Coating as well as preparation method and application thereof

Abstract

The invention relates to coating. The coating is prepared from a component A and a component B according to the mass ratio of (4 to 10) to 1, wherein the component A is prepared from 0.5 to 3 weight percent of a graphene material, 20 to 40 weight percent of zinc powder, 20 to 30 weight percent of epoxy resin, 0.5 to 3 weight percent of a dispersant, 3 to 6 weight percent of an anti-sedimentation agent, 10 to 30 weight percent of filler and 20 to 30 weight percent of an organic solvent; the component B is prepared from 40 to 60 weight percent of polyamide, 2 to 6 weight percent of a curing accelerant, 25 to 38 weight percent of epoxy resin and 14 to 26 weight percent of an organic solvent. According to the coating provided by the invention, the epoxy resin is introduced into the component Bin traditional double-component corrosion-resisting coating, and a corresponding component ratio and a grain diameter ratio of the graphene material to the zinc powder are preferred so that the prepared coating has a smooth coating layer surface and does not have phenomena of wrinkles, cracks, air bubbles and the like; the adhesive power of a coated surface is remarkably improved to grade 0 and the salt spray resistance can be further improved to be 3000h or more; the coating has relatively high impact strength and strong acid-alkali stability and is very suitable for being used as a corrosion-resisting coating layer on the surface of a metal material.

Description

technical field [0001] The present invention relates to a kind of coating formula and its preparation method and application Background technique [0002] Corrosion effect, especially the corrosion of metal materials has a great influence on the service life of materials. The corrosion of metal materials is mainly divided into two types: chemical corrosion and electrochemical corrosion. Chemical corrosion mainly refers to the reaction between acid or alkali and active metal surface , dissolve the oxide layer on the metal surface, and further erode the metal substrate. Chemical corrosion is usually faster, but it can usually be prevented by mixing corrosion-resistant alloys into the metal material or completely covering the outer surface of the metal material. Electrochemical corrosion refers to the process of galvanic reaction between oxygen or other oxidants and metal materials in the presence of electrolyte to obtain metal cations and reduction products. Common electrochem...

AI Technical Summary

Problems solved by technology

Traditional zinc-rich primer paint, such as the disclosed two-component epoxy zinc-rich primer of CN101407690A, consists of the first component containing epoxy resin, zinc powder, filler, anti-settling agent, solvent and by containing curing agent and solvent Component B is mixed at a mass ratio of 8:1 to 15:1. Its performance is poor, the salt spray resistance time is only 72 hours, and a large amount of zinc powder is required, which makes the surface of the coating rough and the adhesion is reduced.

In order to improve the salt spray resistance performance of the coating, the prior art adds corrosion-resistant and strong interactive additives such as graphene to the coating, for example, CN105086758 discloses a kind of graphene anti-corrosion coating and its preparation method, through the Graphene is introduced into the disclosed components, and the physical protection effect provided by the good flexibility and high aspect ratio of graphene is used to obtain a paint film with a lower thickness, less zinc powder content, and an impact strength of 40g cm. Graphene anti-corrosion coating with salt spray resistance of 500-1000h, but its adhesion is weak, only level 2

CN105623473A discloses a zinc-containing graphene anticorrosion primer of a similar technology graphene dispersion, wherein by selecting an epoxy resin with an epoxy value of 0.25 to 0.37 and a diameter of 5 to 30 μm, the number of layers is less than or equal to 10 layers, Graphene sheets with an oxygen content of less than 15% are mixed with other components to obtain component 1, and the preparation method of the two-component corrosion-resistant coating is improved, and a surface resistance of 10 is obtained. 6 ~10 11 Ω paint film, delays the occurrence of electrochemical corrosion by increasing the surface resistance, but does not give a technical solution on how to improve the surface adhesion of the material

Images