ADDITIVES | PROCESS AIDS/LUBRICANTS


agents as well as a balanced mixture of stabilisers. Another compounder producing glass fibre


Above: Emery’s Loxiol external lubricants for PVC processing are bio-based


erate-based polyamide for the production of polyamide compounds that was unable to improve and stabilise product quality. “The quality of such polyamide compounds is normally more volatile than that of virgin polymer- based compounds. The reasons for this are primarily the degradation induced in polyamides initiated by thermal preloads and processing-relat- ed inhomogeneities of the recycled material,” he explains. “The use of Cevo-process A-3110 enabled the production of compounds with low variation in mechanical characteristics and consist- ent processing properties.” The A-3110 additive is described as a special one-pack including a synergistic combination of different lubricating


reinforced and impact modified polyamide com- pounds was able to improve its product’s mould filling by 45% (spiral flow test) using 0.5% of Cevo-process A-3100 instead of zinc stearate. The additive is said to have further improved the surface quality of the injection moulded parts produced. A-3100 includes a synergistic combination of different lubricating, release and dispersing agents. In a third case, a microtalc-filled PA6 compound showed ineffective processing behaviour in injection moulding. The customer replaced the wax additive it had been using with 0.5% Cevo-process J-4418 (which is based on renewable plant waxes). “The flow behaviour was improved by 15% and both ejection force and the cycle time were reduced by more than 40%,” says Matthies. Cevo-process J-4418 contains modified natural long-chain fatty acids (mainly C19 – C32). Polish company Euroceras has been making synthetic waxes for more than 45 years. It has reactors for production of polyolefin waxes as well as polar copolymer waxes and what it describes as “unique polyester waxes”. The main plastics application areas for the Ceralene-branded waxes are for dispersion in colour and additive master- batches, external and internal lubrication in PVC processing, as well as flow improvement in techni-


Greener option for recycled compounds


Canada’s GreenMantra Tech- nologies says it has successfully scaled its thermo-catalytic depolymerisation recycling technology to create specialty polymers and synthetic waxes from waste polymers such as PE, PP and PS. The company recently


released application data showing how compounders and converters can use these materials as processing aids to increase recycled content in compounds. It says a key contributor to the low use of post- consumer recyclate (PCR) is the difficulty processors have incorporat- ing higher levels (>25%) into end products. It says this is primarily due to the variability of properties in recycled plastic streams.


46


Typical effect of GreenMantra A115 on properties of a PE compound containing 25% post-consumer recyclate. MFI is increased while elongation is maintained and tensile strength improved


Source: GreenMantra Technologies


GreenMantra Global Market Development Director Christy Sapp says its new data demonstrates how additives such as its A115 product allow manufacturers to overcome some of these processing, compatibil- ity, and quality challenges.


COMPOUNDING WORLD | April 2020


“Compounders and convert- ers typically use GreenMantra’s [processing aid] at a level of 1% to 4% — this in and of itself counts as recycled plastic,” says Sapp. “On top of that, the material gives companies a


‘multiplier effect’, allowing them to incorporate additional recycled content (or lower quality streams with higher MFI) at levels of up to 50% without losing output or impacting final performance properties.” � www.greenmantra.com


www.compoundingworld.com


IMAGE: EMERY OLEOCHEMICALS


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