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Propylene polymer and preparation method thereof

A propylene polymer and propylene technology, applied in the field of propylene polymer and its preparation, can solve the problem that it is difficult to obtain a propylene polymer with a high melt mass flow index, the sensitivity to hydrogen adjustment needs to be further improved, and it is difficult to adjust the sensitivity to hydrogen. problems, such as high melt mass flow rate, high specification, and easy operation.

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although during the polymerization of olefins (especially propylene), the use of external electron donor compounds disclosed in US5652303, US5844046, US6111039 and US6087459 can improve the melt mass flow rate of the polymer finally obtained to a certain extent, but the above-mentioned olefins The hydrogen tuning sensitivity of the polymerization catalyst system still needs to be further improved
Moreover, it is still difficult to achieve a balance between good hydrogen modulation sensitivity and high catalytic activity in the olefin polymerization catalyst system using the above two silane compounds as external electron donor compounds.
In addition, when using the external electron donor compounds disclosed in US5652303, US5844046, US6111039 and US6087459 to prepare propylene polymers by gas phase polymerization, it is difficult to obtain propylene polymers with high melt mass flow index

Method used

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  • Propylene polymer and preparation method thereof
  • Propylene polymer and preparation method thereof
  • Propylene polymer and preparation method thereof

Examples

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preparation example Construction

[0019] The invention provides a method for preparing a propylene polymer, the method comprising: first contacting a first part of propylene with a first part of hydrogen under the conditions of the first olefin gas phase polymerization, and removing Unreacted monomer and hydrogen to give the first contact product.

[0020] According to the method of the present invention, said first contacting is carried out in the presence of an olefin polymerization catalyst system. In the present invention, "the first contact is carried out in the presence of the olefin polymerization catalyst system" means that the first part of propylene and the first part of hydrogen are contacted with the mixture of the components in the olefin polymerization catalyst system, so that Propylene is polymerized.

[0021] In the actual operation process, the first contact can be realized in the presence of the olefin polymerization catalyst system in the following manner: the olefin polymerization catalyst...

preparation example 1

[0081] (1) Preparation of magnesium chloride alcoholate

[0082] The three-neck flask equipped with a stirrer and a thermometer was replaced with nitrogen three times, and then 5 g of anhydrous magnesium chloride, 30 mL of n-decane and 23 mL of ethanol were added. The temperature was raised to 130°C while stirring, and the reaction was carried out at this temperature for 2 hours. 1.5 mL of tetrabutyl titanate and 2 mL of diisobutyl phthalate were added to 5 mL of toluene in advance, and the reaction was stirred at room temperature for 0.5 hours. Add the above-mentioned toluene solution into the above-mentioned three-neck flask, and continue to react at 130° C. for 1 hour, and cool to room temperature after the reaction to form a stable and uniform magnesium chloride alcoholate solution.

[0083] (2) Preparation of catalyst solid components

[0084] The three-necked flask equipped with a stirrer and a thermometer was replaced with nitrogen three times, then 200 mL of titanium ...

preparation example 2

[0086] (1) Preparation of magnesium chloride alcoholate

[0087] Adopt the same method as step (1) in the preparation example 1 to prepare magnesium chloride alcoholate, the difference is, use di-n-butyl phthalate instead of diisobutyl phthalate, thereby prepare magnesium chloride alcoholate solution .

[0088] (2) Preparation of catalyst solid components

[0089] The solid component of the catalyst is prepared in the same manner as step (2) in Preparation Example 1, except that di-n-butyl phthalate is used instead of diisobutyl phthalate to obtain the solid component of the catalyst point. The content of Ti in this solid component was 2.12 wt%.

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Abstract

The invention provides a propylene polymer and a preparation method thereof. The method provided by the invention comprises the following steps: under first olefin gas-phase polymerization conditions, performing first contact reaction on a first part of propylene and a first part of hydrogen gas, and removing unreacted monomers and hydrogen gas from the mixture obtained through the first contact reaction, thus obtaining a first contact reaction product; and under second olefin gas-phase polymerization conditions, performing second contact reaction on the first contact reaction product, a second part of propylene, a second part of hydrogen gas and a comonomer, thus obtaining the propylene polymer, wherein an olefinic polymerization catalyst system contains an external electron donor compound, the external electron donor compound contains a first external electron donor compound selected from tetraethoxy silane and n-propyl trimethoxy silane and a second external electron donor compound selected from diisopropyl dimethoxy silane and diisobutyl dimethoxy silane. The method provided by the invention has favorable hydrogen regulation sensitivity and high polymerization efficiency.

Description

technical field [0001] The invention relates to a propylene polymer and a preparation method thereof. Background technique [0002] Polypropylene is cheap to produce, has good rigidity, and has a wide range of uses. However, propylene homopolymer has the disadvantages of poor toughness or impact resistance, which requires toughening modification. A commonly used method to improve the toughness or impact resistance of propylene homopolymer is to copolymerize propylene with ethylene and / or α-olefin to introduce a rubber phase into the propylene homopolymer, so that the obtained propylene polymer Has good toughness or impact resistance. [0003] While obtaining a propylene polymer with high toughness or impact resistance, it is also desirable that the propylene polymer has good processability. The main means to improve the processability of propylene polymers is to increase their melt fluidity, ie to increase the melt mass flow rate (MFR) of propylene polymers. High fluidit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F210/16C08F2/34C08F4/646
Inventor 赵唤群袁春海田正昕李化毅胡友良李倩赵丽梅王小涓郭锐张文媛
Owner CHINA PETROLEUM & CHEM CORP
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