Impact resistant copolymerized polypropylene and preparation method thereof

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

Active Publication Date: 2019-12-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Impact resistant copolymerized polypropylene and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a method for preparing impact copolymer polypropylene, and the steps are as follows:

[0045] 1. The first polymerization reaction

[0046] The prepolymerization catalyst, the co-catalyst triethylaluminum and the modifier n-propyltriethoxysilane are added to the first gas phase reactor, and propylene and hydrogen are fed into the first gas phase reactor to perform the first polymerization reaction. The first reaction product.

[0047] Among them, the molar ratio of aluminum in triethylaluminum to magnesium in the prepolymerization catalyst Al / Mg is 7:1, and the molar ratio of aluminum in triethylaluminum to silicon in the modifier silane is Al / Mg. / 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 level is 70%.

[0049] 2. Separate the first reaction product

[0050] The first reaction product in the first gas phase reacto...

Embodiment 2

[0061] This embodiment provides a method for preparing impact copolymer polypropylene, and the steps are as follows:

[0062] 1. The first polymerization reaction

[0063] The prepolymerization catalyst, the co-catalyst triethylaluminum and the modifier n-propyltriethoxysilane are added to the first gas phase reactor, and propylene and hydrogen are fed into the first gas phase reactor to perform the first polymerization reaction. The first reaction product.

[0064] Among them, the molar ratio of aluminum in triethylaluminum to magnesium in the prepolymerization catalyst Al / Mg is 7:1, and the molar ratio of aluminum in triethylaluminum to silicon in the modifier is Al / Mg. 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 level is 70%.

[0066] 2. Separate the first reaction product

[0067] The first reaction product in the first gas phase reactor is fed...

Embodiment 3

[0078] This embodiment provides a method for preparing impact copolymer polypropylene, and the steps are as follows:

[0079] 1. The first polymerization reaction

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

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

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

[0083] 2. Separate the first reaction product

[0084] The first reaction product in the first gas phase reacto...

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Abstract

The invention provides impact resistant copolymerized polypropylene and a preparation method thereof. The preparation method of the impact resistant copolymerized polypropylene includes the steps: adding a main catalyst, a cocatalyst and a modifier into a first gas-phase reactor, introducing propylene and hydrogen into the first gas-phase reactor, and carrying out a first polymerization reaction to obtain a first reaction product; collecting a solid part of the first reaction product, adding the solid part of the first reaction product into a second gas-phase reactor, and introducing ethylene,propylene and hydrogen into the second gas-phase reactor, carrying out a second polymerization reaction, and collecting a solid part of the second reaction product, to prepare the impact resistant copolymerized polypropylene. The activity of the main catalyst is 10000-20000 g/g. The preparation method can ensure the long-term stable production of the impact resistant copolymerized polypropylene,the impact strength of a simply supported beam of the impact resistant copolymerized polypropylene is more than or equal to 45 kJ/m<2>, the melt index is 14-19 g/10 min, and the odor grade is less than or equal to 3. The impact resistant copolymerized polypropylene with high impact resistance, middle melt index and low odor is prepared.

Description

Technical field [0001] The invention relates to a polymer material processing technology, in particular to an impact copolymer polypropylene and a preparation method thereof, in particular to a high impact medium melt finger low odor impact copolymer 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 high glass transition temperature, the impact resistance is poor. In order to expand the application range of polypropylene, it is usually modified by introducing a second monomer into the basic structure of polypropylene molecular chain. Ethylene is the most commonly used second monomer. Compar...

Claims

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Application Information

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Patent Type & Authority Applications(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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