Ethylene-alpha-olefin copolymerization catalyst and preparation and applications thereof

A technology of olefin copolymerization and catalyst, which is applied in the field of olefin polymerization catalysts, can solve the problems of failure to realize the copolymerization of ethylene and 1-hexene, difficult separation of catalyst solids, uneven distribution of 1-hexene, etc., and achieve low cost, good shape, The effect of less polymer fine powder

Active Publication Date: 2014-12-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of ethylene copolymerization disclosed in CN1229092A is to dissolve magnesium chloride in organic epoxy compounds, organic phosphorus compounds and then add electron donors to form a uniform solution, and then react with at least one precipitation aid and transition metal titanium halides and derivatives thereof and obtain; the catalyst catalyzes ethylene and 1-hexene copolymerization activity high, and the 1-hexene insertion rate in the copolymer is higher, but the mother liquor of this catalytic system is more viscous in the preparation process, and it is difficult to separate the catalyst solid from the mother liquor, and the copolymerization Uneven distribution of 1-hexene in the
CN1194993A discloses a kind of catalyst that is used for ethylene slurry polymerization, and it is dissolved in the homogeneous solution of organic epoxy compound, organic phosphorus compound and inert solvent by magnesium chloride, then adds electron donor, a kind of co-diluent and transition metal titanium prepared from the chloride of ethylene, the catalyst can also be used for the copolymerization of ethylene and α-olefin, but there is no example of the copolymerization of ethylene and 1-hexene to form LLDPE

Method used

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  • Ethylene-alpha-olefin copolymerization catalyst and preparation and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a catalyst for the copolymerization of ethylene and α-olefin, which is prepared by the following steps:

[0042] (1) Add 1 g of anhydrous magnesium chloride, 30 ml of n-hexane and 3.75 ml of isobutanol into a three-neck flask replaced by argon, stir and heat to 70° C., and react for 3 hours to obtain a suspension.

[0043] (2) Add 0.10 ml of tributyl phosphate to the suspension, stir and react at 70° C. for 1.5 hours, then add 0.2 ml of tetraethoxysilane, and stir and react at 70° C. for 1.5 hours.

[0044] (3) Cool down to room temperature and slowly add 20 ml of titanium tetrachloride dropwise for 90 minutes; gradually raise the temperature to 70°C for 2 hours; then stir and react for 2 hours.

[0045] (4) Hydraulically filter the supernatant, add 25 ml of n-hexane, heat up to 70° C., add 0.20 ml of tetrahydrofuran, and stir for 1.5 hours.

[0046] (5) Then add 20 ml of titanium tetrachloride and react for 2 hours. After the reaction, it was...

Embodiment 2

[0049] The preparation method of the present embodiment ethylene and α-olefin copolymerization catalyst is the same as embodiment 1, the difference is:

[0050] The amount of isobutanol in step (1) is 4.3 milliliters.

[0051] In step (2), diethyl succinate was used instead of tributyl phosphate, and the amount used was 0.10 ml; hexyltrimethoxysilane was used instead of tetraethoxysilane, and the amount used was 0.25 ml.

[0052] In the step (3), the amount of titanium tetrachloride is 30 milliliters, the time for dropping is 2 hours, and the reaction time is 1 hour.

[0053] In step (4), the amount of tetrahydrofuran used is 0.35 milliliters, and the reaction time is 2 hours.

[0054] In the step (5), the consumption of titanium tetrachloride is 22 milliliters, and the reaction time is 3 hours.

[0055] The titanium content of the prepared solid catalyst 2 was 4.04wt%.

Embodiment 3

[0057] This embodiment provides a catalyst for the copolymerization of ethylene and α-olefin, the preparation method of which is the same as that of Example 1, except that:

[0058] The amount of isobutanol used in step (1) is 2.20 milliliters.

[0059] The amount of tributyl phosphate in step (2) is 0.20 ml; the amount of tetraethoxysilane is replaced by 3-chloropropyltriethoxysilane, and the amount is 0.22 ml.

[0060] In the step (3), the amount of titanium tetrachloride used is 16 milliliters, the dropwise addition time is 2 hours, and the reaction time is 1 hour.

[0061] In step (4), tetrahydrofuran was replaced with 2,2-dimethylpropane, and the dosage was 0.15 ml.

[0062] In the step (5), the consumption of titanium tetrachloride is 16 milliliters.

[0063] The titanium content of the prepared solid catalyst 3 was 4.10wt%.

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Abstract

The invention relates to an ethylene-alpha-olefin copolymerization catalyst and preparation and applications thereof. The ethylene-alpha-olefin copolymerization catalyst is prepared through the steps of dissolving a magnesium compound in a hydrocarbon solvent, adding an alcohol solvent, and reacting for 2-4 hours under the condition of stirring at a temperature of 70-90 DEG C; then, adding an electron donor I, reacting for 1-2 hours under the condition of stirring, adding an electron donor II, and reacting for 1-2 hours under the condition of stirring; cooling to room temperature, dropwise adding a titanium compound, completing the dropwise adding in 1-2 hours, heating to 70-90 DEG C, and reacting for 1-3 hours under the condition of stirring; carrying out filter pressing on a reaction product so as to remove the solvent, adding a hydrocarbon solvent, stirring, heating to 70-90 DEG C, adding an electron donor III, and reacting for 1-2 hours under the condition of stirring; adding a titanium compound, and reacting for 1-3 hours under the condition of stirring; and filtering, washing and drying the obtained product. The catalytic activity of the catalyst for catalyzing the copolymerization of ethylene and long-chain alpha-olefin is high, so that a prepared copolymer is high in long-chain alpha-olefin insertion rate, high in bulk density, and less in fine powder.

Description

technical field [0001] The invention relates to a catalyst for the copolymerization of ethylene and α-olefins and a preparation method thereof, in particular to an electron donor-modified Ziegler-Natta catalyst for the copolymerization of ethylene and long-chain α-olefins and a preparation method thereof, belonging to olefins The field of polymerization catalysts. Background technique [0002] Linear low-density polyethylene (LLDPE) is a copolymer of ethylene and α-olefin (1-butene, 4-methyl-1-pentene), and the macromolecule obtained after introducing α-olefin monomer into ethylene polymerization Contains a considerable number of branched chains, and these short and long branched chains will affect its physical properties; by adjusting the length of branched chains, degree of branching and comonomer content, products with required properties can be prepared, giving LLDPE Low temperature toughness, high modulus, bending resistance, puncture resistance, tear resistance, are w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F4/649C08F4/646C08F4/654C08F4/656
Inventor 米普科陈谦熊玉洁王斯晗许胜张宝军李贺刘敏蔡艳吴俊敏晁丽刘小飞
Owner BC P INC CHINA NAT PETROLEUM CORP
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