MATERIALS | ENGINEERING THERMOPLASTICS
Right: A new grade of Ultrason PESU from BASF has excellent tribological properties, and high resistance to hot oils
polymers. It says renewable and bio- based materials are starting to be used in compounds for environmental sustainability. It has produced compounds with bio-based raw materials under the brand BioStar. Grades are developed from PLA and PA bio-based polymers reinforced with glass fibre, some contain- ing halogen-free flame retardant. The renewable content ranges from 20% to 90%. DSM has made a strong commitment to
increasing its use of renewables too (see Injection World November-December 2019). But it is also looking at other ways to improve sustainability. In a recent blog, Amit Tolani, Business Development Manager, talked about the need for improved performance in bearings for new generations of automobiles. Noting that the maximum range on a single charge remains a concern for consumers, he said that there is significant demand for battery packs with larger capacity and improved efficiency. “Because of these market drivers, automakers
are pursuing smaller and lighter automotive components, and developing faster, higher output motors operating at higher efficiencies,” Tolani says. “Accordingly, bearings used in powertrains, especially in electric motors, are being subjected to higher speeds and performance demands. Also, the downsizing of the motor brings demand for higher motor speed, and it is expected to run continuously for hours and in different conditions.
Chart 2: Modified ASTM G105 (sand slurry) abrasion results from RTP
This requires better bearing performances.” A source of friction inside the bearing can be the cage. This
rotates eccentrically around the bearings axis and is in contact with the outer ring at one position. Metal cages cause more friction
compared to polymer cages and demand a high level of consistent lubrication and high surface finish. DSM’s Stanyl PA46 delivers greater durability, extreme wear and abrasion
resistance, ductility, and creep resistance, even at temperatures as high as 220°C. BASF too is looking at applications calling for very good tribological properties at high tempera- tures. It has just launched a new polyethersulfone (PESU), Ultrason E0510 C2TR, for automotive parts in contact with hot oil. The grade, which contains 10% carbon fibre, is said to have excellent dimensional stability over broad ranges of temperature fluctua- tions. It can be used for products operating within a wide temperature range between -30 and +180°C. Target products include oil pumps, oil control
pistons, pressure valves and high-speed compo- nents in automatic or manual gearboxes. The material can also be employed in new applications for alternative drive technologies. Good flow properties mean it can be used for parts with wall thicknesses of less than 1mm. “The low coefficient of thermal expansion of 10.4 [10-6/K] ensures parts that are dimensionally stable and that can with- stand rapid temperature changes without any damage,” says BASF. The company adds that tests according to ASTM G137 have shown that the sliding friction perfor-
Source: RTP Company
38 INJECTION WORLD | November/December 2020
www.injectionworld.com
IMAGE: BASF
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