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Ultra-high molecular weight polyethylene, its production method and its application

An ultra-high molecular weight, polyethylene technology, applied in the field of copolymerized ultra-high molecular weight polyethylene, can solve the problem that it is difficult to obtain ultra-high molecular weight polyethylene with good chain transfer characteristics, does not reach the conventional level of ultra-high molecular weight polyethylene, and the height is only 8.72 dl and other problems, to achieve the effect of easy molding, processing and application, insignificant activity attenuation, low loss of wear resistance and impact strength performance

Active Publication Date: 2021-05-07
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent claims that ultra-high molecular weight ethylene / polyene copolymers can be produced, according to its examples, the highest intrinsic viscosity of the produced ethylene / polyene copolymers is only 8.72dl / g, which is far from reaching ultra-high molecular weight polyene copolymers. Conventional levels of ethylene (typically at least 11.0dl / g), so it is difficult to say that the patent has successfully produced co-polymerized UHMWPE
[0012] And when the existing catalysts for catalyzing ethylene polymerization are used for the homopolymerization of α-olefins (such as propylene or 1-butene, etc.), the catalyst needs to add an internal electron donor (ester or ether compound) during the preparation process, and in During the polymerization of propylene or 1-butene, it is necessary to add an external electron donor, and it is difficult to obtain ultra-high molecular weight polyethylene due to the good chain transfer characteristics of the internal and external electron donors when the catalyst is added to the catalyst of the internal and external electron donors. Copolymerized UHMWPE is difficult to be applied

Method used

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  • Ultra-high molecular weight polyethylene, its production method and its application
  • Ultra-high molecular weight polyethylene, its production method and its application
  • Ultra-high molecular weight polyethylene, its production method and its application

Examples

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preparation example Construction

[0092]According to Chinese patent CN200910210984.5, a method for preparing a supported non-metallocene catalyst preferably used in the present invention is disclosed, which includes the following steps: dissolving a magnesium compound and a non-metallocene ligand in a solvent to obtain a magnesium compound solution; The step of mixing the porous carrier optionally subjected to thermal activation treatment with the magnesium compound solution to obtain a mixed slurry; adding a precipitating agent to the mixed slurry to obtain a composite carrier; and using a chemical compound selected from group IVB metal compounds A step of treating the composite carrier with a treating agent to obtain the supported non-metallocene catalyst.

[0093] The steps for obtaining the magnesium compound solution are specifically described below.

[0094] Specifically, the magnesium compound (solid) and the non-metallocene ligand are dissolved in an appropriate solvent (ie, a solvent for dissolving th...

Embodiment 1

[0314] The magnesium compound adopts anhydrous magnesium chloride, the solvent for dissolving the magnesium compound and the non-metallocene ligand adopts tetrahydrofuran, and the chemical treatment agent adopts titanium tetrachloride. The porous carrier adopts silicon dioxide, that is, silica gel, the model is ES757 of Ineos Company, and the non-metallocene ligand adopts the structure of compound of.

[0315] Firstly, the silica gel was continuously fired at 600° C. under nitrogen atmosphere for 4 hours to thermally activate it.

[0316] Weigh 5g of anhydrous magnesium chloride and non-metallocene ligands, add tetrahydrofuran solvent and dissolve completely at room temperature, then add heat-activated silica gel, stir for 2 hours, add precipitant hexane to make it precipitate, filter, wash 2 times, The amount of the precipitating agent added each time is the same as that added before, and it is evenly heated to 60° C. and dried under vacuum to obtain a composite carrier.

...

Embodiment 1-1

[0321] Basically the same as Example 1, but with the following changes:

[0322] The porous carrier was changed to Grace's 955, and it was continuously calcined at 400° C. for 8 hours under a nitrogen atmosphere to be thermally activated.

[0323] Non-metallocene ligands use , the solvent for dissolving magnesium compounds and non-metallocene ligands was changed to toluene, the precipitating agent was changed to cyclohexane, and the chemical treatment agent was changed to zirconium tetrachloride (ZrCl 4 ).

[0324] The ratio is as follows: the ratio of magnesium compound to toluene is 1mol: 150ml; the molar ratio of magnesium compound to non-metallocene ligand is 1:0.15; the mass ratio of magnesium compound to porous carrier is 1:4; the precipitation agent and dissolved magnesium compound The volume ratio of the solvent to the non-metallocene ligand is 1:2; the molar ratio of the magnesium compound to the chemical treatment agent is 1:0.20.

[0325] Supported non-metalloce...

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Abstract

The invention relates to a copolymerized ultra-high molecular weight polyethylene, its production method and application. Compared with prior art homopolymerized ultrahigh molecular weight polyethylene, the processability of the copolymerized ultrahigh molecular weight polyethylene is significantly improved, and exhibits improved wear resistance and impact strength properties.

Description

technical field [0001] The invention relates to an ultra-high molecular weight polyethylene. Specifically, the present invention relates to a copolymerized ultra-high molecular weight polyethylene, its production method and its application. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) generally refers to polyethylene with a relative molecular weight of more than 1.5 million g / mol. According to whether it contains comonomer units, it can be divided into homopolymerized ultra-high molecular weight polyethylene and copolymerized ultra-high molecular weight polyethylene. The ultra-high molecular weight polyethylene referred to in the art generally refers to homopolymerized ultra-high molecular weight polyethylene. [0003] Ultra-high molecular weight polyethylene has excellent wear resistance, high impact strength, excellent self-lubrication performance, excellent chemical resistance and low temperature resistance, excellent anti-adhesion, H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16C08F4/645C08F4/02C08F210/06C08F210/08
CPCC08F210/16C08F2500/01C08F4/645C08F4/02C08F210/06C08F210/08C08F4/025C08F4/6543C08F4/651C08F2/001
Inventor 李传峰任鸿平汪文睿梅利郭峰左胜武
Owner SINOPEC YANGZI PETROCHEM
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