ADDITIVES | THERMALLY CONDUCTIVE
Right:
Automotive LED lighting is expected to be a major market for TC plastics in the future
Silatherm 1466 and probably with Silatherm VP X, we can now fill the gap, technically and in price, between Silatherm 1360 and Silatherm Advance,” he says. “Applications would be mainly thermoplas- tics compounds for LEDs, e-mobility, electronics, medical devices.” Heat management of automotive LED lighting systems is proving to be a major technical chal- lenge, he says. “A 10°C temperature increase leads to a reduction in the lifetime of electrical compo- nents of around 50%.”
BN developments Germany-headquartered Grolman Group handles European distribution of TC additives for a number of companies. Bastian Müller, Technical Sales Manager, Additives & Resins, highlights the latest developments in Momentive Performance Materials’ broad range of boron nitride powders. “Boron nitride is an established way to boost the thermal conductivity from around 0.2 W/m.K up to 10 W/m.K,” he says. Momentive’s CoolFlow highly crystalline, high purity powders have a mean particle size of around 12-16 microns, depending on the grade, which makes them highly suitable for thin film applica- tions. CoolFlow 500 and 600 are a mix of platelets and agglomerates. The mixture can improve flow compared to platelets in extrusion processing, Müller says. “CF600’s agglomerates can also improve through-plane thermal conductivity over platelet grades, assuming agglomerates are maintained during processing. The softness of the products with a Mohs hardness of only 1.6 ensure that extrusion lines and metal tooling are not damaged during processing.” Momentive´s CoolFX grades represent a new
generation of fillers with higher bulk density, which may lead to easier handling and feeding, Müller says. “Powder flow properties can be improved and the use of a coupling agent improves wetting to
enhance the bond between polymer and BN. This results in better mechanical performance and thermal conductivity.” The coupling agent increases the tensile strength and modulus as well as impact strength of highly filled thermally conductive compounds. CoolFX filled compounds will achieve the same thermal conductivity as standard BN (Figure 4). Typical new applications are said to include housings for boxes used for glass fibre cable signal distribution to TV, telephone and internet, where the small size of the devices requires good heat management.
Graphene opportunity Grolman also acts as European distributor for high performance graphene products produced by Angstron Materials, part of Global Graphene Group (G3). Although the US company maintains a low profile, it is one of the world’s largest produc- ers of graphene nanomaterials. One of its co- founders, Dr Bor Jang, filed the world’s first patent applications on nano graphene and G3 has in-house production capacity of over 300 tonnes/ yr. According to executive vice president Edward Chan, significant additional capacity is operated by licensees that meet G3 quality standards. Chan says this production capacity facilitates the
use of graphene in high-volume applications; he cites heat dissipation in various types of electronic devices and LED lighting. He says prices are lower than carbon nanotubes, for example (which he notes have very different morphologies and produce different combinations of thermal, electrical and mechanical properties in com- pounds), but precise numbers are not publicly available.
Chan emphasises that graphene is not a single
Figure 4: Thermal conductivity of CoolFX 1020, 1021 and 1022 Source: Grolman/Momentive
24 COMPOUNDING WORLD | April 2018
entity, but is produced with variations of physical and chemical properties according to customer requirements. G3 can modify its functionality in
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MAGNETI MARELLI
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