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

A technology of ultra-high molecular weight and polyethylene, 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, and it has not reached the conventional level of ultra-high molecular weight polyethylene, and the maximum is only 8.72 dl and other problems, to achieve the effects of easy molding processing and application, no obvious activity attenuation, low loss of wear resistance and impact strength performance

Active Publication Date: 2021-03-26
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 the Chinese patent CN200910210988.3, ​​the preparation method of the preferred supported non-metallocene catalyst used in the present invention is disclosed, which includes the following steps: dissolving the magnesium compound and the non-metallocene ligand in a solvent to obtain the magnesium compound solution steps; mixing the porous carrier optionally subjected to thermal activation treatment with the magnesium compound solution to obtain a mixed slurry; drying the mixed slurry to obtain a composite carrier; and chemical treatment selected from group IVB metal compounds The step of treating the composite carrier with an 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 the magnesium compound), there...

Embodiment 1

[0297] 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.

[0298] Firstly, the silica gel was continuously fired at 600° C. under nitrogen atmosphere for 4 hours to thermally activate it.

[0299] 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, heat evenly to 90°C and directly vacuum-dry to obtain a composite carrier.

[0300] Then add 60ml of hexane to the composite carrier, add titanium tetrachloride dropwise for 30 minutes under stirring conditions, stir and react at 60°C for 4 hours...

Embodiment 1-2

[0304] Basically the same as Example 1, but with the following changes:

[0305] The porous carrier adopts aluminum oxide. Aluminum oxide was continuously calcined at 700°C for 6 hours under a nitrogen atmosphere.

[0306] The magnesium compound is changed to anhydrous magnesium bromide (MgBr 2 ), the non-metallocene ligand adopts , the solvent for dissolving magnesium compounds and non-metallocene ligands was changed to ethylbenzene, and the chemical treatment agent was changed to titanium tetrabromide (TiBr 4 ).

[0307] Wherein the ratio is, the ratio of the magnesium compound to the solvent for dissolving the magnesium compound and the non-metallocene ligand is 1mol: 250ml; the molar ratio of the magnesium compound to the non-metallocene ligand is 1:0.20; the mass ratio of the magnesium compound to the porous carrier is 1:1; the molar ratio of magnesium compound to chemical treatment agent is 1:0.30.

[0308] Supported non-metallocene catalysts are designated CAT-2. ...

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Abstract

The invention relates to copolymerized ultra-high molecular weight polyethylene, a production method and applications. Compared to the homopolymerized ultra-high molecular weight polyethylene in the prior, the copolymerized ultra-high molecular weight polyethylene of the present invention has the significantly-improved processability, and further has improved wear resistance and improved impact strength.

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): C08F210/16C08F210/06C08F210/08C08F210/14C08F4/642C08F4/02
CPCC08F210/16C08F210/06C08F2500/18C08F2500/17C08F2500/01C08F210/08C08F210/14C08F4/6421C08F4/022C08F4/025
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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