Photoinitiators for UV curing. Cured in the blink of an eye

Photoinitiators for UV curing. Cured in the blink of an eye

Monday, 15 October, 2018

The photoinitiator market has suffered serious difficulties in recent times: the Blue Sky initiative of the Chinese government causing the closure of important plants, REACH / CLP legislation in Europe, etc. Let’s introduce you to our photoinitiators.

Curing by UV radiation basically consists of photoinitiating the polymerisation of multifunctional monomers and polymers, which are transformed into a three-dimensional structure within a matter of seconds.

Photoinitiators convert light energy into chemical energy, forming free radicals or cations. These reactive species interact with monomers and oligomers to initiate the formation of polymers. In this way, they transform a liquid, soluble formulation into an insoluble, resistant coating in a matter of seconds (or fractions of a second).

The photoinitiator plays a key role, firstly by controlling the degree of initiation of the reaction, as well as the penetration of the incident light and, consequently, the curing depth.

Comindex distributes two groups of photoinitiators from Double Bond Chemical:

Photoinitiators for free radical UV curing, which undergo a unimolecular dissociation in radicals from the excited state (Type I photoinitiators).

DOUBLECURE 173. A highly reactive photoinitiator for transparent coatings, non-yellowing. It is usually combined with DOUBLECURE 184 in multiple applications: varnishes, wood primers and lacquers; paints for plastics, metal and leather; coatings for vacuum metallizing (basecoat and topcoat); peelable films and coatings for construction materials; anti-stain varnish and primer for carbon fibre; etc.
DOUBLECURE 184. Recommended when anti-yellowing properties are crucial. In addition to the aforementioned applications, used alone or combined with DOUBLECURE 173, it is also used for UV curable adhesives, screen printing and offset inks.
DOUBLECURE 1819. For pigmented systems, especially white; for transparent systems for exterior use combined with UV stabilisers. Recommended for coatings on wood, metal and plastics, overprint varnishes, offset inks, screen printing and 3D printing.

Photoinitiators for cationic UV curing, which initiate the polymerisation reaction via an ionic mechanism, generally cationic, and which has the advantage of not being inhibited by atmospheric oxygen. It is primarily used for epoxy ring opening.

DOUBLECURE 1176 y DOUBLECURE 1190. Cationic photoinitiators used to induce the polymerisation of epoxides and other cationically-polymerisable materials. Ideal for fine and transparent coatings on metal, plastic, paper and glass substrates.

Double Bond Chemical (DBC) develops and produces specialities for the formulation of ultraviolet curable coatings. With its headquarters in Taipei, Taiwan, DBC supplies its products worldwide and utilises a wide range of techniques in the design and manufacture of its products to achieve an excellent standard of quality.

For further information about these products, please contact our Technical Sales Advisers.
URL: www.dbc.com.tw

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