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 !
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