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MATERIALS | ADDITIVES


achieved by prime polyamides,” says Brüggemann. Another new chain modifier, Bruggolen M1251, lengthens the molecular chains of PA recyclate which have degraded during processing and use causing a reduction in molecular weight. The mechanical properties of the recyclate can be improved to match those of prime material, according to Brüggemann. Bruggolen M1253 is available as a smaller pellet size of the same additive, which makes for easier dosing during compounding.


Brüggemann has branched out from PA addi- tives in a collaboration with Fraunhofer LBF Institute for Structural Durability and System Reliability to develop new stabilisers for high-quali- ty polyolefin recyclates. The stabilisers are claimed to be capable of reducing the effects of previous damage due to thermal oxidation and photo-oxi- dation that can prevent them from being recycled into high quality moulded products. Fraunhofer LBF says that it has used its knowl-


edge of the effects of polymer additives, such as antioxidants, light stabilisers, flame retardants and nucleating agents, to tackle the special challenges posed by recycled materials. Due to their special reactivity, the new stabiliser systems have the potential to neutralise the effects of previous damage, paving the way for the production of recyclate with processing properties and long-term heat stability that are similar to those of virgin material. The new systems are based partially on renewable raw materials. “With its many years of comprehensive experi- ence in the field of polymer additives and its worldwide market penetration, Brüggemann is the right partner to bring our ideas for the upcycling of plastics to market quickly,” says Rudolf Pfaendner, Head of the Plastics Division at Fraunhofer LBF. Building on the work of Fraunhofer LBF, Brügge- mann will use its know-how and technical potential to optimise formulations. The company will adapt the stabilisers to the requirements of customers and markets, provide technical application advice


and will take over large-scale production, quality assurance and worldwide marketing. Stabiliser producer Songwon is another company that is becoming more active in enabling materials to meet circular economy goals. It says: “Resins are today designed for a single life cycle. If they are not re-stabilised when recycled, they lose so many of their properties that it is difficult, if not impossible, to reprocess them. A ‘top-up’ stabilisa- tion package allows some of the properties of the material to be retained once it has been recycled. With this top-up approach, however, part of the polymer architecture is degraded, and the material can only be used for applications with more modest requirements – hence the term ‘downcycling’.” The properties of the polymer must be better


retained to ensure improved protection against degradation, it says. “One way of achieving this is to increase the amount of stabiliser. However, this approach has its limitations, which include the risk of blooming and a potential increase in yellowing.” Songwon’s response is a “design-for-circularity” approach to polymer stabilisation that maximizes the effectiveness of the resin. “Added at the initial processing stage, the new Songxtend packages provide the resin with better protection without increasing the amount of stabiliser used. The material can subsequently be recycled more than once.” However, topping up may still be necessary as


some recycled materials are used for highly demanding applications and as a result can be heavily contaminated. At K2019, Songwon showed a new thermal stabilisation additive for use with recycled polypropylene in automotive applications. The company says Songxtend 2721 is a high-per- formance stabiliser that improves the long-term heat stability of vehicle interior and under-the- hood parts, extending their service life. Concentra- tion levels can be adjusted to meet the long-term heat stability requirements of applications, such as engine covers, cable ducts and battery housings, for example. As well as increasing durability, Songxtend 2721 helps to minimise the negative effect of acid residues from battery case recycling. Songwon is also “walking the walk” in a


project to use polyethylene recyclate in pack- aging. It has teamed up with packaging company Berry BPI to produce special PE bags from recycled materials originating


Songwon has started to package its products in 20kg PE bags made with 50% recycled PE


28 PLASTICS RECYCLING WORLD | July/August 2020


from different waste streams, such as used industrial printed bags. It says it is one of the first chemical companies to package its products in 20kg PE bags made with 50%


recycled PE. Songwon has also been working with an unnamed plastics producer to


www.plasticsrecyclingworld.com


IMAGE: SONGWON


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