Radiation rapid curing

For the radiation rapid cure experiments, appropriate resin mixtures containing oligomers, monomers, flow additives and sensitisers (UV) were applied to the substrate as a thin coating, the material placed on a conveyor belt and then exposed to the UV and EB sources. The time taken to observe cure for each of the samples was then measured on a relative basis. The UV system used was a Primarc Minicure unit with lamps of 200W per inch. Two EB facilities were utilised namely a 500KeV Nissin machine and a 175KeV ESI unit. 

As a preparative technique, the present radiation grafting process is useful for polypropylene and cellulose, however with leather care is needed, since the solvents tend to dry out this trunk polymer and embrittle it with time. Thus for many leather treatments, the radiation rapid cure processes mentioned at the end of this paper are to be preferred. 

Comparison of Grafting with Radiation Rapid Cure Processing for Upgrading Materials... 

The effect of sensitiser structure on UV grafting of monomers to polypropylene and cellulose is examined. The use of the radiation grafting technique is compared with radiation rapid cure polymerisation as processes of use in the field of renewable resources. 

Cationic cured epoxies may also be crosslinked by electron beam radiation. A major application for this technology is the repair of composite aerospace structures. Direct benefits of EB processing include rapid cure, allowing completion of a permanent repair in the same or less time than a traditionally temporary repair, and ease of material handling. Other... 

UV-radiation is used to achieve rapid curing and to avoid set-off effects in offset printing. The binders in UV-inks are highly reactive acrylate monomers and oligomers to which photoinitiators are added. These initiators start the cross-linking reaction in response to UV-radiation. Photoinitiators are low... 

There are some donor compounds which, while not completely preventing the dark reaction, will inhibit it and, at the same time, not interfere with the curing reaction. Cyclic amides (30), nitriles ( ), substituted ureas ( ) and sulfoxides (33) have been shown to promote storage stability of photosensitized epoxides without preventing rapid cure when exposed to ultraviolet radiation. 

---