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Preparation method and application of polyolefin-coated Ziegler-Natta catalyst

A polyolefin and catalyst technology, which is applied in the preparation of catalysts and in the field of catalysts, can solve the problems of easy adhesion on the container wall and low catalyst activity.

Inactive Publication Date: 2016-05-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst activity is low, and the main catalyst particles are easy to adhere to the container wall

Method used

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  • Preparation method and application of polyolefin-coated Ziegler-Natta catalyst
  • Preparation method and application of polyolefin-coated Ziegler-Natta catalyst
  • Preparation method and application of polyolefin-coated Ziegler-Natta catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 1g of magnesium dichloride, 20ml of n-decane, 6.5ml of isooctyl alcohol, 0.1ml of ethanol into the reactor fully replaced by nitrogen, stir and heat up to 110°C, react for 2h, and the solid dissolves completely to form a uniform solution . Cool down to 50°C, add 0.5ml of tetraethoxysilane and 0.3g of sorbic acid in sequence, and react for 2h. The system was lowered to -15°C, 25ml of titanium tetrachloride was added dropwise, reacted for 1 hour, and then heated to 100°C for 2 hours. Stop stirring, let stand, separate layers, filter, wash with hexane four times (30 ml each time); stir at 0°C, add 6 ml (2M) of triethylaluminum, and react for 10 min; fill with ethylene (0.02 MPa), And react at 0°C for 10 minutes. Stop stirring, let stand, separate layers, filter, wash with hexane four times (30 milliliters each), and dry in vacuum at 70° C. for 2 hours to obtain a spherical powdery solid procatalyst with good fluidity and uniform particle size distribution.

Embodiment 2

[0044] In the reactor fully replaced by nitrogen, add 1g of magnesium dichloride, add 20ml of n-decane, add 6.5ml of isooctyl alcohol, stir and heat up to 100°C, react for 3h, and the solid is completely dissolved to form a uniform solution. Cool down to 60°C, add 0.3ml of tetraethoxysilane and 0.3g of citric acid in sequence, and react for 1.5h. The system was lowered to -10°C, 30ml of titanium tetrachloride was added dropwise, reacted for 2h, and then heated to 100°C for 2h. Stop stirring, let stand, separate layers, filter, wash with hexane four times (30 ml each time); at -5°C, stir, add 3 ml of triethylaluminum (2M), react for 5 min; fill with ethylene (0.01 MPa) , and reacted at -5°C for 10 min. Stop stirring, let stand, separate layers, filter, wash with hexane four times (30 milliliters each time), and dry in vacuum at 60° C. for 3 hours to obtain a spherical powdery solid procatalyst with good fluidity and uniform particle size distribution.

Embodiment 3

[0046] Add 1g of magnesium dichloride, 20ml of n-decane, and 10ml of isooctyl alcohol into the reactor fully replaced by nitrogen, stir and heat up to 120°C, react for 2h, and the solid dissolves completely to form a uniform solution. Cool down to 40°C, add 0.25ml of tetraethoxysilane and 0.3g of citric acid in sequence, and react for 2h. The system was lowered to 0°C, 30ml of titanium tetrachloride was added dropwise, reacted for 2h, and then heated to 90°C for 2h. Stop stirring, let stand, separate layers, filter, wash with hexane four times (30ml each time); at -10°C, stir, add 1ml of triethylaluminum (2M), react for 15min; fill with ethylene (0.05MPa) , and reacted at 10°C for 5min. Stop stirring, let stand, separate layers, filter, wash with hexane four times (30 milliliters each time), and dry in vacuum at 70° C. for 3 hours to obtain a spherical powdery solid procatalyst with good fluidity and uniform particle size distribution.

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Abstract

The invention provides a preparation method and application of a polyolefin-coated Ziegler-Natta, and belongs to the field of olefin coordination polymerization catalysts and olefin coordination polymerization. The method comprises the steps that a carrier is dispersed in inert organic solvent and makes contact with organic alcohol and a third component to form a mixture, and then the mixture makes contact with TiCl4; olefin monomers are activated by an activating agent for polymerization, and a polyolefin-coated Ziegler-Natta main catalyst is obtained. The stacking density of polyolefin can be obviously increased, static electricity of solid main catalyst particles can be eliminated, and the main catalyst particles and polyolefin particles do not stick to the container wall. The Ziegler-Natta catalyst is good in particle morphology and uniform in particle size distribution; the catalyst is excellent in hydrogen regulation performances, the melt flow rate (MFR) of polyethylene can be adjusted between 0.01 g / 10 min and 600 g / 10 min, and the stacking density of polyolefin ranges from 0.3 to 0.4; the catalyst is high in loading capacity and high in activity, the main catalyst particles and the polyolefin particles do not stick to the container wall, and the polymer is good in particle morphology, high in stacking density and less in fine powder; the preparation technology is simple, low in cost and less in environmental pollution.

Description

technical field [0001] The invention belongs to the field of olefin coordination polymerization catalyst and olefin coordination polymerization, and specifically relates to a catalyst for olefin homopolymerization or copolymerization, a preparation method and application of the catalyst. Background technique [0002] Olefin polymerization catalysts are the core of polyolefin polymerization technology. From the perspective of the development of olefin polymerization catalysts, there are two main aspects: (1) the development of polyolefin resin catalysts that can prepare special or better performance, such as metallocene catalysts (2) For the production of general-purpose polyolefin resins, on the basis of further improving catalyst performance, simplify the catalyst preparation process, reduce catalyst costs, and develop environmentally friendly technologies to improve efficiency ,Increase competitiveness. Before the 1980s, the focus of polyethylene catalyst research was on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F110/02C08F210/02C08F110/06C08F210/06C08F4/649C08F4/646C08F4/651C08F4/655
CPCC08F10/00C08F110/02C08F110/06C08F210/02C08F210/06
Inventor 黄启谷张润聪胡云跃王静李红明石向辉何磊杨万泰
Owner BEIJING UNIV OF CHEM TECH
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