Paints and Coatings Auxiliaries for the coating of surfaces - Clariant

Enhancing antiblocking behaviour
The micronized waxes Ceridust 9615 A,
Ceridust 6721, Ceridust 9610 F and
Ceridust 9630 F have proved particularly
successful in producing an antiblocking
effect in solvent-containing
paints. Ceridust 9615 A exhibits the
smallest and Ceridust 9630 F the
greatest effect.
Ceridust 3920 F and TP Ceridust 3921 F
are primarily suitable for can and coil
coatings where low COF is required.
A special grade of PTFE will impart
superior slip and anti-blocking
properties.
Improving sandability
In lacquers based on polyurethane,
in acid-curing lacquers and furniture
lacquers based on nitrocellulose, the
addition of Licowax C micropowder
has proved successful in improving the
sandability of primers. So that the wax
can function optimally, it should first
be dispersed in a solvent suited to the
recipe with the help of a bead mill, for
example (see page 24).
Influencing the rheological properties
Licowax PED 521 and Licowax PED 522
have proved highly successful for
preventing sagging and running of
alkyd resin paints (page 25).
Preventing pigment settling
Even small quantities of Ceridust
9615 A – 0.5 % to 1.5 % relative to the
binder – delay the settlement of pigments
and fillers to form a hard sediment.
Sediments do form after some
time but are easily redispersed. An
even more effective way of preventing
settling is to use Licowax PE 520 as
a 10 % dispersion. Preparation of the
dispersion is described under
“Preparation of a wax dispersion”
on page 18.
In order to improve the settling behaviour
of pearl-gloss pigments,
Licowax 371 FP can be used and is
added as a 6 % dispersion to the paint
system. Preparation of this dispersion
is described on page 15 in section
“Licowax 371 FP”.
Making paints water-repellent
Ceridust 9615 A is suitable for making
protective wood finishes and protective
wood stains water-repellent. 2 %
to 6 % of the product incorporated
in the finished paint give the film good
water repellency at the initial drying
stage; in addition excellent film
smoothness is achieved (page 25).
Preventing metal markings
No metal markings of any kind may
occur when metal tools are used on
coated steel strip (coil-coated metal).
This is achieved by adding Ceridust
9610 F, Ceridust 9630 F, Ceridust
3920 F or TP Ceridust 3921 F.
These Ceridust grades have proved
successful with highly matt coil
coatings. Furthermore, the painted
surface should be as insensitive as
possible, so that in everyday domestic
use contact with metallic objects
does not leave any marks (table 1).
Superior surface slip
Ceridust 9325 F and TP Ceridust 9322 F
are modified PE wax/PTFE blends that
are primarily suitable for giving additional
surface slip. The very low mean
particle size diameter of only 6 µm
makes TP Ceridust 9322 F extremely
valuable for any thin film application.
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