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Method for preparing polypropylene with high stereoregularity

A technology of tacticity and polypropylene, which is applied in the field of preparing high tacticity polypropylene to achieve the effect of improving tacticity

Inactive Publication Date: 2021-05-04
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are currently no reports on increasing the stereoselectivity of copolymerized polypropylene with C2 metallocene catalysts

Method used

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  • Method for preparing polypropylene with high stereoregularity
  • Method for preparing polypropylene with high stereoregularity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A 250mL three-necked flask was used as a reaction vessel, which was subjected to vacuum / removal of propylene / recycling drying. Inject 50mL of toluene into the reactor, control the temperature at 40°C, and control the pressure of propylene to be fixed at 0.1Mpa. Add 3 mL of MAO in toluene (1.4M, 4 mmol) and 1 mL of rac-Et(Ind) 2 ZrCl 2 / toluene solution (2×10 -3 M, 2×10 -6 mol). And the pressure of the whole polymerization process is controlled to be 0.1Mpa, and the reaction duration is 30min. A small amount of acidic ethanol was added to stop the reaction. Then add a large amount of ethanol to precipitate the polymer, filter the precipitate, wash with ethanol, and finally vacuum-dry at 50° C. for 10 h.

Embodiment 2

[0028] A 250mL three-necked flask was used as a reaction vessel, which was subjected to vacuum / removal of propylene / recycling drying. Take toluene (45.5mL) and (E,E,Z)-CDT (0.025mol, 4.5mL) to a total volume of 50mL, control [CDT]=0.5mol / L, add to the reactor with a syringe, control the temperature at 40 ℃, propylene at a fixed pressure of 0.1Mpa. Add 3 mL of MAO in toluene (1.4M, 4 mmol) and 1 mL of rac-Et(Ind) 2 ZrCl 2 / toluene solution (2×10 -3 M, 2×10 -6 mol). Control the pressure of the whole polymerization process to 0.1Mpa. The entire reaction time lasted 30 min, and a small amount of acidic ethanol was added to terminate the reaction. Then add a large amount of ethanol to precipitate the polymer, filter the precipitate, wash with ethanol, and finally vacuum-dry at 50° C. for 10 h.

Embodiment 3

[0030] A 250mL three-necked flask was used as a reaction vessel, which was subjected to vacuum / removal of propylene / recycling drying. Take toluene (45.5mL) and (E,E,Z)-CDT (0.05mol, 4.5mL) with a total volume of 50mL, control [CDT]=1.0mol / L, add it to the reactor with a syringe, and control the temperature at 40 ℃, propylene at a fixed pressure of 0.1Mpa. Add 3 mL of MAO in toluene (1.4M, 4 mmol) and 1 mL of rac-Et(Ind) 2 ZrCl 2 / toluene solution (2×10 -3 M, 2×10 -6 mol). Control the pressure of the whole polymerization process to 0.1Mpa. The entire reaction time lasted 30 min, and a small amount of acidic ethanol was added to terminate the reaction. Then add a large amount of ethanol to precipitate the polymer, filter the precipitate, wash with ethanol, and finally vacuum-dry at 50° C. for 10 h.

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Abstract

The invention provides a method for preparing polypropylene with high stereoregularity, which comprises the step of carrying out copolymerization reaction on cyclotriene and propylene in the presence of a C2 symmetric metallocene catalyst to obtain the polypropylene with high stereoregularity. During propylene polymerization, a small amount of large-volume cyclotriene is added as a comonomer, and a C2 symmetric metallocene catalyst is used, so that the stereoregularity of polypropylene is remarkably improved.

Description

technical field [0001] The present invention relates to a method for preparing high-tacticity polypropylene. Background technique [0002] Stereochemical control is one of the most fundamental problems in polymers. Coordination polymerization of α-olefins, on the one hand through the adjustment of monomer enantiomers during the insertion process to synthesize stereoregular poly α-olefins (such as isotactic polypropylene), on the other hand high stereoregularity α-olefins, or polyolefins tend to The crystallization makes the reaction between the weak chains of polypropylene to become a polymer material with excellent mechanical properties and heat resistance. At present, there are many studies on propylene polymerization catalyzed by C2-symmetric metallocene catalysts with enantiomeric point control. When comonomers are introduced into the polymerization reaction, the stereoselectivity of propylene insertion in C2-symmetric metallocene catalysts with point control is also af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F232/06C08F4/6592
CPCC08F210/06
Inventor 宋莎梁胜彪曹育才朱红平王伟哲刘国禹陈雄华宋昊
Owner CHINA PETROLEUM & CHEM CORP
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