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Synthetic method of ultra-high molecular weight polyethylene

A technology of ultra-high molecular weight and synthesis method, applied in the field of synthesis of ultra-high molecular weight polyethylene, can solve the problems of complex preparation process of catalysts and the like

Inactive Publication Date: 2019-01-18
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts usually require complex preparation procedures

Method used

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  • Synthetic method of ultra-high molecular weight polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 prepares supported catalyst

[0027] Under anhydrous and oxygen-free conditions, add 2 mL of methylmagnesium chloride Grignard reagent to 0.5 g of the carrier, stir for 2 hours and then filter for the first time, wash the filter cake with toluene three times, and then mix with 2 mL of TiCl 4 After mixing and stirring for 2 hours, a second filtration was performed, and the filter cake was dried to obtain 1.2 g of supported catalyst.

Embodiment 2

[0028] Embodiment 2 catalytic ethylene polymerization

[0029] In a 1L stainless steel autoclave, add 35 mg of supported catalyst, 600 ml of n-hexane solvent, and add triisobutylaluminum (TIBA) according to the Al / Ti molar ratio of 100, at a polymerization temperature of 50 ° C, under 5 atmospheres of ethylene , reacted for 30 minutes, and the viscosity average molecular weight of the obtained polyethylene was 2.28 million.

Embodiment 3

[0030] Embodiment 3 catalytic ethylene polymerization

[0031] In a 1L stainless steel autoclave, add 33 mg of supported catalyst, 600 ml of n-hexane solvent, and add triisobutylaluminum (TIBA) according to the Al / Ti molar ratio of 100. , reacted for 30 minutes, and the viscosity-average molecular weight of the obtained polyethylene was 1.71 million.

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Abstract

The invention discloses a synthetic method of ultra-high molecular weight polyethylene. The method comprises the following steps: in water-free and oxygen-free conditions, adding a methyl magnesium chloride Grignard reagent into a carrier, carrying out primary filtration after stirring for 2 to 3 h, after washing a filter cake with a solvent, mixing with TiCl4, carrying out secondary filtration after stirring for 2 to 3 h, and drying the filter cake to obtain a supported catalyst; adding the obtained support catalyst, normal hexane and triisobutyl aluminum into a reaction still, and at the temperature of 50 to 60 DEG C, carrying out an ethylene reaction for 30 to 120 min at 0.5 to 1 MPa to obtain the ultra-high molecular weight polyethylene. The most coomon polyolefin coordination polymerization catalyst Z-N catalyst is loaded by simply using the carrier with a porous structure, and the ultra-high molecular weight polyethylene can be obtained by using the catalyst to catalyze vinyl polymerization.

Description

(1) Technical field [0001] The invention relates to a method for synthesizing ultrahigh molecular weight polyethylene. (2) Background technology [0002] Ultra-high molecular weight polyethylene (UHMWPE) was first successfully developed in 1957 by the United Chemical Company of the United States with a Ziegler catalyst, and was first industrialized by the German Herchester Company in 1958. It is a linear homopolymer of ethylene, usually with a molecular weight of 1 to 5 million. Compared with many polymer materials, UHMWPE has a small friction coefficient, low wear, excellent chemical resistance, impact resistance, pressure resistance, frost resistance, heat preservation, self-lubrication, anti-fouling, and stress crack resistance. , hygiene and other advantages. [0003] In the early days, the synthesis patents of ultra-high molecular weight polyethylene were mainly in the hands of oil companies in some developed countries such as Germany, the United States, and Japan: su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/02
CPCC08F110/02C08F4/027C08F2500/01
Inventor 雷金化王竹倩邱化玉
Owner HANGZHOU NORMAL UNIVERSITY
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