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Ultrahigh molecular weight superfine polyethylene powder and preparation method thereof

An ultra-high molecular weight, polyethylene powder technology, applied in the field of polyolefin polymer materials, can solve the problems of reducing catalyst activity, unstable product performance, increasing preparation cost, etc., achieving excellent processing performance, expanding application fields and scope of application, The effect of strong chemical resistance

Active Publication Date: 2017-01-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, if a metallocene catalyst wants to achieve a sufficiently high catalytic activity, a large amount of expensive methylaluminoxane (MAO) is required as a cocatalyst, thereby increasing the cost of product preparation; on the other hand, the cocatalyst MAO is not a compound with a single composition , the production process is likely to cause unstable product performance
Ziegler-Natta catalyst is an industrialized catalyst for preparing UHMWPE. For example, ZhangH.X. et al. method, however, the internal electron donor in the Ziegler-Natta catalyst reduces the activity of the catalyst

Method used

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  • Ultrahigh molecular weight superfine polyethylene powder and preparation method thereof
  • Ultrahigh molecular weight superfine polyethylene powder and preparation method thereof
  • Ultrahigh molecular weight superfine polyethylene powder and preparation method thereof

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preparation example Construction

[0030] [Catalyst preparation method]

[0031] The catalyst used in the preparation method of the present invention can be prepared by the method disclosed in the invention patent application submitted by the applicant (application number 201510271254.1), the entirety of which is incorporated in this application as a reference.

[0032] Specifically, the catalyst used in the preparation method of the present invention is prepared by a method comprising the following steps:

[0033] (a) magnesium halide, alcohol compound, auxiliary agent, part of the internal electron donor and solvent are mixed to prepare mixture I;

[0034] (b) Add the above-mentioned mixture I into the reactor, preheat to -30°C to 30°C, and add the titanium compound dropwise; or, add the titanium compound to the reactor, preheat to -30°C to 30°C, add dropwise the above-mentioned mixture I;

[0035] (c) After the dropwise addition is completed, the temperature of the reaction system is raised to 90° C. to 13...

Embodiment 1

[0079] Ethylene homopolymer and its preparation

[0080] 1) Preparation of catalyst

[0081] In the reactor fully replaced by high-purity nitrogen, add 4.94g of anhydrous magnesium chloride, 18.9g of isooctyl alcohol, and 30ml of decane in sequence, raise the temperature to 130°C under stirring, and maintain it for 2 hours, then add 2.65g of tetrabutyl titanate The ester and 2.05g of diisobutyl phthalate were reacted at 130°C for 1 hour, and finally cooled to room temperature to form a homogeneous transparent solution, namely mixture I.

[0082] Add 200ml of titanium tetrachloride to the reaction kettle, stir and preheat to 0°C, add the mixture I dropwise to the titanium tetrachloride in about 2 hours. After the dropwise addition was completed, the temperature was raised to 110° C. within 2 hours. 1.23 g of diisobutyl phthalate, an internal electron donor, was added. After reacting at this temperature for 2 hours, remove the reaction liquid, add 200ml of titanium tetrachlor...

Embodiment 2

[0086] Ethylene homopolymer and its preparation

[0087] The preparation method of catalyst is the same as embodiment 1.

[0088] Slurry Polymerization of Ethylene:

[0089] Under the protection of high-purity nitrogen, dry and deoxygenate the 1L high-pressure reactor, add 150mL of n-hexane, 20mg of the above-mentioned catalyst and 12ml of triethylaluminum in sequence, and then feed ethylene gas to maintain 0.7MPa; among them, the content of carbon monoxide in ethylene Less than 5ppm, carbon dioxide is less than 15ppm, and the content of conjugated diene is less than 10ppm; the polymerization reaction starts, the system temperature is maintained at 70°C, and the reaction time is 30 minutes. The obtained catalyst activity and polyethylene properties are shown in Table 1.

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Abstract

The invention relates to ultrahigh molecular weight superfine polyethylene powder and a preparation method thereof. Polyethylene is greater than 1*106 in viscosity average molecular weight (Mv), and the polyethylene powder is spherical or sphere-like granules, having an average particle size of 10-100 Mum, a standard deviation of 2-15 Mum and a bulk density of 0.1-0.3 g / mL. The preparation method has simple steps, is easy to control and high in repeatability, and is suitable for industrialization. The powder of the invention has both ultrahigh molecular weight and superfine particle size range, is suitable particularly for processing and application, and is easy to graft-modify, and the applicable range of the ultrahigh molecular weight polyethylene materials is greatly widened.

Description

technical field [0001] The invention belongs to the field of polyolefin macromolecular materials, and in particular relates to a polyethylene powder with ultrahigh molecular weight and ultrafine particle diameter and a preparation method thereof. Background technique [0002] Ultra-high-molecular-weight polyethylene (UHMWPE) is a thermoplastic engineering with an average molecular weight greater than 1.5 million and a linear structure of molecules formed by low-pressure polymerization of ethylene and butadiene monomers under the action of a Ziegler catalyst. plastic. The extremely high molecular weight of UHMWPE (the molecular weight of high-density polyethylene HDPE is usually only 20,000 to 300,000) endows it with excellent performance, so that UHMWPE has unique properties that ordinary HDPE and some other engineering plastics do not have, such as excellent impact resistance. , wear resistance, chemical corrosion resistance, low temperature resistance, stress crack resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/649C08F4/02C08F2/34
CPCC08F110/02C08F2400/02C08F4/6494C08F4/022C08F2/34C08F2500/01C08F2500/18C08F2500/24
Inventor 李化毅李倩孙同兵朱才镇刘瑞刚赵宁徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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