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Preparation method of polyethylene

A polyethylene and styrene-based technology, applied in the field of olefin polymerization, can solve the problems of poor polymer film strength and achieve long half-life and high activity

Active Publication Date: 2016-07-27
HANGZHOU SHUANGAN SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this physically coated polymer film has poor strength

Method used

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  • Preparation method of polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: The preparation method of polyethylene, the steps are as follows: 1) In the porous carrier and according to the pore volume of the porous carrier, add a mixture of styrene monomer, comonomer and azobisisobutyronitrile to make the mixture in Immerse in the porous carrier for 14h at a temperature of 15℃;

[0034] 2) Heating styrene monomer, comonomer and azobisisobutyronitrile to react to obtain a styrene-based polymer, and obtain a porous carrier with pores filled with styrene-based polymer; then add polyethylene catalyst and stir for 12h, The polyethylene catalyst is fully supported in the porous carrier filled with styrene-based polymer to obtain a heterogeneous catalyst precursor;

[0035] 3) Wash the heterogeneous catalyst precursor prepared in step 2) several times with a solvent to remove the styrene-based polymer that is not adsorbed on the porous support; heat to 90°C and keep it for 13 hours to make the styrene-based polymer Cross-linking; finally, drying...

Embodiment 2

[0049] Example 2: The preparation method of polyethylene, the steps are as follows: 1) In the porous carrier and according to the pore volume of the porous carrier, add a mixture of styrene monomer, comonomer and azobisisobutyronitrile to make the mixture in Immerse in the porous carrier for 8h at a temperature of 5℃;

[0050] 2) Heating styrene monomer, comonomer and azobisisobutyronitrile to react to obtain a styrene-based polymer, and obtain a porous carrier with pores filled with styrene-based polymer; then add polyethylene catalyst and stir for 3h, The polyethylene catalyst is fully supported in the porous carrier filled with styrene-based polymer to obtain a heterogeneous catalyst precursor;

[0051] 1) Wash the heterogeneous catalyst precursor prepared in step 2) several times with a solvent to remove the styrene-based polymer that is not adsorbed on the porous support; heat to 70°C and keep it for 3 hours to make the styrene-based polymer Cross-linking; finally, drying to ...

Embodiment 3

[0059] Example 3: The preparation method of polyethylene, the steps are as follows: 1) In the porous carrier and according to the pore volume of the porous carrier, add a mixture of styrene monomer, comonomer and azobisisobutyronitrile to make the mixture in Immerse in the porous carrier for 24h at a temperature of 30℃;

[0060] 2) Heat the styrene monomer, comonomer and azobisisobutyronitrile to react to obtain a styrene-based polymer, and obtain a porous carrier whose pores are filled with styrene-based polymer; then add polyethylene catalyst and stir for 24h, The polyethylene catalyst is fully supported in the porous carrier filled with styrene-based polymer to obtain a heterogeneous catalyst precursor;

[0061] 1) Wash the heterogeneous catalyst precursor prepared in step 2) several times with a solvent to remove the styrene-based polymer that is not adsorbed on the porous support; heat to 120°C and keep it for 24 hours to make the styrene-based polymer Cross-linking; finally,...

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Abstract

The invention discloses a preparation method of polyethylene. The preparation method has the advantages that by an in-situ free radical polymerization method of styrene in a porous carrier, the styrene, polymerization monomers and initiator are diffused into the carrier before the polymerization is initiated; the porous carrier with the ducts being evenly filled with styryl polymer can be obtained, the catalyst is loaded further, then heating is performed to allow the styryl polymer in the ducts to crosslink, and the polyethylene product with high catalyst activity, long half-life period and product bulk density larger than 320g / cm<3> is obtained through the mass transfer resistance control of the styryl polymer to vinyl monomers, the high mechanical strength of the porous organic carrier and the swelling behaviors of the styryl polymer in the limited ducts.

Description

Technical field [0001] The invention relates to an olefin polymerization reaction process, in particular to a preparation method of a heterogeneous catalyst and a preparation method of polyethylene. Background technique [0002] The heterogeneous catalyst can avoid fouling on the reactor wall during the polymerization process, and obtain a polyolefin product with good shape and high bulk density, which can be directly put into use in existing equipment, which is one of the important directions of catalyst development. Currently, about 70% of industrial polyethylene is produced by heterogeneous catalysts. Due to the intrinsic kinetics of the active center of the catalyst, heterogeneous catalysts often exhibit different kinetic behaviors. In the future, transition metal iron-based catalysts, metallocene catalysts, and FI catalysts are taken as examples. The catalyst activity is usually released quickly 30 minutes before polymerization, and then rapidly decays. The half-life of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/02
CPCC08F110/02C08F4/027C08F2500/07
Inventor 历伟杨华琴张晶晶惠磊
Owner HANGZHOU SHUANGAN SCI TECH