Classification of rusty architectural coatings;
1, stable waterborne antirust coating
Stable waterborne coatings with rust rely on active pigments in the coatings to stabilize the rust layer. The reaction between reactive pigment and rust layer is a slow solid process, which generally takes 8 ~ 10 months to completely stabilize the rust layer. However, the water solubility of reactive pigments is large, and the binder relies on reactive resin to stabilize rust. Because resin molecules contain highly polar carboxyl groups, hydroxyl groups, phosphoryl groups, etc. They have strong wetting effect and hydrophilicity. In view of the above reasons, poor primer protection may cause early damage and fail to achieve a stable purpose. In order to solve this contradiction, it is very important to coat the intermediate protective layer on the primer for sealing. The stable waterborne rusty coating based on epoxy resin and polyamide or other curing agents has good properties and is suitable for objects with high corrosion resistance. Foreign countries have been used in ships, bridges, oil tanks and steel structure products.
2, conversion type water-based rust coating
The conversion water-based rust coating is suitable for the steel surface with uniform corrosion and no residual oxide scale and flaky thick rust (the old paint film should be removed for maintenance and repainting). It is characterized by quick action and timely application of antirust primer and topcoat to play a good protective role. During construction, if there is old paint on the surface, shovel it off. Brush coating should be used. Don't repeat it when brushing, just apply one layer, otherwise it will cause too much free acid and affect the quality of the coating. It must be pointed out that when using this kind of coating, it is necessary to apply another type of primer after putting it into use, and then apply intermediate paint and topcoat, otherwise the anticorrosion effect of the whole coating will be seriously affected.
3. Permeable water-based antirust coating
Because this coating has good permeability, it is suitable for the surface of old steel equipment with little chemical pollution, especially for riveting and bolting parts of equipment. The effect is very good, and it can play a protective role that ordinary coatings can't. Of course, the permeability of the coating itself is relative. When there are impurities with high activity in rust, or it is difficult to completely penetrate the thick rust layer, its permeability is greatly limited, and it is not easy to encapsulate all the rust, which makes it possible.
The above is the classification introduction of rusty architectural coatings. Rusty architectural coating is a kind of coating that can protect buildings from corrosion and rust, and can be used as a coating for intermediate layers and surfaces. When choosing rusty architectural coatings, we should choose according to the needs of the industry, because rusty architectural coatings are divided into three categories, and not all industries are suitable for one. If improperly used or not standardized, it may also lead to shortened building life and rusting of metal products.
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