There are surface treatment processes such as electroplating, oil spray, printing, water transfer printing, etc. in life, we should spray paint on the plastic surface. The purpose of plastic products spraying is to form a solid continuous coating on its surface and give play to its decorative, protective and other special functions. The crystallinity of plastic has a great influence on the adhesion of paint film. High crystallinity leads to poor adhesion of paint film, and low crystallinity leads to better adhesion of surface coating.
In addition, the surface energy of plastics is generally low (such as nylon, PP and other materials), which is not conducive to the adhesion of the coating, and the adhesion between the substrate and the coating is poor. The most direct impact of poor adhesion is paint falling off, which cannot achieve the effect required for surface treatment. The method to effectively improve the adhesion in the actual production of coating is to enhance the adhesion through the pretreatment process of the substrate. Generally, the common methods include corona, flame, grinding, adhesion promoter and so on. Compared with electroplating, grinding and other treatment methods, spraying a layer of Shengsheng treatment agent adhesion promoter between the substrate and the coating makes the process operation simpler, the effect more stable and controllable, Therefore, it is widely used in the coating industry.
