Water-based two-component epoxy anticorrosive paint for storage tank welding seam and preparation method thereof

Abstract

The invention discloses a water-based two-component epoxy anticorrosive paint for a storage tank welding seam and a preparation method thereof. The anticorrosive paint comprises a component A and a component B. The component A accounts for 70%-96% of the total weight of the epoxy anticorrosive paint, and the component B accounts for 4%-30% of the total weight of the epoxy anticorrosive paint. During use, the component A and the component B are evenly mixed and then used within several hours; water-borne epoxy resin is adopted as a paint monomer, after the water-borne epoxy resin is modified through modified reduced graphene oxide, the isolation performance of a coating formed by the paint is improved, functional filler is further added into the paint, the functional filler can have the effects of pigment, filler and a corrosion inhibitor, such that the strength and the corrosion resistance of the anticorrosive paint are improved, the tetrasodium hydroxyethylidene-1, 1-diphosphonate in an anti-flash rust agent can react with a variety of metal ions to generate a complex so as to achieve the corrosion inhibition effect, and the sodium lignin sulfonate can achieve the effects of dispersion, enhancement and anti-flash rust.

Description

Technical field[0001]The present invention belongs to the field of environmentally friendly coatings, and in particular, the aqueous double-component epoxy anti-corrosion coating and preparation method thereof are related to a tank weld.Background technique[0002]In order to reduce the corrosion rate of the metal, it is necessary to coat the metal surface, but this can only reduce the corrosion of the metal without completely avoiding the corrosion of the metal, in the actual application, the corrosion of the metal is mainly from the start of the weld, which main It is because during the welding process, the heat affected zone generated during the weld metal and the welding process causes the metal component at the weld during the melting, thereby generating potential difference, generating electrochemical corrosion, additional, anti-corrosion coating at weld Due to factors such as stress and structural effects, the coating of other locations is more easily cracking, resulting in the...

AI Technical Summary

Problems solved by technology

[0002] In order to reduce the corrosion rate of the metal, it is necessary to carry out coating treatment on the metal surface, but this can only slow down the corrosion of the metal and cannot completely avoid the corrosion of the metal. In the actual application process, the corrosion of the metal mainly starts from the weld, which is mainly It is because during the welding process, the weld metal and the heat-affected zone generated during the welding process are different in the metal composition of the weld due to the melting process, resulting in a potential difference and electrochemical corrosion. In addition, the anti-corrosion coating at the weld Due to factors such as stress and structural influence, the coating at other positions is more prone to cracking, which causes the coating at this position to lose its protective effect on the weld;

[0003] However, in the prior art, there is no special coating for welds. When carrying out anti-corrosion treatment on the metal surface, the welding seam is mainly processed, and then the metal surface is sprayed with paint, that is, the welding seam and the non-welding joint. The coating at the seam is not distinguished, but due to the different metal properties and surface properties at the weld, the metal at the weld is more likely to corrode, and the coating at the weld is prone to corrosion due to stress due to various factors such as thickness and bonding effect. Cracks occur, which in turn causes the coating at the weld to lose its protective effect on the weld; the barrier performance of the coating is one of the important parameters for evaluating the performance of the coating. In the prior art, it is mainly through adding mica flakes to the coating. However, due to the relatively large specific surface area of ​​mica flakes and other materials, it is necessary to control the amount of addition in actual use, and when the amount of mica flakes is reduced, it will affect the barrier properties of the coating. In order to solve Problems referred to above, the present invention provides the following technical solutions