A catalyst component for ethylene polymerization, its preparation method and application
A catalyst and compound technology, applied in the field of supported chromium-based catalyst components, can solve problems such as no disclosure of chromium-based catalyst systems
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Embodiment 1
[0050] Take 10g of silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200° C. for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate into the reactor fully replaced with anhydrous and oxygen-free nitrogen, then add 300 ml of hexane, stir at room temperature to completely dissolve the solid to form a solution. Add 10 g of dried silica gel to the above solution. After stirring, add 2 ml (1.3 M) of a hexane solution of diethylethoxyaluminum. After stirring at room temperature for 1 hour, add 2.4 mmol of 2-isopropyl- 4,4,5,5-tetramethyl-1,3,2-dioxaborolane, stirred at room temperature for 1 hour, and then removed the solvent to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalysts are listed in Table 1.
Embodiment 2
[0052] Take 10g of silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200° C. for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate into the reactor fully replaced with anhydrous and oxygen-free nitrogen, then add 300 ml of hexane, stir at room temperature to completely dissolve the solid to form a solution. Add 10 g of dried silica gel to the above solution, and then add 2.4 mmol of 2-isopropyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane after stirring After stirring at room temperature for 1 hour, add 2 ml (1.3M) of a hexane solution of diethylaluminum ethoxide. After stirring at room temperature for 1 hour, remove the solvent to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalysts are listed in Table 1.
Embodiment 3
[0054] Take 10g of silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200° C. for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate into the reactor fully replaced with anhydrous and oxygen-free nitrogen, then add 300 ml of hexane, stir at room temperature to completely dissolve the solid to form a solution. Add 10 g of dried silica gel to the above solution, and simultaneously add 2 ml (1.3 M) of a hexane solution of diethylethoxyaluminum and 2.4 mmol of 2-isopropyl-4,4,5,5- Tetramethyl-1,3,2-dioxaborolane was stirred at room temperature for 2 hours and then the solvent was removed to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalysts are listed in Table 1.
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