ADDITIVES | FLAME RETARDANTS
Right:
Bioenvision says it is
developing a new anti-drip additive using its flexible POSS synergist technology
increase of LOI, says Hagemann. They are espe- cially relevant for cable applications for transporta- tion and building applications where legislation such as the European Construction Products Directive (CPD) and EN 45545 is getting more important, according to Evonik. A recent introduction from Budenheim is Budit
669S, a flame-retardant additive based on ammo- nium polyphosphate (APP) that is halogen-free and features a novel coating designed specifically for polyolefin applications, particularly tubes and housings for white goods. Compounds incorporat- ing the flame retardant demonstrate improved mechanical properties and attain a V-0 rating at a thickness of 1.6mm, says Julia Eichhon, Marketing Manager for the company’s Material Science Division.
Another new addition to the portfolio is a flame
retardant additive that boosts CTI (Comparative Tracking Index) in high voltage components without compromising on flame retardancy performance. It is formulated for the e-mobility market, where it can protect against electrical faults, short circuits and meets rigorous safety standards, Eichhorn says. The new grade allows for miniaturisation of the
Below: Avient is expanding its reSound Bio and reSound Rec product lines with halogen-free FR versions for applications such as USB-C cables
final part, allowing manufacturers to achieve their desired level of fire safety without sacrificing space or efficiency. This promotes innovation in product design and manufacturing, opening doors to more compact and streamlined solutions, says Dr Tobias Moss, Budenheim’s Manager of Innovation and Application Development.
Budenheim is also developing dust-free
flame-retardant solutions. “Traditionally, flame retardants were incorporated into materials in the form of powders. However, the presence of dust from these additives poses several challenges, including potential health hazards and environ- mental concerns,” Moss says.
POSS synergists Recent R&D developments at Bioenvision include work to include less than 1% loadings of its polyhedral oligomeric silsesquioxane (POSS) FR synergists in compounds to improve char quality (silicon ceramification), accelerate char formation, and increase ignition time. The company says the organic group on POSS enables tailoring of the FR for specific polymers, either as reactive or additive. In addition to use in polyurethane foams, PP and PVC, recent trials have also shown effectiveness in adhesives and additional testing is in progress to investigate its efficiency in epoxy resins, the company says.
Joint development projects are said to be taking place within several segments where non-toxic and more sustainable flame retardants are needed. During 2023, Bioenvision joined forces with a Norwegian industrial company to build up produc- tion capacity for its non-toxic D-Pyre flame-retard- ant and ensure delivery at large scale. Bioenvision has also been developing a new anti-drip type of additive based on POSS technol- ogy. The company believes there is a need for such a product to replace materials such as PTFE, for instance, which could in the future be subject to restrictions in the EU. Swedish company Paxymer has continued its development of synergists for use with phosphorus and nitrogen based HFFR flame retardants and is now in the final stages of approving the technology in EV applications. Managing Director Amut Paul says the company is developing a toolbox testing kit for assessment, quantification and comparison of FR technologies. The testing toolkit includes sophisticated
quantitative analytical methods that can show the efficiency of HFFR additives with high precision. Relying on a comprehensive methodology that
20 COMPOUNDING WORLD | December 2023
www.compoundingworld.com
IMAGE: AVIENT/GETTY IMAGES
IMAGE: BIOENVISION
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