material used at UV Cure-able ink

1. Ir. Sugeng Endarsiwi, ST, MBA
= = = = = = = = = = = = = = = = = =
MATERIAL USED
IN RADIATION
CURABLE
PRINTING INK
Polymer base ink – UV Cured
Ink – Ultraviolet Lamp
Technology

2. The following
sections are
included:
ACRYLATE OLIGOMERS
Epoxy Acrylates
Urethane Acrylates
Polyester Acrylates
AMINE MODIFIED POLYESTERS AND
SYNERGISTS
PHOTOINITIATORS FOR FREE RADICAL
SYSTEMS
TYPICAL FORMULATION
CATIONIC SYSTEMS
REFERENCES
INTRODUCTION
UV CURING
ACRYLATES — TYPES
AND
CHARACTERISTICS
Linear Monoacrylate
Monomers
Cyclic
Monofunctional
Monomers
Aromatic
Monofunctional
Monomers
Difunctional Acrylate
Monomers
Trifunctional
Acrylate Monomers
Tetra and Higher
Functional
Monomers

3. • INTRODUCTION
• UV curing inks are specially formulated inks
that remain liquid until they are cured with
exposure to intense ultra-violet light. The UV
light cross-links the ink components into a
tough polymer. This reaction is very fast—
almost instant. They contain no solvents, and
don’t rely on absorption into substrates for
drying.
• By far, the biggest advantage to UV curing
ink is lack of solvent fumes (also known as
volatile organic compounds, or VOC’s for
short). In addition to smelling bad, VOC’s are a
health risk to our employees and a contributor
to air pollution
They work in different wavelengths (see picture) than the standard UV lamps and the inks are curing only in the spectral UV-A area (close to visible light).

4. • In recent years it has become necessary to double check what
exactly is meant when somebody talks about UV-Offset.
Nowadays it is not merely UV-Offset printing. There are many
more terms and new technologies swirling around, which all
have the same idea: Curing UV inks at a lower energy input.
• We can find H-UV from Komori, while Manroland is marketing
LEC-UV. KBA calls it HR-UV and to Heidelberg, it is LE-UV.
Additionally UV inks can be cured with even less energy input by
using LED-UV, with Ryobi being a pioneer in this technology.
• Regardless of curing method, whether it be UV, low-energy
UV or LED-UV, each of these technologies require their own inks
that react to the very specific UV-range in order to cure.
• UV curing is a low-temperature, high-speed, solvent-less
photochemical process that uses high-intensity electronic
ultraviolet (UV) light to change inks, coatings, adhesives or other
photo-reactive substances through polymerization into an
instantly fixed-in-place solid. “Drying,” by contrast, solidifies
chemistry through evaporation or by absorption. Ideally, with UV
curing, the cured substances become securely adhered to the
substrate onto which they were applied, with adequate depth of
cure without being tacky, sticky or flakey.
• Types of UV curing include spot curing, flood curing, hand-
held curing and conveyor curing. UV curing systems use a variety
of lamps as the UV light sources: mercury-based arc lamps which
generate broad spectrum UV light; and light emitting diodes
(LEDs) that emit only UVA energy. While UVC LEDs are an option,
the power output and efficiency is much lower.

5. • Monomers: A monomer is the basic
building block of UV curable ink. It directly
affects the viscosity, softness/hardness,
flexibility and elongation characteristics of
the ink.
• TMPTA is trimethylolpropanetriacrylate,
is a trifunctional monomer used in
manufacture of plastic,adhesive, acrylic
glue, anaerobic sealant, Ink is useful in the
low volatility and fast cure response. It has
the property of resistance against weather,
chemical, water and abrasion.
• TPGDA, Tripropylene Glycol Diacrylate, is
a high boiling monomer with low vapor
pressure which is used in free radical
polymerization.
•
• Characteristic: Low viscosity,Low
volatility, High active, Good flexibility

6. Oligomers:
Oligomers are reactive resins used to improve adhesion to a wide range of substrates

7. • Polyester-amines.
• are polymers comprised of repeating
units linked by ester bonds (polyesters)
that also bear amine functionalities,
typically in the form of an amine group
located in the polymer backbone.
• amine, any member of a family of
nitrogen-containing organic
compounds that is derived, either in
principle or in practice, from ammonia
(NH3).
• Amine synergists are widely used in
UV curable acrylate-based coating
formulations. They are often used
together with Norrish Type II
photoinitiators such as benzophenone.
• The tertiary amine function provides
an active hydrogen donor sight for the
excited triplet state of the
photoinitiator

9. REFERENCES
1. https://www.stafix.eu/blog/different-uv-curing-methods-in-offset-printing/
2. https://www.prismtechgraphics.com/blog/benefits-of-uv-curing-inks-in-screen-and-digital-printing/
3. https://baldwintech.com/what-is-led-curing

10. Sugeng Endarsiwi
• 20 years experience at Printing Ink Manufacturer (DIC Indonesia,
Printcolor Indonesia, Edson Vietnam)
• Indonesia : 2000 – 2003 (1st period)
• Vietnam : 2004 – 2016
• Malaysia : 2016 – 2021
• Indonesia : 2021 – NOW (2nd Period)
Recognized:
The Indonesia Engineer Institution / PII, 2022 (as Professional Engineer)
Chartered Management Association, CMA Hong Kong SAR, 2022 (Business &
Management)
:: Ir. Sugeng Endarsiwi, ST, MBA :: email address: endarsiwi.sugeng@gmail.com :: Linked in :
https://www.linkedin.com/in/sugeng-endarsiwi-mba/ ::