1d-RT 1d-ET
Tg = - 10°C
8
Block Rating
4
6
2
0
A
B
and surfactant and their effects on block performance.
Lastly, surfactant-polymer compatibility also depends on
polymer composition. The interplays of all the above-mentioned factors will lead to specific surface properties
and morphological features. The block results thus reflect
the balanced result of surface and bulk contributions.
Surfactant Type
Figure 5 displays the block results of the acrylic latexes stabilized with two different anionic surfactants.
At the same polymer Tg and surfactant level, surfactant
B provided improved antiblocking property and the
differentiation is especially apparent for the hot block
resistance. Figure 5 demonstrates the impact of chemical
composition of surfactants since the polymer bulk properties are similar (same Tg). The difference in block resistance emphasizes the influence of film surface properties. It has been shown that interfacial surface tension
and surfactant-polymer compatibility dictates surfactant
distribution in the latex films. 27-29 The results in Figure
5 suggest that surfactants A and B likely have different
migration profiles and/or orientation on the interface,
producing different film surface characteristics.
CONCLUSIONS
The influences of some polymer design parameters
on block resistance are examined. This article reveals
that many factors can influence the block resistance
of low-VOC acrylic paints. Since block resistance is a
function of surface profile and bulk material properties,
surfactant structure and concentration are important
considerations in latex synthesis. Other latex design parameters such as increased Tg and gel content also have
positive effects on block performance of acrylic polymers. The results presented in this article demonstrate
that good block performance can be achieved with homogeneous acrylic latexes when the above parameters
are optimized.
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