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Method for preparing ethylene copolymer

A technology for the polymerization of ethylene copolymers and olefins, which is applied in the field of preparation of ethylene copolymers, can solve problems such as complex catalyst preparation processes, and achieve the effects of low cost, easy industrialization, and good repeatability

Active Publication Date: 2019-09-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this catalyst is relatively complicated, and the yield is only about 70%

Method used

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  • Method for preparing ethylene copolymer
  • Method for preparing ethylene copolymer
  • Method for preparing ethylene copolymer

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preparation example Construction

[0017] The present invention provides a method for preparing ethylene copolymer, wherein the method comprises: under olefin polymerization conditions, in the presence of an inert solvent, contacting ethylene, a comonomer and a catalyst, wherein the catalyst contains the formula ( I) post-metallocene catalyst precursors, borides and alkylaluminum compounds based on diacetylenylphenols,

[0018]

[0019] In formula (I), R 1 for hydrogen, C 1 -C 20 straight-chain or branched-chain alkyl or trimethylsilyl; R 2 for hydrogen, C 1 -C 20 straight-chain or branched-chain alkyl or phenyl; R 3 , R 4 , R 5 , R 6 and R 7 for hydrogen or C 1 -C 20 straight-chain or branched-chain alkyl; M is one of titanium, zirconium and hafnium; X 1 and x 2 The same or different, each independently halogen.

[0020] Among them, the C 1 -C 20 Specific examples of straight-chain or branched-chain alkyl groups may include, but are not limited to: methyl, ethyl, n-propyl, isopropyl, n-butyl...

preparation example 1

[0064] This preparation example is used to illustrate the preparation of the post-metallocene catalyst precursor with the structure represented by formula (II).

[0065] Dissolve 4-tert-butyl-2,6-bis(trimethylsilylacetylene)phenol (3.00mmol) in 30mL ether solvent, add n-hexane containing n-butyllithium to the solution at -78°C The solution (the concentration of n-butyllithium in the n-hexane solution is 1.67M, and the amount of n-butyllithium used is 3.00mmol) was reacted for 1 hour, returned to 25° C., and continued to react for 15 minutes. A compound having a structure represented by formula (VII) is obtained.

[0066]

[0067] At -78 ° C, the solution of the compound containing the structure shown in the formula (VII) obtained above was transferred to the titanium metal complex (3.00 mmol) containing the cyclopentadienyl group of the structure shown in the formula (VIII) through a double angle needle in ether solution (the amount of ether used is 30 mL), and reacted at ...

preparation example 2

[0072] This preparation example is used to illustrate the preparation of the post-metallocene catalyst precursor with the structure represented by formula (II).

[0073] Dissolve 4-tert-butyl-2,6-bis(trimethylsilylacetylene)phenol (3.00mmol) in 30mL of dichloromethane solvent, and add n-butyllithium to the solution at -78°C n-hexane solution (the concentration of n-butyllithium in the n-hexane solution is 1.67M, the amount of n-butyllithium used is 3.00mmol) and then reacted for 1 hour, returned to 20°C, and continued to react for 15 minutes. A compound having a structure represented by formula (VII) is obtained.

[0074] At -78°C, the solution of the compound containing the structure shown in the formula (VII) obtained above was transferred to the titanium metal complex (3.00 mmol) containing the cyclopentadienyl group of the structure shown in the formula (VIII) through a double angle needle in dichloromethane solution (the amount of dichloromethane used is 30 mL), and reac...

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Abstract

The invention relates to the field of olefin coordination polymerization, and discloses a method for preparing an ethylene copolymer. The method is characterized in that ethylene, a comonomer and a catalyst are contacted under an olefin polymerization condition in the presence of an inert solvent; the catalyst contains a dialkynylphenol-based post-metallocene catalyst precursor represented by formula (I), a boride, and an alkylaluminum compound; and in the formula (I), R1 is hydrogen, a C1-C20 linear or branched alkyl group or a trimethylsilyl group, R2 is hydrogen, a C1-C20 linear or branched alkyl group or a phenyl group, R3, R4, R5, R6 and R7 are hydrogen or a C1-C20 linear or branched alkyl group, M is one of titanium, zirconium and hafnium, and X1 and X2 can be same to or different from each other, and respectively independently are halogens. The ethylene copolymer prepared by the method has a high catalytic efficiency, the introduction proportion of the comonomer is high, and the preparation process of the post-metallocene catalyst precursor is simple.

Description

technical field [0001] The invention relates to the field of olefin coordination polymerization, in particular to a preparation method of an ethylene copolymer. Background technique [0002] Since the beginning of the 21st century, with the improvement of the national economy and the needs of the national defense industry, polymer materials, especially polyolefin materials, have played an increasingly important role: due to the abundance and low cost of polyolefin raw materials, easy processing and molding, every year in the world The polyolefin products produced within the scope exceed 100 million tons, becoming one of the largest industries; polyolefin materials have relatively small density, good chemical resistance, water resistance, good mechanical strength, electrical insulation, etc. Features, can be used for films, pipes, plates, various shaped products, wires and cables, etc., not only widely used in agriculture, packaging, automobiles, electrical appliances and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/14C08F4/6592C08F2/06
CPCC08F210/14C08F210/16C08F2420/04C08F4/6592C08F2/06
Inventor 韩书亮吴宁郝建国陈淑明徐林王超
Owner CHINA PETROLEUM & CHEM CORP
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