Olefin polymerization catalyst composition and its application
An olefin polymerization and compound technology, which is applied to the above catalyst composition in the field of olefin polymerization, can solve problems such as complicated preparation methods, and achieve the effects of simple catalytic system, easy preparation and control, and high catalyst activity
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Embodiment 1
[0025] The synthesis of ligand A, ligand A is the ligand shown in formula I, wherein R 1 =R 2 =R 3 =R 4 =CH 3 .
[0026] The ligand preparation method is: add NaH (1.2g, 30mmol) and 30mL anhydrous tetrahydrofuran into a 100mL round bottom flask, and place it in an ice-water bath to cool. Slowly add 3,5-dimethylpyrazole (2.9g, 30mmol), gas is released, continue to stir for 30 minutes, add 1mL thionyl chloride, the reaction solution turns from brown-gray transparent to off-white, remove the ice-water bath, and Stir for 30 minutes, add pyrrole aldehyde (2.9 g, 15 mmol) protected by tert-butoxycarbonyl (Boc), reflux in an 80°C oil bath for 6 hours, then quench the reaction with saturated aqueous sodium bicarbonate, and dilute the reaction solution with ethyl acetate Extraction three times, column chromatography gave yellow oil I' (3.3g, 62.0%). Dissolve Na (0.23g, 10mmol) in 30mL double-distilled ethanol, continue to stir for 15min after the dissolution is complete, then dis...
Embodiment 2
[0029] The synthesis of ligand B, ligand B is the ligand shown in formula I, wherein R 1 =R 2 =R 3 =R 4 =H.
[0030] The preparation method is the same as Ligand Synthesis Example 1, except that 3,5-dimethylpyrazole is replaced by pyrazole, and other conditions remain unchanged. Yield 73.9%. 1 H-NMR (δ, ppm, CDCl 3, TMS): 7.6 (s, 1H, CH), 7.5-6.2 (m, 9H, Pyrrole-HandPyrazole-H), 5.0 (s, 1H, NH).
[0031] Polymerization Example
Embodiment 3
[0033] A stainless steel polymerization kettle is used. The polymerization kettle was heated to 100°C, evacuated and replaced with nitrogen for several times, and then filled with ethylene until the pressure of ethylene was 2 MPa and the temperature was lowered to room temperature. Then add dehydrated toluene at 70°C, and at the same time add 10 μmol of the ligand compound (ligand A), chromium chloride and methylaluminoxane in Example 1. The total volume of the mixed solution is 100 mL, wherein the ligand compound : The molar ratio of chromium chloride: methyl aluminoxane (MAO) is 1:1:200, that is, the addition of chromium chloride is 10 μmol, the addition of methyl aluminoxane is 2 mmol, and the reaction pressure is controlled at 2.0 MPa. Ethylene undergoes ethylene oligomerization.
[0034] After the reaction was completed, the system was cooled to room temperature, the gas phase product was collected in a gas metering tank, and the liquid phase product was collected in an ...
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