A kind of supported metallocene catalyst and its preparation method and application

A metallocene catalyst and metallocene compound technology, applied in the field of metallocene catalysts, can solve problems such as inability to prepare bimodal polyethylene, and achieve the effects of improving catalytic polymerization activity, high polymerization activity, and improved stability

Active Publication Date: 2021-10-29
SHANGHAI DONGHUA ENVIRONMENT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the problems in the prior art that a single metallocene catalyst cannot prepare bimodal polyethylene, thereby providing a supported metallocene catalyst and its preparation method and application

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  • A kind of supported metallocene catalyst and its preparation method and application
  • A kind of supported metallocene catalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a supported metallocene catalyst and its preparation method, specifically,

[0047] Preparation of the first carrier: under nitrogen protection, add 0.65g antimony trichloride and 400ml tetrahydrofuran (THF) to the reactor, start stirring, add 13.77g silica gel (parameter: specific surface area is 220m 2 / g, the pore volume is 0.75cm 3 / g, with an average particle size of 75 μm), heated to 70°C and stirred for 2 hours, then heated to 80°C to evaporate and remove the solvent to obtain a white solid powder; the white solid powder was first vacuum-dried at 100°C for 2 hours, and then dried at 300°C After vacuum drying for 10 hours, the antimony chloride / silica carrier was obtained; under the protection of nitrogen, 4.66g of antimony chloride / silica carrier was added to the reactor, 70ml of toluene was added to disperse into a suspension, and 2.44g of triethyl base aluminum, heated to 40° C., stirred for 6 h, then washed three times with toluene, t...

Embodiment 2

[0051] This embodiment provides a supported metallocene catalyst and its preparation method, specifically,

[0052] Preparation of the first carrier: under nitrogen protection, add 0.48g antimony pentachloride and 350ml THF in the reactor, start stirring, add 7.28g silica gel in the reactor (parameter: specific surface area is 380m 2 / g, the pore volume is 1.02cm 3 / g, with an average particle size of 58 μm), heated to 65°C and stirred for 3 hours, then heated to 80°C to evaporate and remove the solvent to obtain a white solid powder; the white solid powder was first vacuum-dried at 100°C for 2 hours, and then dried at 300°C After vacuum drying for 10 hours, the antimony chloride / silica carrier was obtained; under the protection of nitrogen, 4.75g of antimony chloride / silica carrier was added to the reactor, 60ml of toluene was added to disperse into a suspension, and 1.57g of triiso Butylaluminum was heated to 60° C., stirred for 3 hours, washed three times with toluene, was...

Embodiment 3

[0056] This embodiment provides a supported metallocene catalyst and its preparation method, specifically,

[0057] Preparation of the first carrier: under nitrogen protection, add 2.49g antimony pentachloride and 350ml THF in the reactor, start stirring, add 5.31g silica gel in the reactor (parameter: specific surface area is 490m 2 / g, the pore volume is 1.30cm 3 / g, the average particle size is 50 μm), heated up to 80°C and stirred for 0.5h, then evaporated to remove the solvent to obtain a white solid powder; the white solid powder was first vacuum-dried at 100°C for 2h, and then vacuum-dried at 300°C for 10h Finally, the antimony chloride / silica carrier was obtained; under the protection of nitrogen, 2.76g of antimony chloride / silica carrier was added to the reactor, and after adding 60ml of toluene to disperse into a suspension, 2.76g of monochlorodiethyl aluminum, heated to 50° C., stirred for 4 hours, washed three times with toluene, then washed with hexane, and dried...

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Abstract

The invention belongs to the technical field of metallocene catalysts, and in particular relates to a supported metallocene catalyst and its preparation method and application. The supported metallocene catalyst provided by the present invention includes a composite carrier and a metallocene compound, and the composite carrier includes a first carrier and a second carrier; the first carrier is an inorganic carrier modified by antimony chloride and alkylaluminum, The second carrier is carboxylated polystyrene, wherein the inorganic carrier is silica or silica gel; the supported metallocene catalyst has a dual active center catalytic system, and there is a strong synergistic effect between the two active centers, which can further improve Due to the stability of the supported metallocene catalyst, polyethylene with a bimodal distribution can be obtained by applying it to the preparation of ethylene; in addition, the preparation method of the catalyst is simple in steps, easy to realize, and less difficult to operate.

Description

technical field [0001] The invention belongs to the technical field of metallocene catalysts, and in particular relates to a supported metallocene catalyst and its preparation method and application. Background technique [0002] As one of the important synthetic materials, polyolefin resin directly affects the development of national economy. At present, my country's polyolefin industry is developing rapidly, but the output and performance still cannot meet the market demand, especially the demand for high-performance polyolefin materials is growing rapidly. Therefore, how to improve the performance of general-purpose polymer materials such as polyethylene has always been a hot research topic. . [0003] Bimodal polyethylene is composed of high molecular weight polyethylene and low molecular weight polyethylene. The high molecular weight part can ensure the physical and mechanical strength of the polymer, and the low molecular weight part can improve the processing performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F4/02C08F4/659C08F212/08C08F212/36C08F220/06C08F222/02C08F220/04
Inventor 赵苑西赵小平毛菀钰赵志鹏王志豪
Owner SHANGHAI DONGHUA ENVIRONMENT ENG
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