Preparation of layered double hydroxide/graphene oxide (LDH/GO) hybrid material and application of hydrotalcite/graphene oxide hybrid material in coatings

Abstract

The invention discloses a layered double hydroxide-graphene oxide (LDH-GO)/waterborne epoxy composite material. A preparation method of the composite material comprises the following steps: (1) preparing PO4<3->-LDH; (2) preparing PO4<3->-LDH/GO nano-dispersion liquid; (3) preparing an aqueous coating base material; (4) preparing a PO4<3->-LDH/GO/epoxy composite coating. The PO4<3->-LDH/GO hybridmaterial prepared by means of simple ultrasonic treatment and an electrostatic interaction between GO and LDH has good dispersibility; in addition, the prepared nano-aqueous epoxy composite coating has a function of secondary protection due to release of phosphate between LDH layers, so that the corrosion resistance of the prepared coating is much better than that of the traditional water-based coating; furthermore, the method has the advantages of being simple to operate, low in energy consumption, low in equipment requirements, environmentally-friendly, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite materials and coatings, and in particular relates to the preparation of a hydrotalcite / graphene oxide hybrid material and its application in coatings. Background technique [0002] Due to the low content of volatile compounds (VOCs) that are harmful to human health and the environment, environmentally friendly waterborne epoxy coatings have attracted more and more attention; however, unfortunately, compared with traditional organic solvent-based coatings, waterborne epoxy coatings Oxygen coating due to its resistance to corrosive media (H 2 O, O 2 and Cl - ) poor barrier performance, which limits its application in the field of heavy-duty anti-corrosion; at present, the commonly used method to improve the barrier performance of coatings is to add some nano-fillers with anti-corrosion properties in the coating matrix. [0003] Graphene (Gr) has long been considered as a promising two-...

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Problems solved by technology

[0002] Due to the low content of volatile compounds (VOCs) that are harmful to human health and the environment, environmentally friendly waterborne epoxy coatings have attracted more and more attention; however, unfortunately, compared with traditional organic solvent-based coatings, waterborne epoxy coatings Oxygen coating due to its resistance to corrosive media (H 2 O, O 2 and Cl - ) poor barrier performance, which limits its application in the field of heavy-duty anti-corrosion; at present, the commonly used method to improve the barrier performance of coatings is to add some nano-fillers with anti-corrosion properties in the coating matrix

[0003] Graphene (Gr) has long been considered as a promising two-dimensional (2D) carbon material for its 2 O, O 2 and Cl - Corrosive media such as Gr has high barrier properties, so it can be used as a physical barrier of the coating, and it is a potential candidate material in the field of anti-corrosion; however, due to the strong hydrophobicity of Gr itself, it is difficult to disperse in aqueous solution, Therefore, its wide application in water-based coatings has been difficult to achieve; a common method to improve the dispersibility of Gr in water is to obtain graphene oxide (GO) through the modified Hummers method, and the oxygen-rich functional groups on the surface of GO make GO easy to dissolve in aqueous solution. Dispersed and more prone to chemical functionalization, thereby enhancing the interfacial interaction between GO and the resin matrix; a large number of studies have proved that GO plays an increasingly important role in the field of corrosion protection; but chemical oxidation in conjugated graphene Defect sites are also introduced into the structure, which greatly damages the long-term corrosion resistance of graphene

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