ADDITIVES | SURFACE MODIFICATION
particles in a proprietary PA resin blend. Graphite significantly reduces the coefficient of friction of a material, with some potential to also reduce abrasive wear. Examples of applications for low friction compounds include rotors and bearing components for water flow meters. “The non- migratory nature of graphite combined with its antifriction properties makes this grade an ideal additive for parts used in submerged and potable water applications,” Colloids says. The company also notes that in bearing systems, the use of a correctly formulated graphite modified compound for both stationary and rotating parts reduces the development of static electrical charges during operation. Colloids can also produce graphite and MoS2
concentrates in other
Figure 4: CoF and wear rate of PPA compounds containing different metal sulphides Source: Tribotecc
range of products for engineering polymers, primarily polyamides. Moulded or machined finished components containing the masterbatches can operate at ambient or elevated temperatures without the need for an external lubricant. Pace MPA9D2338 anti-wear masterbatch
incorporates MoS2 in polyamide 6. Addition can be
at the intermediate compounding step – for compounds used to extrude polyamide stock shape rods, plates, tubes and profiles, for example – or by direct addition in a final process such as injection moulding. End use engineering applications include: bearings, sheaves, gears, sprockets, rollers and wear components. Pace MPA9D2339 incorporates fine graphite
polymers if required. The company is currently working on the development of more antifriction and wear- reducing formulations for high performance polymers. Upcoming products are likely to include masterbatches containing graphene, thanks to cooperation with the National Institute of Graphene at the University of Manchester.
Compound benefits Other producers of compounds have also been hard at work coming up with new solutions. Lehmann & Voss and Eurostar Engineering Plastics also highlighted new developments. At the AMI conference. Lehmann & Voss Product Development Manager Dr Markus Topp spoke about the tribology of new compounds based on polyetherketoneketone (PEKK), which appear to have some advantages over PEEK compounds,
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