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 deg

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

Examples

Experimental program
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Example Embodiment

[0025] Example one:

[0026] 1. Nickel complex (Ni) n+2 L 1 Cl 2(n+2) Preparation: The polynuclear acenaphthylene diimide nickel complex can be obtained by the following method: under the protection of nitrogen, 0.5354g (4.14mmol) of anhydrous nickel chloride is dissolved in 20ml of absolute ethanol for 2 to 3 hours, and after the dissolution is complete , Added to the dissolved 2.005g (4.14mmol) ligand L 1 Of 30 g CH 2 Cl 2 In the solution, reflux and react for 12-16 hours, drain to remove the solvent, wash with 30ml of anhydrous ether three times, and dry in vacuum to obtain the desired nickel complex (Ni) n+2 L 1 Cl 2(n+2) .

[0027] 2. Catalyst preparation:

[0028] 2-1. Put 5 grams of micro spherical SiO 2 Place in a tube furnace, heat under nitrogen, heat up to 600℃, calcine at constant temperature for dehydration, cool after 6 hours, and discharge under the protection of nitrogen to obtain 4 grams of SiO 2 , Put in the reaction flask, add 40ml heptane, under the protection ...

Example Embodiment

[0036] Embodiment two:

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

[0038] 2. In steps 2-4 of Example 1, 1.624g of nickel complex (Ni) will be added 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 The solution, other conditions and operations were the same as in Example 1, and the prepared catalyst was polymerized under the same conditions as in Example 1.

[0039] The density of branched polyethylene obtained 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.

Example Embodiment

[0040] Embodiment three:

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

[0042] 2. In steps 2-4 of Example 1, 1.624g of nickel complex (Ni) n+2 L 1 Cl 2(n+2) Change to 1.577g (Ni) n+2 L 3 Cl 2(n+2) The rest of the 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 branched polyethylene prepared under the above polymerization conditions is 0.887g / cm 3 , The degree of branching is 50.2 elastomer. 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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