Ti-Ni match as composite catalyst and its application in preparing branch polyethylene from ethylene

A technology of composite catalyst and nickel complex, which is applied in the field of titanium-nickel complex composite catalyst, can solve the problems of complex catalyst preparation, difficulty in popularization and use, and irregular product shape, and achieve good particle shape, polymerization reaction control, and polymerization reaction. easy effect

Inactive Publication Date: 2002-08-14
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of this new type of catalyst is relatively complicated, and expensive MAO or boron compounds need to be used as cocatalysts, and the shape of the obtained product is irregular.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Catalyst preparation:

[0024] 1-1: 10 g of microspherical SiO 2 (pore volume 1.5 ~ 2.0ml / g) in a tube furnace, through N 2 , heated to 600°C, dehydrated at constant temperature, and removed most of the bound hydroxyl groups. After cooling for 4 hours, the N 2 Discharge under protection, be placed in reaction bottle; Add 90ml heptane, under N 2 Under protection and stirring, add 2.5molAlEt 3 / L concentration of ZnCl 2 -AlEt 3 Hexane solution 5ml, maintain at 25-50°C for 30 minutes, vacuum-dry to remove heptane, and obtain pretreated SiO 2 .

[0025] 1-2: anhydrous MgCl 20.7g was placed in a reaction bottle and dissolved in 30ml THF and 1.5ml C 2 h 5 OH, heated to 70°C and stirred until completely dissolved to obtain the mother liquor: in N 2 Under protection, add 1-1 to prepare pretreated SiO 2 , react at 50-60°C for 2 hours; remove THF at a vacuum of 30-50kpa to only contain THF as 0.10-0.15 parts of the total weight of the active carrier, and obtain MgC...

Embodiment 2

[0032] In embodiment 1 step 1-2, after making mother liquor, add 0.2ml Ti(OBu) again 4 and pretreated SiO 2 Reaction, all the other conditions and operation are the same as embodiment one, and the prepared catalyst is polymerized under the same conditions. Under the above conditions, a low density polyethylene with a branching degree of 7.0, a density of 0.922 and a melting point of 123°C was obtained from a single ethylene polymerization. The catalytic efficiency is 6.5×10 4 gPE / mol(Ni+Ti·h).

Embodiment 3

[0034] With the 1.5gNiX in embodiment 1 step 1-4 2 L 1 Instead, use 1.0g NiX 2 L 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.

[0035] Under the above conditions, from a single ethylene polymerization, a polyethylene with a branching degree of 3.0 and a density of 0.935 was obtained, with a melting point of 126.3°C; its catalytic efficiency was 1.6×10 5 gPE / mol(Ni+Ti) h.

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Abstract

A catalyst for preparing branched polyethylene from ethylene is composed of main catalyst prepared by carrying Ti compoud-Ni compound on the MgCl2 ZnCl2, or SiO2 and the co-catalyst which is composite alkylaluminium (AlEt2Cl-AlR3). It is prepared by dipping reaction.

Description

technical field [0001] The invention relates to a titanium-nickel complex composite catalyst and a method for preparing various branched polyethylenes from single ethylene. Background technique [0002] As we all know, traditional Ziegler-Natta (Z-N) catalysts can only produce branched polyethylenes with different densities from the copolymerization of ethylene and α-olefins; it is difficult to prepare branched polyethylenes with different densities from a single ethylene. It is reported in the literature that the catalytic system prepared by using the diimine complexes of late transition metals Ni, Pd, etc. and methylaluminoxane (MAO) or boron compounds can synthesize various branched polyethylenes from a single ethylene. However, the preparation of this new type of catalyst is relatively complicated, and expensive MAO or boron compounds need to be used as co-catalysts. The shape of the obtained product is irregular, and it is still difficult t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/80C08F10/02
Inventor 王海华林少全萧翼之张启兴
Owner SUN YAT SEN UNIV
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