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Method for continuously preparing polyolefin and polyolefin prepared therefrom

A technology of polyolefin and polyolefin elastomer, applied in a method and the field of prepared products, can solve the problems of small range of application of the process, unreasonable pre-polymerization feeding method, no stirring, etc.

Active Publication Date: 2019-07-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102190832A discloses a method for preparing polybutene-1 material by extrusion process, but it has the disadvantages of unreasonable pre-polymerization feeding method, no stirring, difficult discharge and small process application range

Method used

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  • Method for continuously preparing polyolefin and polyolefin prepared therefrom
  • Method for continuously preparing polyolefin and polyolefin prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1 high isotactic polybutene-1

[0063] In the S1 section, a single multi-blade stirred tank is used, heated by heat conduction oil, with built-in heating coils and heat removal coils, and the reaction temperature is controlled at 70°C. Add butene-1 monomer, cyclohexane, highly directional Ziegler-Natta catalyst, triethylaluminum, external electron donor (such as dicyclopentyldimethoxysilane), hydrogen into the reactor continuously, and the reactor The rotation speed is 10-30 rpm, the polymerization residence time is 40min, the conversion rate of butene-1 monomer is 30-35%, the isotacticity of polybutene is above 98%, and the melt index is controlled at 0.2-0.25g / 10min.

[0064] After the material enters the S2 section, additional monomer and hydrogen are added, the residence time is controlled to be 40 minutes, the reaction temperature is controlled to be 70°C, the monomer conversion rate is 20-25%, the isotacticity of polybutene is above 98%, and the melt ...

Embodiment 2

[0067] The preparation of embodiment 2 ethylene / octene copolymer elastomer

[0068] In the S1 section, a single multi-blade stirred tank is used, heated by heat conduction oil, with built-in heating coils and heat removal coils, and the reaction temperature is controlled at 90°C. Continuously add ethylene, octene-1, cyclohexane, restricted geometry catalyst, methylaluminoxane toluene solution, and hydrogen into the reactor, the reactor speed is 10-30 rpm, the polymerization residence time is 40min, and The conversion rate of ene-1 monomer is 30-35%, and the ratio of ethylene / octene is controlled so that the melting point of the polymer is 110-115°C, and the melting index is controlled between 8-10g / 10min.

[0069] After the material enters the S2 section, ethylene, octene-1 and hydrogen are added, the residence time is controlled to be 40min, the reaction temperature is controlled to be 90°C, and the conversion rate of octene-1 monomer is 20-25%, so that the melting point of t...

Embodiment 3

[0072] The preparation of embodiment 3 ethylene / propylene random copolymer elastomer

[0073] In the S1 section, two multi-blade stirred tanks are used, heated by heat conduction oil, with built-in heating coils and heat removal coils, and the reaction temperature is controlled at 80°C.

[0074] In the S1-1 section, ethylene, propylene, cyclohexane, restricted geometry catalyst, methylaluminoxane toluene solution, and hydrogen are continuously added to the reactor, the reactor speed is 20-40 rpm, and the polymerization residence time is In 20 minutes, the conversion rate of ethylene monomer is 60-70%, and the ratio of ethylene / propylene is controlled, mainly propylene, so that the melting point of the polymer is 95-100°C, and the melt index is controlled between 6-7g / 10min.

[0075] In the S1-2 section, ethylene and propylene hydrogen are continuously added to the reactor, the reactor speed is 20-40 rpm, the polymerization residence time is 20min, the conversion rate of ethyle...

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Abstract

The invention discloses a method for continuously preparing polyolefin, particularly continuously preparing a polyolefin elastomer or a mixture thereof, and polyolefin prepared therefrom. The pre-polymerization is carried out by using a kettle reactor in the preparation process, and has the function of increasing the viscosity of the reaction system to facilitate the subsequent operation of a screw reactor; the static mixing polymerization is carried out by using a static mixer in the preparation process, and is used for further increasing the viscosity of the system and prolonging the reaction residence time; and the extrusion polymerization is carried out by using a reactive screw extruder in the preparation process to achieve the polymerization reaction under a high conversion rate anda high viscosity. The preparation method can be suitable for a wide variety of polyolefin, and is particularly suitable for the preparation of the polyolefin elastomer or the mixture thereof.

Description

technical field [0001] The invention belongs to the technical field of polyolefin material preparation, and specifically relates to a method for continuously preparing polyolefin and the prepared polyolefin, in particular to a method for continuously preparing polyolefin elastomer or a mixture thereof and the prepared product. Background technique [0002] Polyolefin elastomers are widely used mainly as adhesives, hot-melt adhesives, ink additives, waterproof membranes and toughening materials, among which toughening materials are a major use of modified polypropylene or polyethylene . Polyolefin elastomers are generally copolymers of two or more olefins, which have a lower melting point or no melting point, and a lower glass transition temperature. [0003] Polyolefin plastics, such as typical high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, etc., can be produced by liquid phase bulk polymerization, gas phase polymerization or slurry pol...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F2/01C08F2/00C08F110/08C08F210/16C08F210/14
CPCC08F10/00C08F110/08C08F210/16C08F2/01C08F2/00C08F2500/15C08F2500/12C08F210/14
Inventor 李化毅
Owner INST OF CHEM CHINESE ACAD OF SCI
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