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materials | Thermally conductive compounds


Figure 7: Main performance characteristics of three thermally conductive Schulatec PA6 grades Schulatec PA6 HC7150


Description


Tensile modulus Tensile strength Density


Strain at break Charpy impact


Thermal conductivity CTI


Source: A Schulman


effectively dissipates the heat generated by LEDs and helps ensure long service life. At K2016, the company showed prototype lamps incorporating heat sinks made of Makrolon TC8030, a highly filled PC compound with a very high thermal conductivity of 20 W/m.K. The heat sink design, which with its high surface


area/volume ratio echoes that of a snowflake, origi- nated in a collaborative project completed between Covestro, Karelia University of Applied Sciences (UAS) and the Finnish injection moulding company Vesuto Oy. Covestro says a performance comparison of the heat sink made from Makrolon TC8030 with similar compo- nents made of other polymers shows that the polycar- bonate very effectively dissipates the heat generated by LEDs on built-in printed circuit boards. Independent compounder PolyOne says Akboru


Elektrik, a leading Turkish supplier of lighting systems for pools, hot tubs and gardens, selected its Therma- Tech thermally conductive compounds to replace aluminum in the heat sinks of LED swimming pool lighting. The move enabled Akboru Elektrik to triple the


Conductive Plastics 2017 You can learn more about the latest develop- ments in thermally conductive plastics at the third Conductive Plastics conference, which takes place in Cologne, Germany, on 27-28 June 2017. Organised by Compounding World publisher Applied Market Information, Conductive Plastics 2017 is focused on the formulation, design and production of thermally and electrically conductive plastics compounds and components. Its high level two-day programme includes expert presentations covering the latest and emerging additive technologies, as well as key advice on compounding and processing of these novel materials. For more details about attending, exhibiting or sponsoring, visit the conference website. Or contact Conference Organiser Kat Langner Email: kl@amiplastics.com; Tel: +44 117 314 8111


CONDUCTIVE PL ASTICS 2O17


Developing technologies and applications for electrically and thermally conductive plastics


27-28 June 2017 Maritim Hotel,


Cologne, Germany PLATINUM SPONSORS Organised by: Also sponsored by: Media supporters: SPECIAL OFFER: Save €200 if you register before 31st March 2017 http://www.amiplastics.com/events/event?Code=C792 56 COMPOUNDING WORLD | February 2017


expected useful lifetime of the lights, to halve part weight, and increase output by close to 25%. The elimination of secondary operations previously needed to finish the aluminium parts helped reduce costs per unit by over 20%


Measuring challenge Meanwhile, compounder A Schulman points out that measuring thermal conductivity coefficients is not easy, especially as there are several standards and norms in place. “They [the norms] are hardly comparable and, furthermore, the preparation of the specimen is not part of the standards,” says a company spokesperson. This can lead to deviations by up to a factor of seven in the heat conductivity in the case of two different measurement methods. A study carried out at the IKV plastics process- ing institute in Aachen showed that the comparison of thermally conductive grades based on datasheet values is particularly difficult. So Schulman says it measures the average heat conductivity of the compounds. The company has developed a product range of tailor made heat conductive (HC) compounds to meet the customers’ specific application requirements. The grades in the range all use ceramic fillers, so are electrically insulating. Performance characteristics of three custom- er-made grades based on PA6 are shown in Figure 7. Other grades are under development, says Schulman.


Click on the links for more information: ❙ www.carbodeon.netwww.imerys-graphite-and-carbon.comwww.avanzare.eswww.hpfminerals.comwww.hubermaterials.comwww.lanxess.comwww.dsmep.comwww.covestro.comwww.polyone.comwww.aschulman.com


www.compoundingworld.com Unit


[MPa] [MPa]


[kg/m³] [%]


[kJ/m³] [W/m.K] [V]


High mechanical properties


12500 120 1.8 1.9 30


1.2 600


Schulatec PA6 HC H2 High mechanicals;


organic heat stabiliser 11600 113 1.8 1.8 30


1.2 600


Schulatec PA6 HC 7150 LED High mechanicals;


white colour for LED applications 11300 125 1.9 2.1 40


1.2 600


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