ADDITIVES | ANTIOXIDANTS AND STABILISERS
stabiliser for recycled materials. “RecycloByk 4373 helps to stabilise plastic recyclates by providing protection against the negative effects of contami- nation, such as paint or ink residues, during process- ing and against heat aging,” says Kristen Malm, Senior Marketing Operations Coordinator, Industrial Applications, Plastics, Gas & Oilfield at Byk USA. The RecycloByk additive was specially devel- oped to restabilise PP and other polyolefin compounds exposed to aggressive substances. One application example is the recycling of used battery housings. “Without additives, the acceler- ated heat aging life is almost 700 hours, too short for several years of use as a new battery case. The use of 0.2% or 0.5% RecycloByk 4371 extends this time to more than 1,000 and almost 1,300 hours, representing an increase in service life of more than 80%,” she says.
Figure 5: Comparison of part weight, waste, and top load capability of reground HDPE production scrap with no additional stabilisiation, with a standard phosphite/phenol product, and with Baerlocher’s RST series Baeropol T-Blend 111TX stabiliser Source: Baerlocher
Byk says customers wanting to improve product performance, regulatory and political pressures all require changes in their raw materials and formula- tions. It says electric vehicles are a particular example, longer durability in heat stabilisation requirements but also new system chemistries. “Byk products continue to provide best-in-class perfor- mance for the ever increasing heat requirements of internal combustion vehicles that will be with us for some time. New products in both categories are in the final stages of development and will be intro- duced in the next 6-12 months,” the company says.
Sporting chances Sports stadium seats have been seeing a lot more of the sun in recent months, with the Covid-19 pandem- ic severely restricting the numbers of people sitting on them. What effect that may have had on perfor- mance of the seats, typically made in PP, is not clear. “Without the proper UV light stabilisation
Figure 6: Surface of an extruded profile produced using a recycled HDPE compound containing a Baerlocher chain extender (upper image) compared against a reference with no additive (lower image)
applications,” says Eriksson. “In a customer evalua- tion it was shown how a modification with this chain extender can rid flow instabilities in recycled HDPE, which cause a rough surface appearance on extruded profiles. The modification also removed the rotational memory effect that was present for the reference profile — the tendency of the profile to rotate in the direction of the extruder screw as it exits the die.” See Figure 6. Additives specialist Byk highlights its Byk-Max LS 4125 for light stabilisation and its RycycloByk heat
86 COMPOUNDING WORLD | September 2021
package, your stadium seat would suffer from discoloration and embrittlement, eventually starting to crack after only a few months of outdoor exposure,” says Solvay Global Marketing Director Andrea Landuzzi. “Cyasorb Cynergy Solutions B877 Stabiliser will protect the structure and appearance of your seat, even after several years of outdoor exposure.” Landuzzi says that, aside from UV light stabilisers, stadium seat formulations also contain pigments and flame retardants, depending on the geographi- cal location of the project, and that the components of the formulation must be carefully selected to ensure there are no negative interactions. Depending on the sport, there may be other elements in a stadium that require stabilisation. Field Hockey, for example, was an early adopter of
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IMAGE: BAERLOCHER
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