Preparation method of maleic anhydride grafted polypropylene

A technology of grafting polypropylene and maleic anhydride, which is applied in the field of preparation of maleic anhydride grafted polypropylene, can solve the problem of difficult to obtain high maleic anhydride grafting rate and mechanical properties of maleic anhydride grafted polypropylene and polypropylene Grafting rate decline and other issues, to achieve stable free radical concentration, free radical coupling termination rate decreased, and inhibit degradation effect

Active Publication Date: 2015-07-29
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Maleic anhydride free radicals are melt-grafted onto polypropylene substrates. The main technical problem is that it is difficult to obtain maleic anhydride grafts with high maleic anhydride grafting rate and good mechanical properties due to the simultaneous existence of grafting and degradation of polypropylene. Polypropylene
Another way to reduce the degradation of polypropylene is to reduce the amount of initiator, thereby reducing the number of initiator free radicals and macromolecular free radicals, but it will also lead to a decrease in the grafting rate of polypropylene

Method used

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  • Preparation method of maleic anhydride grafted polypropylene
  • Preparation method of maleic anhydride grafted polypropylene
  • Preparation method of maleic anhydride grafted polypropylene

Examples

Experimental program
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Embodiment 1

[0034] 7.5Kg styrene and 0.4Kg initiator dicumyl peroxide (product of Shanghai Gaoqiao Petrochemical) were mixed and dissolved. Mix 100Kg of polypropylene (product of Shanghai Petrochemical Co., Ltd., brand: Y1600, melt index: 16g / min) and 5.0Kg of maleic anhydride in a high mixer. Then, the mixture of polypropylene and maleic anhydride is fed into a twin-screw extruder with a screw diameter of 57mm, a length-to-diameter ratio of 60:1, and a total of 15 screw barrel sections at a speed of 1.2Kg / min. The initiator / styrene solution is input through the metering pump through two feeding ports. The first feeding port is in the 4th screw barrel section, the second feeding port is in the 7th screw barrel section, and the speed of each feeding port is 45g / min respectively. The barrel temperature was set at 180° C., and the rotation speed of the extruder was 90 rpm. In the 13th barrel section, the liquid antioxidant 2,6-di-tert-butyl-4-n-butylphenol is input at a speed of 5 g / min. ...

Embodiment 2

[0044] 7.5Kg styrene and 0.4Kg initiator dicumyl peroxide (product of Shanghai Gaoqiao Petrochemical) were mixed and dissolved. Mix 100Kg of polypropylene (product of Shanghai Petrochemical Co., Ltd., brand: Y1600, melt index: 16g / min) and 5.0Kg of maleic anhydride in a high mixer. Then, the mixture of polypropylene and maleic anhydride was fed into a two-stage twin-screw extruder at a rate of 1.2 Kg / min. The screw diameter of the first-stage twin-screw extruder is 57mm, the aspect ratio is 60:1, and a total of 15 screw barrel segments; the screw diameter of the second-stage twin-screw extruder is 65mm, the aspect ratio is 28:1, a total of 7 screw barrel segment. The initiator / styrene solution is input through the metering pump through three feeding ports. The first feeding port is in the 4th screw barrel section of the first-stage twin-screw extruder, the second feeding port is in the 8th screw barrel section of the first-stage twin-screw extruder, and the third feeding por...

Embodiment 3

[0054] 3.0Kg styrene and 0.4Kg initiator dicumyl peroxide (product of Shanghai Gaoqiao Petrochemical) were mixed and dissolved. Mix 100Kg of polypropylene (product of Shanghai Petrochemical Co., Ltd., brand: Y1600, melt index: 16g / min) and 5.0Kg of maleic anhydride in a high mixer. Then, the mixture of polypropylene and maleic anhydride is fed into a twin-screw extruder with a screw diameter of 57mm, a length-to-diameter ratio of 60:1, and a total of 15 screw barrel sections at a speed of 1.2Kg / min. The initiator / styrene solution is input through the metering pump through two feeding ports. The first feeding port is in the 4th screw barrel section, the second feeding port is in the 7th screw barrel section, and the speed of each feeding port is 19.5g / min respectively. The barrel temperature was set at 180° C., and the rotation speed of the extruder was 90 rpm. In the 13th barrel section, the liquid antioxidant 2,6-di-tert-butyl-4-n-butylphenol is input at a speed of 5 g / min....

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Abstract

The invention provides a preparation method of maleic anhydride grafted polypropylene. According to the method, maleic anhydride is grafted to a polypropylene molecular chain through melting free radical grafting reaction. In the melting grafting reaction initiated by a peroxide initiator, the initiator and auxiliary monomer styrene are prepared into a solution, and the solution is continuously metered and input to a plurality of positions of different screw barrel sections of a double-screw extruder. The adopted extruder is the double-screw extruder of which the draw ratio is greater than or equal to 48: 1 or a double-order double-screw extruder. The usage of the maleic anhydride in raw materials is 1.0-10.0 weight percent of that of polypropylene. According to the preparation method, the functional maleic anhydride grafted polypropylene which is high in grafting rate can be obtained, and the molecular weight of the functional maleic anhydride grafted polypropylene is not obviously reduced compared with the molecular weight of the polypropylene in the raw materials.

Description

technical field [0001] The invention relates to a preparation method of chemical products, in particular to a preparation method of maleic anhydride grafted polypropylene. Background technique [0002] Polypropylene has excellent comprehensive properties and is a general-purpose polymer material with a wide range of uses. However, due to the non-polarity and low surface energy of polypropylene, it is not easy to wet, bond, print and coat, and the compatibility with polar materials is also poor. Some methods are needed to improve the polarity of polypropylene. A common modification method is to graft monomers such as maleic anhydride, acrylic acid, and glycidyl methacrylate onto polypropylene molecular chains. Among them, the melting grafting method is simple and economical in operation, suitable for industrial production, and is currently the main modification method. [0003] Patent US 5,955,547 discloses that polypropylene and molten maleic anhydride are fed into a twin-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F212/08C08F222/06B29C47/92B29C48/92
Inventor 危大福郑安呐李兴茂管涌李军唐似铁
Owner EAST CHINA UNIV OF SCI & TECH
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