Loaded metallocene catalyst and preparation method thereof

[0063] This example is used to illustrate the supported metallocene catalyst and its preparation method according to the present invention.

[0064] SBA-15 (commercially purchased from Jilin University High-Tech Co., Ltd., Changchun, Jilin) ​​and silica gel 955 (purchased from Shandong Lianke Silica Co., Ltd., with an average diameter of 20 microns and a specific surface area of ​​250m 2 / g) calcined at 400°C for 10 hours under the protection of nitrogen at a weight ratio of 1:2 to remove hydroxyl groups and residual moisture, thereby obtaining a carrier (named SBA-15-955-1);

[0065] Transfer 1.14 g of SBA-15-955-1 to a 250 ml glass reactor fully replaced by nitrogen, add 10 ml of refined toluene (refluxing with sodium for 24 hours before toluene is used) and 1.14 g of methylalumoxane ( commercially available from Albemarle, USA), and stirred at 50° C. for 4 hours. After the reaction was completed, let it stand, and filter out the liquid after the layers were separated, and w

[0075] This experimental example is used to illustrate the catalytic efficiency of the supported metallocene catalyst according to the present invention.

[0076] In a 2-liter stainless steel autoclave, replace three times each with nitrogen and ethylene, then add 200 ml of hexane, raise the temperature of the kettle to 80 ° C, then add 800 ml of hexane, and add 2 ml of hexane with the addition of hexane 1 mol / liter triethylaluminum (TEA) hexane solution, then add 61 mg of SBA-15-955-BU-1, continue to feed ethylene to raise the pressure to 1.0MPa and maintain it at 1.0MPa, and react at 70°C 1 hour. Obtain 334 grams of polyethylene particle powder, the bulk density (BD) of this polyethylene particle powder is 0.336g / mL, melt index MI 2.16 = 0.069 g / 10 min. It is determined by calculation that the efficiency of the catalyst is 5475gPE / (gcat h) (ie, 1.06×10 8 g PE / (molZr h)).

[0078] This experimental example is used to illustrate the catalytic efficiency of the supported metallocene catalyst according to the present invention.

[0079] In a 2-liter stainless steel autoclave, replace three times each with nitrogen and ethylene, then add 200 ml of hexane, raise the temperature of the kettle to 80 ° C, then add 800 ml of hexane, and add 2 ml of hexane with the addition of hexane 1 mol / L of triethylaluminum (commercially purchased from Zhejiang Freed Chemical Co., Ltd.) hexane solution and 10 mL of hexene, followed by adding 40.3 mg of SBA-15-955-BU-1, raising the ethylene pressure to 1.0 MPa was maintained at 1.0 MPa, and reacted at 70°C for 1 hour. Obtain 220 grams of polymkeric substance, the bulk density (BD) of this polymkeric substance is 0.306g / mL, melt index MI 2.16 = 0.405 g / 10 min. It was determined by calculation that the efficiency of the catalyst was 5459g PE / (gcat h) (ie, 1.06×10 8 gPE / (molZr h)).