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Preparing method and application of catalyst for preparation of high-spherical low-particle-size polyolefin particles

A technology of high sphericity and polyolefin, which is applied in the field of olefin polymerization, can solve the problems of damage to the integrity of polymer chains, unfavorable processing, and increased processing costs, and achieve the effect of reduced particle size, reduced bulk density, and simple methods

Active Publication Date: 2015-08-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although physical and mechanical pulverization can reduce the particle size of polyolefins, it will firstly increase the processing cost, and secondly, this method will damage the chain integrity of the polymer, which may be detrimental to subsequent processing.

Method used

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  • Preparing method and application of catalyst for preparation of high-spherical low-particle-size polyolefin particles

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preparation example Construction

[0045] As mentioned above, the present invention discloses a method for preparing a catalyst for preparing polyolefin particles with high sphericity and low particle size, which includes the following steps:

[0046] (a) Mixing magnesium halide, alcohol compound, adjuvant, part of internal electron donor and solvent to prepare mixture I;

[0047] (b) Add the above-mentioned mixture I to the reactor, preheat it to -30°C-30°C, and add titanium compound dropwise; or,

[0048] Add the titanium compound to the reactor, preheat it to -30°C-30°C, and add the above mixture I dropwise;

[0049] (c) After the dripping is completed, the reaction system is heated to 90°C to 130°C in 30 minutes to 3 hours, and the remaining internal electron donor is added to continue the reaction;

[0050] (d) Filter out the liquid in the reaction system, add the remaining titanium compound, and continue the reaction;

[0051] (e) After the reaction is completed, post-treatment to obtain the catalyst.

[0052] Accord...

Embodiment 1

[0063] In the reactor fully replaced by high-purity nitrogen, add 4.94g of anhydrous magnesium chloride, 18.9g of isooctyl alcohol, 30ml of decane, increase the temperature to 130℃ with stirring and maintain for 2 hours, then add 2.65g of tetrabutyl titanate The ester and 2.05 g of diisobutyl phthalate were reacted at 130°C for another 1 hour, and finally cooled to room temperature to form a uniform transparent solution, which was Mixture I.

[0064] Add 200ml of titanium tetrachloride to the reaction kettle, stir and preheat to 0°C, and add mixture I to the titanium tetrachloride dropwise for about 2 hours. After the dropwise addition was completed, the temperature began to increase, and the temperature was increased to 110°C within 2 hours. 1.23 g of diisobutyl phthalate, an internal electron donor, was added. After reacting at this temperature for 2 hours, the reaction liquid was removed, and 200 ml of titanium tetrachloride was added again, and the reaction was carried out f...

Embodiment 2

[0067] In the reactor fully replaced by high-purity nitrogen, add 4.94g of anhydrous magnesium chloride, 18.9g of isooctyl alcohol, 30ml of decane, increase the temperature to 130℃ with stirring and maintain for 2 hours, then add 2.65g of tetrabutyl titanate The ester and 2.05 g of diisobutyl phthalate were reacted at 130°C for another 1 hour, and finally cooled to room temperature to form a uniform transparent solution, which was Mixture I.

[0068] The mixture I was added to the reaction kettle, stirred and preheated to 0°C, and 100 mL of titanium tetrachloride was dropped into the reaction kettle for about 1 hour. After the dropwise addition was completed, the temperature began to rise, and the temperature rose to 110°C within 2 hours. 1.23 g of diisobutyl phthalate, an internal electron donor, was added. After reacting at this temperature for 2 hours, the reaction liquid was removed, and 200 ml of titanium tetrachloride was added again, and the reaction was carried out for 2...

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Abstract

The invention provides a preparing method of catalyst for preparation of high-spherical low-particle-size polyolefin particles. The catalyst is used for olefinic polymerization, the prepared polyolefin particles are of high sphericalness, small particle size (averagely 50 micrometers to 30 micrometers), narrow particle size distribution and low bulk density (0.1g / mL to 0.4g / mL). By means such as adjusting the forming temperature of a catalyst carrier and forming time of the catalyst and using any added nanoparticle as a third component for accelerating the formation of the catalyst, the catalyst is of small particle size and high sphericalness; according to replication of heterogeneous catalysts, submicron polyolefin spherical particles are prepared.

Description

Technical field [0001] The invention relates to the technical field of olefin polymerization, and more specifically, to a preparation method and application of a catalyst for preparing polyolefin particles. Background technique [0002] Ziegler-Natta catalyst is an organometallic catalyst used to synthesize unbranched, highly stereoregular polyolefins, also known as Ziegler-Natta initiator, which belongs to coordination polymerization initiation Agent. In 1956, Ziegler, a German organic chemist, first discovered TiCl 4 / Et 3 The Al system can effectively catalyze the polymerization of ethylene under lower pressure. Then the Italian chemist Natta developed this catalytic system for the isotactic polymerization of propylene, butadiene, isoamylene, etc. These catalysts were later called Geller-Natta catalyst. [0003] From the invention of Ziegler-Natta catalysts in the 1950s to the present decades, Ziegler-Natta catalysts have been continuously updated and replaced by the original ...

Claims

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Application Information

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IPC IPC(8): C08F110/06C08F4/649C08L23/12B29C67/24B33Y70/00
Inventor 李化毅罗志张辽云胡友良
Owner INST OF CHEM CHINESE ACAD OF SCI
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