POLYAMIDES | ADDITIVES
more application areas, we will also work closely with our customers and partners to optimise our Silath- erm portfolio to achieve the requirements for e-mobility applications, in particular.”
Above: Meeting performance demands of ever sophisticated driving aid technology will require combinations of specialty additives and function- al fillers, according to HPF
as will lightweighting and good mechanical properties, and expects combinations of all these properties to be sought after. “We have made a quite extensive investigation in terms of different high-performance fillers for high temperature polyamide grades, such as PA6/10, PA6T/6 and PA 9T, with the goal of modifying the properties,” says Sebö. He says one of the company’s key technologies in this area is the surface treatment of the minerals. A number of different temperature resistant surface treatments capable of meeting the higher processing and working temperatures for high temperature PA grades are currently under development, he says. “We are also currently working on functional fillers for EMV/EMI (electromagnetic vulnerability/electro- magnetic interference) applications and on the topic of combining CTI insulating characteristics with flame retardant and/or thermal conductivity properties,” Sebö says. “As thermally conductive polymers find
Enabling recycling Sweden’s Nexam Chemical also reports a positive development in polyamide markets and says it is receiving an increasing number of requests for additives to improve properties and processing. “We also 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 of recycled material.” Bernquist says rebuilding molecular weight in
the extruder using its Nexamite masterbatch is of particular interest during recycling because it does not add 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,” he says. Nexam Chemical has undertaken a number of tests to demonstrate the effectiveness of Nexamite, including an analysis of linear chain-extension in a long-chain PA intended for extrusion and monofila- ment processing. The improvement in melt strength due to chain extension is shown in Figure 3 while the impact on mechanical properties is demonstrated in Figure 4.
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Figure 3: Analysis showing improvement of long chain PA melt strength due to linear chain extension using Nexam Chemical’s Nexamite additive
60 COMPOUNDING WORLD | February 2021
Source: Nexam Chemical
Figure 4: Mechanical property improvement of a long chain PA due to linear chain extension using Nexam Chemical’s Nexamite additive
Source: Nexam Chemical
www.compoundingworld.com
IMAGE: SHUTTERSTOCK
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