Get yourself photo-initiated in the world of UV curing

Get yourself photo-initiated in the world of UV curing

Thursday, 14 May, 2020

100% solid UV-curable systems are increasingly common due to the advantages they provide:

  • Swiftness in obtaining the product.
  • Environmentally friendly as they do not contain solvents or generate gases.
  • High quality to products offering high resistance.
  • Avoidance of the need to use high temperatures when curing a surface.

This type of curing consists of photoinitiating the polymerisation of both the monomers and oligomers, generating the desired three-dimensional structure within a few seconds.

For this to take place, the photoinitiators must convert light energy into chemical energy via the generation of free radicals or cations. These reactive species interact with the monomers and oligomers to initiate the formation of polymers. Consequently, a resistant, insoluble coating is obtained from a soluble and liquid formulation in a matter of seconds or fractions of a second.

The choice of photoinitiator is crucial because it is the key component in this type of process. Indeed, it controls the degree of initiation of the reaction and the penetration of incident light. It is for this reason that Comindex recommends the following range of photoinitiators for you:

  • Doublecure 173. A highly reactive liquid photoinitiator, especially for clear coatings as it is non-yellowing. Its main applications are coatings for wood, metal and plastic and UV-cured adhesives.
  • Doublecure 184. This is the recommended photoinitiator when yellowing needs to be avoided over long periods of time, and it is also less sensitive to air than 173. Recommended applications are coatings for paper, flooring, wood, metal and plastic.
  • Doublecure 1819. This is the benchmark coating when a pigmented coating –especially white– is required. This is due to its high absorption that allows it to be activated when we have opaque or very thick layers. Its fields of application are translucent or pigmented coatings on wood, metal, plastic, paper and optical fibres and also in printing inks.

For further information about these products, please contact our technical advisory team.


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