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Preparation method and equipment of high-performance impact polypropylene

A technology of polypropylene and propylene, which is applied in the field of polypropylene preparation and can solve the problems of not being aware of the influence of the addition method on the performance of the catalyst

Active Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventor did not elaborate on the addition of external electron donors. Obviously, he did not realize the impact of different addition methods on the performance of the catalyst in the copolymerization stage.

Method used

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  • Preparation method and equipment of high-performance impact polypropylene
  • Preparation method and equipment of high-performance impact polypropylene
  • Preparation method and equipment of high-performance impact polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The polymerization reaction was carried out on a polypropylene pilot plant.

[0051] step i

[0052] Pre-polymerization: the main catalyst (DQ-III catalyst, provided by Sinopec Beijing Aoda Catalyst Branch), co-catalyst (triethylaluminum), and the first external electron donor (tetraethoxysilane) were pre-contacted at 6°C for 20 minutes After that, continuously add the continuous stirred tank type prepolymerization reactor to carry out the prepolymerization reactor, the triethylaluminum (TEA) flow rate that enters the prepolymerization reactor is 6.33g / hr, and the tetraethoxysilane (TEOS) flow rate is 0.63 g / hr, the main catalyst flow rate is 0.01g / hr. The pre-polymerization is carried out in the environment of the propylene liquid phase body, the temperature is 15°C, and the residence time is about 4 minutes. Under these conditions, the pre-polymerization ratio of the catalyst is about 120-150 times.

[0053] After the prepolymerization, the catalyst enters the loop ...

Embodiment 2

[0060]The catalyst used in embodiment 2, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that the adding position of the second external electron donor is in the middle of the flash pipeline. The specific process conditions are shown in Table 1. The obtained pellets were subjected to a performance test, and the data are shown in Table 2.

Embodiment 3

[0062] The catalyst used in embodiment 3, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that a flash tank is installed between the flash pipeline and the gas phase reactor, and the addition position of the second external electron donor is at the top of the flash tank. The specific process conditions are shown in Table 1. The obtained pellets were subjected to a performance test, and the data are shown in Table 2.

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Abstract

The invention discloses a method and equipment for preparing impact polypropylene. The method comprises the following steps of carrying out polymerization reaction in the presence of a Ziegler-Natta catalyst, and carrying out liquid-phase bulk polymerization on propylene or propylene and alpha-olefin in the presence of a catalyst containing first external electron donors to obtain a polymer A; adding a second external electron donor to be premixed with the polymer A; and carrying out gas-phase polymerization on propylene or propylene and alpha-olefin in the presence of a material after premixing in the previous step to obtain a polymer B. By adopting the method and equipment provided by the invention, a polypropylene product comprising a continuous phase and a rubber phase is finally obtained by adopting two external electron donors with different hydrogen modulation sensitivity and controlling the addition mode of the second external electron donor; and the product has higher melt index and higher impact strength and has better impact resistance while keeping higher melt fluidity.

Description

technical field [0001] The invention relates to the field of polypropylene preparation, in particular to a method and equipment for preparing high-performance impact-resistant polypropylene by using a liquid-phase bulk method plus a gas-phase polymerization method. Background technique [0002] Impact polypropylene has excellent rigidity and impact strength, high tensile strength and flexural modulus, and has been widely used in many fields, such as molded or extruded automotive parts, home appliance parts, containers and household items. In these applications, high melt fluidity impact polypropylene has unique advantages. It can be used for one-time injection molding of large, thin-walled and complex products, and at the same time can greatly reduce the energy consumption of the processing process. research focus. Herein, the high melt fluidity impact polypropylene refers to an impact propylene copolymer with a melt flow rate > 20 g / 10 min. [0003] It is generally con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F210/06C08F2/02C08F2/34C08F4/646C08F2/01C08L23/12C08L23/14C08L23/16
Inventor 宋文波周汉学毕福勇刘国强胡慧杰魏文骏张晓萌
Owner CHINA PETROLEUM & CHEM CORP
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