MATERIALS | ADDITIVES


and therefore usually have poorer mechanical characteristics. There is often contamination with non-compatible foreign polymers, which must be handled. Therefore, the aim is to improve the properties of regenerates and compounds based on recycled plastics and adjust their quality in such a way that higher-quality end products can be manufactured. Our montan wax-based Cevo formulations combine the mechanisms of disper- sion, stabilisation, compatibilisation and chemical intervention in the chemical structure of the polymer, depending on the application.” Cevo-process A-3110 is a one pack especially developed for thermally pre-stressed polyamide. In PA recycling, the repeated thermal stress on the polymer leads to chain degradation, which is reflected in a reduction in viscosity. This is accom- panied by a loss of mechanical properties, particu- larly toughness. The formulation contains heat stabilisers which – in synergy with other ingredients – also promote a partial re-polymerisation of decomposed polymer chains. Further degradation of the polymer during the extrusion process is suppressed by the reduction of friction peaks, and the flow characteristics are enhanced. The one pack improves the homogeneity of filler distribu- tion and leads to an increased surface quality. For example, it can be used in agglomerated material based on milled PA fibre waste. Applications include automotive engine covers – glass fibre/min- eral filled at a dosage of 0.5-0.8%. Cevo-master D-2050 is a reactive modifier to


Right: Völpker manufactures Cevo products on a recently completed compacting plant


improve the flowability of polycarbonates. The company says that it produces fast-flowing regen- erates and compounds based on PC regrinds of higher viscous extrusion qualities. The use of this additive allows the production of easy-flowing PC re-compounds for injection moulding that have properties similar to those of virgin material, such as Lexan 121R. Further investigations have shown that Cevo- master D-2050 is also well suited for converting high-viscosity PA6 (cast polyamide) into a low- viscosity grade during the compounding process. Cevo-master B-6000 is a masterbatch that


promotes the processability and quality of a wide range of recycled polyolefins. In PCR and PIR materials, the additive reduces the processing problems caused by impurities of foreign polymers due to its compatibilising effect. The flow behav- iour of the compounds/regenerates can also be increased in a targeted manner. In parallel, the use of Cevo-master B-6000 leads to a more stable process and basic stabilisation of the compound. The distribution of further additives, for example dyes, is also supported. Cevo-master B-6000 is also suitable as a toughness improver. In addition, in PET recycling Cevo-process J-3400 and Waradur OPplus can reduce friction peaks during the extrusion process and help improve surface qualities and disperse fillers like talc, particularly when high filler loads apply. Ampacet has introduced ThermProtect, which utilises multi-functional stabiliser technology to address the market need for powerful antioxidant masterbatches designed to be used in PCR-rich formulations. The company says that ThermProtect can improve aesthetics, processability and func- tionality while minimising the adverse effects of contaminants in PCR. ThermProtect joins Ampacet’s R3


Sustainable Solutions products, a range of masterbatches designed to support circular economy initiatives.


Developed to meet the challenges of materials with higher PCR content, ThermProtect stabilises polymers subjected to multiple heat histories and contaminants. Contaminants in PCR, such as inks, slips, fillers, catalyst residue and other contami- nants, degrade both aesthetics and functionality. This degradation manifests itself through viscosity changes, black specks, gels, discolouration, plate out, off-odours and reduction of mechanical properties/embrittlement. While traditional phenolic and phosphite


antioxidants provide thermal stability at moderate temperatures, Ampacet’s technology features high performance antioxidants that provide thermal


30 PLASTICS RECYCLING WORLD | March/April 2023 www.plasticsrecyclingworld.com


IMAGE: VÖLPKER


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