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A preparing method of an anti-shock polypropylene special-purpose material with a high melt index

A technology of polypropylene and high-melting fingers, applied in the production of bulk chemicals, etc., which can solve the problems of easy yellowing of polypropylene, limited application, and high content of volatile organic compounds

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product obtained by the peroxide degradation method has poor stability, and the prepared polypropylene is prone to yellowing, or the yellowness index is high, the content of volatile organic compounds (VOC) is high, and the odor is relatively large, which limits its application in household products and automobiles. Applications in decorative parts, food packaging, etc.

Method used

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  • A preparing method of an anti-shock polypropylene special-purpose material with a high melt index
  • A preparing method of an anti-shock polypropylene special-purpose material with a high melt index
  • A preparing method of an anti-shock polypropylene special-purpose material with a high melt index

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Embodiment 1～8

[0025] Under the joint action of the main catalyst, co-catalyst and external electron donor 1, propylene 2 undergoes pre-polymerization R1 (4L), the first loop reactor R2 (235L), the second loop reactor R3 (235L) and the gas phase Reactor R4 (950L) synthesizes polypropylene. During the synthesis process, the proportion of reaction raw materials, the amount of catalyst and the operating conditions of each reactor are shown in Table 1, Table 2 and Table 3. The indicators of polypropylene resin products are shown in Table 4

[0026] Table 1

[0027]

Cocatalyst: Propylene

Cocatalyst: external electron donor

Catalyst: Propylene

Example 1

1：6250

3

1:190000

Example 2

1：6250

1.5

1:170000

Example 3

1：6250

2.2

1:180000

Example 4

1：6250

1.8

1:180000

Example 5

1：5700

2

1:180000

Example 6

1：5700

2

1:190000

Example 7

1：6700

2

1:170000

...

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Abstract

A preparing method of an anti-shock polypropylene special-purpose material with a high melt index is disclosed. A multi-section loop process is adopted. A new external electron donor is added during polymerization. The polymerization molecular weight is controlled by adjusting the ethylene adding amount. The mass ratio of a catalyst to propylene is 1:170000-190000. The mass ratio of a cocatalyst to the propylene is 1:5700-6700. The mass ratio of the cocatalyst to the external electron donor is 1.5-3:1. Compared with present products, a product of the polypropylene special-purpose material is long in stabilization period, almost free of odor, more in high molecular weight part, wide in molecular weight distribution, long in oxidation induction time and good in antishock performance.

Description

technical field [0001] The invention relates to a method for preparing a special material for high melting finger impact polypropylene, in particular to the use of a novel external electron donor technology to obtain high melting finger impact polypropylene resin directly in the polymerization process. Background technique [0002] High flow impact polypropylene has high flow rate and good physical properties, which can make the production of large thin-wall injection products with complex structural design feasible. In the production process, the processing cycle can be shortened, the processing temperature, injection pressure and energy consumption can be reduced, and it has the advantages of good processability, excellent mold filling performance and reduced product warping and deformation. Its products are mainly used in packaging, transportation, home appliances, automobiles, offices, daily consumer goods, medical products, etc. [0003] In the prior art, in order to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F4/646C08F2/34
CPCY02P20/52
Inventor 张锋周浩胡雄单国荣
Owner CHINA PETROLEUM & CHEM CORP
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