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A kind of ultrahigh molecular weight polyethylene catalyst and preparation method thereof

An ultra-high molecular weight and catalyst technology, applied in the field of olefin polymerization catalysts, can solve the problem of sacrificing the industrial production efficiency and reprocessability of polyethylene resin, low molecular weight of ultra-high molecular weight polyethylene, poor specific surface area, pore size, and pore volume, etc. problems, to achieve the effect of improving material transfer speed, good shape and less environmental pollution

Active Publication Date: 2021-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors have found that the specific surface area, pore size, and pore volume of the prepared carrier material are not good, resulting in uneven distribution of catalyst active points and low catalyst loading, resulting in low molecular weight of ultra-high molecular weight polyethylene.
However, the method of directly loading the catalyst on the graphene sheet structure sacrifices the industrial production efficiency and reprocessability of polyethylene resin, and the problem of sticking to the still during polymerization is serious, which is not conducive to Industrial scale preparation

Method used

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  • A kind of ultrahigh molecular weight polyethylene catalyst and preparation method thereof
  • A kind of ultrahigh molecular weight polyethylene catalyst and preparation method thereof
  • A kind of ultrahigh molecular weight polyethylene catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Preparation of graphene oxide carrier

[0027] 10 grams of graphene oxide was prepared into a 10 mg / mL aqueous solution with deionized water, and after ultrasonic treatment for 45 minutes, 4 grams of (Z)-mono-9-octadecenoic acid sorbitan ester and 2 grams of hexadecylsulfonic acid were added sodium. After being stirred by a homogenizer at 3500 R / min for 30 minutes, 5 g of N,N-diethyl-p-phenylenediamine was added, and heated to 80° C. in the reactor for 2 hours to react. After cooling to room temperature, wash with anhydrous hexane, vacuum dry and set aside, the average particle size of the graphene carrier is 25 μm, and the specific surface area is 96m 2 / g.

[0028] 2) Catalyst preparation

[0029] Take 0.5 g of the above-mentioned graphene-like spherical carrier material in a three-necked flask fully replaced with nitrogen, and add 50 mL of n-heptane and 50 mL of titanium tetrachloride successively at -20 ° C. After constant temperature reaction for 2 hours, add...

Embodiment 2

[0033] 10 grams of graphene oxide was prepared into a 12 mg / mL aqueous solution with deionized water, and after ultrasonic treatment for 30 minutes, 5 grams of (Z)-mono-9-octadecenoic acid sorbitan ester and 1.5 grams of hexadecyl sulfonate were added Sodium acid. After being stirred by a homogenizer at 4000 R / min for 30 minutes, 3 g of N,N-dibutyl-p-phenylenediamine was added, and heated to 100° C. in the reactor for 3 hours to react. After cooling to room temperature, wash with anhydrous hexane, dry in vacuum and set aside. The average particle size of the graphene carrier is 18 μm, and the specific surface area is 87 m 2 / g.

[0034] Catalyst preparation and polymerization reaction are the same as embodiment 1.

Embodiment 3

[0036]10 grams of graphene oxide was prepared into an 8 mg / mL aqueous solution with deionized water, and after ultrasonic treatment for 50 minutes, 8 grams of (Z)-mono-9-octadecenoic acid sorbitan ester and 3 grams of hexadecylsulfonic acid were added sodium. After being stirred by a homogenizer at 5000 R / min for 30 minutes, 6 g of N,N-dipropyl-p-phenylenediamine was added, and heated to 120° C. in the reactor for 2.5 hours to react. After cooling to room temperature, wash with anhydrous hexane, dry in vacuum and set aside. The average particle size of the graphene carrier is 15 μm, and the specific surface area is 78 m 2 / g.

[0037] Catalyst preparation and polymerization reaction are the same as embodiment 1.

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Abstract

The invention discloses an ultra-high molecular weight polyethylene catalyst, which uses a titanium-containing compound directly supported by spherical graphene oxide as the main component of the catalyst, which can solve the problem of sticking to the kettle during continuous polymerization when used in the polymerization reaction, and the shape of the polymer particles Good, less fine powder, especially suitable for preparing antistatic ultra-high molecular weight polyethylene by slurry polymerization process. Described spherical graphene oxide is prepared by the following method: 1) preparation graphene oxide aqueous phase slurry, graphene oxide concentration is 8-15mg / mL; 2) slurry adds surfactant after ultrasonic treatment 30-60 minutes, in Stirring at 3000-5000 rpm for 10-40 minutes; 3) adding the amine compound of formula (I) and reacting at 80-120° C. for 1-3 hours to obtain spherical graphene oxide. The invention further discloses a preparation method of the ultra-high molecular weight catalyst.

Description

technical field [0001] The invention belongs to the field of olefin polymerization catalysts, in particular to an ultra-high molecular weight polyethylene catalyst and its preparation technology. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE for short) is polyethylene with a molecular weight of more than 1.5 million. Compared with ordinary engineering plastics, UHMWPE has advantages that ordinary polyolefin materials do not have. Its strength is 2 orders of magnitude higher than that of ordinary polyethylene (PE), its wear resistance is 8 times that of steel, and its impact resistance is higher than that of polyethylene. Twice that of carbonate (PC), but also has good chemical resistance, excellent noise reduction and low friction coefficient, etc., in high-tech fields such as biomedicine, microelectronics, chemical machinery, as well as grain processing, textile machinery and other industries has been more and more widely used. [0003] Gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F4/642C08F4/02
CPCC08F110/02C08F4/02C08F4/6421
Inventor 黄安平高琳张文学段宏义李艳芹李丽刘文霞拜永孝徐人威杨世元李广全陈旭刘永军刘芸杨柳
Owner PETROCHINA CO LTD
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