If the Color Coated Galvanized Steel Roll is used for too long or not used for a long time,it may age. Why do you say that long-term construction or storage must be exposed to the sun? After a long period of exposure to light, aging will occur, which we can't avoid, but we can prevent the speed of aging in advance, so what should we do?
The first necessary condition for the aging or photochemical reaction of the color coated galvanized steel roll is that the surface component of the color coated galvanized steel roll can absorb the radiant energy; secondly, when the radiant energy absorbed by the molecule is greater than the molecular bond energy, the color coating roll coating can be degraded. The shorter the wavelength of the light, the higher the energy it contains.
According to the above theory, the aging of the color coated galvanized steel roll in the atmospheric environment is that the coating molecule absorbs the energy of the ultraviolet light band in the sunlight higher than the molecular bond energy thereof, resulting in degradation of the coating molecule. As the coating film ages, the base body gradually loses, and the surface of the coating gradually becomes rough and loses light. This loss of the binder ultimately leaves relatively stable pigment particles which remain as unbonded powder on the surface of the coating film, a process known as pulverization.
In summary, polyester coating rolls with different coating thicknesses have great differences in aging resistance, and the aging resistance of thin coating color coated galvanized steel rolls is poor, and the aging resistance of normal thickness coatings is relatively good.
Therefore, the method of reducing the production cost of the color coating roll by reducing the coating is not feasible, which will inevitably bring serious quality problems. At the same time, it also demonstrates from the side that the coating thickness of the foreign color-coated importer clearly indicates the coating thickness. necessity.
