UV spraying processing is UV curing by UV equipment, using UV ink or UV glue, spraying on the workpiece to be processed, and irradiating with ultraviolet light, a chemical reaction of the surface of the processed product to cause an instant curing.

The epoxy resin, acrylic resin and polyurethane are commonly used in UV spray processing. Although there are many components of the paint, the solvent in the paint is more obvious to the plastic substrate. It can be divided into esters, alcohols, ketones, ethers and the like according to chemical composition.

In the real vacuum plating UV primer processing, the solvent is often combined according to the solubility and specific requirements of the resin, so as to obtain a better spraying effect. And the same is paint, sometimes the performance of exterior paint and interior paint is different. This is because the thickness of the resin, solvent and lacquer used in the interior and exterior lacquers are different.

When UV spraying is applied, the resin for interior paint is usually made of polyurethane resin for high wear resistance, while the exterior paint is made of epoxy resin, acrylic resin, etc., which helps to improve the weather resistance and scratch resistance of the paint surface. Rubbing and so on.

Moreover, in the UV spraying process, the thickness of the exterior plastic paint layer is thicker than that of the interior, usually greater than 40 μm, while the interior plastic paint layer is usually above 15 μm. The thicker the lacquer layer, the stronger the adhesion required. At this time, it is necessary to select a slightly more corrosive solvent to ensure the connection between the lacquer layer and the substrate.