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A catalyst component for ethylene polymerization and its preparation method

A technology for ethylene polymerization and catalysts, which is applied in the field of supported chromium-based catalyst components, and can solve the problems of complex preparation process, aging, and long time consumption

Active Publication Date: 2018-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned patents, the method of coprecipitation or co-gelation of silicon oxide, titanium, magnesium and chromium compounds is adopted, and the chromium-containing catalyst is prepared from silica gel containing titanium, magnesium, and chromium. The glue is spray-dried or azeotropically dried, and the obtained carrier needs to be aged for a long time at a basically neutral pH value, and even a pore-preserving agent needs to be added
Such a preparation process is very complicated, takes a long time, and because the aging process has a decisive impact on the pore structure of the catalyst, the stability of the catalyst preparation is poor

Method used

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  • A catalyst component for ethylene polymerization and its preparation method
  • A catalyst component for ethylene polymerization and its preparation method
  • A catalyst component for ethylene polymerization and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0042] Preparation of Titanium Magnesium Compounds

[0043] 1. In 150ml of heptane, add 5g (52.6mmol) of magnesium chloride and 34.3g (150mmol) of tetraethoxytitanium, cool under reflux for three hours, filter the mother liquor, and then add 100ml of heptane for recrystallization to obtain 23.6 white crystals of g [Ti 2 (OC 2 h 5 ) 8 Cl] 2 Mg 2 Cl 2 .

[0044] 2. In 150ml of heptane, add 5g (52.6mmol) of magnesium chloride and 51.1g (150mmol) of tetrabutoxytitanium, cool under reflux for three hours, filter the mother liquor, and then add 100ml of heptane for recrystallization to obtain 26.2 white crystals of g [Ti 2 (OC 4 h 9 ) 8 Cl] 2 Mg 2 Cl 2 .

[0045] Preparation of catalyst components

Embodiment 1

[0047] Take 10g of silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the specific surface area is about 245-375m 2 / g) Dry at 200° C. for 4 hours under nitrogen fluidization. Add 2.6g titanium magnesium compound [Ti 2 (OC 2 h 5 ) 8 Cl] 2 Mg 2 Cl 2 and 0.5 g of bis(triphenylsilyl) chromate, then add 300 ml of hexane, and stir at room temperature to completely dissolve the solid to form a solution. 10 g of dried silica gel was added to the above solution, after stirring, 4 ml (1.3 M) of a hexane solution of diethylethoxyaluminum was added, and after stirring at room temperature, the solvent was removed to obtain a chromium-containing catalyst component. The contents of chromium, titanium, magnesium and aluminum in the catalyst components are listed in Table 1, and the polymerization evaluation results of the catalyst are listed in Table 2.

Embodiment 2

[0049] Except that the addition of bis(triphenylsilyl) chromate was changed from 0.5 g to 0.3 g, the preparation method of the catalyst component was the same as in Example 1.

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Abstract

The invention discloses a catalyst component for ethylene polymerization. The catalyst component includes a titanium magnesium compound and a chromium compound that are loaded on a carrier together. The molecular formula of the titanium magnesium compound is [Ti2(OR1)2(OR2)2(OR3)2(OR4)2X]2Mg2X2, wherein R1, R2, R3, and R4 can be the same or different, and are selected from one of hydrogen, halogen, straight chain or branched chain alkyl of C1-C20, cycloalkyl of C3-C20, aryl of C6-C20, alkaryl of C7-C20 and aralkyl of C7-C20, and X is fluorine, chlorine, bromine or iodine; and the chromium compound is silane chromic acid ester. The invention also provides a preparation method of the catalyst component and an ethylene polymerization catalyst containing the component. The catalyst improves the polymerization activity of chromium catalysts when it is used for ethylene polymerization, and at the same time broadens the molecular weight distribution of polyethylene resin.

Description

technical field [0001] The invention relates to a supported chromium catalyst component for homopolymerization of ethylene or copolymerization of ethylene and α-olefin. More specifically, it relates to a supported chromium catalyst component modified with titanium and magnesium, as well as the preparation method and application of the catalyst component. Background technique [0002] Ethylene polymers have been widely used as resin materials for various film products, and ethylene polymers are required to have different properties depending on the film-making method and purpose. For example, polymers with lower molecular weights and narrow molecular weight distributions are suitable for articles made into films by injection molding. On the other hand, polymers with higher molecular weight and broad molecular weight distribution are suitable for articles made into films by blown or air-filled film processes. Medium to high molecular weight polyethylenes are required in many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F110/02C08F210/16C08F4/02C08F4/69C08F4/646
Inventor 王洪涛周梦楠崔楠楠周俊领闫力欣刘树军
Owner CHINA PETROLEUM & CHEM CORP