Method for preparing polyethylene wax containing phenoxy group at chain end by thermal degradation

Abstract

The invention discloses a method for preparing polyethylene wax containing phenoxy group at the chain end by thermal degradation, which comprises the following steps: evenly mixing hydroquinone and polyethylene granules in a mass ratio of (1-4):100 into a high-pressure reaction kettle, introducing nitrogen to raise the pressure in the kettle to 0.4-0.6MPa, raising the temperature in the kettle to200-210 DEG C, and controlling the stirring rate at 50-80rpm; continuing heating to 330-380 DEG C, reacting at the constant temperature to react for 0.5-5 hours while keeping the pressure in the kettle below 1 MPa, and stopping heating; and stopping stirring when the temperature in the kettle drops to 190-200 DEG C, taking out the melt when the temperature in the kettle drops to 160-180 DEG C, and pulverizing the melt after the temperature in the kettle drops to room temperature, thereby obtaining the product. Since the oxygen-free thermal degradation technique of hydroquinone and polyethylene is utilized, long-chain free radicals generated by gradual chain ruptures in the hydroquinone free radical and polyethylene degradation process is coupled and terminated in time by loss of hydrogen to obtain a low-molecular-weight polyethylene wax with a phenoxy group at one end or phenoxy groups at two ends, thereby providing a new optional species for the application field of polyethylene wax.

Description

technical field [0001] The invention belongs to the technical field of preparation of polyethylene waxes containing specific functional groups at chain ends, in particular to a method for preparing polyethylene waxes containing phenoxy groups at chain ends, and in particular to an anaerobic thermal degradation of polyethylene bulk with hydroquinone participation A method for preparing polyethylene waxes containing phenoxy groups at chain ends. Background technique [0002] The efficient recycling of plastics is the trend of future development, which can not only avoid environmental pollution, but also make full use of resources. As an important and efficient recycling method, thermal degradation has always been a hot spot in theoretical and applied research. Polyethylene is one of the most widely used plastic varieties. More new material products with unique properties and high application value can be obtained through thermal degradation of polyethylene, so it has great pr...

AI Technical Summary

Problems solved by technology

In this solution thermal degradation reaction, although the presence of the solvent is conducive to the transfer of heat and makes the molecular chain of the product more uniform, the remaining solvent tetrahydronaphthalene needs to be removed after the reaction, making the process more complicated and difficult to completely remove. Unfortunately, the reaction process consumes a large amount of solvent, which not only leads to higher costs, but also easily causes environmental pollution.

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