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Catalyst for olefin polymerization, and preparation method thereof, and catalyst composition for olefin polymerization, and applications thereof

A technology of olefin polymerization and catalyst, applied in the production of bulk chemicals, etc., can solve the problems of low fine powder content, low activity, high isotacticity of polymers, etc., achieve low fine powder content, reduce initial activity, and be difficult for activity decay Effect

Active Publication Date: 2020-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of catalyst for olefin polymerization in order to overcome the shortcoming of long catalyst synthesis time, low efficiency and low activity in the pre-polymerization catalyst existing in the prior art, and the particle size of the catalyst is uniform, and its application Olefin polymerization not only has the characteristics of high activity and low fine powder content, but also is not easy to cause activity decay under normal temperature storage conditions, the polymer isotacticity is high, the fine powder content in the polymer powder is low, and the bulk density is high

Method used

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  • Catalyst for olefin polymerization, and preparation method thereof, and catalyst composition for olefin polymerization, and applications thereof
  • Catalyst for olefin polymerization, and preparation method thereof, and catalyst composition for olefin polymerization, and applications thereof
  • Catalyst for olefin polymerization, and preparation method thereof, and catalyst composition for olefin polymerization, and applications thereof

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preparation example Construction

[0098] The second aspect of the present invention provides a method for preparing the catalyst of the present invention, characterized in that the method comprises the following steps:

[0099] 1) Under the protection of an inert gas, the metal magnesium, ethanol and 2-ethylhexanol are refluxed in the presence of a halogenating agent to prepare an alkoxymagnesium carrier;

[0100] 2) In the presence of an inert diluent, the alkoxymagnesium carrier, the electron donor compound and the titanium compound are subjected to a contact reaction, washed and dried with an inert solvent to obtain a catalyst solid component;

[0101] 3) mixing the catalyst solid component with an alkane solvent, adding an organoaluminum compound for the first treatment to obtain a catalyst precursor, and then passing through the olefin for the second treatment;

[0102] 4) washing the product obtained in step 3) with alkanes and / or aromatics, filtering and drying to obtain the catalyst;

[0103] Wherein,...

preparation example 1

[0201] After fully replacing the 16L pressure-resistant reactor with agitator with nitrogen, add 10L ethanol, 300mL 2-ethylhexanol, 11.2g iodine, 8g magnesium chloride and 640g magnesium powder into the reactor. While stirring, the temperature of the system was raised to 75°C for reflux reaction. After about 5 hours of reaction, no hydrogen gas was emitted from the system, and the reaction was stopped. Wash with 3L of ethanol, filter and dry to obtain alkoxymagnesium carrier A1. The D50 of the obtained alkoxymagnesium carrier was 30.2 μm, the SPAN value was 0.81, and the m value was 0.015.

preparation example 2

[0203] After fully replacing the 16L pressure-resistant reactor with agitator with nitrogen, add 10L ethanol, 2500mL 2-ethylhexanol, 5g iodine, 40g magnesium chloride and 400g magnesium powder into the reactor. While stirring, the temperature of the system was raised to 62°C for reflux reaction. After about 8 hours of reaction, no hydrogen gas was released from the system, and the reaction was stopped. Wash with 3L of ethanol, filter and dry to obtain alkoxymagnesium carrier A2. The D50 of the obtained alkoxymagnesium support was 65.9 μm, the SPAN value was 0.65, and the m value was 0.19.

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Abstract

The invention relates to the field of olefin polymerization catalysts, and discloses a catalyst for olefin polymerization, wherein the catalyst comprises a catalyst precursor and a polymer with a structural unit represented by a formula (IV), the catalyst precursor contains an alkoxy magnesium carrier represented by a formula (I), an electron donor compound represented by a formula (II), a titanium compound represented by a formula (III) and an organic aluminum compound represented by a formula (V), and the catalyst precursor is coated with the polymer with the structural unit represented by the formula (IV). According to the invention, the catalyst is uniform in particle size distribution; the catalyst component containing the catalyst has the characteristics of high activity and low finepowder content when applied to olefin polymerization, and further has characteristics of less activity attenuation under a normal-temperature storage condition, high isotacticity of a polymer, reduced fine powder content in polymer powder and high stacking density; and the formula (1) is Mg(OEt)2-m(OEHA)m, the formula (II) is defined in the specification, the formula (III) is TiXn(OR<7>)4-n, theformula (IV) is -CH2CHR<8>-, and the formula (V) is AlR<9>nY3-n.

Description

technical field [0001] The invention relates to the field of olefin polymerization catalysts, in particular to a catalyst for olefin polymerization and a preparation method thereof, a catalyst composition for olefin polymerization and its application in olefin polymerization. Background technique [0002] Polypropylene (PP) is a thermoplastic with excellent performance and one of the five general-purpose synthetic resins. It has the advantages of low density, non-toxic, easy processing, high impact strength, flex resistance and good electrical insulation, and is widely used Used in electronic appliances, automobiles, building materials, medical treatment, packaging and other fields. At present, Ziegler-Natta (Z-N) catalyst is the main catalyst for preparing polypropylene, and more than 90% of the world's polypropylene is produced using Z-N catalyst every year. However, the initial activity of Z-N catalysts is relatively high, resulting in large temperature fluctuations in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F110/06C08F4/649
CPCC08F10/00C08F110/06C08F2500/15C08F2500/18C08F4/6494Y02P20/52
Inventor 张雅茹杨芝超张锐杜亚锋周奇龙谭忠陈江波仝钦宇徐秀东
Owner CHINA PETROLEUM & CHEM CORP
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