Master Bond® UV15DC80 is a special dual cure epoxy based system which offers a primary cure utilizing UV light along with a secondary heat curing mechanism. This system addresses the problem of curing areas on parts that do not allow UV light curing because of “shadowing” issues. Most noteworthy is that the heat cure portion can be initiated at only 80 ºC rather than at the more common 125 ºC. Another very useful feature of a dual cure UV is that it allows for rapid fixturing and then enables the cure to be completed by adding heat. As alluded to above, a secondary cure at 80 ºC is not very common and highly desirable because of the sensitivity of many plastics to elevated temperatures. Also, the decrease of fixturing time to seconds is highly advantageous in a production environment, or when fixturing is a laborious and expensive proposition. One innovative use of a dual cure UV is to fixture two optically opaque substrates, such as metals, with the UV light exposure and then completing the cure with heat.
This moderate viscosity system features a cationic cure mechanism (for the UV portion) and has exceptionally low shrinkage upon curing. UV15DC80 is not oxygen inhibited and has outstanding chemical resistance to many acids, bases, fuels and solvents. It is a superb electrical insulator and bonds well to metals, glass, ceramics and most plastics. UV15DC80 has a service temperature range of -60 ºF to +350 ºF.
Straight UV curing can be accomplished for thicknesses of 0.010″ to 0.020″ in seconds using UV light at 365 nm with 20-40 milliwatts per cm² of energy. Faster cures can be achieved at higher energy outputs. Areas not cured because of shadowing can be cured at 80°C for 40-60 minutes. In addition, post curing at 125-150 ºC for 15-30 minutes can increase the Tg from 90 ºC achieved by straight UV curing to over 125 ºC. The 80 ºC secondary cure is truly a remarkable innovation. It has wide applicability in the optical, electronic and optoelectronic industries.
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