ADDITIVES | MATERIALS
high-quality injection moulding grades. Brüggemann offers a broad portfolio for recycling including long-term heat stabilisers, processing stabilisers, flow enhancers, nucleating agents and other auxiliaries. Swedish company Nexam Chemical is also observing good development in polyamide markets. “We see an increasing interest in the use of recycled polyamide, as well as other polymers in general,” says Henrik Bernquist, Business Develop- ment Manager. “Generally during the recycling process, polymers lose a part of their performance due to degradation. The degradation decreases the molecular weight, and this has to be restored in order to reuse the polymer in more demanding applications. With our reactive recycling chemistry, we are able to offer products to ensure high quality products despite the use recycled material. Rebuilding molecular weight directly in the extruder with a Nexamite masterbatch is of particular interest during recycling because it does not add extra cost in terms of equipment or extra processing steps. We are also able to tailor our Nexamite range to fit specific customer require- ments with respect to melt modification and chain extension and modification.”
Nexam Chemical has undertaken a number of tests to demonstrate Nexamite’s effectiveness, for example, in linear chain-extension of a long-chain PA for extrusion and monofilament processing. In chain extension during compounding, reactivity was achieved in a mini-compounder and no gels were detected. There were also improvements in melt strength and mechanical properties. In addition, chain extension of a low viscosity PA for extrusion quality grades achieved high MFI long-chain PAs. During compounding the additive led to an elongation at break of more than 200%, greater than 25% improvement in tensile strength, a rise in e-modulus of more than 10% and no gel formation.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.evonik.com �
https://milliken.com �
www.ampacet.com �
www.gabriel-chemie.com �
www.techmerpm.com �
www.baerlocher.com �
www.riverdaleglobal.com �
www.brueggemann.com �
www.nexamchemical.com
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www.plasticsrecyclingworld.com March/April 2021 | PLASTICS RECYCLING WORLD 47
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