With the new ‘Black&Light’ adhesives, Panacol has developed a new deep curing black adhesive technology. The new black adhesive, unlike its conventional predecessors, allows for a complete cure without the need of a secondary thermal process.
Conventional black UV adhesives have a disadvantage – the black colour absorbs a high proportion of the UV intensity, which means that the energy needed to fully polymerise an adhesive can only penetrate a few micrometres. This results in surface ‘skin’ formation on black adhesives, but the material is not completely cured. They must then be cured in a secondary thermal curing process at temperatures above 100°C.
Panacol–Elosol GmbH's new ‘Black&Light’ technology enables the complete curing of black epoxy adhesives with LED UV energy. Panacol's Vitralit® product range can be cured in thicker layers, without resorting to secondary curing mechanisms. The adhesives are suitable for encapsulation, glob top or edge bonding in electronics manufacturing, as well as for optical adhesive systems where high OD (optical density) values are required. The product is suitable for optoelectronic applications to help minimise reflections and enhance sensor transmission values.
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 polymerisation is complete, the structure of the adhesive technology prohibits light transmission, resulting in a fully cured adhesive system that remains irreversibly black.
The ‘Black&Light’ epoxy adhesives can be stored and shipped at room temperature or under normal refrigeration. Also, the adhesive is compatible with many Vitralit® epoxy adhesives from Panacol. Custom adhesive solutions can be created to accommodate unique requirements – for the amount of light blocking or the depth of cure. Additionally, the adhesive systems can be adapted to specifications of various application.
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