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A kind of ultra-high molecular weight ethylene polymer catalyst and its preparation method and application

A technology of ethylene polymerization and catalyst, which is applied in the field of ultra-high molecular weight ethylene polymer catalyst and its preparation, and can solve problems such as unsatisfactory ethylene polymerization activity

Active Publication Date: 2020-08-21
谢炳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the catalyst reported by CN101906181A is used for ethylene polymerization, the bulk density is high, but the ethylene polymerization activity is not satisfactory

Method used

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  • A kind of ultra-high molecular weight ethylene polymer catalyst and its preparation method and application
  • A kind of ultra-high molecular weight ethylene polymer catalyst and its preparation method and application
  • A kind of ultra-high molecular weight ethylene polymer catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Add 2 grams of magnesium ethoxide, 4ml of octanol and 15ml of n-heptane into a reactor protected by inert gas, and add 0.03mol of tetramethyl (1,2,3,4-tetrahydroquinoline-2, 4-Disubstituted) bisphosphate, after heating and refluxing for 2 hours, cool the system to -25°C, slowly add 20ml of titanium tetrachloride and stir for 1 hour, then add 0.4g of diisophthalic acid after heating to 60°C The butyl ester was reacted for 2 hours, the supernatant was filtered off, and 25ml of a mixed solution of titanium tetrachloride and ethyl titanate (volume ratio = 1:1) was added. The temperature was raised to 110°C and reacted for 2 hours, filtered, washed, and vacuum dried. The solid catalyst is referred to as catalyst 1.

Embodiment 2

[0073] With reference to the method of Example 1, the catalyst of Example 2 can be prepared according to the raw material ratio in Table 1 below, which are denoted as Catalyst 2, Catalyst 3, Catalyst 4, Catalyst 5, Catalyst 6, Catalyst 7, and Catalyst 8.

Embodiment 3

[0076] Example 3 Polymerization activity test

[0077] The catalysts prepared in the above Examples 1 and 2 and Comparative Example 1 were used for the catalytic reaction activity test. Replace the 10L polymerization reactor with nitrogen, add 5000ml of hexane, 0.01mol of triethylaluminum, 30 mg of the catalyst prepared in Examples 1, 2 and Comparative Example 1, control the pressure at 1.0MPa, feed ethylene, and control the polymerization temperature at 60 ℃~75℃, polymerize for 2 hours, vent the gas in the reactor, reduce to normal pressure, remove the solvent, and obtain ultra-high molecular weight polyethylene product. The polymerization results are listed in Table 1:

[0078] Table 1

[0079]

[0080] It can be seen from the results in Table 1 that, compared with the comparative catalysts 1-3, the catalysts 1-8 have higher catalytic activity, the obtained polymer has a higher bulk density, and the molecular weight is also higher than the product obtained by the catalytic polymer...

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Abstract

The invention provides an ethylene polymer catalyst with an ultra-high molecular weight, and a preparation method and application of the catalyst. The catalyst comprises an alkoxy magnesium carrier, and an internal electron donor compound and a titanium-containing compound which are loaded on the carrier, wherein the molecular formula of the alkoxy magnesium is MgOR1R2, the internal electron donorcompound comprises an organic phosphorus compound represented as a formula I, and the titanium-containing compound comprises TiCl4. The catalyst has the characteristics of high activity and flexibleadjustment of the molecular weight of the polymer when the catalyst is used for ethylene polymerization, and the obtained polymer is high in packing density, and has a molecular weight which can reach6.7 million.

Description

Technical field [0001] The invention relates to an ultra-high molecular weight ethylene polymer catalyst and a preparation method and application thereof, in particular to a preparation method of a supported titanium catalyst. Background technique [0002] Ultra-high molecular weight polyethylene (hereinafter referred to as "UHMWPE") has unparalleled impact resistance, abrasion resistance, chemical resistance, low temperature resistance, stress crack resistance, adhesion resistance, and excellent insulation properties unmatched by other engineering plastics , Safety, hygiene and self-lubricating performance, can be widely used in machinery, papermaking, mining, electric power, agriculture, sports, transportation and other fields. [0003] UHMWPE generally has a molecular weight of more than 1.5 million and a low melt index. The product mainly exists in powder form. The morphology, particle size distribution and bulk density of UHMWPE powder are important characteristics, which ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F110/02C08F4/649C08F4/651
Inventor 谢炳
Owner 谢炳
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