Waterborne coating and preparation method thereof

Abstract

The invention belongs to the field of coatings and relates to a waterborne coating and a preparation method thereof. The waterborne coating is prepared from a styrene-acrylic emulsion, water-soluble epoxy resin, water-soluble acrylic resin, iron oxide red, graphene, zinc oxide, barium sulfate, a conversion agent, a conversion promoter, a levelling agent, a defoaming agent, a dispersant, a thickener and water. The coating does not contain organic solvent, is environmentally friendly and pollution-free and has the characteristics of primer-topcoat combination and excellent physical and chemicalrust prevention and rust conversion functions, and the surface dry and hard dry time can be effectively shortened after ethyl ether is added finally.

Description

technical field [0001] The invention belongs to the field of coatings, and relates to a water-based coating and a preparation method thereof. Background technique [0002] Steel structure engineering is a structure mainly made of steel, which is one of the main types of modern industrial and architectural structures, but its easy to corrode characteristics have brought huge losses to the national economy. In order to protect steel from rust, a layer of paint is often applied to its surface. In the past, before using paint, the base material must be thoroughly derusted, and even the original color of the metal base must be exposed. Large-scale steel installations and facilities, such as oil storage tanks, iron frames, iron bridges, sluice gates, ships, etc., often can only be derusted by hand, which is not only labor-intensive and inefficient, but also difficult to remove rust. Small and medium-sized steel parts can be derusted by shot peening. Although the derusting effect...

AI Technical Summary

Problems solved by technology

Large-scale steel installations and facilities, such as oil storage tanks, iron frames, iron bridges, sluice gates, ships, etc., can only be derusted by hand, which is not only labor-intensive and inefficient, but also difficult to remove rust

Small and medium-sized steel parts can be derusted by shot blasting. Although the derusting effect is good, it is subject to various restrictions due to large dust, loud noise, serious environmental pollution and high labor costs.

With the development of industry, there are more and more projects such as steel bridges and large pipelines. The above rust removal methods are far from meeting the needs of the project. Therefore, it is necessary to develop a coating that can directly paint the surface of corroded steel.

[0003] The application number is 201410165201.7, which discloses a water-based antirust coating with rust and its preparation method, which consists of styrene-acrylic emulsion, water-soluble epoxy resin, water-soluble acrylic resin, iron oxide red, graphene, zinc oxide, barium sulfate, and conversion , conversion accelerator, leveling agent, defoamer, dispersant, thickener and water, the coating does not contain organic solvents, is environmentally friendly, non-polluting, has the characteristics of the bottom surface and excellent physical and chemical resistance The functions of rust and rust conversion are not only suitable for rust prevention on steel surfaces with rust, hard oxide skin or old paint film, but also suitable for rust prevention on rust-free steel surfaces. The preparation method is simple and the construction is convenient. The compounding of the agent enhances the binding force between the paint and the rust, and it can be directly painted on the rusty steel surface. It is suitable for various construction methods such as spraying, brushing and showering. The coating cost is low and can fully meet the needs of urban road facilities. , bridges, oil and gas pipelines, construction machinery equipment and ships, etc., but the surface dry time of this invention is 1.5 hours, and the actual dry time is within 24 hours, which is too long to meet the shipyard's painting use