Black Epoxy Adhesives Cured with LED UV Energy
Panacol has developed a new adhesive technology with the new "Black & Light" adhesives: deep curing black epoxies.
Black epoxy adhesives from Panacol's Vitralit® product line can now be cured with UV light sources in thicker layers without the use of secondary curing mechanisms.
Traditional black UV adhesives have a significant disadvantage: the black color absorbs a large proportion of the UV intensity, which means that the energy required to fully polymerize an adhesive can only penetrate a few micrometers.
This results in the formation of surface "skin" on black adhesives, but not a complete cure. They must then be cured in a secondary thermal curing process at temperatures above 100°C.
Panacol's new "Black&Light" technology cures black epoxy adhesives completely with LED UV energy. Cure depths can vary from a few hundred micrometers to several millimeters.
The adhesives are appropriate for encapsulation, glob top, or edge bonding in electronics manufacturing, as well as optical adhesive systems requiring high OD values (optical density). They can be used in optoelectronic applications to reduce reflections and improve sensor transmission values.
A typical manufacturing process using “Black & Light” technology can be as follows: The black adhesive is dispensed and cured with the appropriate wavelength and intensity. During the curing process, the “Black & Light” technology within the adhesive enables the UV rays to penetrate and complete a full cure.
Once the adhesive polymerization is complete, the structure of the “Black&Light” technology prohibits light transmission, resulting in a fully cured adhesive system that remains irreversibly black.
The “Black&Light” technology is compatible with many Vitralit® epoxy adhesives from Panacol. Custom adhesive solutions can be created to accommodate unique requirements for amount of light blocking and depth of cure.
The “Black & Light” adhesive systems can be very specifically adapted to specifications of the respective application. Another major advantage of the “Black&Light” adhesives is storage.
Many single-component, black epoxies require deep frozen transportation and storage. The “Black&Light” epoxy adhesives can be stored and shipped at room temperature or under normal refrigeration.
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