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Bimodal high density polyethylene and production process thereof

A high-density polyethylene and production technology technology, applied in the field of gas-phase fluidized bed production technology, can solve the problems of low polymerization efficiency and uncontrollable composition, and achieve high polymer yield, good hydrostatic strength, good slow speed resistance. Effect of crack growth properties

Active Publication Date: 2020-03-24
JIUTAI ENERGY ZHUNGEER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems of low polymerization efficiency and uncontrollable composition in the gas-phase fluidized bed production process using an induced condensing agent. It is hoped that polymers with different properties can be produced while maintaining high polymerization efficiency. How to further improve Polymerization efficiency, composition control and preparation of bimodal high-density polyethylene with good performance need further development

Method used

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  • Bimodal high density polyethylene and production process thereof
  • Bimodal high density polyethylene and production process thereof
  • Bimodal high density polyethylene and production process thereof

Examples

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preparation example Construction

[0023] The invention provides a kind of preparation method of bimodal high-density polyethylene, comprises the steps:

[0024] Said bimodal high density polyethylene is prepared by contacting ethylene and at least one (C4-C20) alpha-olefin with a bimodal catalyst in a single gas phase reactor in the presence of hydrogen and an induced condensing agent (ICA); wherein the polymerization The temperature is 50-120°C; the molar ratio of hydrogen to ethylene is 0.06-0.12, the molar ratio of comonomer to ethylene is 0.006-0.020, and the amount of induced condensing agent accounts for 5-30 mol% of the total reactor amount.

[0025] comonomer

[0026] (C4-C20) α-olefins are linear or branched α-olefins having 4-20 carbon atoms, and exemplary α-olefins that can be used as comonomers in the present invention may include, but are not limited to, 1 -butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 4-methyl-1-pentene, 1-decene, 1-dodecene, etc., and any combination thereof ; preferably 1...

Embodiment

[0063] Polymerization was carried out in a gas phase fluidized bed reactor. The fluidized bed reactor is configured with multiple gas feed inlets and catalyst feed inlets and product discharge outlets. The polymerization reaction uses bimodal slurry catalyst BMC-200, ethylene, 1-butene, induced condensing agent, H 2 . First, the gaseous atmosphere in the reactor containing the preloaded seedbed was dried using high-purity anhydrous molecular nitrogen, and then ethylene, 1-hexene, hydrogen, and induced condensing agent were introduced according to the amounts and ratios listed in Table 1. The gas phase conditions were established to the desired operating gas phase conditions while heating the reactor to the polymerization temperature for maintenance; then the bimodal slurry catalyst BMC-200 was fed into the reactor for polymerization. The bimodal high density polyethylene of the present invention was collected from the product discharge and characterized.

[0064] Table 1: T...

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Abstract

The invention discloses a bimodal high density polyethylene and a production process thereof. In the presence of hydrogen and an induced condensing agent (ICA), contacting ethylene and at least one (C4-C20) alpha-olefin with a bimodal catalyst in a single gas phase reactor to prepare the bimodal high density polyethylene. The content of hydrogen and the induced condensing agent in the reactor is adjusted to adjust the comonomer content and the polymer yield. A pipe prepared from the bimodal high density polyethylene has good hydrostatic strength and slow crack growth resistance.

Description

technical field [0001] The application relates to a bimodal high-density polyethylene and its production process, in particular to a gas-phase fluidized bed production process for bimodal high-density polyethylene. Background technique [0002] Bimodal high-density polyethylene products have the characteristics of excellent mechanical properties and easy processing, so they are highly valued by domestic and foreign resin manufacturers and favored by users. Most of the existing bimodal high-density polyethylene is polymerized in stages through a graded reactor, which can implement uniform mixing in the reactor and has great flexibility in operation adjustment, but the production efficiency is relatively low and the cost is high. [0003] The gas-phase UNIPOL polyethylene production process of UNIVATION company in the United States is the gas-phase ethylene polymerization technology widely used at present. This process has simple production process, mild operating conditions, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/08C08F210/14C08F2/34C08F2/44C08K5/01C08L23/08
CPCC08F2/34C08F2/44C08F210/16C08K5/01C08L23/0815C08L2203/18C08F2500/05C08F2500/07C08F210/08C08F210/14
Inventor 张庆海刘鑫邵永飞卢振林刘永志安宝玉王宏亮李先亮李凤
Owner JIUTAI ENERGY ZHUNGEER CO LTD
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