TECHNOLOGY | THERMALLY CONDUCTIVE COMPOUNDS
Left: Staramide PA6 80E10 compounds, shown in virgin, silver and gold variants, are used in applications ranging from premium packaging through automotive dashboard components to appliance knobs due to their “cool-to-touch” metal-like haptics
systems, he says: “In most cases, assuming the heat sink is well designed and we have a convec- tion-limited situation, thermal conductivity values above 1W/m.K ensure proper cooling and optimum thermal manage- ment.
Right: Effective use of CFD software allows thermal
management to be predicted and optimised, allowing plastics to replace metals in heat sinks, according to SABIC
Eurostar EP offers a broad portfolio of thermally conductive plastics, branded Star T, based on different combinations of various additives such as mineral and metal oxide fillers. It also has a new range of thermally conductive, electrically insula- tive plastics based on polyamide and specific mineral fillers. Star T PA6 65E12 and Star T PA6 75E12 have been formulated to reach optimum through-plane (respectively 0.9 & 1.5 W/m.K) and in- plane (1.4 & 2.3 W/m.K) thermal conductivities. Chopin claims the through-plane conductivity is among best-in-class while mechanical properties are better than can be obtained using boron nitride. The two grades are also said to be more cost effective and offer good processing characteristics. Eurostar also claims lower abrasion than alterna- tives based on ceramics such as aluminium oxide. Starflam PA66C10VZ23 is a flame retardant option rated UL94 V-0. Its average thermal conductivity is around 1 W/m.K.
Conference EUROPE
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Conductive Plastics
Developing technologies and applications for electrically and thermally conductive plastics
Perfect touch On a second track, Eurostar EP has also developed thermally conductive PA compounds with en- hanced haptics based on combinations of metallic powders. Chopin says they offer solutions when- ever high density, freedom of design, and in- creased thermal conductivity is needed. They process well, enabling moulding of complex designs. Some grades have been optimised in order to offer a particularly high mechanical property profile: for instance, Staramide PA6 1565VE10, which has a thermal conductivity of 1.1W/m.K, is claimed to offer a modulus of 12.8GPa and Izod impact strength of 62kJ/m2 “These compounds can offer metal-like cool
.
touch,” says Chopin. “They can improve the feel of plastics parts to match the touch of a surface to its look. Moreover, these compounds are particularly well suited for specific part decoration such as electrostatic painting and electroplating in order to provide the visual aspect of metal.” The LNP Konduit product line from SABIC covers compounds based on semi-crystalline and amorphous resins, with some offering up to fifty times the thermal conductivity of typical unfilled materials. SABIC says that for convection limited applica-
tions, heat transfer models show that the thermal conductivity of
Konduit compounds can be sufficient to
replace metals, creating opportunities for component re-design, consolidation, and miniaturisation. According to the company, SABIC’s Specialties business is developing novel LNP Konduit com- pound formulations that combine thermal conduc- tivity with other desired effects such as EMI shielding. These resins are compounded with thermally conductive fillers with small amounts of
SAVE €200* when you book before
5 September 2020 using code EB1074
Conductive Plastics 2020, Munich, Germany
1-2 December 2020, Munich Marriott Hotel, Munich, Germany Media supporters: *Discount cannot be retrospectively applied or used in conjunction with any other offer Bringing the plastics industry together. @Contact_AMI #AMIConductive
The latest developments in formulation of thermally conductive plastics will be on the agenda at AMI’s fifth Conductive Plastics conference, which takes place in Munich in Germany on 1-2 December 2020. Expert speakers include thermal modification specialists from Albis, Fraunhofer Institute, George H Lüh, Grafe, Huber, Imerys, and Witcom Engineering Plastics. Topics on the agenda include development of additive systems to enhance thermal conductivity and flame retardance (Quarzwerke), development of graphite-filled thermally conductive pipes (ZBT), and finite element modelling of thermal conductivity in plastics (University of Applied Sciences, Karlsruhe). Find out more HERE
32 COMPOUNDING WORLD | August 2020
www.compoundingworld.com
IMAGE: EUROTEC EP
IMAGE: SABIC
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