A kind of preparation method of ethylene copolymer
An ethylene copolymer and ethylene technology are applied in the field of preparation of ethylene copolymers, can solve the problems of difficulty in adding comonomers, high comonomers and the like, and achieve the effect of reducing production costs
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[0018] The present invention provides a method for preparing an ethylene copolymer. The method includes first contacting ethylene with a first catalyst precursor in the presence of an organic solvent and a co-catalyst, and then combining the mixture obtained by the first contact with the second catalyst precursor Performing a second contact, wherein the first catalyst precursor is a compound having a structure represented by formula I, and the second catalyst precursor is a compound having a structure represented by formula II,
[0019]
[0020] Where R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 5 ’, R 6 ’, R 7 ’And R 8 'Each independently is hydrogen or a C1-C20 alkyl group;
[0021] The conditions of the first contact include a contact temperature of -30°C to 120°C, a contact pressure of 0.1-1 MPa, and a contact time of 2-15 min; the conditions of the second contact include a contact temperature of -30°C to 150°C, The contact pressure is 0.1-1MPa, and the contact time is 1-6...
Embodiment 1
[0046] This example is used to illustrate the synthesis of ethylene copolymer.
[0047] The 500mL polymerizer after heating and drying was evacuated and ventilated twice with nitrogen, then evacuated and then ventilated with ethylene gas, and then 5mL (12mg / mL) of toluene solution of methylaluminoxane (MAO) was added successively. 150 mL of oxygen-treated n-hexane, and 2 mL (1.98 mg / mL) of a toluene solution containing the first catalyst precursor with the structure represented by formula III (prepared according to the method described in Science 2000, 287,460, the same below). Under mechanical stirring, ethylene with a pressure of 0.1 MPa was introduced and reacted at 20°C for 5 min under this pressure, and then a second catalyst precursor containing the structure represented by formula IV was added (prepared according to the method described in the literature Macromolecules 2005, 38, 1546). Obtained, the same below) 4mL (1.80mg / mL) of toluene solution, keep the pressure and tem...
Embodiment 2
[0053] This example is used to illustrate the synthesis of ethylene copolymer.
[0054] The 500mL polymerizer after heating and drying was evacuated and ventilated twice with nitrogen, then evacuated and then ventilated with ethylene gas, and then 5mL (12mg / mL) of toluene solution of methylaluminoxane (MAO) was added successively. 150 mL of oxygen-treated n-hexane, and 2 mL (1.98 mg / mL) of toluene solution containing the first catalyst precursor with the structure represented by formula III. Pass ethylene with a pressure of 0.1MPa under mechanical stirring, and react at 20°C under this pressure for 5 minutes, and then add 6mL (1.80mg / mL) of toluene solution containing the second catalyst precursor with the structure of formula IV , Keep the pressure and temperature unchanged, continue the reaction for 20 minutes, add ethanol to terminate the reaction, and obtain 3.53 g of ethylene polymer. After calculation, the polymerization activity is 7.1×10. 5 gPE / (molTi·h).
[0055] The melt...
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