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Catalyst for preparing ultra-high molecular weight polyethylene

A technology of ultra-high molecular weight and catalyst, which is applied in the field of catalyst system for preparing ultra-high molecular weight polyethylene, which can solve the problems of many catalyst preparation steps and unfavorable industrial production, and achieve the effects of good fluidity, reduced application, and favorable industrial production

Active Publication Date: 2010-09-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, there are many catalyst preparation steps, and more alkylaluminum is used to prepare intermediate products, which is not conducive to industrial production

Method used

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  • Catalyst for preparing ultra-high molecular weight polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of the solid main component of the catalytic body

[0026] Add 2g of magnesium ethoxide and 15ml of isooctyl alcohol into a reactor fully replaced by nitrogen, and feed CO 2, add 0.5ml of dibutyl phthalate, stir for 1 hour, add 15ml of silicon tetrachloride, react for 2 hours, add the mixed liquid dropwise to 20ml of cooled titanium tetrachloride, slowly heat up, react for 2 hours, filter Then add 20ml of mixed solution of titanium tetrachloride and butyl titanate (10:1) to the solid, raise the temperature to 120°C and react for 2 hours, filter, wash the solid catalyst with hexane for 5 times, and dry it in vacuum to obtain the main component of the catalyst solid .

[0027] (2) Polymerization reaction

[0028] Replace the 10L polymerization reactor with nitrogen, add 5000ml of hexane, 0.01mol of triethylaluminum, 20mg of the solid main component of the above catalyst, control the pressure at 1.0MPa, feed ethylene, control the polymerization temperatur...

Embodiment 2

[0030] (1) Preparation of the solid main component of the catalytic body

[0031] Add 3.4g of butylmagnesium and 20ml of 1,3-propanediol into a reactor fully replaced by nitrogen, and feed CO 2 , add 1ml of diisobutyl phthalate, stir for 1 hour, add 18ml of trimethylchlorosilane, react for 2 hours, add the mixed liquid dropwise to 25ml of cooled titanium tetrachloride, slowly heat up and react for 2 hours, After filtering, add 22ml of mixed solution of titanium tetrachloride and butyl titanate (5:1) to the solid, raise the temperature to 120°C for 2 hours, filter, wash the solid catalyst with hexane for 5 times, and dry it in vacuum to obtain the catalyst solid main group. share.

[0032] (2) Polymerization reaction

[0033] Replace the 10L polymerization reactor with nitrogen, add 4000ml of hexane, 0.012mol of triisobutylaluminum, 20mg of the above-mentioned solid main component of the catalyst, control the pressure at 1.0MPa, feed ethylene, control the polymerization tempe...

Embodiment 3

[0035] (1) Preparation of the solid main component of the catalytic body

[0036] Add 3.5g of magnesium chloride and 18ml of ethylene glycol into a reactor fully replaced by nitrogen, and feed CO 2 , add 3ml tetrahydrofuran, stir for 1 hour, add 20ml trimethoxychlorosilane, react for 2 hours, add the mixed liquid dropwise to 25ml cooled titanium tetrachloride, slowly heat up and react for 2 hours, filter and add 25ml A mixed solution of titanium tetrachloride and butyl titanate (10:1) was heated to 120°C for 2 hours, filtered, and the solid catalyst was washed 5 times with hexane, and vacuum-dried to obtain the main catalyst solid component.

[0037] (2) Polymerization reaction

[0038] Replace the 10L polymerization reactor with nitrogen, add 5000ml hexane, 0.015mol monochlorodiethylaluminum, 20 mg of the above-mentioned solid main component of the catalyst, control the pressure at 1.0MPa, feed ethylene, control the polymerization temperature at 72°C, and polymerize In 2 ho...

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Abstract

The invention relates to a catalyst system of ultra-high molecular weight polyethylene, which comprises a magnesium compound carrier-supported titanium catalyst solid main component and an aluminum alkyl compound catalyst promoter component. The catalyst system of ultra-high molecular weight polyethylene is characterized in that carbon dioxide, alcohol and silicon compound are added to process the magnesium compound carrier in the preparation process of the catalyst solid main component, and the titanium content and the ester content in the catalyst system are adjusted by adjusting the addition of titanate in the processing of supporting titanium to change the growing ability of polymer on the catalyst active site, adjust the initial activity of the catalyst and improve the performance of the polymer. The catalyst has the advantage of simple preparation method, and is beneficial to industrial production. The particle diameter of ultra-high molecular weight polyethylene prepared by the catalyst is limited in a certain range, the generation of fine powder and coarse particles is reduced, and the stacking density is increased.

Description

technical field [0001] The invention relates to a catalyst system for preparing ultra-high molecular weight polyethylene, in particular to a supported catalyst system capable of preparing ultra-high molecular weight polyethylene with high bulk density and good shape. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic engineering plastic with excellent comprehensive properties. It has outstanding wear resistance (8-9 times that of steel and 2.8 times that of nylon), excellent impact resistance ( It is 2-5 times that of polycarbonate, 5 times that of ABS, and 1.5 times that of polyoxymethylene), and its coefficient of friction is low (its dynamic friction coefficient is 0.10-0.22, which is an ideal self-lubricating material). In addition, because it also has excellent Excellent chemical resistance, low temperature resistance, sound attenuation, extremely low water absorption and excellent environmental stress cracking resistance,...

Claims

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Application Information

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IPC IPC(8): C08F4/622C08F10/02
Inventor 黄安平朱博超贾军纪韦少义姚培洪张平生高琳朱雅杰郝萍黄春波
Owner PETROCHINA CO LTD
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