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Improved (alpha-diimine) nickel catalyst as well as preparation method and application thereof

A nickel catalyst and catalyst technology, applied in the direction of chemical instruments and methods, nickel organic compounds, compounds containing elements of group 8/9/10/18 of the periodic table, etc., can solve the problem of the decrease of the branching degree of branched polyethylene and the inability to Ideally improve the overall performance and elastic weakening of branched polyethylene elastic materials, and achieve the effect of comprehensive performance improvement

Active Publication Date: 2021-09-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves on certain properties such as mechanical strength or flexibility when mixed together different types of chemicals like BBr3 (bicyclo[exane), PEA (polymers containing repeating units) or other compounds called initiators that help make plastomeric materials stronger without losing their shape overtime. By mixing these two components correctly, this new material becomes better able to resist deformation during use compared to traditional methods where each component was separately added individually.

Problems solved by technology

This patented problem addressed by our patents relates to improving the quality of polypolyvinylidene(PVL), which has become important due to their wide use across industries like automobile manufacturing, building construction, medical devices, etc., particularly when they come into contact with water during prolonged exposures over long periods of time. These types of plastic products made through PVD processes often lose some tensile force before reaching end users. To solve these issues, there needs to develop improved catalyst technologies capable of producing higher levels of macromonomery polyoxymethylstyrenes (PMMS).

Method used

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  • Improved (alpha-diimine) nickel catalyst as well as preparation method and application thereof
  • Improved (alpha-diimine) nickel catalyst as well as preparation method and application thereof
  • Improved (alpha-diimine) nickel catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1 prepares ligand compound C4

[0051] In the 50mL pear-shaped bottle, add 0.17gZnCl 2, 0.2g of compound C3, 15mL of glacial acetic acid and 0.64g of 4-bromo-2,6-diisopropylaniline were stirred and refluxed at 120°C for 3h, and a solid precipitated out. Cool to room temperature, filter, wash with acetic acid three times, remove acetic acid with ether, and finally dissolve the solid with dichloromethane, add potassium oxalate to the solution, and stir for 15 minutes. After stirring, pour the solution into a separatory funnel, oscillate and let it stand, the lower organic phase liquid is released from below, the upper layer liquid is washed with water three times, then the organic phase liquid is lowered, and the upper layer waste liquid is poured out. Add MgSO to the organic phase liquid 4 Dry and stir for 15 minutes until clear. Finally, after the solution was rotary evaporated, it was placed in a ligand oven and sucked dry for one day to obtain a crude C4...

Embodiment 2

[0053] Embodiment 2 prepares catalyst Cat-B

[0054] Weigh 0.126g (DME)NiBr from the glove box 2 Put it in a 100mL pear-shaped bottle, dissolve it with 10mL of refluxing dichloromethane, then weigh 0.305g of ligand C4 and dissolve it with 10mL of dichloromethane and inject it into the pear-shaped bottle through long needle injection. The reaction was stirred at 25° C. for 24 hours, then the dichloromethane was sucked dry, the solid was washed 4 times with 25 mL of ether, and the ether was drained to obtain 0.19 g of a reddish-brown powder solid with a yield of 41.5%.

[0055] The stretching vibration absorption peak of the C=N double bond before and after complexation changes from 1629cm -1 and 1665cm -1 It becomes 1611cm -1 and 1646cm -1 , moving to the low wave number direction, indicating that a coordination effect has occurred between the N atom and the Ni atom, and the catalyst is successfully complexed.

Embodiment 3

[0056] Embodiment 3 prepares the single crystal of Cat-B

[0057] Add diethyl ether dropwise to the saturated dichloromethane solution of Cat-B, the ratio of dichloromethane to diethyl ether is about 1:5, let it stand for diffusion, and when the single crystal of Cat-B is clearly observed, select a suitable size Cat -B single crystal structure determination, the obtained measurement results are as follows figure 2 shown.

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PUM

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Abstract

The invention relates to the field of olefin catalytic polymerization, and aims to provide an improved (alpha-diimine) nickel catalyst as well as a preparation method and application thereof. The chemical structural formula of the (alpha-diimine) nickel olefin catalyst is shown as a formula (II), in the formula, R1 is alkyl, and R2 is halogen. The preparation method of the catalyst Cat-B comprises the following steps: carrying out diacylation reaction on acenaphthene to obtain a compound C1; subjecting the C1 and N-bromosuccinimide to a bromination reaction to obtain C2; carrying out elimination reaction on the C2 to obtain C3; subjecting the C3 and symmetrical aniline to a ketoamine condensation reaction so as to obtain the alpha-diimine ligand C4; and carrying out complexing on the C4 and ethylene glycol dimethyl ether nickel dibromide to obtain the catalyst Cat-B. Compared with existing catalysts, the branched polyethylene obtained by catalyzing ethylene polymerization under the same condition can be simultaneously improved in terms of branching degree and molecular weight, the comprehensive performance of the branched polyethylene in the aspects of strength and elasticity can be improved, and the application scene of the branched polyethylene in the aspect of rubber products is expanded.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV
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