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A grafting process after solution polymerization

A solution and process technology, which is applied in the field of grafting process after solution polymerization, can solve the problems of difficult solvent recovery, limited wide application, and long reaction time, and achieves the effects of low price, improved grafting efficiency, and simple operation

Active Publication Date: 2021-07-27
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solution method is to dissolve polyolefin and each reaction component in toluene, xylene or o-dichlorobenzene solvent to form a homogeneous system, and initiate grafting reaction under this condition; the solution method has the advantages of simple operation and low reaction temperature. , uniform modification, low degree of degradation, less side reactions, high grafting efficiency, etc. The disadvantages are that the long reaction time, difficult solvent recovery, and environmental pollution limit the wide application of this method in industry; but for difficult synthetic In the research stage of laboratory functional modification of new polyolefin varieties, it still has certain application value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] For ethylene-butene polymerization, cyclohexane is used as solvent, and the specific post-treatment process is as follows:

[0025] The ethylene-butene copolymer solution from the polymerization tank first enters the reaction termination unit, where a small amount of soft water is added at the same time to terminate the reaction and deactivate the residual catalyst. The polymer solution coming out of the reaction termination unit goes through the deashing unit to remove catalyst residues and acidic substances, and then enters the grafting unit, where the deashing unit is a column filled with activated alumina or molecular sieve. The grafting unit consists of a stirred reactor, a polymer solution tank and a 30-meter pipe reactor. The polymer solution enters the stirred reactor and the polymer solution tank respectively in two ways, wherein the polymer solution tank is fed continuously, while the stirred reactor is fed intermittently. Add dicumyl peroxide and maleic anhy...

Embodiment 2

[0027] Ethylene-propylene polymerization reaction, using hexane as solvent, the specific post-grafting process is:

[0028] The ethylene-propylene copolymer solution coming out of the polymerization tank first enters the reaction termination unit, where a small amount of steam is added at the same time to terminate the reaction and deactivate the residual catalyst. The polymer solution coming out of the reaction terminating unit enters the grafting unit. The grafting unit consists of a stirred reaction tank and two polymer solution tanks. The polymer solution enters the stirred reactor and the 1# polymer solution tank respectively in two ways, wherein the polymer solution tank is fed continuously, while the stirred reactor is fed intermittently. The 2# polymer solution tank has always maintained a certain amount of polymer solution, and the storage capacity is equivalent to the feed amount of the stirred reactor. Add dicumyl peroxide and acrylic acid under the condition that...

Embodiment 3

[0030] Ethylene polymerization (branched or hyperbranched polyethylene) reaction, using hexane as a solvent, the specific post-treatment process is:

[0031]The branched or hyperbranched polyethylene solution from the polymerization tank first enters the reaction termination unit, where a small amount of soft water is added at the same time to terminate the reaction and deactivate the residual catalyst. The polymer solution coming out of the reaction termination unit goes through the deashing unit to remove catalyst residues and acidic substances, and then enters the grafting unit, where the deashing unit is a column filled with activated alumina or molecular sieve. The grafting unit consists of a stirring reaction tank and a polymer solution tank. The polymer solution enters the stirred reactor and the polymer solution tank respectively in two ways, wherein the polymer solution tank is fed continuously, while the stirred reactor is fed intermittently. Add dibenzoyl peroxide ...

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PUM

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Abstract

The invention discloses a grafting process after solution polymerization, which belongs to the technical field of macromolecules. The invention effectively combines the solution polymerization process and the grafting process, and the polymer solution coming from the polymerization unit can be used for the grafting reaction in the solution state without removing the solvent or completely removing the solvent. Moreover, the boiling point of the solvent in the present invention is low, and the removal is relatively easy; compared with the prior art, the present invention can obtain a product with a high grafting rate at a lower cost.

Description

technical field [0001] The invention specifically relates to a grafting process after solution polymerization, which belongs to the technical field of macromolecules. Background technique [0002] As a bulk variety of general-purpose plastics, polyolefins are widely used in daily life, packaging industry, automobile, construction, agriculture, medical It is widely used in health, scientific research and military fields. However, since polyolefins are mainly composed of C and H atoms, which are non-polar polymers, the non-polarity and semi-crystalline nature of macromolecular chains make polyolefin resins have very low surface energy, resulting in their When blending or compounding with other polymers and inorganic materials, it is difficult to achieve effective bonding and compatibility at the interface, which makes it difficult to guarantee the performance of the blend or composite material; moreover, the non-polarity itself also limits the polyolefin resin in dyeing , pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F255/04C08F222/06C08F2/06
CPCC08F2/06C08F255/02C08F255/04C08F222/06
Inventor 郭峰汪文睿李传峰任鸿平汪开秀杨爱武
Owner SINOPEC YANGZI PETROCHEM