How should we choose the color of color-coated rolls?

Color-coated rolls come in a variety of colors. How do you choose the color that suits you among the many color-coated rolls? To avoid large color differences, let us take a look at it together.

Selection of coating color for prepainted boards: The choice of color is mainly based on matching with the surrounding environment and the user's preferences. However, from a technical point of view, there is a wide range of pigment choices for light-colored coatings, and inorganic pigments with superior durability can be selected. (Such as titanium dioxide, etc.), and the coating has strong heat reflection ability (reflection coefficient is twice that of dark coating). The temperature of the coating itself is relatively low in summer, which is beneficial to extending the life of the coating. In addition, the editor reminds that even if the coating of the color-coated roll changes color or powders, the contrast between the light-colored coating and the original color will be small, and the impact on the appearance will not be significant. Dark colors (especially bright colors) are mostly organic colors, which are easy to fade when exposed to ultraviolet rays, and can change color in as little as 3 months. For color-coated steel plates, usually the thermal expansion rates of the coating and the steel plate are different, especially the linear expansion coefficients of the metal substrate and the organic coating are quite different. When the ambient temperature changes, the bonding interface between the substrate and the coating will change. Expansion or contraction stress occurs, and if not properly relieved, coating cracking will occur. In addition, here we would like to explain two misunderstandings about the current selection in the domestic market: One is that there are currently a large number of white primers in the country. The purpose of using white primer is to reduce the thickness of the topcoat, because the normal corrosion-resistant primer for construction is yellow-green (hence the strontium chromate pigment), and the topcoat must be thick enough. The second is the color-coated steel plates used in construction projects. The same project uses color-coated steel plates from different manufacturers and different batches. The colors seem to be consistent during construction, but after several years of sunlight exposure, the colors of different coatings and manufacturers change. There are too many examples of different trends leading to serious color differences. Even if the products are from the same supplier, it is strongly recommended to place an order for the same project at once, because different batch numbers may use products from different coating suppliers, increasing the possibility of color difference.