Multinuclear acenaphthene diimine nickle catalyst for synthesis of branched polyethylene

A technology of nuclear acenaphthylene diimide nickel chloride and branched polyethylene is applied in the field of polynuclear acenaphthylene diimide nickel chloride complex catalyst and its preparation field, and can solve the problems of irregular product shape, difficulty in promotion and use, and high cost , to achieve significant advantages and the effect of promoting the use of

Inactive Publication Date: 2005-02-23
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this catalyst needs to use expensive MAO or boron compound as a cocatalyst, and the cost is high; and the degree of branching of the obtained product is not easy to control, and the shape of the product is irregular. difficulty

Method used

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  • Multinuclear acenaphthene diimine nickle catalyst for synthesis of branched polyethylene
  • Multinuclear acenaphthene diimine nickle catalyst for synthesis of branched polyethylene
  • Multinuclear acenaphthene diimine nickle catalyst for synthesis of branched polyethylene

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Experimental program
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Effect test

Embodiment 1

[0026] 1. Nickel complex (Ni) n+2 L 1 Cl 2(n+2) Preparation of polynuclear acenaphthylenediimide nickel complex can be obtained by the following method: under the protection of nitrogen, dissolve 0.5354g (4.14mmol) anhydrous nickel chloride in 20ml absolute ethanol for 2 to 3 hours, and after the dissolution , was added to dissolve 2.005g (4.14mmol) ligand L 1 30 g CH 2 Cl 2 solution, reflux reaction for 12 to 16 hours, drained to remove the solvent, washed three times with 30ml of anhydrous ether, and dried in vacuum to obtain the desired nickel complex (Ni) n+2 L 1 Cl 2(n+2) .

[0027] 2. Catalyst preparation:

[0028] 2-1. Mix 5 g of microspherical SiO 2 Put it in a tube furnace, heat it under nitrogen, raise the temperature to 600°C, calcine and dehydrate at a constant temperature, cool after 6 hours, and discharge under nitrogen protection to obtain 4 grams of SiO 2 , placed in a reaction flask, add 40ml of heptane, under nitrogen protection and constant stirrin...

Embodiment 2

[0037] 1. In Step 1 of Example 1, 4.14 mmol of ligand L 1 Change to 4.14mmol ligand L 2 , and the rest of the reaction conditions are the same, the complex (Ni) n+2 L 2 Cl 2(n+2) .

[0038] 2. In embodiment one step 2-4, will add 1.624g nickel complex (Ni) n+2 L 1 Cl 2(n+2) CH 2 Cl 2 solution, add 1.486g (Ni) instead n+2 L 2 Cl 2(n+2) CH 2 Cl 2 solution, all the other conditions and operations are the same as in Example One, and the prepared catalyst is polymerized under the same conditions as in Example One.

[0039] The density of the obtained branched polyethylene under the above polymerization conditions is 0.894g / cm 3 , The degree of branching is 68.0 elastomer. The catalytic efficiency of the catalyst is 65kgLLDPE / molNi.

Embodiment 3

[0041] 1. In Step 1 of Example 1, 2.005g (4.14mmol) of ligand L 1 Change to 1.788 (4.14mmol) Ligand L 3 , and the rest of the reaction conditions are the same, the complex (Ni) n+2 L 3 Cl 2(n+2) .

[0042] 2. In embodiment one step 2-4, 1.624g nickel complex (Ni) n+2 L 1 Cl 2(n+2) Change to 1.577g(Ni) n+2 L 3 Cl 2(n+2) , all the other conditions and operations are the same as in Example 1, and the prepared catalyst is polymerized under the same conditions as in Example 1.

[0043] The density of the branched polyethylene prepared under the above polymerization conditions is 0.887g / cm 3 , The degree of branching is 50.2 elastomers. The catalytic efficiency of the catalyst is 65kgLLDPE / molNi.

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Abstract

This invention refers to multinuclear acenaphthene diimine nickel chloride catalyst for synthesizing branched polyvinyl. The main catalyst is carrying the multinuclear acenaphthene diimine nickel coordinated compound on SiO2-MgCl composited carrier, and AlEt2Cl is aided catalyst. The preparation is immersing reaction. The products are sphericity granules, without MAO catalyzing single polyvinyl to polymerize, to obtain the high branching degree, low density, plastic and elastic polymers.

Description

technical field [0001] The invention relates to a polynuclear acenaphthylenediimide nickel chloride complex catalyst for synthesizing branched polyethylene plastomers and elastomers and a preparation method thereof. Background technique [0002] The traditional Ziegler-Natta (Z-N) catalyst has good catalytic activity for the copolymerization of ethylene and α-olefin, and can produce medium and low density polyethylene with different degrees of branching; but it cannot make polyethylene produce Branching, to obtain branched polyethylene, it is necessary to use expensive α-olefins, which increases the cost of polyethylene, and at the same time, it is not easy to obtain polyethylene with a high degree of branching with this type of catalyst. The diimine complexes of late transition metal nickel and palladium discovered in the mid-1990s can be synthesized from a single ethylene oligomerization and in-situ copolymerization in a catalytic system made of methylaluminoxane (MAO) or ...

Claims

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Application Information

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IPC IPC(8): C08F4/70C08F10/02
Inventor 王海华胡扬剑江洪流
Owner SUN YAT SEN UNIV
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