Propylene multiphase copolymerization system, polymerization process and polypropylene kettle internal alloy

A technology of alloys in kettles and polypropylene, which is applied in the field of alloys in polypropylene kettles, can solve problems such as reducing the toughening effect, and achieve the effects of low cost, easy implementation, and obvious toughening effects

Active Publication Date: 2012-12-26
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that after melt processing of polypropylene reactor alloys, the domain size of ethylene-propylene random copolymers in the polypropylene matrix can increase to more than 10 μm (Journal of Polymer Science Part B: Polymer Physics, 1994, 32(7) : 1205.Polymer, 2011, 52 (13): 2956), significantly reduced the toughening effect of the rubber phase ethylene-propylene random copolymer on the polypropylene matrix resin

Method used

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  • Propylene multiphase copolymerization system, polymerization process and polypropylene kettle internal alloy
  • Propylene multiphase copolymerization system, polymerization process and polypropylene kettle internal alloy
  • Propylene multiphase copolymerization system, polymerization process and polypropylene kettle internal alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1), propylene homopolymerization

[0052] In a 500ml dry autoclave, first add 50ml of dry n-hexane, then add 1ml of triethylaluminum with a concentration of 1.8mol / L, 19.6mg of the Ziegler-Natta catalyst prepared above, and keep the aluminum-titanium ratio: Al: Ti=100:1 (molar ratio), then feed propylene gas, polymerize at 60°C under 0.4MPa pressure for 15 minutes to obtain polypropylene particles, and proceed directly to the next step of reaction.

[0053] (2), ethylene-propylene copolymerization

[0054] The propylene gas in the above step (1) is vented, and then the gas molar ratio is 1:1 ethylene-propylene mixed gas, and when the polymerization system pressure is 1atm, add 1ml of 1,9-decadiene mono Carry out ethylene-propylene copolymerization in a hexane solvent system, the polymerization temperature is controlled at 60°C, the pressure is 0.4MPa, and the copolymerization reaction takes 5 minutes. After the polymerization was completed, the gas pressure in the au...

Embodiment 2

[0056] (1), propylene homopolymerization

[0057] In a 500ml dry autoclave, first add 50ml of dry n-hexane, then add 1ml of triethylaluminum with a concentration of 1.8mol / L, 24.0mg of the Ziegler-Natta catalyst prepared above, and keep the aluminum-titanium ratio: Al: Ti = about 100:1 (molar ratio), then feed propylene gas, polymerize at 60°C and 0.4MPa for 30 minutes to obtain polypropylene particles, and proceed to the next step of reaction directly.

[0058] (2), ethylene-propylene copolymerization

[0059] The propylene gas in the above step (1) is vented, and then the gas molar ratio is 1:1 ethylene-propylene mixed gas, and when the system pressure is 1atm, quickly inject 3ml of 1,9-decadiene The monomers are directly copolymerized with ethylene-propylene and diene monomers in a hexane solvent system, the polymerization temperature is controlled at 60° C., the pressure is 0.4 MPa, and the copolymerization reaction is carried out for 5 minutes. After the polymerization ...

Embodiment 3

[0061] (1), propylene homopolymerization

[0062] In a 500ml dry autoclave, first add 50ml of dry n-hexane, then add 1.5ml of triethylaluminum with a concentration of 1.8mol / L, 27.1mg of the Ziegler-Natta catalyst prepared above, and keep the aluminum-titanium ratio: Al : Ti = about 100:1 (molar ratio), then feed propylene gas, polymerize at 60°C and 0.4MPa for 30min to obtain polypropylene particles.

[0063] (2), ethylene-propylene copolymerization

[0064] Vent the propylene gas in the above step (1), and use a vacuum pump to remove the hexane solvent in the polymerization system. The vacuum degree is about 5 mmHg, and the removal time is about 5 minutes. After removing the hexane solvent, the ethylene-propylene mixed gas with a gas molar ratio of 1:1 was quickly passed into the kettle. When the pressure inside the reactor was 1 atm, 1 ml of 1,9-decadiene monomer was injected rapidly, and the copolymerization reaction of ethylene-propylene and diene monomer in the gas pha...

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Abstract

The invention discloses a propylene multiphase copolymerization system, a polymerization process and a product. Through the adoption of the propylene multiphase copolymerization system, fusion and aggregation of dispersion phases of ethylene-propylene random copolymers in a polypropylene / ethylene-propylene random copolymer reactor alloy are effectively suppressed. According to the invention, except for conventional components such as a propylene catalyst, a promoter, external electron donor and the like, the key component of the propylene multiphase copolymerization system is an aliphatic or aromatic symmetric diene monomer, so as to achieve stabilization of the dispersion phases of the ethylene-propylene random copolymers. The polymerization process is carried out by using a typical propylene two-section or multi-section polymerization process and is suitable for more industrially mature polymerization processes. Meanwhile, according to the invention, the polymerization product has spherical particles and has a multi-phase structure; and the dispersion phase of the polymerization product is an ethylene-propylene random copolymer provided with a branched or cross-linked structure and containing a double-alpha-olefin monomer unit.

Description

technical field [0001] The invention relates to a propylene heterogeneous copolymerization system, a polymerization method and an alloy in a polypropylene kettle. Background technique [0002] Polypropylene is an indispensable synthetic material in our life, and it is also one of the most widely used and fastest growing resins. It has the advantages of low density, high melting point, easy processing, excellent impact resistance, and good insulation performance. In recent years Since then, it has become a synthetic resin with the fastest growth in output, the most varieties and grades, and the widest range of uses. [0003] Propylene heterogeneous copolymerization refers to the use of the fourth and fifth generation of high-efficiency MgCl with good particle shape control ability 2 Carrier catalyst, ethylene-propylene random copolymerization is assisted after propylene homopolymerization, so that a polypropylene / ethylene-propylene copolymer reactor alloy with excellent impa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F210/16C08F210/18C08F4/646C08F4/02C08L23/12C08L23/16C08L23/08C08L23/14
CPCC08L23/142C08F110/06C08L23/16C08L2314/02C08F10/06C08F2/001C08F210/18C08F210/06C08F236/20C08F2500/20C08F210/16
Inventor 董金勇师建军牛慧秦亚伟黄英娟
Owner INST OF CHEM CHINESE ACAD OF SCI
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