Method for preparing polypropylene grafted copolymer
A polypropylene grafting and copolymer technology, which is applied in the field of graft copolymer preparation, can solve the problems of propylene coordination comonomer restriction, polar vinyl monomers are difficult to polymerize, etc., to improve the grafting effect , Simplify the preparation process and reduce the cost
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[0038] Example 1
[0039] The spherical support and polypropylene catalyst were prepared according to the method of CN1109067A.
[0040] (1) Preparation of carrier
[0041] Add 34g of anhydrous magnesium chloride, 80ml of anhydrous ethanol, 100ml of methyl silicone oil (chemically pure, viscosity of 300 cps), 100ml of liquid paraffin (chemically pure, viscosity of 300 cps), under the protection of nitrogen, into a stirrer In a 500ml reaction flask with condenser tube, heat to 120°C and react until magnesium chloride is completely dissolved. While hot, transfer this solution to a mixture of 150ml each of methyl silicone oil and liquid paraffin, and stir at a rate of 2000-3000 rpm 4 Minutes, put it into anhydrous hexane pre-cooled to -30°C, stir until the system temperature rises to room temperature, filter, and wash the obtained solid with 200ml anhydrous hexane 3 times, and vacuum dry to obtain a spherical carrier.
[0042] (2) Preparation of catalyst
[0043] Under the protection...
Example Embodiment
[0044] Example 2
[0045] Prepare the polypropylene graft copolymer of the present invention.
[0046] (1) Prepolymerization of propylene
[0047] Under the protection of nitrogen, 100ml of hexane and 1.0g of co-catalyst Al(C 2 H 5 ) 3 , 0.085g external electron donor-methylcyclohexyldimethoxysilane [CH 3 C 6 H 11 Si(OCH 3 ) 2 ] And 0.08g of solid catalyst A, the molar ratio of aluminum / titanium is 300, and the molar ratio of external electron donor to titanium is 15. Pour propylene gas into the reaction flask at 20°C, and prepolymerize it for 10 minutes at a pressure of 0.1MPa. The mass ratio of the produced polypropylene to the catalyst A was 50.0. Most of the unreacted propylene in the solvent is removed under reduced pressure to obtain a propylene prepolymerized suspension.
[0048] (2) Propylene polymerization
[0049] Add 800ml of hexane into a 2L pressure-resistant stainless steel reactor with stirring, transfer the prepolymerized suspension to the reactor, fill the reactor...
Example Embodiment
[0052] Example 3
[0053] (1) Propylene prepolymerization and polymerization are carried out in the same kettle.
[0054] In a 2L pressure-resistant stainless steel reactor with stirring, add 800ml of hexane, 1.0g of co-catalyst Al(C 2 H 5 ) 3 , 0.085g external electron donor [CH 3 C 6 H 11 Si(OCH 3 ) 2 ] And 0.08g of solid catalyst A, prepolymerized at 20°C and 0.1MPa propylene gas pressure for 10 minutes, the mass ratio of the produced polypropylene to catalyst A was 50.0. The temperature is rapidly increased to 70°C, hydrogen and propylene are introduced, the hydrogen pressure is 0.1 MPa, the total pressure is 0.9 MPa, and the reaction is stirred for 2 hours. The solvent and propylene in the reactor were removed under reduced pressure to obtain 808 g of polypropylene. The activity of the polymerization catalyst and the average diameter and porosity of the obtained polypropylene are shown in Table 1.
[0055] (2) Graft copolymerization
[0056] Take the undried polypropylene obt...
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