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MATERIALS | HIGH PERFORMANCE COMPOUNDS


Right: This automotive crash box demonstrator is produced in a long fibre reinforced LCP from Sumitomo Chemical. The part is shown before (left) and after impact


Sumitomo, which are injection moulded with metal inserts for screw attachment to neighbouring components. The grade is also being used in a brake rotor disc, where it weighs around 50% less than a steel alternative and 30% less than aluminium. Another grade, in this case reinforced with long


wear and friction; and technical recyclates to reduce environmental footprint. “The materials offer a metal alternative in terms of technical performance, component appearance and design freedom, as well as in terms of total cost and carbon footprint,” the company says.


PPS developments Claiming to offer the broadest range of PPS compounds, Sun Chemical showed new develop- ments at last month’s K2022 trade fair pitched at applications in automotive E-power trains, power electronics, lithium-ion cells and batteries for hybrid and battery cars, as well as for pipes for thermal management of both combustion and electrical engines. In particular, it highlighted its newly-developed


PPS Z-200-XP unfilled, impact modified, extrusion grade, which is designed for use in pipe and tube extrusion. “The solution offers high viscosity at the optimum level for the extrusion process, combined with high flexibility and elasticity, which enables a smooth heat-forming process, while maintaining chemical and heat resistance,” the company says. It also presented the PPS Z-240 Black injection moulding grade for bus bar applications for hybrid and electric cars. It is said to offer high flow, good temperature and heat shock resistance, high dielectric strength, and very low dimensional tolerances. Japan’s Sumitomo Chemical is using carbon and


glass fibres to further improve the performance of its liquid crystal thermoplastics (LCPs). A Sumikasuper LCP grade containing 45% carbon fibre, for example, is said to display very high modulus and high heat resistance. It has been used in components for a suspen- sion system on a sports car test bed at


50 COMPOUNDING WORLD | November 2022


glass fibre, shows promise for use in “top hat” type crash boxes for cars and is currently being pro- posed to several automotive OEMs, according to the company. Reinforcement levels of 30-50% are said to provide energy absorption properties on a par with metal versions. Crash boxes based on thermoplastics have been proposed before but Sumitomo says this solution provides a benefit of creating no debris in the event of a crash impact. The winners list of the Society of Plastics Engineers Central Europe’s 2022 Automotive Awards — announced just before K2022— included many parts made in high performance engineering thermoplastic compounds. The overall winner was a centre console including Grivory GVS-5H 50% glass fibre reinforced polyamide (a semicrystalline PA with partially aromatic copolyamide) from EMS-Chemie. The powertrain category was won by an EV flap module moulded in two parts and assembled in the mould; one part is moulded in a 30% glass reinforced PPS from Sun Chemical, and the other in a 30% carbon fibre reinforced PA6T/X from Evonik. Solvay secured three third places: in the New Mobility Category for a connection ring insert moulded in Ryton PPS reinforced with 40% glass fibres; in the Enabler Category with a crash impact resistance module in Amodel PPA reinforced with 45% glass fibre; and in the Electronic Category for an inverter module overmoulded with a Ryton PPS compound containing glass fibres and minerals.


Cooling solutions Plastic components that come into contact with water/glycol mixtures require special compounds, with good chemical resistance and low water absorption high on the list. “Heat resistant 30% glass reinforced


This Inverter module is overmoulded with a Ryton PPS compound from Solvay


www.compoundingworld.com


IMAGE: PETER MAPLESTON


IMAGE: SOLVAY/LG-MAGNA


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