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Method for preparing polypropylene grafted copolymer

A polypropylene grafting and copolymer technology, which is applied in the field of graft copolymer preparation, can solve the problems of propylene coordination comonomer restriction, polar vinyl monomers are difficult to polymerize, etc., to improve the grafting effect , Simplify the preparation process and reduce the cost

Active Publication Date: 2008-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Ziegler-Natta catalyst used in the propylene polymerization process contains Lewis acid, so that the selection of propylene coordination comonomers is strictly limited, and it is difficult for polar vinyl monomers to carry out polymerization reactions under the above catalytic conditions.

Method used

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  • Method for preparing polypropylene grafted copolymer

Examples

Experimental program
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Effect test

example 1

[0039] Prepare spherical carrier and polypropylene catalyst according to the method of CN1109067A.

[0040] (1) Preparation of carrier

[0041] Add 34g of anhydrous magnesium chloride, 80ml of absolute ethanol, 100ml of methyl silicone oil (chemically pure, with a viscosity of 300 centipoise), and 100ml of liquid paraffin (chemically pure, with a viscosity of 300 centipoise) to a stirrer equipped with nitrogen protection. In a 500ml reaction bottle with a condenser tube, heat to 120°C, react until the magnesium chloride is completely dissolved, transfer this solution to a mixed solution of 150ml each of methyl silicone oil and liquid paraffin, and stir at a speed of 2000 to 3000 rpm for 4 minutes, put it into anhydrous hexane pre-cooled to -30°C, stir until the system temperature rises to room temperature, filter, and wash the obtained solid three times with 200ml anhydrous hexane, and vacuum-dry to obtain a spherical carrier.

[0042] (2) Preparation of catalyst

[0043] Un...

example 2

[0045] The polypropylene graft copolymers described in the present invention are prepared.

[0046] (1) Propylene prepolymerization

[0047] Add 100ml hexane, 1.0g cocatalyst Al (C 2 h 5 ) 3 , 0.085g external electron donor - methylcyclohexyldimethoxysilane [CH 3 C 6 h 11 Si(OCH 3 ) 2 ] and 0.08g solid catalyst A, the molar ratio of aluminum / titanium is 300, and the molar ratio of external electron donor and titanium is 15. Propylene gas is passed into the reaction bottle at 20°C, and pre-polymerization is carried out under a pressure of 0.1MPa for 10 minutes. The mass ratio of the produced polypropylene to the catalyst A was 50.0. Most of the unreacted propylene in the solvent was removed under reduced pressure to obtain a propylene prepolymerized suspension.

[0048] (2) Propylene polymerization

[0049] Add 800ml of hexane into a 2L pressure-resistant stainless steel reactor with stirring, transfer the pre-polymerized suspension to the reactor, fill the reactor wi...

example 3

[0053] (1) Carry out propylene prepolymerization and polymerization in the same tank.

[0054] In a 2L pressure-resistant stainless steel reactor with stirring, add 800ml hexane, 1.0g promoter Al(C 2 h 5 ) 3 , 0.085g external electron donor [CH 3 C 6 h 11 Si(OCH 3 ) 2 ] and 0.08g of solid catalyst A, pre-polymerized for 10 minutes at 20°C under a propylene gas pressure of 0.1MPa, and the mass ratio of the resulting polypropylene to catalyst A was 50.0. Rapidly raise the temperature to 70° C., feed hydrogen and propylene to make the hydrogen pressure 0.1 MPa and the total pressure 0.9 MPa, and stir for 2 hours. The solvent and propylene in the reactor were removed under reduced pressure to obtain 808g polypropylene. The activity of the polymerization catalyst and the average diameter and porosity of the obtained polypropylene are shown in Table 1.

[0055] (2) Graft copolymerization

[0056] Get the undried polypropylene that (1) step makes, carry out polypropylene gra...

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Abstract

A preparation method for PP graft copolymer comprises the steps that: (1) the propylene is driven to contact with a solid catalyst, aluminum alkyl and the external electron donor compounds to be prepolymerized so as to obtain the propylene prepolymerization suspension under the circumstance of the existence of the inert solvents; (2) the propylene is added into the propylene prepolymerization suspension to carry out a propylene polymerization so as to obtain the new ecological polypropylene particles; (3) the new ecological polypropylene particles are moved into another reactor under the protection of the inert gas and then peroxide initiators, vinyl monomers and acromatics are added in so as to carry out a copolymerization at a temperature ranging from 60 to 150 DEG C and then the reactants are dried. In the method, the new ecological polypropylene is used as a raw material for grafting reaction so as to effectively enhance the grafting effect of the polypropylene.

Description

technical field [0001] The invention relates to a preparation method of a graft copolymer, in particular to a preparation method of a polypropylene graft copolymer. Background technique [0002] Graft modification is an important method of modifying polypropylene, including solution grafting, melt grafting, solid phase grafting, suspension grafting and other methods. Solution grafting uses a large amount of organic solvents, but a suitable flocculant is required to precipitate the grafted products during post-treatment. The production cost is high and often causes environmental pollution, and its use will be more and more restricted. Melt grafting is a common chemical grafting method for polypropylene due to its simple operation. However, due to the high grafting temperature, the degradation of polypropylene macromolecules is serious. The research on the aqueous phase suspension grafting method is still not perfect, and it is still in the laboratory stage. In comparison, t...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F110/06C08F4/645
Inventor 费建奇赵伟忻海
Owner CHINA PETROLEUM & CHEM CORP
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