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Polyethylene and preparation method thereof

A polyethylene and copolymer technology, applied in the field of polyethylene and its preparation, can solve the problem of insufficient branching degree and achieve the effect of mild reaction conditions

Pending Publication Date: 2020-12-15
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the degree of branching in the prior art is not high enough, the present invention proposes a new polyethylene and its preparation method, which can greatly increase the degree of branching of polyethylene, and the reaction is mild, suitable for industrial production

Method used

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  • Polyethylene and preparation method thereof
  • Polyethylene and preparation method thereof
  • Polyethylene and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add the ethylene raw material into a 500ml reaction kettle with a stirring device, a temperature control system, a pressure control system, and a feeding system (make sure the reaction system is in an anhydrous and oxygen-free environment before use), maintain the pressure at 0.1MPa, and control the temperature at 50°C , successively add cocatalyst 0.7mmolMAO (Al / Ni=75), the toluene solution 5μmol (concentration 0.1mmol / L) of main catalyst formula (1) adjusts the ethylene pressure in the reactor to the required polymerization pressure 0.4MPa, starts the polymerization reaction. The polymerization reaction was terminated after 4 h, and the obtained polymer solution was deactivated with a volume fraction of 5% hydrochloric acid / ethanol solution (the volume ratio of hydrochloric acid to ethanol was 5%, and the concentration of hydrochloric acid was 1 mol / L) to deactivate the catalyst and remove the solvent, The obtained polymer was placed in a vacuum drying oven at 60°C and...

Embodiment 2

[0027] The polymerization conditions were the same as those in Example 1, except that MMAO was replaced by MAO. Obtained branched polyethylene product 21.5g, catalyst activity 4.3x10 6 g / (mol Ni·h).

[0028] Using 1,2,4-trichlorobenzene as a solvent, the Mw of the product was 23.92x10 tested by high temperature gel chromatography-Fourier infrared spectroscopy at 150℃. 4 g / mol with a branch content of 123.4 CH 3 / 1000C. Take a 50mg sample and analyze it with analytical TREF. The analysis result shows that the mass fraction of the elution component within 40°C is 62.16%, and the density is 0.891g / cm 3 .

Embodiment 3

[0030] The polymerization conditions are the same as in Example 1, except that MMAO is only replaced by MAO, and the polymerization pressure is controlled to be 1.5MPa to obtain 25.5g of branched polyethylene products, and the catalyst activity is 5.1×10. 6 g / (mol Ni·h). Using 1,2,4-trichlorobenzene as a solvent, the Mw of the product was 28.35x10 tested by high temperature gel chromatography-Fourier infrared spectroscopy at 150°C. 4 g / mol, the branched chain content is 152.7 CH 3 / 1000C. Take 50 mg of sample and analyze it with analytical TREF. The analysis result shows that the mass fraction of elution components within 40°C is 68.41%, and the density is 0.889g / cm 3 .

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Abstract

The invention belongs to the field of olefin catalytic polymerization, and particularly relates to polyethylene and a preparation method thereof, and the branching degree of polypropylene is 53-219 methyl groups per 1000 carbon atoms. The preparation method comprises the following steps: 1) adding a pure ethylene raw material into a reaction kettle, and enabling the pressure in the reaction kettleto reach 0.1-1.5 MPa; 2) controlling the temperature in the reaction kettle to be 20-150 DEG C, sequentially adding a co-catalyst and a main catalyst solution into the reaction kettle, adjusting thepressure in the reaction kettle to be 0.1-2.0 MPa, and starting polymerization reaction; 3) after the polymerization reaction is finished, deactivating the catalyst in the polymer solution by using anethanol acidic solution, and removing the solvent from the polymer solution to obtain a polymer; and 4) drying the obtained polymer in a vacuum drying oven at 60 + / -2 DEG C until the weight is constant, thereby obtaining polyethylene. The branched chain of polyethylene can reach 219 methyl groups / 1000 carbon at most, the activity of the main catalyst in the preparation method of the branched polyethylene is not less than 1.08*10<6> g / (molNi.h), no second co-monomer is added in the preparation process, the reaction conditions are mild, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of olefin catalytic polymerization, in particular to a polyethylene and a preparation method thereof. Background technique [0002] At present, the preparation of hyperbranched polyethylene by selecting special catalysts and reaction conditions with ethylene as the only raw material has become a research hotspot in the industry. In the structure of polyethylene, the level of branched chain content has a very significant impact on the crystal morphology of the final product. This effect is mainly due to that with the increase of the number of branches, the distance between the branches becomes shorter, resulting in a decrease in the length of the crystalline segment, which changes the morphology. With the increase of branching degree, the crystalline sheet becomes thinner, the melting temperature decreases, and the glass transition temperature decreases. Hyperbranched polyethylene is an elastomer at room temperature, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/70
CPCC08F110/02C08F4/7006
Inventor 柴子斌徐永业明军郭换如
Owner SINOPEC YANGZI PETROCHEM
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