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Metallocene catalyst and preparation method thereof, and preparation method of polyethylene nanofiber

A metallocene catalyst and metallocene technology, applied in the direction of single-component polyolefin artificial filaments, etc., can solve the problems of high melting point of polyethylene, cumbersome processing, and increased industrial costs

Active Publication Date: 2014-09-03
芜湖万隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the metallocene catalyst supported by the carrier can solve many problems encountered in the application, if one wants to obtain nanofibrous polyethylene, cumbersome subsequent processing is still required, which increases the industrial cost, even so , the melting point of polyethylene obtained after processing is not high, which limits its application

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  • Metallocene catalyst and preparation method thereof, and preparation method of polyethylene nanofiber
  • Metallocene catalyst and preparation method thereof, and preparation method of polyethylene nanofiber

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[0040] The present invention also provides a method for preparing the above-mentioned metallocene catalyst, comprising: mixing porous polymer microspheres, aluminoxane compound and the first organic solvent, heating and stirring to react, then adding metallocene, continuing to heat and stir to react, obtain a metallocene catalyst;

[0041] The porous polymer microsphere contains N element;

[0042] The aluminoxane compound is methylalumoxane and / or modified methylalumoxane;

[0043] Described metallocene is shown in formula (I):

[0044] (Cp) x TiCl y (I);

[0045] Wherein, x is 1 or 2, y is 2 or 3, Cp is a cyclopentadiene group or a cyclopentadiene group derivative, and the cyclopentadiene group derivative is methylcyclopentadienyl group or ethylcyclopentadiene group.

[0046] The porous polymer microspheres are the same as those described above, and will not be repeated here.

[0047] According to the present invention, the porous polymer microspheres are preferab...

Embodiment 1

[0063] 1.1 Store 1 g of porous polymer microspheres (polystyrene, divinylbenzene and acrylonitrile copolymer) with an average pore diameter of 9.05 nm and a size of 3.87 μm in vacuum at 80°C for 15 hours, cool to room temperature, and add to In the 100ml Schlenk type filter reactor treated under water anaerobic conditions, add 20ml toluene with a syringe, then add modified methylalumoxane according to Al / N=7, and stir the reaction at 50°C for 12h Invert the filter for suction filtration, wash with toluene 3 times to remove excess modified methylalumoxane, and then add a certain amount of Cp 2 TiCl 2 Toluene solution (Cp is a cyclopentadiene group; Al / Ti=50), add an appropriate amount of toluene, stir magnetically at 50°C for 12 hours, then invert the reactor for suction filtration, wash 5 times with toluene, and The solid was vacuum-dried and transferred to an ampoule, and the whole operation was carried out under anhydrous and oxygen-free conditions to obtain a metallocene c...

Embodiment 2

[0068] In a 0.1L stainless steel autoclave, nitrogen was replaced 3 times, and then 20ml of n-hexane was added. With the addition of n-hexane, the cocatalyst modified methyl aluminoxane was added, followed by the addition of 6.82μmol1.1 of the metallocene Catalyst, the molar ratio of Al in the modified methylaluminoxane to the Ti of the metallocene catalyst is 5100:1, after the temperature is raised to 50°C, ethylene is introduced into the reaction kettle, the reaction pressure is 3 atm, the reaction time is 30min, and the reaction After the end, the polyethylene particles are collected, filtered, and dried to obtain polyethylene nanofibers.

[0069] The polyethylene nanofibers obtained in Example 2 were analyzed by differential scanning calorimetry, and its secondary melting point was found to be 141.4°C.

[0070] The polyethylene nanofibers obtained in Example 2 were analyzed using a scanning electron microscope, and it was found that they had independent nanofiber structure...

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Abstract

The invention provides a metallocene catalyst and a preparation method thereof, and a preparation method of polyethylene nanofiber. The metallocene catalyst is formed by loading metallocene on porous polymeric microsphere through an aluminoxane compound, wherein the aluminoxane compound is methyl aluminoxane and / or modified methyl aluminoxane; the metallocene is represented as a formula (I) in the specification, wherein x is 1 or 2, y is 2 or 3, Cp is a cyclopentadiene group or a cyclopentadiene group derivative, and the cyclopentadiene group derivative is a methyl cyclopentadiene group or an ethyl cyclopentadiene group. Compared with the prior art, the metallocene catalyst has the advantages that the porous polymeric microsphere are used as carrier by the metallocene catalyst, and the porous polymeric microsphere is of a hierarchical pore structure, so that the molecular chain in the polymer product can only grow along the pore canal direction, and the growth in other directions is inhibited so as to obtain a fibrous product, the entanglement of the molecular chains is caused in the existence of hierarchical pores, the movement of the molecular chains is obstructed, and thus the melting point of the obtained polymer is increased.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a metallocene catalyst, a preparation method thereof, and a preparation method of polyethylene nanofibers. Background technique [0002] As an important index of polyolefin resin properties, melting point and morphology have a certain influence on the use and processing of the product. In order to improve the performance of polyethylene and expand its application fields, people continue to use various methods to adjust its melting point to meet the needs of polyethylene products in different fields. [0003] At present, as a general-purpose polymer product, polyethylene has formed products such as low-density polyethylene, high-density polyethylene, linear low-density polyethylene, ultra-high molecular weight polyethylene, and metallocene polyethylene with controllable molecular weight and branching. And with its excellent performance, it has become one of the vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/6592C08F4/02D01F6/04
Inventor 周光远王魁雷金化聂赫然
Owner 芜湖万隆新材料有限公司
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