7/31/2019 Basics of UV Curable Coatings - SelChem

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By

SelChem India

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Increasing Energy

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Increasing Energy

Wavelength

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Energy derived from Radiation = Radiant Energy

Radiant Energy can be used for various applications :

e.g. Cathode Ray tubes used in televisions, or Microwavesused for cooking, X-Rays used for diagnostic applications etc.

Similarly, radiant energy from forced air convection ovens orInfra Red sources or Ultravoilet lamps are used as sources ofenergy for various industrial applications.

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Transfer of Radiant Energy can be understood bytwo different perspectives :

1. Wave phenomena.

2. Sub-atomic particle movement.

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The key characteristics of all waves are :

1. Wavelength

2. Frequency

3. Intensity Avg. amount of energy transferred bya wave per unit time and per unit area.

For curing of UV coatings, inks & adhesives, UVlight having wavelength between 180nm to400nm is usually used.

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Radiant energy from the Electro Magneticspectrum can also be characterised as particulatebundles of energy called as Photons.

Photons from UV light react with photo-initiatorsin UV coatings/inks/adhesives to initiate thecuring process.

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UV coatings are designed to match spectral output of the lamp usedfor curing the coating/ink/adhesive.

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UV LED is a new source of UV light with many advantages. However,there are some limitations with UV LED which have to be overcome.

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Reduced floor space UV curing equipment is more compactthan conventional curing equipment.

Suitable for heat sensitive substrates like plastics, wood,paper etc.

Reduced in-process inventory single step in-line process.

No intermediate steps or ageing/maturation of coatings. Lower insurance & reduced handling hazards can be offered

as solvent-less coatings complying with VOC & HAPregulations.

Reduced costs Substantial energy savings can be achieved

by switching from thermal cured to UV cured coatingsystems.

Proven Technology in commercial use since 1960s.

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Typical UV Coatings consist of :

1. Mixture of reactive Oligomers

2. One or more reactive Monomers

3. UV Light absorbing components (Photo-initiators)

4. Additives

5. Pigments

The chemistry used is usually acrylate or uerthane-acrylate.

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1. Coating of wood2. Coating of plastics

3. CD/DVD coatings & adhesives

4. Coating of Electronic PCBs

5. Coating of 3-D substrates

6. Adhesives for lamination or assembly

7. Release coatings

8. Metal decoration inks

9. Coating of optical fibres

10.Printing & packaging (inks, overprint varnish)

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Thank You !