Waterborne epoxy heavy anti-corrosion coating and preparation method thereof

Abstract

The invention relates to waterborne epoxy heavy anti-corrosion coating and a preparation method thereof. The invention belongs to the technical field of anticorrosive coating. The coating comprises afirst component and a second component, wherein the first component comprises, by weight, 1 part of a modified waterborne epoxy emulsion, 0.1 to 0.3 part of deionized water, 0.005 to 0.01 part of modified graphene, 1.15 to 1.56 parts of a pigment filler, 0.02 to 0.03 part of a defoaming agent, 0.01 to 0.02 part of a dispersing agent, 0.01 to 0.02 part of a leveling agent, 0.03 to 0.05 part of an anti-flash-rust agent, 0.03 to 0.05 part of a sterilizing agent and 0.01 to 0.05 part of a thickening agent. The coating has good physical and chemical properties, coatings can resist to 1-degree bending without cracks, the impact resistance is 50 cm, the adhesive force is larger than or equal to 10 MPa, and coatings can resist a 5% NaOH solution, a 5% H2SO4 solution and 5% NaCl for 30 days under the normal temperature condition without blistering, cracking and falling off.

Description

Technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, and specifically relates to a water-based epoxy heavy-duty anti-corrosion coating and a preparation method thereof. Background technique [0002] With the continuous strengthening of people's awareness of environmental protection, more and more attention has been paid to the development and use of environmentally friendly coatings. Water-based anti-corrosion coatings is a major development trend in the coating industry today, and the country is also vigorously promoting the development of water-based coatings. Compared with solvent-based coatings, water-based coatings greatly reduce the VOC content, and even reduce the VOC content to zero, which is a true "green" coating. [0003] Waterborne epoxy coatings are widely used because of their good handling properties, good adhesion to most substrates, and can be cured in room temperature and humid environments, but they also have defects. ...

AI Technical Summary

Problems solved by technology

First of all, due to the high surface tension of water, the wettability of water-based epoxy coatings to steel is poor, and problems such as shrinkage cavities and poor adhesion are prone to occur

Secondly, in the process of preparing water-based epoxy emulsion, a large number of hydrophilic groups are usually introduced into the resin segment, which will greatly reduce the cross-linking density of the water-based epoxy coating, thereby affecting the relationship between the coating and the substrate. Adhesion between

At the same time, the introduction of a large number of hydrophilic groups and the reduction of crosslinking density will lead to a decrease in the corrosion resistance of the coating.

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