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A kind of high-melt-strength polypropylene grafted with heteroaromatic ring derivatives and its preparation method

A high-melt-strength, heteroaromatic-ring technology applied in the field of polypropylene resins

Active Publication Date: 2021-02-26
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the melt elasticity of PP modified by these two methods has increased, the molecular weight of PP has an obvious bimodal distribution or a cross-linked structure can be observed.

Method used

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  • A kind of high-melt-strength polypropylene grafted with heteroaromatic ring derivatives and its preparation method
  • A kind of high-melt-strength polypropylene grafted with heteroaromatic ring derivatives and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1000 g polypropylene, 1 g antioxidant 1010, 0.5 g antioxidant 168, 1 g calcium stearate, 0.6 g nucleating agent hydroxyaluminum p-tert-butylbenzoate, 0.5 g DHBP, 20 g 3-pyridine -1,1-Difluoropropene, mix in a mixer for 20min until uniform. Add the mixture to a twin-screw extruder with L / D=40 and Φ of 35mm, the screw speed is 60 r / min, the feeding speed is 4kg / h, and the rotation number of the extruder is set at 15 rpm . The extruder is divided into four heating zones, the temperature of the first heating zone is set at 175°C, the temperature of the second heating zone is set at 190°C, the temperature of the third heating zone is set at 200°C, and the temperature of the fourth heating zone is set at 200°C , extruded and granulated to obtain long-chain branched polypropylene resin pellets with high melt strength. Some samples were taken for performance testing and melt strength determination. The results are shown in Table 1.

Embodiment 2

[0032] Weigh 1000 g polypropylene, 2 g antioxidant 1010, 1 g antioxidant 168, 1 g calcium stearate, 0.6 g hydroxyaluminum p-tert-butylbenzoate, 0.5 g DHBP, 10 g 3-pyridine-1 , 1-dichloropropene, mixed in a mixer for 20min until uniform. The extrusion granulation process is the same as in Example 1.

Embodiment 3

[0034] Weigh 1000 grams of polypropylene, 1 gram of antioxidant 1076, 0.5 gram of antioxidant 168, 2 grams of erucamide, 0.6 gram of hydroxyaluminum p-tert-butylbenzoate, 0.5 gram of benzoyl peroxide, 20 gram of 2-(pyridine-2-methylene)malononitrile, mixed in a blender for 20min until uniform. The extrusion granulation process is the same as in Example 1.

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Abstract

The invention discloses a high-melt-strength long-chain branched polypropylene grafted with heteroaryl ring derivatives, which mainly consists of the following raw materials in mass ratio: 100% homopolypropylene powder, 0.10-2% antioxidant, and lubricant 0.10~1, peroxide initiator 0.01~3, heteroaromatic ring grafting monomer 0.01~5, nucleating agent 0.01~0.15. The invention also discloses a preparation method of the polypropylene. The polypropylene resin has high melt strength and is especially suitable for applications such as foaming, blister molding, compression molding, and blown film.

Description

technical field [0001] The invention relates to a polypropylene resin, in particular to a high-melt-strength polypropylene grafted with heteroaryl ring derivatives, and simultaneously the invention also relates to a preparation method of the polypropylene. Background technique [0002] Polypropylene (PP) has become the most widely used and produced plastic in the world due to its low density, high melting point, good chemical stability, non-toxicity, easy processing, good mechanical properties, wide source of raw materials, and low price. one. However, traditional isotactic PP is mainly produced by Ziegler-Natta catalysts, and most of the produced PP has a linear structure. In some processing fields that have higher requirements for melt strength and sag resistance, such as Applications such as thermoforming, blow molding and foaming are very limited. The long-chain branched or cross-linked structure in PP has been proven to improve its melt strength, which can be achieved...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F226/06C08K5/134C08K5/526C08K5/098C08K5/20C08K5/52C08L51/06
CPCC08F255/02C08K5/098C08K5/1345C08K5/20C08K5/52C08K5/526C08F226/06C08L51/06
Inventor 刘振宇宋莎王伟哲梁胜彪周小群刘国禹
Owner CHINA PETROLEUM & CHEM CORP
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