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Method for preparing polyolefin with ultra-high molecular weight

An ultra-high molecular weight, polyolefin technology, applied in the field of olefin polymerization, can solve the problems of unregulated chain entanglement, and achieve the effect of inhibiting the formation of chain entanglement

Active Publication Date: 2019-03-08
NINGBO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Firstly, nano-catalyst particles are prepared, and ultrasonic technology is used to ensure that the nano-catalyst particles do not undergo secondary agglomeration during the polymerization process, which avoids the entanglement of molecular chains growing between particles and particles. However, the chain entanglement inside a single catalytic particle knot still not adjustable

Method used

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  • Method for preparing polyolefin with ultra-high molecular weight
  • Method for preparing polyolefin with ultra-high molecular weight
  • Method for preparing polyolefin with ultra-high molecular weight

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing ultra-high molecular weight polyolefin, the steps are:

[0028] The reactor was purged with high-purity nitrogen to remove air and water in the reactor. Adjust the temperature of the reactor (slurry polymerization reactor) to 60°C, add 400ml of n-heptane, blow in nitrogen gas for 2bar, and add 2μmol of catalyst in sequence (select aryloxyimine ligand titanium-based single-site catalyst, that is, FI catalyst , of course, FI catalysts with other structures can also be used), 2000μmol cocatalyst (choose trimethylaluminoxane), 3bar olefin monomer (choose ethylene); before the reaction, the nitrogen in the solvent is assisted by ultrasonic waves into a diameter of 100nm~ 1000μm nano-microbubbles, and then start the polymerization reaction, the reaction pressure is 3bar, the reaction time is 2h, and the ultrasonic wave is assisted until the end of the polymerization reaction, wherein the ultrasonic frequency is 20KHz, and the ultrasonic power is 1kW. F...

Embodiment 2

[0031] A method for preparing ultra-high molecular weight polyolefin, the steps are:

[0032] The reactor was purged with high-purity nitrogen to remove air and water in the reactor. Adjust the temperature of the reactor (slurry polymerization reactor) to 60°C, add 400ml of n-heptane, blow in nitrogen gas for 2bar, and add 2μmol of catalyst in sequence (select aryloxyimine ligand titanium-based single-site catalyst, that is, FI catalyst ), 2000 μmol cocatalyst (select trimethylaluminoxane), 3bar olefin monomer (select ethylene); before the reaction, the nitrogen in the solvent is changed into nano-micro-bubbles with a diameter of 150nm by a nano-micro-bubble generator, and then the polymerization starts For the reaction, the reaction pressure is 60 bar, the reaction time is 2 hours, and the nano-microbubble generator is assisted until the polymerization reaction is completed. Finally, polyethylene pellets are obtained.

[0033] The weight-average molecular weight of the prep...

Embodiment 3

[0035] A method for preparing ultra-high molecular weight polyolefin, the steps are:

[0036]The reactor was purged with high-purity nitrogen to remove air and water in the reactor. Adjust the temperature of the reactor (slurry polymerization reactor) to 60°C, add 400ml of n-heptane, blow nitrogen gas at 2 bar, and add 2 μmol of catalyst (select aryloxyimine ligand titanium-based single active site supported by silica) in sequence Catalyst, that is, FI catalyst), 200μmol cocatalyst (trimethylaluminoxane is selected), 3bar olefin monomer (ethylene is selected); before the reaction, the nitrogen in the solvent is changed into a nano-micro bubble generator with a diameter of 150nm bubbles, and then start the polymerization reaction, the reaction pressure is 15bar, the reaction time is 2h, and the nano-microbubble generator is assisted until the polymerization reaction ends. Finally, polyethylene pellets are obtained.

[0037] The weight-average molecular weight of the prepared ...

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Abstract

The invention provides a method for preparing polyolefin with ultra-high molecular weight. The method is characterized by comprising steps as follows: step one, a solvent is added to a reactor; step two, inert gas is introduced into the solvent, and then the temperature of the reactor is adjusted to subzero 40 DEG C-100 DEG C; step three, a catalyst, a promoter and olefin monomers are added to thereactor in sequence; step four, the inert gas in the solvent is converted into nano-micro bubbles with diameter being 100 nm-1000 mu m, and a polymerization reaction is started; step five, after thereaction, polyolefin with weight-average molecular weight being 1,000,000-10,000,000 g / mol is obtained, and a ratio of initial storage modulus to platform storage modulus of polyolefin at 160 DEG C is0.05-0.70. Compared with the prior art, the competitive relation of chain crystallization and chain growth can be regulated and controlled in a nano-micro scale range, and formation of chain entanglement is inhibited; besides, the catalyst selectivity is wide, and the low entanglement characteristic of polyolefin can be guaranteed in a range of wider temperature.

Description

technical field [0001] The invention belongs to the technical field of olefin polymerization, and in particular relates to a method for preparing ultrahigh molecular weight polyolefin. Background technique [0002] Ultra-high molecular weight polyolefins are a class of polyolefins with a molecular weight greater than 1,000,000 g / mol. Taking ultra-high molecular weight polyethylene (UHMWPE) as an example, the ultra-long molecular chain endows the material with excellent mechanical properties (super high modulus, impact and wear resistance, radiation resistance, corrosion resistance, etc.), making it a special polymer material It is used in the fields of military industry, national defense, medical equipment and marine engineering, and is an important strategic material for a strong country and a strong army. However, a large number of chain entanglements in UHMWPE primary particles limit the orientation, diffusion and relaxation behavior of molecular chains, which not only m...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F110/02C08F2/00
CPCC08F2/00C08F10/00C08F110/02C08F2500/01
Inventor 历伟王靖岱阳永荣黄正良蒋斌波
Owner NINGBO UNIV
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