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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: 2021-04-20
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

Experimental program
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preparation example Construction

[0093]According to Chinese patent CN200910210986.4, the preparation method of the preferred supported non-metallocene catalyst of the present invention is disclosed, comprising the following steps: dissolving the magnesium compound and the non-metallocene ligand in a solvent to obtain a magnesium compound solution; adding a precipitation agent to the magnesium compound solution to obtain a modified carrier; and treating the modified carrier with a chemical treatment agent selected from group IVB metal compounds to obtain the supported non-metallocene catalyst.

[0094] The steps for obtaining the magnesium compound solution are specifically described below.

[0095] Specifically, the magnesium compound (solid) and the non-metallocene ligand are dissolved in an appropriate solvent (ie, a solvent for dissolving the magnesium compound), thereby obtaining the magnesium compound solution.

[0096] As the solvent, for example, C 6-12 Aromatic hydrocarbons, halogenated C 6-12 Solve...

Embodiment 1

[0296] 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 non-metallocene ligand adopts the structure compound of.

[0297] Weigh 5g of anhydrous magnesium chloride and non-metallocene ligands, add tetrahydrofuran solvent and dissolve completely at room temperature, stir for 2 hours, add precipitant hexane to make it precipitate, filter, wash 2 times, the amount of precipitant each time is the same as that added before The same amount was uniformly heated to 60°C and vacuum-dried to obtain a modified carrier.

[0298] Then add 60ml of hexane to the modified carrier, add titanium tetrachloride dropwise for 30 minutes under stirring conditions, stir and react at 60°C for 4 hours, filter, wash with hexane twice, and use 60ml of hexane each time, Vacuum drying at room temperature to obtain a suppor...

Embodiment 1-1

[0302] Basically the same as Example 1, but with the following changes:

[0303] 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 ).

[0304] 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: 0.15; The solvent volume ratio of the metal ligand is 1:2; the molar ratio of the magnesium compound to the chemical treatment agent is 1:0.20.

[0305] Supported non-metallocene catalysts are designated CAT-2.

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Abstract

The invention relates to a copolymerized ultra-high molecular weight polyethylene, its production method and application. The co-polymerized ultra-high molecular weight polyethylene has significantly improved processability compared to prior art homopolymerized ultra-high molecular weight polyethylene, 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
CPCC08F210/16C08F2500/01C08F4/645C08F4/02C08F210/06C08F210/08
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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