Several factors affecting UVLED deep photocuringread count [333] release time：2020-01-08 21:17:00
UV coating UVLED After irradiation, the photoinitiator is triggered to generate free radicals or ions. These free radicals or ions cross-link with the double bonds in the prepolymer or unsaturated monomer to form monomer genes. These monomer genes start a chain reaction to generate polymer solid ion molecules, and a complete curing process is completed. Let’s talk about several factors that affect its deep solidification.
1. The influence of UVLED energy
The main condition for deep curing by ultraviolet radiation is that molecules must absorb light quanta with sufficient energy to become excited molecules, decompose into free radicals or ions, and allow unsaturated organic matter to undergo chemical reactions such as polymerization, grafting, and cross-linking. reach for the purpose of solidification. The UVLED energy of the photoinitiator in the supplied UV coating exceeds or is insufficient for the required energy.
1. The UVLED cold light source energy required by the photoinitiator is not known, such as blindly excessive supply. This approach not only wastes energy, but also causes negative effects of excessive curing, such as explosion and reverse curing reactions.
2. When the UVLED energy is insufficient, the UVLED energy must be moderate, that is, neither excessive nor insufficient, to avoid complete curing.
2. The influence of UV coating thickness
The thickness of the UV coating plays a key role in the effect of UV curing. If the coating is too thick, the drying time will be relatively long under the irradiation of the same power light source. On the one hand, it will affect the drying of the UV coating, and on the other hand, the surface temperature of the substrate will be too high. guide Cause deformation of the base material; coating that is too thin will result in poor surface gloss of the product. In addition, the thickness of the UV coating, the hue of the paint, Appropriate preparation is required under different conditions such as temperature, curing speed, and substrate surface.
3. The influence of curing distance The UV lamp generally has a distance of about 10-15mm depending on the curing substrate. The curing distance must be appropriately adjusted according to the base material, coating, and irradiation power of the UVLED lamp.
4. The influence of UV light curing speed
Depending on the substrate, coating, curing distance, etc., adjust the equipment curing speed appropriately. If the curing speed is too fast, the UV coating on the surface of the substrate will become sticky or dry on the surface but not inside; if the operation speed is slow, the surface of the substrate will age.
5. Influence of working environment
When the viscosity of UV coating changes greatly due to temperature, the room temperature should be adjusted, generally 15-25°C is more suitable, and attention should be paid to not being exposed to direct sunlight during curing.
