Slip & Mobility
Slip properties (sometimes called lubricity) represents the ability of two
surfaces to glide over each other without causing any mechanical damage. Good slip
properties require that the slip additive concentrate to the surface during and
immediately after application and curing.
Generally speaking, the harder the wax, the better the slip properties. This
is explained by the fact that wax crystals in the solid state are the main factor
responsible for the characteristic of slip. While softer waxes tend to be more easily
liquefied, and as a consequence, exhibit a lower proportion of solid crystals, the
harder waxes resist liquefying and have a relatively higher proportion of crystals
in the solid state to impart slip.
Thanks to this property, wax is widely used in
Inks, OPV's & Primers, Paper, Film, &
Foil, and Metal coatings application.
Slip resistance is the ability to manipulate the surface energy by increasing the
coefficient of friction of a cured coating. This can be realized by addition
of wax surface modifiers.
In particular, polypropylene wax emulsions control slip without adversely affecting
scratch and mar resistance. Furthermore, polypropylene waxes also have good migration
performance which results in an increased wax density on the coating surface.
When formulating with polypropylene wax emulsions, it is crucial to adapt the particle
size of the emulsion to the coating layer, in order to maximize the wax effects
on the coating surface.
Wax emulsions are used for their slip resistance property in