COMPOUNDS | ELECTRICALLY CONDUCTIVE
Right: Eurotec’s Tecolen CP20 BK EC 0C
conductive PP is formulated for production of ESD transport crates
attenuation in the most frequently used frequen- cies for e-mobility. The clear performance and cost benefits greatly aids die cast metal replacement in electronics housing, whilst the older generation of EMI shielding compounds were more of an obstacle to this switch. Our compounding flexibility allows us to develop customised grades with additional properties such as flame retardan- cy, thermal conductivity, and mechanical proper- ties.”
Sensing opportunity Another company keen to capitalise on the EV boom is Polyplastics, which last year launched a new grade of its Duranex polybutylene terephtha- late (PBT) for millimetre wave radar sensor applica- tions, where it is said to offer the opportunity to reduce assembly work and cut cost. Today’s Advanced Driver Assistance Systems
Below:
Automotive safety systems such as millimetre wave radar sensors require polymers with optimised electromag- netic properties
(ADAS) use millimetre wave radar sensors to determine the distance, speed, and angle of objects such as approaching cars by sending and receiving radio waves. Polyplastics says that a range of electromagnetic wave absorbing materi- als have previously been partially incorporated on the PBT radomes through which the electromag- netic waves are transmitted. However, it says Duranex PBT 201EB has the same PBT resin base and bonds well in two-shot moulding capabilities. Sensor housing components require specific
attributes, including good mechanical stiffness, creep and fatigue resistance and dimensional stability alongside EMI/RF shielding properties. Turkish compounder Eurotec says it provides materials especially formulated for sensor compo- nents, such as its Tecomid NB30 GR20 BK EF (an electrically conductive black grade of PA6 rein-
forced with 20% glass fibres), that provide these properties. During transportation
of electronic equipment, dissipation of accumulated
electrostatic charges is critical to avoid catastrophic damage. Eurotec’s
Tecolen CP20 BK EC 0C (a black conduc- tive PP copolymer compound) has the
required characteristics for use in ESD crates. Meanwhile, Tecomid HT NT40 KC60 BK056 HS 0A (a 60% glass fibre/carbon fibre reinforced conduc- tive black PPA) provides the high mechanical strength and rigidity required for use in functional parts for critical applications. For industrial static management applications such as conveyor parts, flame retardancy is also frequently considered a critical requirement. The company says its Tecolen CP30 BK EU71 (a flame retardant and electrically conductive black PP copolymer compound) offers UL94 V-1 flame retardancy and volume resistivity of less than 103 Adeka’s AS-307 permanent antistatic agent
Ω.
provides immediate and long-term performance in polyolefin films while maintaining transparency. With a surface resistivity of 106 Ω/sq, it can provide levels of antistatic performance ranging from anti-dust to ESD and is available in pellet-form, making it easy-to-handle. It can also be used with various colour pigments, such as the pinks and blues used to identify electrostatic packaging films. “ESD can potentially damage finished products
by rendering the circuits useless,” says Adeka Technical Director Marie-Raphaël Morvillier. “That is why ESD packaging and films have become so valuable in today’s world, being designed to help prevent build-up of electrostatic charge both on the inside as well as on the outside. Different types of ESD films and trays can now be found on the market based on their working principle - antistatic, conductive and/or dissipative.”
Static development Last autumn, at the Fakuma trade fair in Germany, Avient announced its latest offerings in the static management and shielding areas. Its Stat-Tech TPE static dissipative and electrically conductive thermoplastic elastomers (TPEs) offer electrical resistivity from 10 to 1010
Ω.
“The new Stat-Tech TPEs have been developed to help enhance system performance, whether protecting sensitive electronics from interference, shielding electronics in ADAS, or avoiding static build-up in industrial applications such as conveyor
38 COMPOUNDING WORLD | January/February 2024
www.compoundingworld.com
IMAGE: EUROTEC
IMAGE: POLYPLASTICS
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