A new type of substrate wetting additive for low-VOC water-based adhesive products

In order to obtain a strong bond, the substrate must be completely moisturized. Effective wetting additives reduce the surface pressure of the adhesive and allow the substrate to be completely covered. Effective wetting additives are particularly important for low surface energy, which can hinder substrate coverage. In addition, if the substrate is contaminated, low-energy contaminants also reject the adhesive, resulting in surface defects and weak bonding. If effective wetting additives are present, the adhesive can moisturize any contaminants and
or low-energy substrates, resulting in strong, unbulable bonding.
TroyCorp.
company's multi-
TroysolTMLAC
products provide excellent wetting for low-energy and contaminated surfaces
,
for strong bonding. However, due to government regulations and consumer demand for green products that meet environmental requirements,
Troy
has introduced
TroysolZLAC
to meet this requirement.
ZLAC
, which contains no harmful air pollutants (
HAPs
), alkyl phenol hydroxyethyl esters (
APE
), is a zero-
VOC
version of a traditional
LAC
product. It has the same excellent
wetting performance as traditional
LAC products, and can also be prepared with low-
VOC
water-based adhesive products.
ZLAC
is a versatile, silicone-free wetting additive that improves wetting properties, system fluidity, leveling, adhesion, gloss and color uniformity of water-based coatings, polymers, inks and adhesives.
reduces surface
high surface pressure makes water naturally unable to wet most substrates well.
first of all,
Troysol ZLAC
the ability to reduce surface stress, which is necessary to completely wet low-energy substrates. Figure
1 shows
how
ZLAC
reduces the surface pressure of water when its usage is as low as
0.1%
. Table
1
the surface stress values of the typical solvents used in the adhesive formulation. Traditional adhesive processes are solvents based on low surface stress. Instead, hydro-adhesives require the use of wetting additives to reduce surface stress. The use of wetting additives enhances the coverage of substrates with low surface energy (table
2
).
liquid adhesive with high surface stress wets poorly on low-energy substrates, resulting in shrinkage and
/
or severe wrinkles. However,
ZLAC
effectively reduces the surface pressure of water to
25dynes/cm
, allowing water-based adhesives to be coated on low-energy substrates. Figure
2
a wetting test on a silicone film. Formulas containing
ZLAC
can be completely covered, while another formulation containing hydroxyacetylene glycol
-
, a commonly used wetting additive, exhibits severe wrinkles when used at the same concentration.
peeling strength test
peeling strength test is used to determine the bonding strength between the two materials. To evaluate the bonding strength given by the wetting properties of
TroysolZLAC
and
LAC
, peeling strength tests were conducted using three typical
PSA
formulations (see column chart).
steps are used to assess the peeling strength (by
). PSTC 101
Test Method
D

180o
Peel test
)
:

coating the adhesive on an untreated
PET
)
substrate;


24h
, the substrate of the coated adhesive is placed on a stainless steel plate, and

tests the peeling strength using
ChemInstruments
's
TT-1000
pull tester.
can be used to
The
Troysol ZLAC
and
LAC
in A and B. The use of
ZLAC
alone in formulas
A
,
B
and
C
was also evaluated for "very low usage (
0.05%-0.2%
) (adhesive quality based on the quality of the total formulation)" to determine the minimum amount of maximum peeling strength.
results and conclusions
test data show that the
PSAs
's peeling strength has been increased by
ZLAC
's wetting of the substrate
, and the
results are the same as the best performance provided by traditional
LAC
products (Figures
3
and
4
). Both additives enhance the wetting of the substrate and increase the peeling strength, thus giving greater bonding strength and a better complete paint film. In addition, when usage is as low as
0.05%-0.1%
, the
ZLAC
significantly increases the bonding strength of formulas
A
,
B
and
C
(Figure
5
).
will be low
VoC
's
Troysol ZLAC
wetting additive is used in the
PSAs
and when the
PSAs
is applied to a low-energy substrate, it shows that it has the same excellent substrate wetting effect as the
Troysol LAC
.
ZLAC
is a more environmentally friendly, environmentally friendly substrate wetting agent in adhesives and closures. It helps formulating designers get the best