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

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Problems solved by technology

However, adjusting the molecular weight of polyethylene in this patent requires changing the catalyst components, that is, p

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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