Plastics Technology

DEC 2018

Plastics Technology - Dedicated to improving Plastics Processing.

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PolyOne: The company says it is offering nylon 6 for industrial and automotive applications, two industries the most open to trying alternatives. The company's PlastiComp business is also offering blends of nylon 6 and nylon 66 in long-fiber formulations. BASF: Szendro notes three options: For parts that require good electrical properties, good heat aging, weldability, impact perfor- mance and damping, he proposes Ultradur nylon 6 as a solution. Possible uses include structural components, powertrain applica- tions, and exterior appearance parts such as door handles and pedals. For electrical and lighting applications such as connectors, housings for electrical control units, and sensors, where better dimen- sional stability is a requirement, Szendro cites Ultradur PBT grades. For parts exposed to demanding loads in hot air, such as charge-air ducts or parts where there is a lot of wear, Szendro notes Ultramid Advance PPA grades, which boast both hydrolysis and chemical resistance plus dimensional stability. Lanxess: Chirino gives some examples of specific replacement applications and newly developed materials to compete with nylon 66. The company supported a customer producing a shifter box in 30% glass-filled nylon 66 by showing that the mechanical properties of the component and the dimensions of the part would be the same if a 35% glass-filled nylon 6 was used with existing tooling. Material availability and cost concerns in the household-appliances market led Lanxess to evaluate alternative materials with a customer producing oven handles in a 30% glass-filled nylon 66. In this case, after understanding the part load and impact requirements, Lanxess suggested a nylon 6 with 30% fiberglass and glass beads. The part passed all dimen- sional, load and impact requirements, and also had the advantage of improved appearance. Feedback from nylon 66 customers concerned about long-term fatigue if they switch to an alternative encouraged Lanxess to develop the new Durethan- Performance "P" nylon 6 compounds. These boast improved fatigue properties and perform considerably better than standard nylon 66 grades. A key criterion for selecting a material in the E/E market, particularly for small parts such as connectors, is cycle time. Chirino says Lanxess has seen increased interest in its Pocan XF (eXtreme Flow) PBT and PBT blends. These reportedly have shrinkage and mechanical properties very similar to nylon 66; but because of their low viscosity, these PBTs can be molded at lower temperatures, reducing cooling time in injection molding. For flame-retardant applications, Lanxess has positioned its new Pocan BFN2502 unfilled, halogen-free PBT, which achieves a UL 94V-0 rating at an impressive 0.4 mm, to replace halogen-free unfilled nylon 66. Solvay: Wilson cites Omnix HPPA, a high-performance PPA, as a clear choice to replace glass-filled nylon 66, as it provides equiv- alent properties under dry conditions and superior performance after moisture absorption is considered. It is targeted to structural applications in automotive and food-contact and drinking-water applications in consumer markets. For higher-temperature applications, Wilson suggests Amodel PPA as a good alternative that will outperform nylon 66. For applica- tions requiring high-surface quality and mechanical strength, he cites Ixef PARA polyarylamide (MXD6 nylon) as an alternative. For applications requiring additional flexibility or better impact resistance, there are toughened and elastomer-reinforced grades in the Amodel PPA and Ryton PPS portfolios that offer potential alter- natives to unfilled nylon 66 grades. DSM Engineering Plastics: The company has positioned four polymers that could relatively easily replace nylon 66. Akulon nylon 6, with its near-equivalent performance in stiffness and strength to nylon 66—and superior performance in toughness, processability, and heat-aging up to 392 F—suits it to applications where parts are exposed to hot air such as intake manifolds and air ducts; exposed to oil such as oil pans and filters; and parts with high requirements for surface appearance, such as pedals, door handles and power-tool housings. EcoPaXX nylon 410, a high-performance biobased nylon, is cited for applications where parts are exposed to water or glycol such as in automotive thermal management. It demonstrates low moisture absorption and excellent chemical resistance, fast and easy processing, and the highest melting point of all biobased nylons at up to 482 F. Another alternative is DSM's Stanyl nylon 46 with high stiffness retention up to 554 F and excellent wear and abrasion resistance. It's positioned for parts exposed to wear and friction, or exposed to demanding loads in hot air or oil. Arnite PBT, meantime, is said to be suitable for electrical and lighting applications such as connectors, lighting frame bezels, and LED components. For flame-retardant applications, Lanxess has positioned its new Pocan BFN2502 unfilled, halogen- free PBT to replace halogen- free, unfilled nylon 66. @plastechmag 37 Plastics Technology Nylon 66

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