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Ethylene and 1-hexene copolymer and preparation method thereof

A kind of hexene copolymer, ethylene technology

Inactive Publication Date: 2021-01-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the interaction process between the nickel catalyst and its cocatalyst methylaluminoxane MAO has not been clearly elucidated due to the lack of clear evidence of the structure of the intermediate species.
Researchers can only make certain speculations about the changes in the metal active centers based on the phenomenon, and cannot obtain definite evidence to confirm the interaction process between the catalyst and the co-catalyst in the process of olefin polymerization

Method used

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  • Ethylene and 1-hexene copolymer and preparation method thereof
  • Ethylene and 1-hexene copolymer and preparation method thereof
  • Ethylene and 1-hexene copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After the polymerization reaction device has been anhydrous and oxygen-free, add 45.55mL toluene, 0.95Ml 1-hexene and 1mL MAO toluene solution with a concentration of 1.5mol / L to the polymerization reaction under the conditions of normal pressure ethylene atmosphere and 25°C water bath In the device, fully mix at a speed of 600r / min to fully dissolve ethylene in the toluene solvent, add 2.5mL of methylaluminoxane MAO cocatalyst toluene solution with a concentration of 0.001mol / L into the polymerization reaction device, and initiate the reaction And timing, when the reaction time reaches 30min, take 3mL of hydrochloric acid acidified ethanol solution (5wt%) to quench the polymerization reaction, and the polyethylene product is precipitated after the reaction is completed. The precipitated polyethylene product was washed with 95% ethanol for several times, put into a 40°C normal-pressure oven and a negative-pressure oven, and dried to a constant weight to obtain the final ...

Embodiment 2

[0032]After the polymerization reaction device has been anhydrous and oxygen-free, add 44.55mL of toluene, 0.95mL of 1-hexene and 2mL of MAO toluene solution with a concentration of 1.5mol / L to the polymerization reaction device under the conditions of normal pressure ethylene atmosphere and 25°C water bath 2.5 mL of methylalumoxane MAO cocatalyst toluene solution with a concentration of 0.001 mol / L was added to the polymerization reaction device to initiate the reaction and Timing, when the reaction time reaches 30min, take 3mL hydrochloric acid acidified ethanol solution (5wt%) to quench the polymerization reaction, and the polyethylene product is precipitated after the reaction is completed. The precipitated polyethylene product was washed with 95% ethanol for several times, put into a 40°C normal-pressure oven and a negative-pressure oven, and dried to a constant weight to obtain the final product.

Embodiment 3

[0034] After the polymerization reaction device has been anhydrous and oxygen-free, add 43.55 mL of toluene, 0.95 mL of 1-hexene and 3 mL of MAO toluene solution with a concentration of 1.5 mol / L to the polymerization reaction device under the conditions of normal pressure ethylene atmosphere and 25 °C water bath 2.5 mL of methylalumoxane MAO cocatalyst toluene solution with a concentration of 0.001 mol / L was added to the polymerization reaction device to initiate the reaction and Timing, when the reaction time reaches 30min, take 3mL hydrochloric acid acidified ethanol solution (5wt%) to quench the polymerization reaction, and the polyethylene product is precipitated after the reaction is completed. The precipitated polyethylene product was washed with 95% ethanol for several times, put into a 40°C normal-pressure oven and a negative-pressure oven, and dried to a constant weight to obtain the final product.

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Abstract

The invention discloses an ethylene and 1-hexene copolymer and a preparation method thereof. The copolymer poly(ethylene-co-1-hexene) is prepared by taking ethylene and 1hexene as comonomers and usingan alpha-diimine nickel catalyst and a methylaluminoxane MAO cocatalyst through a coordination polymerization method. The process for preparing the ethylene and 1-hexene copolymer is simple, the obtained poly(ethylene-co-1-hexene) has the characteristics of high molecular weight, low melting point, high branching degree and the like, the performance of a polymerization product can be regulated and controlled by controlling reaction conditions; by utilizing a chain walking catalyst, the polyolefin products with different performances are obtained in a coordination polymerization process of thecocatalyst MAO and an olefin monomer in a polymerization reaction system; in addition, the interaction between a nickel metal active center in the alpha-diimine nickel catalyst and MAO is clearer through an EPR map, and the valence state of the nickel metal center is reduced to different extents along with the change of the adding amount of the Lewis acid MAO.

Description

technical field [0001] The patent of the invention belongs to a copolymer and a preparation method thereof in the technical field of polymer materials, and specifically relates to a copolymer of ethylene and 1-hexene and a preparation method thereof. Background technique [0002] Polyolefin products have always been an important class of polymer products. Plays an important role in the polymer system. Its products can be seen everywhere in our daily life. It is also widely used in packaging, electronics and other fields in industrial applications. According to reports, in the next period of time, the world's polyolefin products will still be in a stage of rapid growth. [0003] At present, metallocene catalytic systems are mainly used in the preparation process of industrialized polyolefin products. High stability and high catalytic activity make metallocene catalyzed ethylene widely used in olefin polymerization process. With the continuous development of the system, B...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F210/14C08F4/70
CPCC08F210/16C08F210/14C08F2500/01C08F4/7098
Inventor 俞豪杰王立邢煜生
Owner ZHEJIANG UNIV
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