Preparation method of propylene polymer

A propylene polymer and propylene technology, applied in the field of propylene polymer preparation, can solve the problems of complex polymerization process, high temperature polymerization activity need to be further improved, etc.

Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst also realizes the high-temperature polymerization of propylene by introducing a mixture of aluminoxane and alkylaluminum as a cocatalyst in the polymerization process. This invention needs to introduce new components in the catalyst preparation process, re

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  • Preparation method of propylene polymer
  • Preparation method of propylene polymer
  • Preparation method of propylene polymer

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preparation example Construction

[0025] The invention provides a method for preparing a propylene polymer. The method comprises: in the presence of a catalyst, polymerizing propylene or a mixture of propylene and ethylene and / or α-olefin in a reactor at a temperature of 80 to 150°C to obtain propylene Polymer, the catalyst contains a catalyst component, an alkylaluminum compound and an external electron donor compound, the catalyst component is prepared by a method comprising the following steps:

[0026] (1) carrying out the first contact reaction with magnesium halide and alcohol compound in the presence of hydrocarbon solvent to form a homogeneous solution;

[0027] (2) In the presence of a precipitation aid, the homogeneous solution obtained in step (1) is subjected to a second contact reaction with a titanium compound to precipitate a solid precipitate to obtain a mixture containing a solid precipitate;

[0028] (3) carrying out the third contact reaction with the mixture obtained in step (2) and the int...

preparation example 1

[0091] This preparation example is used to prepare the catalyst component used in the preparation method of the propylene polymer of the present invention.

[0092] In the reaction kettle that has been repeatedly replaced by high-purity nitrogen, 52.5mmol (5.0g) of anhydrous magnesium chloride, 328mmol (35ml) of toluene, and 140mmol (22ml) of 2-ethylhexanol were added in sequence, at a stirring speed of 450rpm and a temperature of 110°C Under the conditions of 3.0 hours, a stable and uniform alcoholate solution was obtained; 0.8mmol (0.4ml) of 3,5-heptanediol dibenzoate was added, and 2-isopropyl-2-(3-methyl butyl)-1,3-dimethoxypropane 0.6mmol (0.3ml), diisobutyl phthalate 5.6mmol (1.5ml), tetrabutyl titanate 2.2mmol (0.75ml), stirred for 60 minutes, cool to room temperature.

[0093] Add 0.8mmol (0.4ml) of 3,5-heptanediol dibenzoate to the above, 0.6mmol of 2-isopropyl-2-(3-methylbutyl)-1,3-dimethoxypropane (0.3ml), diisobutyl phthalate 5.6mmol (1.5ml), tetrabutyl titanate ...

preparation example 2

[0106] Add 0.8mmol (0.4ml) of 3,5-heptanediol dibenzoate to Preparation 1, 2-isopropyl-2-(3-methylbutyl)-1,3-dimethoxy Propane 0.6mmol (0.3ml), diisobutyl phthalate 5.6mmol (1.5ml), tetrabutyl titanate 2.2mmol (0.75ml), add 4-ethyl-3,5-heptanediol instead Dibenzoate 2.6mmol, 2-isopropyl-2-(3-methylbutyl)-1,3-dimethoxypropane 6mmol (3ml), di-n-butyl phthalate 10.5mmol, Isopropyl titanate 4.4mmol, the rest are the same as in Example 1. The results of the titanium content of the catalyst component, the content of the precipitation aid a and the particle size distribution of the catalyst component are shown in Table 1.

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Abstract

The invention relates to a preparation method of propylene polymer. The method comprises preparing the propylene polymer in the presence of a catalyst under a temperature of 80 to 150 DEG C, wherein the catalyst comprises a catalyst component, an aluminum alkyl compound and an external electron donor compound. The catalyst component is prepared by the following steps: (1) preparing an homogeneous solution; (2) contacting the solution obtained in the step (1) with a titanium compound and reacting in the presence of a precipitation aid agent to obtain a mixture; and (3) contacting the mixture in the step (2) with an internal electron donor, wherein the precipitation aid agent comprises a precipitation aid agent a which is a diol ester compound as shown in a formula (I), a precipitation aid agent b which is alkyl ester of aliphatic or aromatic carboxylic acid, a precipitation aid agent c which is a titanate compound, and a precipitation aid agent c which is 1,3-diether compound as shown in a formula (II), and a is different from b. The propylene polymer prepared by the invention has both high melt index and isotactic index.

Description

technical field [0001] The present invention relates to a preparation method of propylene polymer. Background technique [0002] When the magnesium chloride-supported titanium tetrachloride Ziegler-Natta polypropylene catalyst is used for propylene homopolymerization or copolymerization, as the reaction temperature increases, the polymerization activity gradually increases; when the polymerization temperature reaches about 80 ° C, the polymerization activity reaches the maximum value; If the polymerization temperature continues to increase, the activity of the catalyst will rapidly decay. When the polymerization temperature exceeds 100°C, the polymerization activity usually drops very low, and the industrial application value is lost. [0003] Although the activity of Ziegler-Natta polypropylene catalyst is reduced at high temperature, it has many advantages. First of all, since the polymerization of propylene will release a lot of heat, in industry, people have always hope...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/649C08F4/645C08F4/651C08F4/654
Inventor 严立安谭忠徐秀东周奇龙宋维玮尹珊珊于金华李凤奎
Owner CHINA PETROLEUM & CHEM CORP
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