ADDITIVES | ELECTRICALLY CONDUCTIVE
For high conductivity and EMI shielding applica-
tions, Cabot offers its Athlos Carbon Nanostruc- tures (CNS) in the form of both dry pellets and as Cabelec conductive concentrates. “CNS are highly conductive nanomaterials with electrical percola- tion thresholds between 0.25% and 0.5% by weight,” says Strässler. “The materials are 97% carbon, pure, highly branched and crosslinked, enabling high electrical conductivity, good processibility and excellent EMI shielding in plastic components.” The CNS particles are manufactured using a
Figure 1: A comparison of compound moisture absorption (CMA) performance of different Cabot conductive additives in an HDPE compound at equal resistivity (1E+03
ohm.cm) Source: Cabot Corporation
roll-to-roll chemical vapour deposition process, which results in a greater carbon content than conventional carbon nanotubes (CNTs). In addition, the morphology of CNS flakes means they are more easily dispersed than conventional CNTs. As a result, CNS materials are said to percolate at lower loadings than conventional CNTs (Figure 2). These lower loadings minimise any negative impact on the final part’s mechanical properties and increase formulation flexibility, according to Cabot. The Cabelec CNS concentrates contain pre- dispersed and exfoliated carbon nanostructures. “Each of the new CNS concentrates uses a different polymer carrier system to maximise compatibility in the customer’s plastic component while achieving their conductivity, design, and mechanical require- ments at a reduced usage level,” adds Strässler.
Figure 2: Comparison of surface resistivity against additive loading for a PC compound containing a high structure carbon black, multi-wall carbon nanotube (MWCNT), and Cabot’s Athlos carbon nanostructure (CNS) additive Source: Cabot Corporation
Expanding capacity Carbon black manufacturer Orion Engineered Carbons is currently building a facility at LaPorte in Texas to produce conductive carbon additives using an acetylene-based process. The US plant,
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