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Method for preparing polypropylene composition and polypropylene composition

A technology of polypropylene composition and propylene copolymer, which is applied in the field of polyolefin materials, can solve the problems of cumbersome polymerization process, large energy consumption, and high equipment requirements, and achieve the effects of easy industrialization, low energy consumption, and low equipment requirements

Inactive Publication Date: 2010-11-24
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to address the disadvantages of cascade reaction of multiple polymerization kettles or graded reaction of multiple polymerization kettles in most current methods for preparing polypropylene compositions, the polymerization process is cumbersome, the requirements for equipment are high, and the energy consumption is large , so as to provide a method for preparing a polypropylene composition in one step using a composite catalyst composed of a heterogeneous Ziegler-Natta catalyst and a metallocene compound catalyst

Method used

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  • Method for preparing polypropylene composition and polypropylene composition
  • Method for preparing polypropylene composition and polypropylene composition
  • Method for preparing polypropylene composition and polypropylene composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] With 0.05g composite catalyst (composite catalyst is made of heterogeneous Ziegler-Natta catalyst with spherical shape and metallocene compound Me 2 Si(Ind) 2 ZrCl 2 The composite catalyst (Me is methyl, Ind is indenyl) that forms; Me 2 Si(Ind) 2 ZrCl 2 The Zr element in the composite catalyst accounts for 0.1% of the total mass of the composite catalyst; the heterogeneous Ziegler-Natta catalyst is based on MgCl 2 Carrier containing TiCl 4 and diisobutyl phthalate catalysts with spherical morphology, where TiCl 4 The Ti element in the catalyst accounts for 2.9% of the total mass of the composite catalyst, the Ti element accounts for 3.4% of the total mass of the Ziegler-Natta catalyst, and diisobutyl phthalate accounts for 0.5% of the total mass of the Ziegler-Natta catalyst) to join 500ml In the reaction kettle, add 0.06mol of MAO, 5ml of 1-octene, 0.1L of anhydrous n-heptane, at 40°C, feed in 1 atm of propylene, react for 0.5 hours, stop the reaction with 100ml ...

Embodiment 2

[0045] Under the atmosphere of propylene monomer, 1g composite catalyst (composite catalyst is made of heterogeneous phase Ziegler-Natta catalyst with spherical morphology and metallocene compound Me 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 The composite catalyst formed (Ph is phenyl); Me 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 The Zr element in the composite catalyst accounts for 0.1% of the total mass of the composite catalyst; the heterogeneous Ziegler-Natta catalyst is based on MgBr 2 Carrier containing TiBr 4 and diethyl succinate catalysts with spherical morphology, where TiBr 4 The Ti element in the catalyst accounts for 2.9% of the total mass of the composite catalyst, the Ti element accounts for 3.6% of the total mass of the Ziegler-Natta catalyst, and diethyl succinate accounts for 1% of the total mass of the Ziegler-Natta catalyst), 4L anhydrous Add heptane to the reactor, add 400ml 1-octene, 0.5mol MAO, and 0.5mol dimethoxydiphenylsilane in sequence, the pressure of the propylene m...

Embodiment 3

[0047] Operation is the same as in Example 2, except that the amount of 1-octene added is 600ml. The results are shown in Table 1.

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Abstract

The invention belongs to the field of polypropylene materials, in particular relates to a method for preparing a polypropylene composition by a one-step polymerization process, and the polypropylene composition prepared by the method. The polypropylene composition of which the structure and performance can be adjusted in a wide range is synthesized through a composite catalyst prepared from a heterogeneous Ziegler-Natta catalyst and a metallocene catalyst. A propylene homopolymer is synthesized through the Ziegler-Natta catalyst component in the composite catalyst in propylene homopolymerization, a propylene copolymer is synthesized through the metallocene catalyst component in the polymerization of propylene and advanced alpha-olefin monomer, and the propylene copolymer generated in the polymerization is uniformly dispersed in the propylene homopolymer to form the polypropylene composition. The propylene copolymer is prepared by copolymerization of the propylene and the alpha-olefin, wherein the alpha-olefin accounts for 1 to 85 mass percent of propylene copolymer, and the propylene copolymer accounts for 3 to 95 percent of the total mass of the polypropylene composition.

Description

technical field [0001] The invention belongs to the field of polyolefin materials, and in particular relates to a preparation method of a polypropylene composition and a polypropylene composition prepared by the method. Background technique [0002] Polypropylene has a wide range of uses, such as spinning, blown film, and injection extrusion to prepare various polypropylene molding materials such as fiber products, films, and pipes. In addition, due to the high melting point of polypropylene (isotactic), it is applicable in a wide temperature range. However, polypropylene has poor toughness, especially poor low-temperature impact properties, which limits its use as engineering materials in some special fields. Therefore, in order to broaden the application range of polypropylene, the research on the modification of polypropylene has been developed extremely rapidly. Among them, the modification research for the purpose of improving the impact strength of polypropylene (PP)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L23/20C08F110/06C08F210/06C08F210/14C08F2/02C08F2/14C08F4/685C08F4/6592
Inventor 贺爱华毕福勇韩志超
Owner INST OF CHEM CHINESE ACAD OF SCI
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