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Ultrahigh molecular weight functional polyethylene and preparation method thereof

An ultra-high molecular weight, functional technology, applied in the field of functional ultra-high molecular weight polyethylene and its preparation, can solve the problems of frequent occurrence of chain transfer reactions, inability to obtain functional ultra-high molecular weight polyethylene, and decreased copolymerization activity, etc. Fast chain growth rate, less β-hydrogen chain transfer reaction, and good tolerance

Active Publication Date: 2016-12-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although single-site catalysts can catalyze the copolymerization of ethylene and polar comonomers, as the insertion rate of polar functional groups in the copolymer increases, the copolymerization activity drops sharply, and chain transfer reactions occur frequently, resulting in the highest molecular weight of the copolymer It can only reach 350,000 g / mol, and cannot obtain functional ultra-high molecular weight polyethylene

Method used

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  • Ultrahigh molecular weight functional polyethylene and preparation method thereof
  • Ultrahigh molecular weight functional polyethylene and preparation method thereof
  • Ultrahigh molecular weight functional polyethylene and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1～6

[0046] A preparation method of functional ultra-high molecular weight polyethylene, under nitrogen atmosphere, first add xylene, triisobutylaluminum and polar comonomer (n 9, FG is hydroxyl), the molar ratio of triisobutylaluminum to polar comonomer is 1.5:1; after stirring for 10min at 20°C, add modified methylalumoxane and have the structure of formula (IV) The fluorenylamine titanium complex (R 1 is adamantyl, R 2 and R 3 is methyl, R 4 ~R 10 is tert-butyl, R 11 is hydrogen, X 1 and x 2 is a methyl group), the molar ratio of the fluorenylamine titanium complex to the polar comonomer having the structure of formula (III) is 1:300, and the molar ratio of the fluorenylamine titanium complex to the modified methylaluminoxane is 1:1000; then unload the nitrogen in the kettle, and then feed ethylene gas to make the pressure in the kettle reach a certain value; stop feeding ethylene after the polymerization reaction at 30°C for 30 minutes, empty the gas in the kettle, and d...

Embodiment 7～11

[0050] A preparation method of functional ultra-high molecular weight polyethylene, under nitrogen atmosphere, firstly add toluene, triisobutylaluminum and polar co-monomer (n is 9, FG is hydroxyl), the molar ratio of triisobutylaluminum to polar comonomer is 1.5:1; after stirring at 20°C for 10min, add modified methylalumoxane and Fluorenylamine titanium complex (R 1 is tert-butyl, R 2 and R 3 is methyl, R 4 and R 5 for hydrogen, R 6 ~R 9 is tert-butyl, R 10 ~R 11 is hydrogen, X 1 and x 2 is methyl), the molar ratio of the fluorenylamine titanium complex to the modified methylaluminoxane is 1:1000; then the nitrogen in the kettle is removed, and then ethylene gas is introduced to make the pressure in the kettle reach 8bar; at 30°C Stop feeding ethylene after 30min of polymerization reaction under conditions, empty the gas discharge in the kettle, pour the reactant into the ethanol solution containing 10% (V / V) hydrochloric acid; filter the product obtained after was...

Embodiment 12～19

[0054] A preparation method of functional ultra-high molecular weight polyethylene, under nitrogen atmosphere, firstly add cyclooctane, triisobutylaluminum and polar comonomer ( FG is hydroxyl), the molar ratio of triisobutylaluminum to polar comonomer is 1.5:1; after stirring at 20°C for 10 minutes, add modified methylalumoxane and fluorenyl group having the structure of formula (IV) Amine titanium complex (R 1 is tert-butyl, R 2 and R 3 is methyl, R 4 ~R 10 is tert-butyl, R 11 is hydrogen, X 1 and x 2 is a methyl group), the molar ratio of the fluorenylamine titanium complex to the polar comonomer having the structure of formula (III) is 1:1000, and the molar ratio of the fluorenylamine titanium complex to the modified methylaluminoxane is 1:1000; then unload the nitrogen in the kettle, and then feed ethylene gas to make the pressure in the kettle reach 8bar, and the molar ratio of ethylene to polar comonomer is 150:1; stop the ventilation after the polymerization rea...

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Abstract

The invention provides ultrahigh molecular weight functional polyethylene and a preparation method thereof. In the preparation process of the ultrahigh molecular weight polyethylene, polymerized monomer ethylene is copolymerized with trialkylaluminium-protected polar comonomer in a catalyst system composed of a catalyst and a promoter to obtain the ultrahigh molecular weight functional polyethylene, the catalyst is fluorenylamine titanium complex, and the promoter is methylaluminoxane, modified methylaluminoxane or trityl tetrakis(pentafluorophenyl)borate. By polymerizing ethylene and a polar comonomer, the ultrahigh molecular weight functional polyethylene that has a controllable content of polar functional groups is acquired; the catalyst system used herein has high copolymerizing capacity for trialkylaluminium-protected polar comonomer, good chain-extending speed is kept, chain transfer reaction is overcome, and the ultrahigh molecular weight functional polyethylene is effectively acquired.

Description

technical field [0001] The invention relates to a functional ultra-high molecular weight polyethylene and a preparation method thereof, in particular to provide a functional ultra-high molecular weight polyethylene with high melting temperature and controllable polar group content and a preparation method thereof. Background technique [0002] Ultra-high molecular weight polyethylene is an unbranched linear polyethylene with a molecular weight of more than 1.5 million obtained by ethylene polymerization. Because ultra-high molecular weight polyethylene not only has excellent mechanical properties, but also has excellent chemical medium resistance, wear resistance and self-lubricating properties, impact resistance and bulletproof properties, and electrical properties, it is indispensable in national security and economic construction. The lack of important strategic materials. It has great advantages in lightweight structural composite materials and other products, and plays...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/02C08F216/04C08F220/04C08F220/10C08F228/04C08F226/02C08F4/6592
CPCC08F210/02C08F2410/03C08F2420/03C08F216/04C08F220/04C08F220/10C08F228/04C08F226/02C08F4/6592
Inventor 蔡正国马琼李天佑史新豪郭敏
Owner DONGHUA UNIV
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