MATERIALS | ADDITIVES


damage by re-stabilisation, but, by repairing the polymer chains, the resultant mechanical strength more closely matches that of virgin polymer. Adeka has developed the ADK Cycloaid UPR


series of additive solutions to boost the perfor- mance of recycled plastics. “In recent years, various governments have announced regulations and set targets to reduce the environmental impact of plastics,” says Marie-Raphaël Morvillier, Technical Director. “These targets and regulations, such as those related to single use plastics in particular, are intended to increase the recycling of plastics. In parallel, brand owners and OEMs have committed to integrate more recycled resins into their prod- ucts.”


She says: “Mechanical recycling has emerged as


Bruggolen TP-R8895 from Brüggemann significantly improves the retention of mechanical properties in polypropylene recyclates after accelerated testing at 150°C heat storage Source: Brüggemann


original impact strength is still present. Brüggemann has introduced three new additives for improved stabilisation of polyolefin recyclates. The company says that these additives result in recyclates with good mechanical and processing properties, making the need for the addition of virgin material unnecessary. All Brug- golen R grades are supplied as dust-free additive blends in compacted granule form for easy and homogeneous distribution. Two of the stabilisers are for polypropylene


recycling. Bruggolen TP-R2090 can be used to recycle PCR and PIR waste, whereas Bruggolen TP-R8895, through its increased acid scavenger content, is especially suitable for recycling PP from battery cases. Both additives result in recyclates of a quality that cannot be achieved via conventional re-stabilisation. For polyethylene recycling, Brüggemann has developed Bruggolen TP-R2162, which also contains new repair technology and is particularly suitable for LLDPE recyclates used in film extrusion. The repair mechanism results in film with increased initial mechanical strength and a significantly reduced number of defects. Laboratory tests, for example, show an increase of around 25% in tensile strength and 10% in elongation at break, even at minimal dosage levels of 0.3%. These properties of the polyolefin recyclates are made possible by a specially developed technol- ogy. For the first time, it is possible to repair defects to the molecular chains that occur during process- ing and subsequent use and which impair quality. The recyclate is not only protected from further


28 PLASTICS RECYCLING WORLD | March/April 2023


a prominent method of recycling plastics, where material from industrial and post-consumer sources are recovered via mechanical processes to provide PIR and PCR recyclates. Utilising PCR is more challenging than PIR because PCR has been contaminated or degraded during its previous life. Consequently, PCR has several challenges such as odour, migration, low mechanical properties, low thermal stability and discolouration, which are less of a problem with PIR.” The company says that the ADK Cycloaid UPR series is designed for mechanically recycled plastics with the prospect of broadening their applications. Two types of additive packages are of- fered to provide different benefits. ADK Cycloaid UPR-001 is an additive package


for improving long term thermal stability (LTTS) of recycled plastics and preventing thermal degrada- tion during processing. Tests show that UPR-001 improves the LTTS of a PP compound containing 70% PCR dramatically, taking it to the same level of performance as a PP compound with 30% PCR without UPR-001. This means that UPR-001 enables the ratio of recycled plastics to be increased while maintaining performance not possible without it. As well as replacing virgin plastics with recycled ones, UPR-001 can also be used for upcycling PCR plastics by improving the LTTS to meet the require- ments of the final application. ADK Cycloaid UPR-011 is an additive package


that provides an improvement of mechanical properties, as well as thermal stability, to recycled plastics. Tests show that UPR-011 can improve properties such as the tensile modulus of several recycled compounds containing different ratios of PCR-PP. UPR-011 shows continuous performance improvement for all recycled compounds with increasing ratios of PCR-PP. Compared with standard additives, this also demonstrates that the


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