Contrast Thermal Curing of UV-LED

UVLED curing is generally free radical curing. There are initiators that produce free radicals under UV light. Thermal curing is the curing of two or more substances which need to be heated or at a certain temperature. The curing method is different. In terms of properties, UV curing has good physicochemical properties, high transparency and high productivity, but under some conditions the adhesion is not ideal. Thermally cured adhesives have good flexibility and adhesion.

 

 

 

UV curable resins contain double bonds, such as epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate, acrylate esterified polyacrylate and unsaturated polyester resins, as well as various acrylate monomers with single or multiple functional groups, which can be induced by ultraviolet photons. The photon energy transmitted by the initiator produces free radicals, which initiate the polymerization and crosslinking of these oligomers at room temperature.

 

 

 

The film-forming substance of coatings is resin, which needs to be adhesively bonded. In addition to evaporating small molecules and solvents, the cross-linking of coatings itself is that chemical bonds produce cross-linking to form films. The monothermal curing is thermal curing, and the UV LED curing is that the groups and valence bonds in the resin are crosslinked by ultraviolet light (of course, the UV system is slightly more complex, he also needs photoinitiator to initiate, otherwise the natural ultraviolet light crosslinking is very slow).

 

 

 

The curing mechanism is different. Each application has its advantages and disadvantages. UV-LED has low energy consumption and high speed in curing. The disadvantage of UV-LED is that the opaque area can not be cured. Thermal curing has good applicability, but the curing speed is slow, the energy consumption is high, and the process is complex, because it is two-component.

 

 

 

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