1.
The Selection of
Stabiliser
substances that are used to prevent a chemical
process of pre polymerization
By: Ir. Sugeng
Endarsiwi

2.
UV protective additives fall into
two categories:
– Absorbers
– Stabilizers.
UV absorbers dissipate the energy
in a less damaging form,
while UV stabilizers act as
scavengers, reducing the reactivity
of any free radicals formed within
the coating.

3.
Stabilizer (UV) in-can stabilizer. It retains viscosity and acts as
rheology modifier. It has no effect on reactivity
is a polymerisation inhibitor in acrylic acid ester. It is a stabilizer for
radically curable inks (UV/EB).
The product has good solubility in acrylates and methacrylates, and it
maintains reactivity and viscosity. Compared to hydroquinone (HQ)
and the hydroquinone mono methylether (HQME) GENORAD* 16 has
low or no effect on the reactivity of the system.
It can be used in offset inks, letterpress inks, screen inks, flexo inks,
inkjet and wood applications

4.
UV absorber is an ultraviolet light absorber (Uva) additive.
UV stabilizer range contains two types of light stabilizers: Ultraviolet Light
Absorbers (UVA) and Hindered-Amine Light Stabilizers (HALS), used
individually or as blends.
UVA filter harmful UV light and help prevent color change and delamination of
coatings, adhesives and sealants.
HALS trap free radicals once they are formed and are effective in retaining
surface properties such as gloss and prevent cracking and chalking of paints.
The combination of these two families is highly synergistic.
UV Absorbers soak up detrimental UV rays from sunlight, converting them into
heat, which is then dissipated through the surface of the coating

5.
The baseline formulations containing no stabilizers
or UV absorbers underwent the greatest
alterations during the exposure period. These
included increased yellowness and color changes
as well as gloss reduction and the development of
defects such as whitening, blistering, cracking
and flaking on all tested panels.

6.
No Stabilizer, ink
will tent to gelled
Expired faster
Will not running
longer at press