Composite catalyst for producing polyethylene with wide molecular weight distribution as well as production method and application thereof

A wide molecular weight distribution, composite catalyst technology, applied in the production of bulk chemicals, etc., can solve problems such as limiting the effect of optimizing the composition distribution of the polymer product, the effect of broadening the molecular weight distribution is not obvious, and the activity of the composite catalyst is not fully exerted.

Active Publication Date: 2013-01-23
SHANGHAI RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the purpose of broadening the molecular weight distribution is achieved, the activity of the composite catalyst itself is not fully exerted, and the effect of broadening the molecular weight distribution is not obvious, which limits the effect of optimizing the composition distribution of the polymerization product.

Method used

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  • Composite catalyst for producing polyethylene with wide molecular weight distribution as well as production method and application thereof
  • Composite catalyst for producing polyethylene with wide molecular weight distribution as well as production method and application thereof
  • Composite catalyst for producing polyethylene with wide molecular weight distribution as well as production method and application thereof

Examples

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preparation example Construction

[0056] Firstly, the carrier is treated, and the following carriers are selected, but not limited thereto, magnesium chloride ethanol alcoholate, magnesium chloride butanediol alcoholate. The preparation method of the magnesium chloride alcoholate is to select a certain amount of magnesium chloride, add it to the flask, add a certain amount of good solvent to it, including but not limited to the following solvents, toluene, n-heptane, and then add ethanol or butanediol Alcohol, wherein the ratio of the mass of magnesium chloride to alcohol is limited to 0.5-10, preferably 1-5, the stirring temperature is between 50-200 ° C, the stirring time is 1-4 hours, and the metal organic compound is added to the flask after cooling , including but not limited to the following compounds, triethylaluminum, triisobutylaluminum, tri-n-hexylaluminum, triethylzinc. Wherein the ratio of magnesium chloride alcoholate to metal organic matter is 1: (0.5-10), preferably 1: (1-5), more preferably 1: ...

Embodiment 1

[0083] Preparation of Ziegler-metallocene composite catalyst system;

Embodiment 1a

[0085] Preparation of composite catalyst:

[0086] Preparation of carrier: under nitrogen protection, add 2 g of MgCl in a stirred reaction flask 2 , then add 50ml of toluene, and at the same time add 3.8ml of ethanol, and reflux at 130 ° C for 2 hours, cool to room temperature under stirring, add 50ml of n-hexane to stand, remove the supernatant, and wash three times. Add 50ml of n-hexane to the reaction bottle, then add 8.6ml of triethylaluminum, stir at 0°C for 1 hour, transfer to 50°C and continue to stir for 1 hour, add 50ml of n-hexane to stand still, remove the supernatant, wash three times, and vacuum dry , get the carrier.

[0087] Under the protection of nitrogen, 2 g of carrier and 0.1 g of pentamethylcyclopentadienyl titanium trichloride were added to a stirred reaction flask, while 50 ml of toluene was added, and stirred at 50° C. for 2 hours. Add 30ml of toluene and let stand, remove the supernatant, wash twice, then add 30ml of n-hexane, add 20μl of TiCl4 , st...

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Abstract

The invention relates to a composite catalyst for producing polyethylene with a wide molecular weight distribution as well as a production method and an application of the composite catalyst, wherein the composite catalyst comprises two active catalyst components loaded on a carrier, namely one catalyst component is a metallocene catalyst such as mono-cyclopentadienyl, mono-indenyl or mono-fluorenyl, and the other catalyst component is a Ziegler-Natta catalyst with a general formula of M' Xn. Under the action of only one cocatalyst, both the two catalyst components loaded on the modified inorganic carrier can exhibit higher activities, wherein the mono-cyclopentadienyl metallocene component is utilized to produce a part with a high molecular weight; the Ziegler-Natta catalyst part is utilized to produce a part with a low molecular weight; and the obtained polyethylene has characteristics of bimodal / wide molecular weight distribution. The composite catalyst provided by the invention eliminates the influences of interference and poison of different cocatalysts on the different types of catalyst components, at the same time when copolymerizing ethylene with alpha-olefin, the part with the high molecular weight, which is obtained by that the co-monomer component mainly distributes in the mono-cyclopentadienyl component, optimizes constitutions of the co-monomer and improves the performance of the polyethylene product.

Description

technical field [0001] The invention relates to a catalyst, in particular to a single-reactor composite catalyst for synthesizing polyethylene with a wide molecular weight distribution and a preparation method thereof. Background technique [0002] At present, my country's polyolefin industry is developing rapidly, but the output and performance still cannot meet the market demand, especially high-performance polyolefin materials mainly rely on imports. How to improve the performance of general-purpose polymer materials such as polyethylene has always been a hot research topic. It is well known that the mechanical properties and rheological properties of polyolefin materials have a direct impact on the molecular weight and its distribution. The higher the molecular weight of the polyolefin material, the better its mechanical properties (good mechanical properties can provide good toughness, strength and environmental stress cracking resistance (ESCR)), but this will reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/6592C08F4/645C08F4/646C08F4/68
CPCY02P20/52
Inventor 张乐天张振飞肖明威叶晓峰
Owner SHANGHAI RES INST OF CHEM IND
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