A kind of impact-resistant copolymerized polypropylene and preparation method thereof

A technology of impact-resistant copolymerization and polypropylene, applied in the field of polymer material processing, can solve the problems of easy to generate lumps, easy to block the discharge line and conveying valve, and it is difficult to maintain long-term stable operation of impact-resistant copolymerized polypropylene. Achieving the effect of good processing performance

Active Publication Date: 2022-03-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process method has the advantages of fast start-up of polymerization reaction and short reaction time, but it is difficult to obtain high-impact, medium-melt index, low-odor impact copolymerized polypropylene materials
Moreover, this method is easy to generate lumps, and it is very easy to block the discharge line and conveying valve of the reactor, so that the production of impact copolymerized polypropylene is difficult to maintain long-term stable operation

Method used

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  • A kind of impact-resistant copolymerized polypropylene and preparation method thereof

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Embodiment 1

[0044] This embodiment provides a preparation method of impact copolymerized polypropylene, the steps are as follows:

[0045] 1. The first polymerization reaction

[0046] The prepolymerization catalyst, cocatalyst triethylaluminum and modifier n-propyltriethoxysilane are added in the first gas phase reactor, and propylene and hydrogen are passed into the first gas phase reactor to carry out the first polymerization reaction to obtain first reaction product.

[0047] Among them, the molar ratio Al / Mg between the aluminum in the triethylaluminum and the magnesium in the prepolymerized catalyst is 7:1, and the molar ratio Al between the aluminum in the triethylaluminum and the silicon in the modifier silane / Si is 7:1, and the molar ratio of hydrogen to propylene is 9:1;

[0048] The temperature of the first polymerization reaction is 64° C., the absolute pressure is 2.2 MPa, and the powder material level is 70%.

[0049] 2. Separation of the first reaction product

[0050]...

Embodiment 2

[0061] This embodiment provides a preparation method of impact copolymerized polypropylene, the steps are as follows:

[0062] 1. The first polymerization reaction

[0063] The prepolymerization catalyst, cocatalyst triethylaluminum and modifier n-propyltriethoxysilane are added in the first gas phase reactor, and propylene and hydrogen are passed into the first gas phase reactor to carry out the first polymerization reaction to obtain first reaction product.

[0064] Wherein, the molar ratio Al / Mg between the aluminum in the triethylaluminum and the magnesium in the prepolymerized catalyst is 7:1, and the molar ratio Al / Mg between the aluminum in the triethylaluminum and the silicon in the modifier is Si is 7:1, and the molar ratio of hydrogen to propylene is 9:1;

[0065] The temperature of the first polymerization reaction is 64° C., the absolute pressure is 2.2 MPa, and the powder material level is 70%.

[0066] 2. Separation of the first reaction product

[0067] The ...

Embodiment 3

[0078] This embodiment provides a preparation method of impact copolymerized polypropylene, the steps are as follows:

[0079] 1. The first polymerization reaction

[0080] The prepolymerization catalyst, cocatalyst triethylaluminum and modifier n-propyltriethoxysilane are added in the first gas phase reactor, and propylene and hydrogen are passed into the first gas phase reactor to carry out the first polymerization reaction to obtain first reaction product.

[0081] Wherein, the molar ratio Al / Mg between the aluminum in the triethylaluminum and the magnesium in the prepolymerized catalyst is 7:1, and the molar ratio Al / Mg between the aluminum in the triethylaluminum and the silicon in the modifier is Si is 7:1; the molar ratio of hydrogen to propylene is 9:1;

[0082] The temperature of the first polymerization reaction is 64° C., the absolute pressure is 2.2 MPa, and the powder material level is 70%.

[0083] 2. Separation of the first reaction product

[0084] The firs...

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Abstract

The invention provides an impact-resistant copolymerized polypropylene and a preparation method thereof. The preparation method of the impact copolymerized polypropylene comprises: adding the main catalyst, the co-catalyst and the modifying agent into the first gas phase reactor, and feeding propylene and hydrogen into the first gas phase reactor to carry out the first polymerization reaction to obtain The first reaction product; collect the solid phase part of the first reaction product, add it to the second gas phase reactor, feed ethylene, propylene and hydrogen into the second gas phase reactor to carry out the second polymerization reaction, and collect the second reaction product The solid phase part is made into impact copolymerized polypropylene, wherein the activity of the main catalyst is 10000-20000g / g. The above preparation method can ensure the long-term stable production of impact copolymer polypropylene, and make the impact copolymer polypropylene Charpy impact strength ≥ 45kJ / m 2 , The melt index is 14-19g / 10min, and the odor level is ≤3, and the high-impact, medium-melt index, low-odor impact copolymer polypropylene has been prepared.

Description

technical field [0001] The invention relates to polymer material processing technology, in particular to an impact-resistant copolymerized polypropylene and a preparation method thereof, in particular to a high-impact, medium-melting index, low-odor impact-resistant copolymerized polypropylene and a preparation process thereof. Background technique [0002] Polypropylene (PP) is a thermoplastic synthetic resin with excellent performance. It has the advantages of low density, non-toxicity, easy processing, high strength, chemical stability and good electrical insulation. It is the product with the best heat resistance among general resins. . However, due to the relatively high regularity of the molecular structure and the high glass transition temperature, the impact resistance is poor. In order to expand the scope of application of polypropylene, it is usually modified by introducing a second monomer into the basic structure of the polypropylene molecular chain, among which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/06C08F210/02C08F4/646C08F6/02
CPCC08F210/06C08F6/02C08F4/6465C08F210/02C08L23/14C08F2500/04C08F2500/12
Inventor 胡廷芳朱军冉崇文胡斌周豪谌基国冯凯关莉马小伟杨帆田奇超席军杨通赵泽闫维鹏
Owner PETROCHINA CO LTD
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