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Polymerizing method of ethylene emulsion for adjusting and controlling the molecular weight of polyethylene

A technology of ethylene emulsion and polymerization method, which is applied in the production of liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problems such as the inability to regulate the molecular weight of polyethylene

Inactive Publication Date: 2010-08-18
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these ethylene emulsion polymerization methods can control the molecular weight of polyethylene at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 1 gram of mesoporous silica nanoparticles with 0.2 gram of water, add 100 ml of benzene, stir for 1 hour, then add 0.011 mol of vinyltrichlorosilane, and stir for 4 hours to obtain mesoporous bismuth modified with vinyl functional groups. Silicon oxide nanoparticles.

[0023] Take 0.1 g of the above-mentioned functionalized mesoporous silica nanoparticles and 0.1 mmol of bis-(cyclooctyl-1,5-diene)nickel and 0.1 mmol of ethyl 4,4,4-trifluoro-2-( Mix triphenylphosphine (ylide)-acetyl ethyl ester, add 0.5 ml of toluene, stir for 20 minutes, disperse in 100 ml of water, add 1 gram of sodium lauryl sulfate, and sonicate for 1 minute. The dispersed emulsion was transferred to an autoclave, fed with ethylene gas, kept at 50 atmospheric pressure, heated up to 50 degrees Celsius, stirred, and reacted for 2 hours to obtain a polyethylene emulsion. The polyethylene has a number average molecular weight of 520 and a weight average molecular weight of 1200.

Embodiment 2

[0025] All the implementation conditions are the same as in Example 1, but with 1 milliliter of toluene to dissolve two-(cyclooctyl 1,5-diene) nickel and ethyl 4,4,4-trifluoro-2-(triphenylphosphine ylide )-acetyl ethyl ester. The number average molecular weight of polyethylene is 630, and the weight average molecular weight is 1165.

Embodiment 3

[0027] All the implementation conditions are the same as in Example 1, but with 3 milliliters of toluene to dissolve two-(cyclooctyl 1,5-diene) nickel and ethyl 4,4,4-trifluoro-2-(triphenylphosphine ylide )-acetyl ethyl ester. The polyethylene has a number average molecular weight of 760 and a weight average molecular weight of 3500.

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Abstract

The invention relates to a polymerizing method of ethylene emulsion in the technical field of polymer preparation for adjusting and controlling the molecular weight of polyethylene. The polymerizing method is that: an ethylene polymerization catalyst is obtained by firstly dissolving bis-(1, 5-cyclooctadiene) nickel and ethyl 4,4,4-trifluoro-2-(triphenylphosphine ylide)-acetoacetic ester by little methylbenzene and then mixing is carried out; a supported catalyst is obtained by mixing the ethylene polymerization catalyst and middle-hole silicon dioxide nano granules functionalized by ethylene; by dispersing the supported catalyst in water, adding a surface active agent and carrying out an ultrasonic treatment, stable emulsion is obtained; at last, polyethylene emulsion is obtained by inputting the ethylene, increasing the temperature and polymerizing. In the polymerizing method, by adjusting and controlling the dosage of the methylbenzene, polyethylene with different molecular weight can be obtained; the molecular weight of the polyethylene is increased along with the increasing of the methylbenzene quantity.

Description

technical field [0001] The invention relates to an ethylene emulsion polymerization method in the technical field of polymer preparation, in particular to an ethylene emulsion polymerization method capable of regulating the molecular weight of polyethylene. Background technique [0002] Polyethylene is the most widely used polymer material. In recent years, the synthesis of polyethylene by emulsion polymerization has received attention. Ethylene emulsion polymerization is safe, reliable, environmentally friendly and cost-effective, and the synthetic polyethylene latex is easy to process. Since the molecular weight of polyethylene is closely related to its performance, it is of great significance to regulate the molecular weight of polyethylene. [0003] After searching the literature of the prior art, it was found that Monteil, V et al reported a method for ethylene emulsion polymerization in "Journal of the American Chemical Society" (Journal of the American Chemical Socie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F4/80C10G50/00C08F4/02C08F2/24
Inventor 魏良明张亚非
Owner SHANGHAI JIAOTONG UNIV
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