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Ethylene polymerizing titanium-nickel-salicy-alimine composite catalyst and its preparing method

A technology of salicylaldimine and composite catalyst, which is applied in the field of titanium-nickel-salicylaldimine composite catalyst and its preparation, can solve the problems of irregular product shape, unfavorable promotion and use, and low bulk specific gravity, and achieve excellent comprehensive performance and remarkable The effect of superiority and simple preparation method

Inactive Publication Date: 2003-01-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of this kind of catalyst is relatively complicated, and expensive MAO or boron compound needs to be used as a cocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] 1. Catalyst Preparation

[0026] 1-1 Add 1.0gNiCl 2 Dissolve in 20ml 95% ethanol, add 3.0g SiO 2 , stirred and reacted at 35-40°C for 1 hour, and dried the solvent at 60-80°C to obtain a solid powder, which was passed through N 2 , heat up and dehydrate, heat up to 600°C for 6 hours, then cool down, under N 2 The material discharged under protection is placed in a reaction bottle.

[0027] 1-2 will anhydrous MgCl 2 0.3g was placed in another reaction flask, added into 12ml THF and 0.55ml absolute ethanol, heated to 60-75°C and stirred for 2 hours until completely dissolved to obtain the mother liquor.

[0028] 1-3 in N 2 Under the protection of 1-1 prepared pretreated SiO 2 Add 1-2 to the prepared mother liquor, then add 1.0g S 1 8ml of THF solution, stirred at 65-70°C for 2 hours, and drained the solvent at 65-80°C.

[0029] 1-4 Add 20ml of hexane to the product of 1-3, and add 0.25ml of TiCl under stirring 4 , Stir and react at 65-70°C for 2 hours, filter, a...

Embodiment 2

[0035] Add 1.0g S 1 The 8ml THF solution was changed to a solution containing 1.5g S 2 12ml THF solution, its condition and operation are prepared catalyst with embodiment one, by the polymerization reaction under the same conditions of embodiment one.

[0036] Under the above conditions, a branched polyethylene with a branching degree of 13.1, a density of 0.915, and a bulk specific gravity of 0.38 was obtained from a single ethylene polymerization, and the catalytic efficiency was 3.3 kg PE / g (Ti+Ni).

Embodiment 3

[0038] Add 1.0g S 1 The 8ml THF solution was changed to a solution containing 2.0g S 3 12ml THF solution, all the other conditions and operations are the same as the catalyst prepared in Example 1, and the polymerization reaction is carried out under the same conditions as in Example 1.

[0039] Under the above conditions, a branched polyethylene with a branching degree of 6.0, a density of 0.925, and a bulk specific gravity of 0.37 was obtained from a single ethylene polymerization, and the catalytic efficiency was 2.6 kg PE / g (Ti+Ni).

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Abstract

The present invention relates to a composite titanium-nickel-salicylamine catalyst for ethylene polymerization and its preparation. Titanium, nickel and salicylamine are carried on composite MgCl2-SiO2 carrier to consitute the main catalyst, AlR3-Et2AlCl is used as cocatalyst, and through soaking reaction process spherical composite catalyst system is prepared. The catalyst system is used in ethylene polymerization without needing MAO catalysis and can result in branched polyethyleen with good granular shape, high bulk specific weight and various density. The present process is simple and easy to use in production.

Description

technical field [0001] The invention relates to a titanium-nickel-salicylaldimine composite catalyst for preparing branched polyethylene with various densities with good particle shape and high bulk specific gravity from single ethylene and a preparation method thereof. Background technique [0002] For a long time, chemists have tried to research and develop a new type of branched polyethylene catalyst that can be used for the polymerization of single ethylene to prepare various densities with good particle shape and high bulk specific gravity. Recently, it has been reported in the literature that a variety of branched polyethylenes can be prepared from a single ethylene by using diimine complexes of late transition metals Ni, Pd, etc. and methylaluminoxane (MAO) or boron compounds as catalysts, which has attracted widespread attention (K. Johnson, C.M. Killian and M. Brookhart, J Am Chem Soc, 1995, 117:6414). The preparation of this kin...

Claims

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Application Information

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IPC IPC(8): C08F4/70C08F10/02C08F110/02
Inventor 王海华萧翼之张启兴薛行华
Owner SUN YAT SEN UNIV
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