Photoinitiator - How to improve adhesion of UV metals to coatings?

UV coatings refer to coatings cured by UV radiation. UV-curable coatings can be used for ink printing and exposure to UV irradiation. Its solid content can be up to 100%, so there is no volatile components and no pollution to the environment. The high solid content also allows it to be used in very thin films. UV curable coatings can also be applied to coated glass and plastic, wood, aluminum beverage bottles, etc. 

UV coating application for metal substrate often encountered problems is coating adhesion to metal is not good, in order to achieve the ideal adhesion need to add adhesion to promote the function of additives, due to the metal substrate surface dense UV coating is difficult to penetrate absorption, its effective contact surface is less. Other substrates such as: paper, wood surface and etc.

In addition, with UV coating rapid curing, volume shrinkage of the internal stress can not be released, the reaction on the film layer on the metal substrate adhesion, so that the adhesion decreased. The metal surface is often easily stained by grease, which is not conducive to coating adhesion and metal corrosion. The core problem of UV metal coating is to solve the adhesion of coating and metal, coating formula oligomer and active diluent can form hydrogen or chemical bonds with the metal surface, can greatly improve the adhesion of coating and metal, containing carboxyl and hydroxyl oligomer and active diluent on metal substrate effect is significant, The selection of reduced volume oligomer and active diluent is also beneficial to improve the adhesion.