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Polymerization method of anti-impact propylene copolymer having high melt flowability

A propylene copolymer and fluidity technology, which is applied in the field of producing impact propylene copolymer with high melt fluidity, can solve the problems of conflicting requirements of different catalysts, no consideration, and limitation of molecular structure control of impact copolymer polypropylene products.

Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of different external electron donors can complement each other after mixing, it still cannot solve the problem that the two-step reaction has different requirements for the catalyst.
For example: Patent WO2003 / 059966 mentions that two kinds of external electron donors with different hydrogen sensitivity are used successively during the homopolymerization of propylene in a gas-phase plug-flow reactor, and are added in stages to obtain a high melting index or A homopolymer with a wide molecular weight distribution, but in the copolymerization stage of its described polymerization process, the difference between the polymerization reaction and the homopolymerization stage is not considered to change the external electron donor component in the catalyst composition, so its production The performance of the catalyst in the copolymerization stage of the rubber phase is consistent with that in the homopolymerization stage
Therefore, this technology still exists. The molecular structure control of impact copolymerized polypropylene products is limited by the shortcomings of the aforementioned existing technologies.

Method used

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  • Polymerization method of anti-impact propylene copolymer having high melt flowability
  • Polymerization method of anti-impact propylene copolymer having high melt flowability
  • Polymerization method of anti-impact propylene copolymer having high melt flowability

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The main catalyst (titanium-containing solid catalyst active component) is prepared by the method described in Example 1 of Chinese Patent CN93102795, its Ti content: 2.4wt%, Mg content 18.0wt%, di-n-butyl phthalate content: 13wt %.

[0043] The polymerization reaction was carried out on a polypropylene pilot plant.

[0044] Pre-polymerization: After the main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (methylcyclohexyldimethoxysilane) are pre-contacted at 10°C for 20 minutes, they are continuously added to the pre-polymerization reactor for pre-polymerization. Polymerization reactor, the flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of methylcyclohexyldimethoxysilane (CHMMS) is 0.63g / hr, and the flow of main catalyst is 0.01g / hr 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 minu...

Embodiment 2

[0053] 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 first external electron donor in Example 2 is diisobutyldimethoxysilane (DIBMS). The specific process conditions are shown in Table 1.

Embodiment 3

[0055] The catalyst used in embodiment 3, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that the first external electron donor in Example 3 is tetraethoxysilane (TEOS). The specific process conditions are shown in Table 1.

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Abstract

The invention provides a polymerization method of an anti-impact propylene copolymer having high melt flowability. The method comprises the steps that in different reaction stages of propylene polymerization, a combination of a homopolymer continuous phase having high melt index and a large-molecular-weight high-content rubber phase is obtained through controlling the addition types and addition amounts of an external donor component in a Ziegler-Natta catalyst system in different reaction stages according to the requirement of a target product, so as to obtain the anti-impact polypropylene product having high melt flowability.

Description

technical field [0001] The invention relates to a preparation method of high melt fluidity impact polypropylene, which can be directly polymerized under conventional polymerization conditions to obtain polypropylene impact copolymers with specific properties, especially suitable for the production of high melt fluidity impact propylene copolymer. technical background [0002] Impact propylene copolymers are typically used in products where rigidity and impact resistance are required, such as molded or extruded automotive parts, household appliances, luggage and household items. Conventional propylene homopolymers are generally unsuitable for these applications because of their lower impact properties, especially at lower temperatures. The impact propylene copolymer with high melt fluidity (that is, high melt index) has the advantages of good melt fluidity, low energy consumption during processing, and the ability to form complex injection parts at one time, and has attracte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F110/06C08F4/646C08F2/34C08F210/16
Inventor 宋文波张晓萌郭梅芳乔金樑魏文骏张师军胡慧杰
Owner CHINA PETROLEUM & CHEM CORP