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Application of a kind of organosilane and polypropylene and preparation method thereof

A technology of organosilane and polypropylene, which is applied in the field of polypropylene and polypropylene preparation, and can solve the problems of low melt strength of polypropylene, a large amount of gel, and poor processability of products

Active Publication Date: 2020-01-10
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects that the melt strength of the polypropylene prepared by the existing method is low and the degree of branching is too high to produce a large amount of gel, resulting in poor processability of the product, and to provide an organosilane in Application in preparing polypropylene, a preparation method of polypropylene and polypropylene prepared by the method

Method used

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  • Application of a kind of organosilane and polypropylene and preparation method thereof

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Experimental program
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preparation example Construction

[0018] The main improvement of the method for preparing polypropylene provided by the present invention is that the general formula R is added to the polymerization reaction system before the propylene polymerization reaction and / or during the olefin polymerization reaction. 1 SiX m R 2 n The type of catalyst and the method and conditions of propylene polymerization can be selected conventionally in the field.

[0019] For example, the catalyst may be various existing substances that can be used to catalyze the polymerization of propylene monomers, and specific examples thereof include, but are not limited to: at least one of Ziegler-Natta catalysts, metallocene catalysts, and non-metallocene catalysts. Kind.

[0020] According to the present invention, the catalyst is preferably a Ziegler-Natta catalyst, and the Ziegler-Natta catalyst is preferably MgCl 2 Supported catalytic system, the MgCl 2 Supported catalytic system contains MgCl 2 , TiCl 4 , Aluminum alkyl and / or aluminum alko...

Embodiment 1

[0035] Under vacuum, add 500g of liquid propylene into the reactor, and then add 0.1g of hydrogen, 0.54mol of triethylaluminum, 0.05mg of 4-pentenyltrichlorosilane and 10mg of composite catalyst in sequence. The reaction temperature is controlled at 70 ℃, the polymerization reaction time is 60 minutes, after the completion of the polymerization, the gas in the reactor is vented, discharged, and vacuum dried at 50°C to obtain 325 g of homopolymer polypropylene.

[0036] The melt strength, melt index and gel content of the homopolypropylene prepared above were tested, and the test results are shown in Table 1.

Embodiment 2

[0038] Under vacuum, add 500g of liquid propylene into the reactor, and then add 0.1g of hydrogen, 0.54mol of triethylaluminum, 0.05mg of 5-hexenyltrichlorosilane and 10mg of composite catalyst in sequence. The reaction temperature is controlled at 70 ℃, the polymerization reaction time is 60 minutes, after the completion of the polymerization, the gas in the reactor is vented, discharged, and vacuum dried at 50 ℃ to obtain 330 g of homopolymer polypropylene.

[0039] The melt strength, melt index and gel content of the homopolypropylene prepared above were tested, and the test results are shown in Table 1.

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Abstract

The invention relates to the technical field of modification of polyolefin resin, and discloses an application of an organosilane in preparation of polypropylene, a preparation method of the polypropylene and the polypropylene prepared by the method. The preparation method of the polypropylene comprises the step of performing a propylene polymerization reaction on a propylene monomer in the presence of a catalyst, the method further comprises the step of adding the organosilane into the polymerization system before the propylene polymerization reaction is performed and / or in the propylene polymerization reaction process, and the organosilane has a structural formula of R<1>SiXmR<2>n, wherein R<1> is a C5-C20 1-alkylene, X is a halogen, and R<2> is C1-C20 linear, branched or isomerized alkyl, m is an integer of 1 to 3, n is an integer of 0 to 2, and m + n = 3. The polypropylene prepared by the method provided by the invention has higher melt strength and a lower content of gel, and evendoes not contain the gel; and the prepared polypropylene does not need post-treatment, and the residual organosilane facilitates further improving the melt strength of the polypropylene.

Description

Technical field [0001] The invention relates to a modification technology of polyolefin resin, in particular to the application of an organosilane in the preparation of polypropylene, a preparation method of polypropylene and the polypropylene prepared by the method. Background technique [0002] As a thermoplastic polymer material with excellent performance, polypropylene has the characteristics of low density, non-toxicity, easy processing and molding, and excellent comprehensive performance. It is widely used in automobiles, household appliances, food packaging, building materials and other fields. The fastest growing variety in general plastics. Although polypropylene has many advantages, most of the current common commercial polypropylene has a linear structure, while linear polypropylene does not have strain hardening in the molten state, and its melt strength is low, which directly causes some defects in the melt processing of polypropylene. Including curling and shrinkin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F210/06C08F230/08C08F2/00
CPCC08F2/00C08F110/06C08F210/06C08F230/08
Inventor 董金勇王成秦亚伟
Owner INST OF CHEM CHINESE ACAD OF SCI