ADDITIVES | FLAME RETARDANTS
Figure 6: Impact strength as a function of
sample thickness in 30% glass fibre-reinforced PBT compounds containing different brominated flame retardants
Source: ICL
as the one on EBP photolysis, and others on thermal and hydrolytic stability, compatibility and non-blooming performance, and recyclability, to promote the benefits of brominated FRs to key stakeholders, including regulatory agencies, customers and consumers. The new generation of BFRs have been extensively studied and are safe and sustainable polymer additives.” At ICL, another leader in brominated FRs (as well as an important supplier of phosphorus-based compounds), Sustainability Director Lein Tange says the carbon footprint of its BFRs is roughly half that of competing phosphorus-containing types, since the company obtains its bromine from the Dead Sea in what he says is a clean and energy- efficient process.
Polymeric gains The trend continues towards polymeric flame retardants (and, to a lesser extent, reactive types), Tange says, citing ICL’s polymeric flame retardant FR-122P block copolymer of polystyrene and brominated polybutadiene for expanded polysty- rene thermal insulation, as well as FR-1025 bromi- nated PMMA for various types of engineering thermoplastics and styrenic copolymers, where it provides extra advantages in terms of processabil- ity, thermal stability, and also impact properties. ICL has recently carried out work to explore the
effect of sample thickness on Izod impact strength in 30% glass fibre reinforced PBT compounds containing different brominated FRs. All formula- tions were rated V-0 at 0.8 mm and 0.4 mm. Three different ICL BFRs were used in this work, contain- ing 8% bromine and 5% ATO: FR-1025, FR-803P (a brominated polystyrene), and F-2100 (a brominat-
32 COMPOUNDING WORLD | December 2022
ed epoxy). Results showed that all three BFRs improved compound impact strength. With FR-1025, the effect increased in thinner samples (Figure 6). The same observation was found in the Falling
Dart (Gardner) Impact test with 3.2 mm and 1.6 mm samples, with FR-1025 again producing the best results. “These findings are in-line with reports from ICL customers who claim that especially with thin-walled products there is a significant advan- tage for using FR-1025 over other flame retardants available in the market,” says Eyal Eden, Plastic Lab and Technical Support Manager at ICL.
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www.compoundingworld.com
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