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Method for producing ultrahigh molecular weight polyethylene

A technology of ultra-high molecular weight and production method, which is applied in the field of ultra-high molecular weight polyethylene production, and can solve problems such as difficult molecular weight operation

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adjusting the molecular weight of polyethylene in this patent requires changing the catalyst components, that is, preparing different catalysts, so it is difficult to adjust the molecular weight of ultra-high molecular weight polyethylene.

Method used

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  • Method for producing ultrahigh molecular weight polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 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

[0022] Control THF / Ti=0.5 (molar ratio), other experimental procedures are the same as in Example 1, and the experimental results obtained are shown in Table 1.

Embodiment 3

[0024] Control THF / Ti=1 (molar ratio), other experimental steps are with embodiment 1, and the experimental result that obtains is shown in Table 1

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Abstract

The invention provides a method for producing ultrahigh molecular weight polyethylene, which comprises the following steps of: adding a certain amount of external electron donors and a certain amount of hydrogen and performing ethylene homopolymerization or ethylene and alpha-olefin copolymerization in the presence of a catalyst described in Chinese patent CN02120861.1 to obtain an ultrahigh molecular weight polyethylene product.

Description

[technical field] [0001] The invention relates to a production method of ultra-high molecular weight polyethylene. [Background technique] [0002] Ultra-high molecular weight polyethylene, according to the provisions of ASTM D4020-81, branched polyethylene with a relative viscosity of 2.30 or higher measured in 100ml of 0.05% decahydronaphthalene solution at 135°C, generally refers to a viscosity-average molecular weight of 1.5 million above 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-high molecular ...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/649C08F2/38
Inventor 于鲁强李汝贤刘金伟王路生杨岭
Owner CHINA PETROLEUM & CHEM CORP
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