Method for preparing graphene coating

Abstract

The invention discloses a method for preparing a graphene coating. The method comprises the following steps: performing covalent bond surface modification on amine organic molecules to obtain surface-modified graphene, adding the surface-modified graphene into a curing agent based on a two-component epoxy coating in order to obtain a graphene highly-stably-dispersed curing agent, mixing the curingagent with epoxy resin to form the graphene coating, coating the graphene coating, and allowing the modified graphene and the epoxy resin in a formed coating layer to be cured and crosslinked to obtain a graphene physical shielding structure or a three-dimensional network conductive structure in order to obtain a graphene coating layer. The method solves the problem of stable dispersibility of graphene in the coating, breaks through the interface bonding problem introduced by the addition of graphene to the coating layer, and lays a solid foundation for the construction of the high-density graphene physical shielding structure or the three-dimensional network conductive structure in the coating layer.

Description

technical field [0001] The invention relates to a preparation method of a graphene coating. Background technique [0002] Compared with the atmosphere, water and soil corrosion environment, the ocean is a harsh corrosion environment, and the corrosion of steel structures is more serious. my country is the largest shipbuilding country, as well as the largest production and sales country of anti-corrosion coatings. At present, the main types of heavy-duty anti-corrosion coatings are: epoxy, polyurethane, acrylic, fluorocarbon, rubber, organic (inorganic) silicon resin, polyester, etc. Urea elastomers, glass flakes and organic (inorganic) zinc-rich coatings, etc.; among them, epoxy coatings are the most widely used. For anti-corrosion coatings, the choice of pigments and fillers has a great influence on its performance. Commonly used scaly fillers with physical shielding effects mainly include: glass flakes, mica flakes, mica iron oxide, stainless steel powder, and zinc-aluminu...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the fact that there is no oxygen-containing functional group on the surface of graphene, the specific surface area is large, the interlayer van der Waals effect is strong, the dispersion in the coating (solvent and components) is poor, and agglomeration, sedimentation and delamination are easy to occur, which is not conducive to the physical properties of the coating. To solve the problem of the formation of shielding structure and conductive network structure, the stable dispersion of graphene in epoxy coatings is solved by surface modification of covalent bonds of organic molecules; for the lack of chemical bonding between graphene and coating components in the coating, the introduction of There are many interfaces, the bonding between the interfaces is poor, the diffusion path of the corrosive medium is not completely cut off, and its anti-corrosion properties cannot be fully exerted. The curing interaction between the diamine or polyamine organic molecules and the coating components occurs in the subsequent curing reaction. The joint reaction solves the problem of interfacial bonding introduced by the addition of graphene in the coating; for the use and expansion of graphene in epoxy series coatings, by adding graphene to a transparent, single-component curing agent instead of easy precipitation , the technology in the epoxy resin item with complex components, so as to effectively solve the problem of adding graphene in epoxy series coatings (anti-corrosion, conductive, solvent-free coatings, etc.), and improve the different properties of different functional coatings (anti-corrosion, conductive) performance) etc.

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