A kind of graphene/nano titanium dioxide composite material and its preparation method and application

Abstract

The embodiment of the present invention provides a graphene / nano-titanium dioxide composite material and its preparation method and application, belonging to the technical field of composite material preparation. By making a suspension of nano-titanium dioxide and a polar solvent, the graphene precursor is added dropwise into the suspension by slow dropwise addition to obtain a composite of graphene and nano-titanium dioxide, which is obtained by reducing it under an inert atmosphere. Graphene / nano-titanium dioxide composite material, the preparation process of this method is simple, the batch production cycle can be shortened to several hours, and the reaction is mild, safe, and more suitable for industrial production; at the same time, nano-titanium dioxide and graphite oxide are added through a suitable polar solvent The binding force of ene ensures that the graphene / nano-titanium dioxide composite does not separate under strong mechanical action, improves the dispersion of the graphene / nano-titania composite, and when the material is applied to marine anti-fouling and anti-corrosion coatings, it improves Coating stability and service life.

Description

technical field [0001] The invention relates to a graphene / nano titanium dioxide composite material and a preparation method and application thereof, belonging to the technical field of composite material preparation. Background technique [0002] In recent years, with the vigorous development of the marine transportation industry, the output of ocean-going cargo ships and cruise ships has increased year by year. However, with the extension of ship routes and the prolongation of the voyage cycle, marine organisms continue to gather on the surface of ships for a long time, and there are various types and large quantities of them. Breeding, causing ship surface fouling, which will not only reduce the speed of the ship, reduce maneuverability, increase fuel consumption, but also produce organic acids during the biofouling process, which will intensify the corrosion of ships, seawater desalination equipment and underwater facilities . Fouling and corrosion not only reduce the s...

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Problems solved by technology

[0005] In the prior art, there are mainly two ways to prepare graphene / titanium dioxide nanocomposites. One is to first prepare titanium dioxide by hydrolysis of titanium salt, and then react with graphene oxide. For example, the preparation method disclosed in Chinese patent application CN104388923A, the method The crystal phase composition of titanium oxide in the prepared graphene oxide / titanium dioxide composite powder is anatase and brookite structure, which can effectively improve the electron transfer efficiency in the process of titanium oxide photocathodic protection, but the reaction time is long (ten Several hours), and most of the time needs to be carried out at about 100°C, so the preparation needs to be completed in a reactor, which consumes energy, is costly, and has potential safety hazards during large-scale production; Graphene / titania nanocomposites are prepared by surface hydrolysis of alkene, such as the normal temperature preparation method of a titania / graphene nanocomposite disclosed in Chinese patent application CN104998630A, the titania particle size prepared by this method is small, evenly distributed, and the preparation process is simple. Low energy consumption, but the reaction time is too long (up to several days), which is not conducive to industrial production

The Chinese patent application CN106423129A discloses a method for preparing graphene-supported titanium dioxide by a hydrothermal method. After the preparation is completed, large-scale production consumes energy, is costly and has potential safety hazards

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