ENSACO® Conductive Carbon Black for polymer ... - Timcal Graphite

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The selection of a
conductive carbon black
NENSACO ® Conductive Carbon Blacks find
their applications in an unlimited number of
plastics. The combination of the polymer type
and grade and the carbon black grade are determining
the overall electrical and mechanical
performance.
NThe main parameter influencing the final
conductivity of a finished part in a given polymer
is the type and level of carbon black used.
NThe higher the structure of the carbon black,
the lower the level of carbon black needed to
achieve the required conductivity. Nevertheless,
in a minor way, other parameters like the additives
in presence, the compounding or processing
conditions may also influence the final conductivity
of parts.
NLow surface area conductive carbon blacks
show a particular advantage on dispersion and
processing.
NPercolation curves – correlating the volume
resistivity and the carbon black percentage – are
a useful comparative tool to predict the conductivity
in place and to select the more appropriate
system. These curves are valid for a given formulation
and sample preparation technique.
NThe selection of the conductive carbon black
will also influence:
the compounding behaviour
(dispersibility, resistance to shear, mixing cycle,
melt flow index, extrusion throughput);
the surface appearance of the finished
material (number of surface defects);
the mechanical properties
(polymer property retention, reinforcement);
the overall price – performance ratio.
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Typical applications for ENSACO ® Conductive Carbon Black
Electrically
conductive plastics
The preparation of a
conductive compound
NSuitable mixing equipments for the preparation
of black conductive compounds include
internal mixers, twin screw extruders, single
screw kneader machines and LCM. The feeding
of low bulk density, soft flake-type carbon
blacks into extruders requires the use of twin
screw feeders and separate introduction on an
already molten polymer (split feeding technology).
Some typical final plastics
applications:
handling of electronic components:
carrier boxes, carrier trays, carrier tapes, etc.;
films: antistatic and conductive films,
packaging films, garbage bags, etc.;
automotive industry: fuel injection systems,
anticorrosion systems, fuel tank inlet,
electrostatically paintable parts, etc.;
transport: mobile phone parts, wheels,
containers, bins, pallets, etc.;
computer: antistatic articles for computer
& accessories, CD player, etc.;
health: medical applications,
cleanroom equipments, articles for
antistatic workplaces, etc.;
antistatic flooring;
heating element;
sensors;
PTC switches;
UV protection and pigmentation.
In the following pages there are some of the
results of experimental work carried out on
ENSACO ® Conductive Carbon Blacks in different
polymer compounds.
The data shown here are given as orientation
and are valid for the particular formulations
and sample preparation technique
mentioned. Results in other polymers, full
studies and publications are available upon
request.