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A polyethylene and metallocene catalyst technology, applied in the field of metallocene polyethylene preparation, can solve the problems of poor resin processing performance, narrow resin molecular weight distribution, difficulty in catalyst selection, etc., achieve good processing performance, easy preparation, and simple catalyst structure Effect
Active Publication Date: 2015-07-22
CHINA PETROLEUM & CHEM CORP +1
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This makes the choice of catalyst very difficult
[0005] Melt flow ratio MFR(=MI 21.6kg / MI 2.16kg ) is an effective means to characterize resin processability, the melt flow ratio of metallocene polyethylene resin prepared by common metallocene catalyst is about 17, the processability of resin is poor, the molecular weight distribution of resin is narrow, Mw / Mn<3
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Embodiment 1
[0035] The preparation of embodiment 1 load type MAO (SMAO)
[0036] Add 20 grams of activated 955 silica gel (activation condition 600°C, 4 hours) into a 250ml glass bottle replaced with nitrogen, add 30ml of toluene, raise the temperature of the system to 50°C, add dropwise the toluene solution of MAO (11g MAO), and react After 4 hours, filter, wash 3 times with 30ml toluene, then wash 2 times with hexane, and drain to obtain a white carrier with good fluidity, Al%: ~14 (ICP).
Embodiment 2
[0037] The preparation of embodiment 2 supported catalyst A
[0038] In the 250ml glass bottle replaced with nitrogen, add 2g of SMAO prepared in Example 1, add 20ml of toluene, start stirring, add dropwise 10ml of compound EtInd at room temperature 2 ZrCl 2 Toluene solution (containing 43mg compound, Al / Zr=100), reacted under stirring for 30min, filtered, washed with 30ml hexane, filtered, and dried to obtain an orange powder with good fluidity, that is, catalyst A.
Embodiment 3
[0039] The preparation of embodiment 3 supported catalyst B
[0040] In the 250ml glass bottle replaced with nitrogen, add 2g of SMAO prepared in Example 1, add 20ml of toluene, start stirring, add dropwise 10ml of compound Me at room temperature 2 SiInd 2 ZrCl 2 Toluene solution (containing 47mg compound, Al / Zr=100), reacted under stirring for 30min, filtered, washed with 30ml hexane, filtered and dried to obtain a light yellow powder with good fluidity, that is, catalyst B.
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Abstract
The invention provides a method for preparing polyethylene. The method comprises a step that ethylene and alpha-olefin polymerize under a single supported bridged metallocene catalyst to obtain polyethylene, wherein the molecular weight distribution of polyethylene is 3-5, the supported bridged metallocene catalyst comprises a bridged metallocene compound, a cocatalyst and a supporter, the bridged metallocene compound has a chemical formula of Cp'XCp'MQ2, Cp' in the formula is a metallocene ligand selected from cyclopentadiene derivative groups, X in the formula is a bridged group, M in the formula is one selected from elements in Group IVB in Periodic Table of the Elements, Q in the formula is selected from halogens, the cocatalyst is aluminoxane, and the supporter comprises an inorganic supporter or an organic supporter. The use of the single supported bridged metallocene catalyst in the ethylene polymerization allows the molecular weight of the obtained polyethylene to have a wide distribution, the fusion-flow ratio of polyethylene is high (30-200), the processability of polyethylene is good, and the density of polyethylene is 0.900-0.948g / cm<3>, so polyethylene can be used for making films or tubes.
Description
technical field [0001] The invention relates to the field of preparation of metallocene polyethylene, in particular to a metallocene polyethylene with good processability and wide molecular weight distribution and a preparation method thereof. Background technique [0002] In the field of olefin polymerization, metallocene catalysts catalyze olefin polymerization to obtain polymers with narrow molecular weight distribution and narrow branch chain distribution. Due to the wide choice of catalyst ligands and strong ability to regulate polymers, it can realize "customization" of polymers, and its application range in olefin polymerization is becoming wider and wider. In terms of catalyzing ethylene polymerization, the MWD of polymers prepared by metallocene catalysts is relatively narrow, which leads to poor processability of metallocene polyolefins. One of the ways to improve resin processability is to produce polymers with bimodal or broad molecular weight distributions. Be...
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