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Propylene copolymer and preparation method thereof

A propylene copolymer and propylene technology, which is applied in the field of propylene copolymer and its preparation, can solve the problems of not being able to take into account polymerization activity, hydrogen adjustment sensitivity, melt flow index rigidity and impact resistance at the same time, and achieve rigidity and impact resistance. Performance enhancement, effect of high melt flow rate

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of polymerization activity, hydrogenation sensitivity, melt flow index, rigidity and impact resistance in the prior art when preparing high melt flow rate propylene copolymers, and to provide a Propylene copolymer capable of simultaneously taking into account polymerization activity, hydrogenation sensitivity, polymer melt flow index, rigidity and impact resistance and preparation method thereof

Method used

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  • Propylene copolymer and preparation method thereof
  • Propylene copolymer and preparation method thereof
  • Propylene copolymer and preparation method thereof

Examples

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preparation example Construction

[0016] The present invention provides a kind of preparation method of propylene copolymer, and this method comprises the following steps:

[0017] (1) In the presence of a Ziegler-Natta catalyst, prepolymerize propylene at -10°C to 50°C and 0.1-10MPa for 4-20 minutes to obtain a propylene prepolymer;

[0018] (2) In the presence of the propylene prepolymer obtained in step (1), conduct gas-phase polymerization of propylene at 91-130°C and 1-5 MPa for 40-120 minutes to obtain a propylene homopolymer;

[0019] (3) In the presence of the propylene homopolymer obtained in step (2), gas-phase polymerize propylene and α-olefin at 50-150°C and 1-5MPa for 20-120 minutes to obtain a propylene copolymer, wherein the α-Olefin is the number of carbon atoms is C 2 -C 6 but not for C 3 at least one of .

[0020] In the present invention, "prepolymerization ratio" refers to the ratio of the weight of the prepolymer to the weight of the original catalyst added. Usually for batch prepolym...

preparation example 1

[0082] This preparation example is used to prepare the catalyst solid component used in the preparation method of the propylene copolymer of the present invention.

[0083] After fully replacing the 16L pressure-resistant reactor with agitator with nitrogen, add 10L ethanol, 300mL 2-ethylhexanol, 11.2g iodine, 8g magnesium chloride and 640g magnesium powder into the reactor. While stirring, the system was refluxed until no more hydrogen was released. Stop the reaction, wash with 3L ethanol, filter and dry. The resulting dialkoxymagnesium support. The resulting dialkoxymagnesium carrier has a D50 of 30.2 μm, a span value of 0.81, and an m value of 0.015.

[0084] Take 650g of the above alkoxymagnesium compound, 3250mL of toluene and 65mL of diethyl phthalate (DEP) to prepare a suspension. In a 16L pressure-resistant reactor that has been repeatedly replaced by high-purity nitrogen, add 2600 mL of toluene and 3900 mL of titanium tetrachloride, raise the temperature to 80 ° C,...

Embodiment 1

[0086] This example is used to illustrate the propylene copolymer provided by the present invention and its preparation method.

[0087] The experiment adopts continuous tank type prepolymerization and horizontal tank gas phase series polymerization process. The volume of the pre-polymerization reactor is 5 liters, it is a vertical stirring tank with jacket cooling, the stirring blade is a turbine-type oblique paddle, and the stirring speed is 500 rpm; the volume of the horizontal gas phase reactor is 0.2 cubic meters, it is a horizontal Stirring, the stirring blade is a T-shaped inclined blade, the inclination angle is 10 degrees, and the stirring speed is 100 rpm, wherein the gas phase homopolymerization of propylene in step (2) and the copolymerization of gas phase propylene and ethylene in step (3) are homogeneous Carried out in a horizontal gas phase reactor.

[0088] Step (1) pre-polymerization: the reaction pressure is 2.5MPa, the reaction temperature is 10°C, and the ...

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Abstract

The invention provides a propylene copolymer and a preparation method thereof. The preparation method comprises the following steps that 1, in the presence of a Ziegler-Natta catalyst, propylene undergoes a prepolymerization reaction at a temperature of -10 to 50 DEG C under the pressure of 0.1-10MPa for 4-20min to produce a propylene prepolymer; 2, in the presence of the propylene prepolymer obtained by the step 1, propylene undergoes a propylene gaseous polymerization reaction at a temperature of 91 to 130 DEG C under the pressure of 1-5MPa for 40-120min to produce a propylene homopolymer; and 3, in the presence of the propylene homopolymer obtained by the step 2, propylene and alpha-olefin undergo a gaseous polymerization reaction at a temperature of 50 to 150 DEG C under the pressure of 1-5MPa for 20-120min to produce a propylene copolymer and the alpha-olefin has carbon number of 2-6 but 3. The propylene copolymer has a high melt flow index, rigidity and impact resistance.

Description

technical field [0001] The invention relates to a propylene copolymer and a preparation method thereof. Background technique [0002] Most propylene copolymer products can be used as injection molding products, and are widely used in the fields of packaging, transportation, home appliances, automobiles, offices, daily consumer goods and medical products. There are two trends in the development of high-performance propylene copolymer products. The first trend is to increase the melt flow rate (MFR, also known as fluid flow index (MFI)) of the polymer, which is beneficial to shorten the molding cycle, reduce energy consumption, and make large thin-walled products. In the past, injection molding products with MFR of 10-15g / 10min are being replaced by products with MFR of 25-35g / 10min. The second trend is to seek a balance between the rigidity and impact strength of propylene copolymers. While meeting the impact resistance requirements of propylene copolymers, the rigidity can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F2/34C08F2/02C08F210/16C08F4/02
Inventor 于鲁强杨芝超陈江波杜亚锋仝钦宇刘旸邹杰王路生代增悦谭忠
Owner CHINA PETROLEUM & CHEM CORP
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