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REACTIVE COMPOUNDING | TECHNOLOGY


lem. On the one hand, it is possible to use carbox- ylic acids in the compounding process. Carboxylic acids serve as a catalyst catcher so that the molecu- lar weight degradation will be contained. On the other hand, one can use molecular weight increas- ing additives. Again, these additives serve as bifunctional linear chain extenders or as multifunc- tional polymeric backbones like a styrene maleic anhydride copolymer,” she says. Pagel adds that this is considerably cheaper and more sustainable than crosslinking through electron irradiation or special polyamide variants including glass fibres. The IKT has been able to increase shear viscosity in polyamides through reactive extrusion with both molecular weight-increasing additives and catalyst catchers. Additionally, it has been able to produce semi-finished products and to subsequently form them to components.


Solutions for waste PP The growing – some might say almost vital – need to find new solutions for recycling post-consumer plastics is creating extra force for development of chemical recycling technologies. Not all of them will involve use of compounding extruders as reactors, but it is quite possible that a number will. The MMAtwo project mentioned earlier is one example but another area of post-consumer recycling that involves reactive compounding is in upgrading polypropylene waste. For this applica- tion, Addisperse, a producer of speciality additive masterbatches, has recently begun offering a peroxide masterbatch, eNCORE NC 220 C, which contains a proprietary nano-additive that aids in vis-breaking polypropylene. Technical Director Paul


Diagram showing peroxide injection point placement in a co-kneader extruder


Albee says the nano-additive improves dispersion of the masterbatch in the polypropylene, improv- ing the uniformity of the action of the peroxide. The principal target application for the new masterbatch is in recycling post-consumer waste derived from sheet, film, and non-wovens and turning it into a compound with a higher melt flow index suitable for injection moulding. Albee says there has been increasing activity, certainly in the US, in this area since China closed its doors to imports of post-consumer plastics waste. Albee says the development of the new master-


batch dates back four years or so when the com- pany, responding to requests from potential custom- ers, began studying the benefits of nanotechnology to aid the dispersion of additives based on calcium


GEAR PUMPS, FILTRATION, PELLETIZING AND PULVERIZING SYSTEMS


MAAG – 4 STEPS AHEAD FOR YOUR SUCCESS


www.maag.com


PHOTO: POLYCOMPOUND


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