COMPOUNDS | ELECTRICALLY CONDUCTIVE
cion Tecnologica. The Spanish company says the compounds contain a variety of functional addi- tives enhanced by graphene and other nano -additives and offer electrical conductivity in the range of 1S/m. They also absorb electromagnetic waves in a frequency range from 100Hz to 8GHz. Belgium-based Nanocyl, which has been making multi-wall carbon nanotubes (MWCNTs) for around 20 years, claims its NC7000 is the market benchmark in the ESD plastics industry. It proposes a wide range of dispersions in various media, among them the Plasticyl range of polymer-based products, including masterbatches.
Focusing on 3Dprint The company has recently been placing consider- able emphasis on the development of materials based on various polymers for 3D printing filament extrusion. It now has several dedicated Plasticyl products that are adapted to the processing specifications of FFF technology. Electrical resistiv- ity can be adjusted in the range of 10 to around 109
ohm.cm. Alicia Rul, Technical Sales Manager Americas at the company, cites upgraded Plasticyl ABS com- pounds as an illustration of current developments. “Performances are better than the injection moulding ‘standard’ grade,” she says. “Electrical conductivity and mechanical performance of printed parts by fused deposition moulding are better than the parts done via injection moulding.” Results are shown in Figure 4. Netherlands-based CarbonX says it has new
data showing that its product, also called CarbonX, could provide performance-enhanced plastics with the recyclability that manufacturers need to implement real circularity and comply with upcom- ing EU regulations. CarbonX is composed of nano-sized carbon filaments that are chemically connected to form a three-dimensional micron-sized network. The company describes the the additive as the “missing link between the performance of a nano-structure and the processability of a micron-sized material.” The company says the novel CarbonX structure
Figure 4: Electrical conductivity, elongation at break and modulus of Plasticyl NC7000 dispersion in ABS fused deposition moulding compound versus injection moulded ABS at addition levels of 2, 3 and 4 wt%. Source, Nanocyl
54 COMPOUNDING WORLD | February 2022
makes it possible to combine properties in plastics compounds in new ways that could provide “the key to unlocking new design possibilities that can deliver both high performance and greater sustainability.” While pressure to mandate compulsory use of post-consumer recycled plastics in new products is strongest in the packaging sector, CarbonX says the focus of future legislation “will inevitably be extended to all plastic applications.” The CarbonX additive was recently tested to determine how well compounds containing it could retain initial properties after being recycled. A PP compound containing 45% CarbonX was re-processed 10 times to simulate the recycling process and its properties measured after each cycle. “High loading was used to test the limits of CarbonX because high loading increases shear during processing and makes it tougher to keep properties intact,” says Daniela Sordi, CTO at CarbonX.
It was found that volume resistivity was largely
preserved in the compound. The stability of the E-modulus and yield stress indicate that strength
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