Multi-phase polypropylene copolymer having high ethylene-propylene rubber content and preparation method thereof

A technology of heterophasic polypropylene and rubber content, applied in the field of high-performance modification of polypropylene, to achieve the effect of high transparency, improved affinity, and improved softness

Active Publication Date: 2013-06-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the rigidity-toughness balance requirements of impact polypropylene copolymers and the limitations of the production process, the mass fraction of ethylene-propylene rubber in commercial products is usually controlled at 5% to 25%, which is strictly still a plastic. Especially in the field of low temperature environment that requires high toughness, it is still powerless

Method used

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  • Multi-phase polypropylene copolymer having high ethylene-propylene rubber content and preparation method thereof
  • Multi-phase polypropylene copolymer having high ethylene-propylene rubber content and preparation method thereof
  • Multi-phase polypropylene copolymer having high ethylene-propylene rubber content and preparation method thereof

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preparation example Construction

[0028] Preparation of propylene homopolymer:

[0029] (1) Propylene prepolymerization

[0030] Before the experiment, the reactor was replaced with nitrogen at least three times, and vacuum-dried at 100 °C for 2 h, and then filled with propylene gas to make the pressure slightly higher than normal pressure, while the temperature dropped to 20 °C. Add n-heptane successively, cocatalyst Al(C 2 h 5 ) 3 , external electron donor Cp 2 Si(OCH 3 ) 2 , and 0.05g of the main catalyst. The molar ratio of aluminum in the cocatalyst to titanium in the main catalyst is 100, and the molar ratio of the external electron donor to titanium is 5. The main components of the main catalyst are: TiCl 4 , MgCl 2 , and diisobutyl phthalate, are spherical particles with a particle size of 20-150 microns. Its titanium content is 2.5~3.5wt%. The reaction conditions for the prepolymerization are: pressure 0.1 MPa, temperature 20° C., and time 20 minutes. The product of propylene prepolymeriza...

Embodiment 1

[0035] Propylene prepolymerization and propylene homopolymerization are carried out in the same preparation method as propylene homopolymer.

[0036] After the homopolymerization of propylene was terminated for 0.5 hours, the pressure in the reactor was reduced to -0.09 MPa (gauge pressure), and the solvent was extracted under reduced pressure and maintained for 10 minutes. Set the homopolymerization time of propylene to 20 minutes and the copolymerization time of ethylene-propylene to 60 minutes through the control device, and set the homopolymerization of propylene first. Open the inlet valve at the bottom of the tank, and the gas phase polymerization begins: firstly, the homopolymerization of propylene is carried out, and the propylene gas (the molar percentage of hydrogen is 1%) is continuously fed from the bottom of the reactor through one of the valves at the bottom of the reactor, and the unreacted monomer It is continuously discharged through the tail gas valve to keep...

Embodiment 2

[0038] Propylene prepolymerization and propylene homopolymerization are carried out in the same preparation method as propylene homopolymer.

[0039] After the homopolymerization of propylene was terminated for 0.5 hours, the pressure in the kettle was reduced to -0.09 MPa (gauge pressure), and the solvent was extracted under reduced pressure and maintained for 10 minutes. Set the homopolymerization time of propylene to 2 minutes and the copolymerization time of ethylene-propylene to 6 minutes through the control device, and set the homopolymerization of propylene first. Open the inlet valve at the bottom of the tank, and the gas phase polymerization reaction starts: firstly, the homopolymerization of propylene is carried out, and the propylene gas (the molar percentage of hydrogen is 1%) is continuously fed from the bottom of the reactor through one of the valves at the bottom of the reactor, and the unreacted single The body is continuously discharged through the tail gas va...

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Abstract

The invention discloses a multi-phase polypropylene copolymer having a high ethylene-propylene rubber content. The multi-phase polypropylene copolymer comprises the following components in percentage by weight: 10-70% of propylene polymer matrix, 25-70% of ethylene-propylene random copolymer and 5-20% of ethylene-propylene block polymer. According to the invention, the multi-phase polypropylene copolymer has an ethylene-propylene rubber content of no less than 30wt%, and has excellent toughness and high shock strength (especially low-temperature shock strength). The invention also discloses a preparation method of the multi-phase polypropylene copolymer having a high ethylene-propylene rubber content. The preparation method combines propylene polymerization and gas phase ethylene-propylene copolymerization.

Description

technical field [0001] The invention relates to the field of high-performance modification of polypropylene, in particular to a heterophasic polypropylene copolymer with high ethylene-propylene rubber content and a preparation method thereof. Background technique [0002] Polypropylene is a thermoplastic resin obtained by polymerizing propylene. According to the arrangement of methyl groups, it can be divided into three types: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. When the methyl groups are arranged on the same side of the molecular main chain, it is called isotactic polypropylene. If the methyl groups are arranged randomly on both sides of the molecular main chain, it is called atactic polypropylene. When the methyl groups are arranged alternately on both sides of the molecular main chain, it is called interstitial polypropylene. Regular polypropylene. [0003] Polypropylene, as the fastest growing general-purpose synthetic resin, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/06C08F110/06C08F293/00C08F2/34C08L23/14
Inventor 冯连芳田洲傅智盛顾雪萍范志强王嘉骏
Owner ZHEJIANG UNIV
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