How to prevent aging of colored steel coils

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2021-11-12

The use of colored steel coils for too long or if they are not used for a long time will lead to aging, and long-term engineering construction or storage will inevitably be exposed to sunlight. After long-term direct exposure to light, aging can occur, which is beyond people's defense. However, if people can prevent the rate of aging earlier in normal times, what should they do?

The use of colored steel coils for too long or if they are not used for a long time will lead to aging, and long-term engineering construction or storage will inevitably be exposed to sunlight. After long-term direct exposure to light, aging can occur, which is beyond people's defense. However, if people can prevent the rate of aging earlier in normal times, what should they do?

The first prerequisite for the aging or photochemical reaction of the colored steel coil is that the surface components of the colored steel coil can digest and absorb radiation; Secondly, when the radiation energy absorbed by molecular structure digestion exceeds the molecular structure bond energy, the color steel coil coating can be dissolved. Because the shorter the wavelength of the light source, the higher the kinetic energy it contains.

According to the basic theory, the embrittlement of color steel coil caused by air pollution is that the molecular structure of the coating digested and absorbed the kinetic energy of ultraviolet wave band in natural light that is higher than the bond energy of its molecular structure, resulting in the dissolution of the molecular structure of the coating. With the aging of polyurethane coatings, the base material itself gradually becomes missing, and the surface of the coating gradually becomes unsmooth and loses its luster. This type of missing base material ultimately leaves a relatively stable color paste object, which is left on the surface of the polyurethane coating in the form of an unbonded powder. This entire process is called delamination.

In general, polyester color steel coils with different coating thicknesses have very different anti-aging characteristics. The anti-aging ability of thin coated color steel coils is weak, and the anti-aging characteristics of all normal thin and thick coatings are relatively good.

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