Preparation method of ultrahigh molecular weight polyethylene

A technology of ultra-high molecular weight and polyethylene, applied in the chemical field, can solve problems such as difficult operation, and achieve the effects of simple operation, mild experimental conditions, and strong industrial application value

Inactive Publication Date: 2012-04-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, technical adjustment of the molecular weight of polyethylene requires changing the catalyst components, that is, the preparation of different catalysts, so it is difficult to adjust the molecular weight of ultra-high molecular weight polyethylene.

Method used

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  • Preparation method of ultrahigh molecular weight polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A 5L tank reactor is used, and the polymerization tank that has been dewatered and deoxygenated is filled with N 2 After purging for at least 3 times, inject 1.5L of hexane dried with molecular sieves and blown with nitrogen, add a certain amount of triethylaluminum and 20 mg of BCS01 catalyst, and 600 ml of hexene after deoxidation, dehydration, and purification, and tetrahydrofuran (THF), control THF / Ti=0.3 (molar ratio), and finally add 1.0L of hexane to flush the catalyst pipeline, then raise the temperature of the reactor, and add a sufficient amount of chain transfer agent H at one time when the temperature rises to 58°C 2 , control H 2 / C 2 h 4 =0.05 (molar ratio), then continuously add ethylene, the ethylene partial pressure is 1.0MPa, carry out constant pressure for 1 hour, the experimental results obtained are shown in Table 1.

Embodiment 2

[0033] The control hexene addition is 100ml, THF / Ti=1.8 (molar ratio), other experimental procedure is the same as embodiment 1, the experimental result that obtains is shown in Table 1.

Embodiment 3

[0035] The control hexene addition is 100ml, THF / Ti=1 (molar ratio), other experimental procedure is the same as embodiment 1, and the experimental result that obtains is shown in Table 1.

[0036] Table 1

[0037]

[0038] The test results of the above examples show that, using the BCS01 catalyst, after carrying out the copolymerization of ethylene and hexene and adding a certain amount of external electron donor, the molecular weight of the polymer has been significantly improved, and ultra-high molecular weight polyethylene is obtained. The added amount of olefin and the added amount of external electron donor can conveniently adjust the molecular weight of ultra-high molecular weight polyethylene. Under the control of hydrogen added amount, ultra-high molecular weight polyethylene with a molecular weight of more than 8 million can be obtained. The method has mild experimental conditions, simple operation and strong industrial application value.

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Abstract

The invention provides a preparation method of ultrahigh molecular weight polyethylene, comprising the step of adding an external electron donor in the presence of a catalyst and a cocatalyst for ethene and alpha alkene copolymerization to prepare ultrahigh molecular weight polyethylene. The catalyst contains a magnesium-and-titanium-containing solid loaded with at least one titanium compound and at least one electron donor. The magnesium-and-titanium-containing solid is obtained by steps of dissolving the magnesium compound in a solvent system to form a uniform solution, optionally adding an assistant precipitation agent in the presence of a titanium halide, and precipitating the magnesium-and-titanium-containing solid precipitate again. The method provided by the invention can be used to obviously raise the molecular weight of polyethylene and obtain ultrahigh molecular weight polyethylene. The method requires mild experimental conditions, is simple to operate, and has a strong industrial application value.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a preparation method of ultra-high molecular weight polyethylene. Background technique [0002] According to ASTM D4020-81, ultra-high molecular weight polyethylene refers to branched polyethylene with a relative viscosity of 2.30 or higher measured in 100ml of 0.05% decahydronaphthalene solution at 135°C, and a viscosity-average molecular weight of 150 More than 10,000 polyethylene. The chain length of ultra-high molecular weight polyethylene is 10 to 20 times that of ordinary HDPE. Ultra-high molecular weight polyethylene has excellent wear resistance, impact resistance and impact energy absorption, self-lubricating properties, chemical corrosion resistance, low temperature resistance, insulation properties, etc., and is an engineering plastic prepared from ordinary raw materials. [0003] Catalysts for producing polyethylene in industry are generally not suitable for producing ultra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F4/649
Inventor 李汝贤倪明刘金伟于鲁强王路生杨岭徐彦龙
Owner CHINA PETROLEUM & CHEM CORP
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