UV vacuum plating coating is mainly composed of UV curing resin, monomer, photoinitiator, coloring agent, leveling agent, adhesion promoter, etc., according to the application of division of labor, mainly by UV vacuum plating primer and UV vacuum plating topcoat Composition, in order to match the modern new plating technology, some also have a vacuum plating coating.

The role of the primer UV vacuum coating primer is a coating applied on the surface of a plastic substrate, its function is to close the plastic substrate to prevent volatile substances in the substrate from affecting the quality of the coating during vacuum plating. The plastic surface is rough, and a smooth and smooth mirror effect can be obtained by primer coating, which is beneficial to obtain a thicker and more uniform vacuum metal coating, exhibiting higher metallic luster and reflection. For some less polar substrates, the vacuum-plated metal coating can achieve better adhesion through the primer transition. For some plastic substrates with poor heat resistance, the primer also plays a certain thermal buffering effect.

Vacuum plating UV primer requirements The above functions of UV vacuum coating primers require that the primer must have good adhesion to the plastic substrate and the vacuum coated metal layer, that is, the coating should be both good and weakly polar. The plastic substrate adheres well and has good adhesion to polar metals. This is higher than the requirements of pure plastic coatings. It also proves that most of the UV vacuum plating resins are equally applicable or higher than those suitable for simple use. UV plastic coating.

At the same time, in order to ensure the high gloss and mirror effect of the metal coating, the primer must have very good leveling properties. In addition, there should be no volatile small molecules after the primer is cured, otherwise the quality and performance of the metal coating will be destroyed, so the large molecular weight of the primer formulation is also an important consideration. For some heat resistant substrates, UV primers are also very important in combination with their heat resistance, such as BMC's heat resistance requirements of 180 °. In addition, in order to prevent cracking or detachment of the coating, the flexibility of the primer system is also particularly important.

The formulation of the primer is based on the performance requirements of the UV vacuum coating primer. The primer formulation should take into account the flexibility, leveling, adhesion and molecular weight in the selection of the oligomer. Therefore, in order to meet these needs, generally use two. The trifunctional urethane acrylate resin is the main resin, such as the popular 6158 and UA202. In addition, considering the cost and performance factors, a certain epoxy resin or polyester is generally used. The monomer is generally given priority by TP. It is considered that the initiator is non-long wavelength preferred, and an appropriate amount of phosphate and adhesion promoter may be added as appropriate.