COMPOUNDS | ELECTRICALLY CONDUCTIVE
Right: OCSiAl’s conductive additives promise to make the playground less or a hair-raising experience
surface resistivity of 109
-105
Ohm/sq while main-
taining colour and mechanical properties of the final product,” says a company spokesperson. Another recent application for graphene nanotubes is in polyethylene rotomolded products, such as containers for flammable liquids and powders, children’s slides, and oil separators where permanent and uniform anti-static or conductive properties are essential for safety reasons. The standard working dosage in such applications is typically around 0.5-1.0% of nanotube concentrate for achieving 106
-109 Ohm/sq surface resistivity.
OCSiAl says it is also in the development phase with a number of new product grades, including some suitable for engineering polymers, that can meet the requirements of injection moulded conductive parts typically needed by the large volume automotive and electronic industries. At NAUM’19 (the Nanoaug- mented Materials Industry Summit) in Kyoto, Japan, last November, the LehVoss Group presented results on improving the performance of PA6, PA12, PPS and TPU with graphene nanotube formula- tions that are now available on a commer-
Above: This electronic packaging tray in HIPS was developed by Portuguese company VFplas using Avanzare additives
cial scale. The company claims, for example, to be the first to offer an electrically conductive TPU for 3D printing that retains its flexibility and mechani- cal properties. Materials are available for both power bed fusion and FFF 3D print technologies. “If you think about applications, these are carriers, trays, housings, switchers, containers and medical equipment,” says Marco Burth, LehVoss Group Product Development Manager.
Right:
Checking an electrically conductive Luvocom PEEK compound produced by LehVoss
Nano masterbatches Nanotechnology company Avanzare Innovacion Tecnologica, which is based at Navarrete in Spain, says it is paving the way in developing nano-additive masterbatches that enable high electrical and thermal conductivity in thermo- plastic components. It offers a complete series of colourless permanent antistatic additives and masterbatches suitable for applications such as packaging, electronics, technical flooring, and ATEX parts.
42 COMPOUNDING WORLD | February 2020
The company cites its Avandiss-232 masterbatch for HIPS and PS as an example. It is said to be suitable for production of non-black electronic components or packaging materials with a range of electrical resistivity from 109
-106 -101 Ohm/sq.
Another example is its range of electrically conductive (10-1
Ohm/sq) EVA thermoplastics
that also provide thermal management. These solu- tions are based on “graphene related” materials, which are processed by Avanzare into master- batches. The company also produces heatable compounds that can be employed for flooring using low voltage current. “The use of this low voltage and the very low electrical resistance of the developed plastic allows the generation of heat and the transfer of this to the tile and therefore generate a radiant floor of low consumption,” says Javier Perez, CCO at Avanzare. Heat dissipation from a hot element has also been demonstrated. Another supplier with long experience in nano additives is Nanocyl. It says that over the past five years, electrically conductive compounds contain- ing its Plasticyl NC7000 multiwall carbon nanotube (MWCNT) masterbatch “have become the market technical benchmark in various industry segments.” It says market share of the materials have signifi- cantly increased in automotive (fuel systems and exteriors), electronic packaging (HDD trays) and industrial applications. “More recently, the demand for electrically conductive solutions has surged in new market environments,” says Michaël Claes, Chief Technology Officer at Nanocyl in Sambreville, Belgium. “Most notable ones are harsh environment dedicated products (ATEX regulation), specialty cables and additive manufacturing.”
He also points to devel- opments in the area of
www.compoundingworld.com
IMAGE: LEHVOSS
IMAGE: OCSIAL
IMAGE: AVANZARE INNOVACION TECNOLOGICA
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