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A method of producing a polypropylene composition

A polypropylene composition and polypropylene technology are applied in the field of polypropylene composition production, which can solve the problems of gloss loss, no patent disclosure of polymerized ethylene and α-olefin comonomers, and stay-sequential synthesis.

Active Publication Date: 2020-09-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the methods is to add rubber-like elastomers and polypropylene blending modification, which can effectively improve the toughness of polypropylene materials, but will cause the modulus of polypropylene materials to drop very low; the second method is to add high-performance polymers For example, the blending modification of nylon and polypropylene can effectively maintain or increase the modulus of polypropylene materials, but it is only possible to improve the compatibility of high-performance polymers and polypropylene and the morphology of high-performance polymers in polypropylene matrix Improve the toughness of polypropylene material
Binary rubber toughened PP / EPR can enhance the toughness of polypropylene materials, but there is a greater loss in gloss
There are also many patent disclosures in the production of polypropylene compositions by propylene polymerization in three or more stages, European patent EP-A-2415831, and patent WO2014 / 173532, etc., but most of them stay in propylene and ethylene or propylene and α- Olefin copolymerization is sequentially synthesized in different stages, and there is no disclosure of a patent for multi-stage polymerization of ethylene and α-olefin comonomers on a polypropylene substrate

Method used

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  • A method of producing a polypropylene composition
  • A method of producing a polypropylene composition

Examples

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Effect test

Embodiment 1

[0060] exist figure 1 A method for producing a polypropylene composition is shown to produce a polypropylene composition. Under the condition that the initial temperature is 30° C. and the stirred tank reactor R1 maintains a vacuum, the stirred tank reactor R1 with a volume of 1.1 L Carry out the catalyst addition operation. The catalyst is a Ziegler-Natta catalyst, and the dosage is 58-60 mg each time. At the same time, 0.13-0.14 ml of the corresponding external electron donor dicyclopentyldimethoxysilane (DCPDMS) is added through the catalyst pipeline, and auxiliary Catalyst Triethylaluminum (TEA) 0.83-0.94ml. Use 150-250 ml of n-heptane as a solvent, and feed the catalyst into the stirred tank reactor R1 through the catalyst pipeline. Turn on the stirring and maintain the rotation speed at 500 rpm. Ensure that the liquid in the kettle is fully turbulent, add a certain amount of hydrogen through the hydrogen pipeline, and add propylene monomer through the propylene pipeli...

Embodiment 2

[0062] exist figure 2A method for producing a polypropylene composition is shown to produce a polypropylene composition. Under the condition that the initial temperature is 30° C. and the stirred tank reactor R1 maintains a vacuum, the stirred tank reactor R1 with a volume of 1.1 L Carry out the catalyst addition operation. The catalyst is a Ziegler-Natta catalyst, and the dosage is 58-60 mg each time. At the same time, 0.13-0.14 ml of the corresponding external electron donor dicyclopentyldimethoxysilane (DCPDMS) is added through the catalyst pipeline, and auxiliary Catalyst Triethylaluminum (TEA) 0.83-0.94ml. Use 150-250ml of n-heptane as a solvent, and pour it into the stirred tank reactor R1 through the catalyst pipeline. Turn on the stirring and maintain the rotation speed at 500 rpm. Ensure that the liquid in the kettle is fully turbulent, add a certain amount of hydrogen, add propylene monomer, and maintain the system pressure at 1 bar. The residence time in the pr...

Embodiment 3

[0064] Under the condition that the initial temperature is 30° C. and the stirred tank reactor is maintained in vacuum, a gas-phase seed bed sodium chloride feeding operation is carried out in a stirred tank reactor with a volume of 1.1 L. Sodium chloride needs to be roasted at a high temperature of 600°C in a muffle furnace to remove impurities and water and oxygen. Add 150ml of solid sodium chloride, and vacuumize the reaction kettle to ensure good water and oxygen conditions. The catalyst is a Ziegler-Natta catalyst, and the dosage is 58-60 mg each time. At the same time, 0.13-0.14 ml of the corresponding external electron donor dicyclopentyldimethoxysilane (DCPDMS) and the cocatalyst triethyl Aluminum (TEA) 0.83 ~ 0.94ml. Add the catalyst into the stirred tank reactor, turn on the stirring, and maintain the rotation speed at 1000 rpm. Ensure that the seed bed in the kettle is fully turbulent, add a certain amount of hydrogen, add propylene monomer, and maintain the syste...

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Abstract

The invention provides a polypropylene composition production method. A composition containing polypropylene, ethylene / alpha-olefin copolymer and propylene / alpha-olefin copolymer is produced in no less than three polymerization stages. Specifically, at least one polymerization stage produces homo-polypropylene, at least one polymerization stage produces a polypropylene and comonomer copolymer, thecomonomer is selected from ethylene and C4-C10alpha-olefin, and at least one polymerization stage produces a polyethylene or ethylene and C4-C10alpha-olefin copolymer. The obtained polypropylene composition has balanced comprehensive properties, and good matching of rigidity, gloss and toughness, and is suitable for preparation of pipes and automobile bumpers.

Description

technical field [0001] The present invention provides a method for producing a polypropylene composition comprising polypropylene, ethylene / α-olefin copolymer and propylene / α-olefin copolymer in not less than three polymerization stages. wherein at least one polymerization stage produces homopolypropylene, at least one polymerization stage produces a copolymer of polypropylene with a comonomer selected from ethylene and C4-C10 alpha-olefins, and at least one polymerization stage produces Polyethylene or ethylene and C4-C10α-olefin copolymer. The obtained polypropylene composition has balanced comprehensive properties, good rigidity, toughness, and light toughness, and is suitable for preparing pipes and automobile bumpers. Background technique [0002] With the continuous advancement of modern technology, a single homopolymer can no longer meet people's requirements for high-performance materials. The development and research of homopolymer materials encountered a bottlene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/08C08L23/16C08F110/06C08F210/16C08F210/14C08F210/06
Inventor 阳永荣蒋超孙青松蒋斌波孙婧元王靖岱黄正梁杨遥
Owner ZHEJIANG UNIV
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