FLAME RETARDANTS | INNOVATION


Figure 5: Table and graph demonstrating how MCA PPM Triazine improves thermal stability (TGA) and fire retardancy of 35% glass reinforced PA66 (Durethan


AKV35CXH2.0 from Lanxess)


Source, MCA Technologies


Figure 6: Notched Izod impact property retention of HIPS and HIPS compounds containing Saytex Alero polymeric FR after multiple recycling passes Source: Albemarle


Backing bromine Suppliers of bromine-based flame retardants (BFRs), which are still used in vast quantities in plastics and other materials, are holding their ground. Matt Von Holle, Vice President Global Business Leader Fire Safety Solutions at Albemarle Corporation, strongly defends bromine-based chemistry. Albemarle’s diverse product offerings include large, brominated molecules in its Saytex branded portfolio, including 8010 ethylene-bis(pentabromophenyl), or EBP, and BT-93W ethylene-bis(tetrabromophthalimide), or EBTBP, both of which Von Holle says have excellent toxicology profiles. “These molecules are non-bioaccumulative due to insolubility in water and organic media, includ- ing fatty oils,” he claims. “Compounds of these molecules have also been tested in mechanical recycling studies, showing excellent retention of flammability, physical, mechanical, rheological, and thermal properties, oftentimes better than the base resin itself.” Von Holle goes on to say that a study in flame


Figure 7: Thermal property retention study — HDT and Vicat — for Saytex Alero in HIPS after multiple recycling passes Source: Albemarle


30 COMPOUNDING WORLD | December 2020


retarded high impact polystyrene (FR-HIPS) containing EBP mimicking post-industrial recycling (PIR) operations at the high end of processing temperatures (250°C) at 10% regrind level, found no observable change in EBP concentration via liquid chromatographic (LC) analysis after six moulding cycles. “Further, independent laboratory studies have confirmed no presence of dioxin or dibenzofuran in the EBP flame retardant raw material, nor in any thermoplastic formulation before or after mechanical recycling,” he says. Albemarle is continuing to develop what Von Holle calls new sustainable and high-performing brominated flame retardants. At flame retardant conferences organised by Compounding World publisher AMI in 2019, the company introduced a


www.compoundingworld.com


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