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Long chain branching polypropylene random copolymer and preparation method thereof

A technology of random copolymerization and long-chain branching, which is applied in the field of preparation of random copolymerized polypropylene, can solve problems such as shortage, and achieve the goal of increasing β-crystal content, excellent processability and mechanical properties, and low melt flow rate Effect

Inactive Publication Date: 2015-12-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, the art lacks an effective method for preparing random copolymerized polypropylene with high β-crystal content while modifying long-chain branching

Method used

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  • Long chain branching polypropylene random copolymer and preparation method thereof
  • Long chain branching polypropylene random copolymer and preparation method thereof

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Experimental program
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Embodiment 1

[0039] The preparation method of the embodiment of the present invention 1 is as follows:

[0040] 1) Weigh 4 parts by weight of rare earth organic complex β-nucleating agent and evenly disperse it in a small amount of acetone to form the first dispersion liquid, and then uniformly mix it with 96 parts by weight of random copolymerized polypropylene and volatilize the solvent before extruding on twin-screw Melt extrusion granulation in the machine, the heating temperature of each section of the extruder is: 170°C, 180°C, 190°C, 195°C, 200°C, 195°C, the screw speed is 120rpm, and the β masterbatch is obtained;

[0041] 2) Evenly mix 0.03 parts by weight of dibenzoyl peroxide and 1.5 parts by weight of trimethylolpropane triacrylate in a small amount of acetone to form a second dispersion, and then mix with 100 parts by weight of random copolymerized polypropylene, 7.5 parts by weight of the above-mentioned β masterbatch (equivalent to 0.3 parts by weight of β-nucleating agent),...

Embodiment 2

[0060] The preparation method of embodiment 2 is as follows:

[0061] 1) Weigh 4 parts by weight of the rare earth organic complex β-nucleating agent and evenly disperse it in a small amount of acetone to form the first dispersion liquid, and then mix it with 96 parts by weight of random copolymerized polypropylene and volatilize the solvent before extruding on a twin-screw Melting extrusion granulation in the extruder, the heating temperature of each section of the extruder is: 160°C, 175°C, 185°C, 195°C, 200°C, 195°C, the screw speed is 130rpm, and the β masterbatch is obtained;

[0062] 2) Evenly mix 0.03 parts by weight of azobisisobutyronitrile and 1 part by weight of trimethylolpropane triacrylate in a small amount of acetone to form a second dispersion, and then mix them with 100 parts by weight of random copolymerized polypropylene, 7.5 parts by weight of the above-mentioned random β masterbatch and 0.05 parts by weight of antioxidant are mechanically mixed uniformly a...

Embodiment 3

[0065] The preparation method of embodiment 3 is as follows:

[0066] 1) Weigh 4 parts by weight of the rare earth organic complex β-nucleating agent and evenly disperse it in a small amount of acetone to form the first dispersion liquid, and then mix it with 96 parts by weight of random copolymerized polypropylene and volatilize the solvent before extruding on a twin-screw Melting extrusion granulation in the extruder, the heating temperature of each section of the extruder is: 170°C, 180°C, 190°C, 195°C, 200°C, 195°C, the screw speed is 130rpm, and the β masterbatch is obtained;

[0067] 2) Evenly mix 0.03 parts by weight of azobisisobutyronitrile and 2 parts by weight of trimethylolpropane triacrylate in a small amount of acetone to form a second dispersion, and then mix them with 100 parts by weight of random copolymerized polypropylene, 10 parts by weight of the above-mentioned β masterbatch and 0.05 parts by weight of antioxidant are mechanically mixed uniformly and the ...

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Abstract

The invention discloses long chain branching polypropylene random copolymer and a preparation method thereof. The method includes the steps of dispersing a beta nucleating agent in solvent to form first dispersion liquid, evenly mixing the first dispersion liquid with polypropylene random copolymer to form a mixture, obtaining a beta material batch through melting extrusion after the solvent is evaporated, dispersing long chain branching monomers and free radical initiator in solvent to form second dispersion liquid, evenly mixing the second dispersion liquid with the beta material batch and polypropylene random copolymer, and preparing the long chain branching polypropylene random copolymer with the beta crystal content larger than or equal to 60% through a melting reaction and extrusion after solvent is evaporated. The long chain branching polypropylene random copolymer has the low melt flow rate and high impact strength, tensile strength and elongation at break, is excellent in both processing performance and mechanical property, and is suitable for the application fields of foaming, thermal forming, thin film blow molding, extrusion coating, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of random copolymerized polypropylene, and specifically relates to a preparation method of long-chain branched random copolymerized polypropylene with high beta-crystal content obtained through modification of beta crystals and modification of long-chain branching. Background technique [0002] Polypropylene is one of the most widely used and fastest growing resins in the world. Random copolymerized polypropylene is a kind of polypropylene, which is obtained by copolymerization of propylene and a small amount (mass fraction 1~7%) of ethylene under certain temperature, pressure and catalyst, in which ethylene monomers are randomly and randomly distributed in polypropylene in the long chain. This structural feature makes random copolymerized polypropylene have better overall performance than traditional homopolymerized polypropylene. However, on the one hand, due to the linear structure of commercial ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/04C08F222/14C08K5/00B29C47/92B29C48/92
Inventor 曹静孙茜茜邹海强
Owner FUZHOU UNIV
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