Thick coating type aqueous epoxy zinc-rich anticorrosive coating material and preparation method thereof

Abstract

The invention relates to the technical field of coating materials, particularly to a thick coating type aqueous epoxy zinc-rich anticorrosive coating material and a preparation method thereof, whereinthe thick coating type aqueous epoxy zinc-rich anticorrosive coating material comprises a component A and a component B, the component A comprises, by mass, 5-10 parts of a curing agent, 0.5-2 partsof a dispersing agent, 0.05-1 part of a defoaming agent, 0.5-5 parts of a thixotropic agent A, 0.5-5 parts of a thixotropic synergist BYK-P 2720, 60-83 parts of zinc powder, and 8-20 parts of a cosolvent, and the component B comprises, by mass, 55-80 parts of an epoxy resin emulsion, 10-35 parts of water, 5-10 parts of a thixotropic agent B, and 5-10 parts of a thixotropic blocking agent BYK-P 2710. The thick-coating type waterborne epoxy zinc-rich anticorrosive paint disclosed by the invention has excellent sagging resistance, adhesive force, salt spray resistance and impact resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a thick-coated water-based epoxy zinc-rich anticorrosion coating and a preparation method thereof. Background technique [0002] Traditional industrial coatings contain a large amount of organic co-solvents. During the construction and drying process, the organic co-solvents in the coatings are volatilized and cause pollution, which endangers human health and is also a waste of resources. Statistics show that the total amount of VOCs volatilized during the coating process of steel products and their facilities accounts for about 20% to 25% of the total global VOCs, and has become one of the main sources of air pollution. Therefore, the use of water-based coatings instead of solvent-based coatings in the field of industrial protection has very important practical significance for my country to build a harmonious society and achieve sustainable economic development. [0003] Wate...

AI Technical Summary

Problems solved by technology

When making paint, it is necessary to add a suitable thixotropic agent to component A to increase the viscosity of component A and prevent zinc powder from settling. At this time, component A is an organic co-solvent system. During construction, the two components are mixed and transformed into water Phase system, the thickening and anti-sedimentation effect of the thixotropic agent in the original co-solvent phase is destroyed, it is necessary to introduce a new water-phase thickening and anti-sedimentation system, and at the same time, it is necessary to take into account the thixotropy. coating application requirements, resulting in sagging

[0005] At present, the water-based epoxy zinc-rich coating products on the market can only meet the construction requirements of dry film thickness of 30-60 μm. This film thickness can meet the requirements of mild and medium corrosion. It has been promoted and applied in the container coating industry. However, for the heavy-duty anti-corrosion field, the thickness of the water-based epoxy zinc-rich coating needs to reach more than 80 μm, and the conventional water-based epoxy zinc-rich coating will sag during spraying construction, which cannot meet the construction requirements of thick coating

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