POLYAMIDES | ADDITIVES
Right: Kitchen appliances such as coffee machines require PA compounds providing
performance at elevated temperatures
Lightweight demands “Lightweighting requires more intricate part design with ever thinner thin-walled components, in- creased glass fibre reinforcement to strengthen these components and advanced polymer addi- tives to allow resultant compounds to be efficiently moulded and to perform as finished components,” says Bergmann. “In addition, higher heat loads due to increasing under-the-hood temperatures require tailored heat stability of the multitude of polyamide components placed there. The broad spread of temperatures found there has highlighted the need for a more differentiated and sophisticated range of heat stabilisers.” Bergmann adds that in some food packaging and appliances, such as coffee machines or kitchen utensils, there is also a need to satisfy both high mechanical performance at elevated tem- peratures and food contact requirements. This can be met through use of appropriately modified PA compounds.
In the automotive sector, E-mobility means more electrical and electronic functional parts, which places new demands on polymeric materials. “Especially in sensitive E&E applications, there is a trend towards additive packages that are free of metal and halides,” says Bergmann. “These are additives that do not trigger electrochemical corrosion while at the same time combine good stabilisation of mechanical properties at elevated temperatures and excellent electric properties.”
Sustainable targets Bergmann says sustainability is also high on most end-user agenda. “Sustainability as a central target for the future drives OEMs to increasingly focus on recycling and to include sustainability as an
important part of their identity. Legislation and European directives will provide further incentives. Recycling of polyamide components is integral to automotive sustainability and is aided by the use of performance additives,” he says. Brüggemann has developed a number of additives to ease production of lightweight and thin wall parts in highly filled PA compounds. These include its Bruggolen TP-P1507 flow enhancer for standard polyamides and Bruggolen TP-P1810 flow enhancer for high temperature polyamides. In addition, nucleating agents such as Bruggolen P22 and TP-P1401 are offered to help optimise dimen- sional stability. For application-specific heat resistance – which
equates to extended mechanical performance at different temperature levels and ranges – the company’s Bruggolen TP-H1607 and Bruggolen TP-H1803 heat stabilisers allow for tailor-made cost-performance solutions. Bruggolen TP-H1805 has been developed for high temperature environ- ments of 200°C and beyond, for example in turbocharged engine environments. Bruggolen TP-H2018 is a new heat stabiliser
masterbatch for PA films and components contacting food, which helps to meet high mechanical perfor- mance demands. And for sensitive E&E applications, Brüggemann is launching Bruggolen TP-H2062, a metal and halogen free stabiliser system for e-mobili- ty and other E&E applications (Figure 1). In the area of polyamide recycling, Brügge-
Figure 1: Tensile strength retention of unreinforced PA66 at 150°C comparing compounds with different stabilisation technologies, including Brüggemann’s Bruggolen TP-H2062 Source: Brüggemann
54 COMPOUNDING WORLD | February 2021
mann’s offering includes Bruggolen TP-M1417 and Bruggolen M1251/1253, both reactive chain modifiers that are said to allow for precise and reproducible adjustment of the relative viscosities of PA waste to the level of high-quality injection moulding grades. Other recycling-focused prod- ucts include long-term heat stabilisers, processing stabilisers, flow enhancers, nucleating agents and other auxiliaries. The company says upcycling frequently requires a targeted selection and
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