MATERIALS | ENGINEERING THERMOPLASTICS
Right: Avient has new toughened PPA-based compounds for IC engine compartments and other demanding applications
cals and fluids are absolutely essential in support- ing demanding applications for vehicle electrifica- tion,” says Giacomo Parisi, Global Marketing Director For Automotive Electrification. Latest developments geared to EVs include a new hybrid bobbin produced from Zytel HTN that supports thermal management in e-motors; a plastic/metal hybrid cooling plate where a channel plate made from Zytel HTN is chemically bonded to aluminium to create a solution that improves durability and thermal management performance of battery cells; Zytel and Zytel HTN “electrically friendly” (EF), heat-stabilised resins that can handle contact with aggressive fluids and low- to high- voltage loads in various temperature and humidity conditions; and Crastin HR hydrolysis stabilised PBT for sophisticated sensor systems and other electronic components. Rudy Van Engen, Commercial Director EMEA for Automotive Solutions, says that with the addition of the new EF grades, DuPont is enabling manufactur- ers of EV batteries to overcome concerns about the durability of thermoplastic parts in a very harsh environment. The Zytel 500 series is a new family of PA 66-based solutions within the company’s HTN (High Temperature Nylon) product range. These new materials were developed to largely retain properties in e-mobility oils, to have a high CTI (Comparative Tracking Index) for electrical parts, and EF characteristics. DuPont has developed four ranges of Zytel HTN EF solutions, each based on different polymers, and differentiated in terms of mechanical perfor- mance and such characteristics as heat aging resist- ance and chemical resistance. Each also offers enhanced durability to protect parts from failure due to moisture, elevated temperature, or traces of halide ions.
BASF says that with its new heat-stabilised 30%
glass fibre reinforced Ultramid B3PG6 BK23238, introduced earlier this year, it is expanding its product portfolio of polyamides for the high-tem- perature range. The stabilisation system offers heat resistance of up to 190°C and also prevents galvanic corrosion on electrical components due to its halogenide- and metal-free chemistry (haloge- nide content is under 50ppm). The compound is also said to impress with excellent thermal aging performance, as well as vibration and hot gas welding properties. According to Andreas Stockheim, Segment
Marketing Manager Powertrain and Chassis in BASF’s Performance Materials division, the material “can not only be used in conventional environ- ments [meaning for internal combustion engine compartments], but is also suitable for electronic applications, such as in electric vehicles.” In late October, Avient introduced Edgetek
Toughened polyphthalamide (PPA) formulations. The heat-stabilised, impact-modified materials are formulated in filled and unfilled grades. They maintain tensile strength and tensile elongation properties when tested for long-term thermal aging up to 120°C. With enhanced chemical resistance, they are targeted at such applications as cooling systems, housings, fuel pumps, and structural components. EMS Grivory, meanwhile, has relaunched a
Comparison of creep modulus of three different 50% glass-reinforced polyamides Source: EMS Grivory
20 INJECTION WORLD | November/December 2021
grade in its portfolio of partially aromatic polyam- ides, Grivory G5V, which it says shows a significant- ly improved performance at higher temperatures. It was developed for metal replacement applications, such as automobile instrument panel supports, air vents and seat shells, as well as functional compo- nents in non-auto applications. Improved creep resistance allows lower wall thicknesses to be used. Grivory G5V first came out at K 2016, but Nikolai
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IMAGE: AVIENT/GETTY IMAGES
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