The shrinkage of color coating plate refers to the phenomenon that small pits are formed on the surface of color coating roll after the paint is baked. The reason of shrinkage is that too high surface tension of the coating will cause shrinkage of the
coating film. In the practical application of the coating, this problem is relatively common, mainly because the wettability of the coating to the substrate is not good. If the surface tension of the coating is too large to make the wet film form
a uniform coating before drying, it will cause the substrate to be exposed in serious cases, thus forming the shrinkage phenomenon. Generally, the shrinkage phenomenon is more.
Causes of shrinkage of color coated plate and Solutions
The first is to clean the surface of the color coated plate as much as possible before the coating, so as to reduce the impact of oil, dust and other debris on the coating performance;
The other is to use a surface tension control agent or
some solvent with good wetting effect to reduce the surface tension of the coating, so that its size is close to the free performance of the substrate surface.
Color coatin roll is a product made of hot-dip galvanized plate, hot-dip aluminum zinc
plate, electro galvanized plate, etc. after surface pretreatment (chemical degreasing and chemical conversion treatment), one or several layers of organic coating are applied on the surface, and then baked and solidified. Also because there are different
colors of the organic coating color steel coil plate from this name, referred to as color coated coil. In addition to the protection of zinc layer, the organic coating on the zinc layer plays a role in covering and protecting the color coated steel strip
with hot-dip galvanized steel strip as the base material, preventing the steel strip from rusting, and the service life is about 1.5 times longer than that of the galvanized steel strip. Color coated roll has light weight, beautiful appearance and good
anti-corrosion performance, and can be processed directly. The color is generally divided into gray white, sea blue and brick red, which are mainly used in advertising, construction, home appliance, electrical appliance, furniture and transportation industries.
Polyester: good adhesion, rich color, wide range in molding and outdoor durability, medium chemical resistance, low cost.