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MATERIALS | HIGH PERFORMANCE COMPOUNDS


PA66, which is established on the market, reaches its limits here, especially in thermal management for the e-mobility sector,” says compounder Akro-Plastic (another SPE winner with a bio-based Akromid Next PA66 reinforced with 35% glass used in a brake disc cover for a motorcycle). It suggests the use of compounds based on polyketone. “Polyketone compounds inherently have very low moisture absorption, which means that the components show very good dimensional stability in a humid environment,” the company claims. “The excellent hydrolysis resistance to water/glycol is


one of the greatest strengths of Akrotek PK. With exposure based on the VW standard (TL 52682 over 1000h/135°C), only a very slight drop in material strength can be seen compared to PA66GF30 HSRL [Figure 3]. This brings a significant advantage when designing the component geometry. Thin component wall thicknesses with constant pressure conditions in the component can thus be realised without any problems.” Akro-Plastic also points out that Akrotek PK components can be joined using common welding processes and exhibit high weld seam strength, even when these weld seams are under load. In addition, because PK is highly crystalline, it says short cycle times can be achieved in the injection moulding process. Recycled materials are now featuring in all sorts


of plastics, ranging from commodity polyolefins for packaging through to high-end compounds. At the beginning of this year Solvay introduced a new Omnix high-performance polyamide (HPPA) compound family based on a minimum of 33% recycled content. The recycled stream consists of 70% PIR and 30% PCR, which Solvay says is “highly secured and has a controlled process by the supplier.” The principal target market is household appliances.


Solvay describes Omnix as a family of polyam-


Figure 3: Comparison of hydrolysis resistance of 30% glass fibre reinforced grades of PA66 and a polyketone (Akro-Plastic’s Akrotek PK), tested according to VW TL 52682 in glycol solution at 135°C Source: Akro-Plastic


ides that bridge the cost-performance gap be- tween PA66 (or PA6) and polyphthalamide, PPA. “As Solvay’s first-ever recycled-based HPPA with 50% glass fibre reinforcement, Omnix ReCycle is a real breakthrough in the market of polyamides for household appliances,” says Claire Guerrero, Global Marketing Manager for Packaging Segment and Sustainability at Solvay. “It [Omnix ReCycle] combines the outstanding mechanical properties of virgin semi-aromatic HPPA with better flow, lower water pickup and best-in-class surface aspect. In addition, its unique performance and sustainability profile offers an attractive material solution for brand owners and manufacturers who seek to increase the recycled content in their products without compromising dimensional stability, high stiffness, impact resist- ance and processability,” she says. Solvay says that in household appliance applica-


tions, Omnix ReCycle delivers higher durability than provided by standard PA6 or PA66 polymers and, because it yields parts with very good surface appearance, can also eliminate the need for painting.


Spider chart comparison of various properties of Solvay’s Omnix ReCycle HPPA compound against virgin Omnix, PA6, and PA66 grades Source: Solvay


52 COMPOUNDING WORLD | November 2022


Another target end use market for OmnixReCycle is automotive interior parts requiring high wear and tear resistance.


www.compoundingworld.com


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