Ethylene slurry ring tube polymerization or copolymerization method

A technology of copolymerization and ethylene, which is applied in the field of slurry loop copolymerization of ethylene and α-olefin, which can solve the problems of unsatisfactory polymer density and achieve the effect of good particle shape, reduced usage, and firm and broken

Active Publication Date: 2005-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Disclosed in Chinese patent CN1081684A is a method for preparing low-density polyethylene using a titanium-containing catalyst. Although the resulting polymer has good impact strength and narrow molecular weight distribution, the density of the polymer is still unsatisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Synthesis of catalyst

[0034] In the reactor fully replaced by high-purity nitrogen, 2.4g of magnesium dichloride, 40ml of toluene treated with molecular sieves, 3.9ml of epichlorohydrin, and 4.1ml of tributyl phosphate were added in sequence, and the temperature was raised to 80°C under stirring. After 2 hours, the solid had completely dissolved to form a homogeneous solution. Add 0.3ml of ethanol and 0.8ml of isooctyl alcohol, and react at 80°C for 1 hour. Add 30ml of dehydrated hexane and 2.3g of silica gel, cool the system to 0°C, slowly add 8ml of titanium tetrachloride dropwise, then slowly raise the temperature to 80°C, react for 2 hours, add 5ml of tetrahydrofuran, at 80°C The reaction was continued for 1 hour. Stop stirring, let it stand, the suspension will be separated quickly, remove the upper clear night, wash with hexane four times, add 1.8ml of 2.2mol / l diethylaluminum chloride, react at 50°C for 30min, add 1.5mol / l l 1.2ml of tri-n-hexylaluminum ...

Embodiment 2

[0038] (1) The synthesis of catalyst is the same as in Example 1.

[0039] (2) Ethylene copolymerization

[0040] Use N for the φ150×3000 loop reactor 2 After full replacement, add 6.0 L of hexene, 2.0 mmol / l of triethylaluminum, use isobutane as diluent, 0.6 g of the above solid catalyst, raise the temperature to 75°C, and feed ethylene / hydrogen mixed gas with a hydrogen concentration of 38 %. The reaction pressure is 2.5MPa, the reaction temperature is 85°C, and the residence time is 1 hour. The molar contents of hydrogen: ethylene: 1-hexene in the system are 13.5%: 21.6%: 64.9%, respectively. The aggregation results are shown in Table 1.

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PUM

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Abstract

The invention relates to a kind of ethylene polymerization or co-polymerization method. The method contains the steps as follows: in ring-canal form reactor and condition of catalyst, procee polymerization reaction with ethylene and more than a C3-C8 alpha-alkene slurry, and the catalyst mentioned above contains the reaction product of titanium catalyst constituent and organic aluminium compound. Ethylene and alpha-alkene combined polymer manufactured by the method has low density, and needs little quantity of comonomer. So it can make the residual comonomer in polymer quantity decline badly, which already had flash vaporization and renovation with diluent in ring-canal polymerization reaction industrial art, and can improve the quality of end combined polymer. At the same time, the polymer also has high bulk density, and low fine powder content in resin.

Description

technical field [0001] The present invention relates to a kind of method of ethylene polymerization or copolymerization, more specifically, relate to a kind of slurry loop copolymerization method of ethylene and α-olefin. Background technique [0002] As we all know, linear low-density polyethylene (LLDPE) has been widely used in products such as packaging films and agricultural films. Linear low-density polyethylene resin is a copolymer of ethylene and α-olefin. When the carbon number of α-olefin is higher, the performance of the copolymer is more ideal. Commercially successful products have been obtained so far, and are usually prepared by gas phase fluidized bed polymerization or slurry loop polymerization. Low-density and narrow-molecular-weight polymers can be obtained by gas-phase polymerization, and such polymers are more suitable for the manufacture of thin film products. However, this method is very inconvenient for the preparation of copolymers of ethylene and li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F10/02
Inventor 陈伟周俊领郭子芳郭蕾李瑞霞王瑞平刘月祥王洪涛程晓静史新波
Owner CHINA PETROLEUM & CHEM CORP
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