Modified polyolefin catalyst as well as preparation method and application thereof
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A technology of polyolefin catalyst and modifier, applied in the field of modified polyolefin catalyst and preparation thereof
Pending Publication Date: 2022-07-29
宁波链增新材料科技有限公司
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However, the low active center loading concentration makes the carrier not easy to break during the polymerization process, resulting in a large amount of inorganic ash in the product
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Embodiment 1
[0026] Using MgCl in Comparative Example 1 2 Loaded TiCl 4 Catalyst (Ziegler-Natta catalyst) 1.0g, add 100mL n-hexane, add 0.1g hexamethylcyclotrisiloxane at 30°C, stir for 30min, filter out the supernatant, dry to free flow to obtain modified olefin Polymerization Catalyst A. Take olefin polymerization catalyst A with a Ti molar content of 10 μmol, add 500 mL of n-hexane, raise the temperature to 70 ° C, add 1 mol of triethyl aluminum, feed ethylene to a pressure of 10 bar, and polymerize for 1 h to obtain 310.5 g of polyethylene. GPC After the measurement, the molecular weight of the product was 2303000 g / mol and the molecular weight distribution was 3.5.
Embodiment 2
[0028] Using MgCl in Comparative Example 1 2 Loaded TiCl 4 1.0g catalyst (Ziegler-Natta catalyst), add 100mL n-hexane, add 0.01g cage polysilsesquioxane at 30°C, stir for 30min, filter out the supernatant, dry to free flow, and obtain the modified olefin Polymerization Catalyst B. Take olefin polymerization catalyst B with a Ti molar content of 10 μmol, add 500 mL of n-hexane, raise the temperature to 70 ° C, add 1 mol of triethyl aluminum, feed ethylene to a pressure of 10 bar, and polymerize for 1 h to obtain 152.2 g of polyethylene. After measurement, the molecular weight of the product was 1,840,000 g / mol, and the molecular weight distribution was 4.3.
Embodiment 3
[0030] Using MgCl in Comparative Example 1 2 Loaded TiCl 4 1.0 g of catalyst (Ziegler-Natta catalyst), add 100 mL of n-heptane, add 1.0 g of cage-type polysilsesquioxane at 30°C, stir for 90 min, filter out the supernatant, and dry to free flow to obtain a modified Olefin polymerization catalyst C. Take olefin polymerization catalyst C with a Ti molar content of 10 μmol, add 500 mL of n-heptane, raise the temperature to 70 ° C, add 1 mol of triisobutyl aluminum, feed ethylene to a pressure of 10 bar, and polymerize for 1 h to obtain 127.3 g of polyethylene, After measurement by GPC, the molecular weight of the product was 2,450,000 g / mol, and the molecular weight distribution was 3.1.
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Abstract
The invention relates to a modified polyolefin catalyst, which is characterized by comprising a supported main catalyst and a modifier, and the preparation process is as follows: (1) suspending the supported main catalyst in an inert solvent A to obtain a suspension A; and (2) adding a modifier into the suspension A, mixing, filtering and drying to obtain the modified polyolefin catalyst, (3) the modifier comprises a compound which contains C-X and Si-X functional groups and can be dissolved in a solvent A, wherein X comprises one of F, Cl, Br, I, O and S and a combination of F, Cl, Br, I, O and S; (4) the supported main catalyst is one of a Ziegler-Natta catalyst, a metallocene catalyst, a late transition metal catalyst, an FI catalyst and a chromium-based catalyst; and (5) the modified catalyst can be used for alpha-olefin polymerization. According to the invention, the modifier is introduced into the formed supported catalyst, so that the distribution and catalytic characteristics of original active sites of the catalyst are changed, and polyolefin with narrower molecular weight distribution can be obtained with higher polymerization activity.
Description
technical field [0001] The invention relates to a modified polyolefin catalyst, a preparation method and application thereof, and belongs to the field of catalysts. Background technique [0002] Polyolefin is an indispensable basic material and strategic material for national economy and national defense construction. In industry, in order to meet the stable operation of industrial devices, polyolefins need to be produced using supported catalysts. This supported catalyst can inhibit the sticking of the reactor wall, and obtain spherical-like and high bulk density polyolefin particles, which has irreplaceable advantages in particle transportation, transportation, storage, processing and other links. Usually, a supported catalyst needs to use a rigid inorganic carrier, an organic carrier (such as a polymer), or an inorganic / organic composite carrier to disperse the metal active centers of the catalyst. On the one hand, the excellent particle morphology of the support is use...
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