flame retardants | Additives Right:
Paxymer’s FR system propagates
cross-linking in a fire
situation and works syner- gistically with HFFR products
offer added value,” says Jerome De Boysere, Group Business Manager, Flame Retardants for Plastics. Meanwhile, he says, Aflammit PCO grades and their
Right: Reduc- ing smoke
generation is a priority in FR development
suitability of it DynaSil FR synergist platform. Depend- ing on the polymer type and the flame retardant, DynaSil FR products can be used in combinations with bromine, metal hydrate, phosphonate and phosphinate type chemistries. “The use of DynaSil FR allows compounders and formulators greater flexibility in designing flame retardant compounds in resins like PP, PE, EVA, nylons, polyesters, PVC and TPU,” says Marketing Director Viggy Mehta. “DynaSil FR can be used to improve fire properties such as lower smoke, slower flame spread and improved vertical burn tests. It can also be used to lower the amount of flame retardant used in a system helping to boost physical properties and improve the processability of fire retardant compounds.” Mehta says this is made possible “due to the unique activity of the DynaSil FR additive during a fire test allowing it to help form a fast acting char causing a break in the fire tetrahedron [this is the classical fire triangle of oxygen, heat and fuel, with the addition of a fourth component, the chemical chain reaction].” DynaSil FR is available as a 50% concentrate in a variety of resin systems. Cornerstone of Thor’s FR portfolio for thermoplas- tics is the Aflammit PCO range of products (PCO 700, 800, 900 and more recently PCO 820) based on phos- phonates. The company says they are distinguished by high efficiency (very low loadings), particularly when combined with special synergists such as amino ether HALS compounds (Flamestab NOR116 from BASF or Hostavin NOW from Clariant, for example), which allows lower loadings in polyolefins compared to traditional halogen/ATO combinations. “Introduced many years ago to masterbatch produc-
ers, they today increasingly find application in thin-walled articles (films, thermoplastic foams, fibres) where such combinations offer an unmatched range of benefits (improved physical properties, maintenance of transpar- ency, excellent UV stability compared to BFR/ATO) at affordable cost - and where added costs apply, they often
24 COMPOUNDING WORLD | December 2015
www.compoundingworld.com
synergistic combinations have also been successfully developed in thicker parts (injection moulded or extruded articles such as seats and corrugated pipes) to meet specifications other than UL 94 V-0, but at higher thicknesses they also compete against other FRs so their potential use in other applications must be evaluated individually. Thor is also developing a growing family (general purpose and customised grades) of intumescent FRs, the Aflammit PPN range, which De Boysere says is increasingly finding success in many polypropylene and TPE applications to meet UL 94 V-0 (or 5V) require- ments at 0.8 or 1.6 mm.
Engineering developments For use in polycarbonate and PC/ABS resins (transpar- ent and coloured applications including LED compo- nents), MPI Chemie is promoting its new Mileflame HPCTP flame retardant, which it says can yield flame retardancy in compounds up to V-0 while the oxygen index can reach 33%. The addition rate to achieve V-0 in polycarbonate is 8-10% while for a PC/ABS blend it is around 10-12%, the company says. The main structure of Mileflame HPCTP consists of phosphorus and nitrogen. MPI Chemie says the structure is stable, after burning it will produce little to no smoke, and the thermal stability is good. It can endure temperatures exceeding 250˚C for an extended period of time, as well as very low temperatures. “After using HPCTP, the PC is water and oil-proof, and will not be attacked by organic solvents,” the company claims. “The required dosage is relatively low (approximately 50% lower than BDP and RDP). Due to the stable structure and low dosage, the quality of the final product will not change (in fact it could even
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