment 2

[0059] Except that zirconocene dichloride was replaced by bis(ethylcyclopentadiene) zirconium dichloride, the preparation method of the catalyst component was the same as in Example 1.

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Abstract

The invention discloses a supported metallocene catalyst for ethylene polymerization and a preparation method thereof. The catalyst comprises: polymer microspheres, metallocene compounds and alkylaluminum supported on the polymer microspheres, and the zirconium loading content in the catalyst is 0.1~5wt%, the aluminum content is 10~36wt%, the carrier is 59~89.9wt%; when loading, add the aromatic hydrocarbon solution of the metallocene compound to the polymer microspheres, use supercritical carbon dioxide to swell the polymer microspheres, and then add The alkyl aluminoxane is activated as a catalyst, and finally dried and shaped. The metallocene catalyst prepared by the invention has good particle shape, high polymerization activity, stable polymerization kinetics, and controllable molecular weight of polymerization products.

Description

technical field [0001] The invention belongs to the field of supported metallocene catalysts, in particular to a supported metallocene catalyst for ethylene polymerization and a method for preparing the supported metallocene catalyst by treating porous polymer microspheres with supercritical carbon dioxide. Background technique [0002] Metallocene polyethylene (mPE) is the earliest metallocene polyolefin to realize industrial production, and it is also the metallocene polymer with the largest output, the fastest practical progress, and the most research and development companies. At present, there are about a dozen large petrochemical companies in the world that can industrially produce metallocene products, but in my country, only a few polyolefin manufacturers such as Daqing Petrochemical Company, Dushanzi Petrochemical Company, and Qilu Petrochemical Company have produced metallocene polyethylene products. At the end of 2011, the Daqing Chemical Research Center of the Ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F4/02C08F4/6592C08F110/02
CPCC08F10/02C08F110/02C08F4/027C08F4/65925C08F2500/18Y02P20/54
Inventor 于广臣邓云平陈晓辉丁力
Owner 吉化集团吉林市天龙催化剂有限公司
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