A kind of preparation method of propylene-ethylene random copolymer

A kind of preparation method of propylene-ethylene random copolymer

  • CN 102,453,186 B
  • Filed: 10/29/2010
  • Issued: 04/27/2016
  • Est. Priority Date: 10/29/2010
  • Status: Active Grant
First Claim
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1. a preparation method for propylene-ethylene random copolymer, the method in the steps below order is carried out:

  • (1) liquid phase prepolymerization of in the presence of a catalyst, carrying out propylene continuously closes reaction;

    (2) in ring canal reaction device, in presence of hydrogen, carry out the liquid phase copolymerization of propylene and ethene continuously, the polymerization temperature wherein in ring canal reaction device is 65 DEG C ~ 95 DEG C, and endless tube density is 350g/L ~ 650g/L;

    (3) optionally, carry out the gas phase copolymerization reaction of propylene and ethene in gas-phase reaction device continuously, the temperature of gas phase copolymerization is 70 DEG C ~ 90 DEG C, and pressure is 1MPa ~ 3MPa;

    Described catalyzer, propylene, ethene and hydrogen enter in reactor continuously;

    Described catalyzer comprises Primary Catalysts, promotor and external electron donor;

    The mass ratio of the add-on of catalyzer and the add-on of propylene is;

    0.00001 ~ 0.0001;

    Wherein the mass ratio of added hydrogen and propylene add-on is 0.00001 ~ 0.0005;

    The mass ratio of ethene add-on and propylene add-on is 0.01 ~ 0.04;

    Described Primary Catalysts is a kind of ingredient of solid catalyst, and this ingredient of solid catalyst comprises magnesium, titanium, halogen and electron donor, and described electron donor is selected from least one dibasic alcohol ester compound in following general formula (I);

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