The curing system of UV adhesive can generally be divided into three categories: free radical polymerization acrylic resin system, multiple curing system, and epoxy resin system.

1. Acrylic resin system UV adhesive

The lifespan of free radical acrylic resin is very short, only about tens of ns (10 to the negative 9th power second). That is to say, the UV cured resin of the acrylic acid system will undergo free radical polymerization when exposed to UV light. If the irradiation is stopped, the free radicals will immediately disappear and no further chemical reactions can occur.

2. UV adhesive with multiple curing systems

Part of the UV cured epoxy resin belongs to a multi curing system, which can cause cationic chemical reactions to stop when illuminated alone, or can cause cationic chemical reactions to stop when heated. This system can stop active polymerization of ions triggered by UV irradiation or heating, either after irradiation or after heating. The curing characteristic is that when exposed to UV light, rapid curing occurs and polymerization reactions occur, while when not exposed to UV light, natural slow curing occurs and polymerization reactions occur.

3. UV adhesive for epoxy resin system

UV curing epoxy resin requires exposure to UV light to trigger chemical reactions and produce cations. These ions will continue to stop active polymerization after stopping irradiation with UV light, which can enhance the various properties of the resin. Without exposure to UV light, there will be no chemical reaction. Cations will not stop active polymerization.