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ADDITIVES | FLAME RETARDANTS


Right: Clariant sees its Exolit OP halogen- free flame retardant


allowing more recyclate usage in E&E & automotive parts


displays,” the company says. Budenheim highlights the use of its halogen-free additives in bio-composites such as wood-reinforced plastics (WPCs). It cites the example of its Budit 620, which is based on coated ammonium polyphos- phate, saying it is suitable for outdoor applications due to its high stability and water resistance. With addition rates of around 20%, depending on the formulation and fibre content, compounds are said to obtain UL94 V-0 ratings at 4mm. Budit 381, also based on APP, is intended for


Below:


Budenheim’s Budit 620 can be used in WPCs for outdoor applications


indoor TPU applications with low moisture contact and V-0 ratings can be obtained when it is com- bined with anti-dripping agents, the company says. Budit 344, also for TPUs, has higher water resis- tance. It can be used as a stand-alone solution at low loadings to serve high mechanically-demand- ing applications, while at higher loadings in synergistic combination with phosphinates it stops dripping in the UL 94 test. Finally, the company highlights Budit 669, an intumescent system based on APP with a special coating that it says shows superior mechanical properties and no migration/ blooming within the polymer. One of Thor’s most recent developments is the Aflammit PCO 9xx family of phosphonate-based high-performance flame retardants. Thor says standards such as DIN 4102 B1, NF P92503/504 M1 and UL 94 V-0 can be passed with dosages as low as 4-8%, depending on the material thickness and standard required. The new additives were primarily designed for use in polyolefins but can also be used in other polymers, Thor says. “In combination with synergis- tic radical generators, for instance NOR-HALS, manufacturers can achieve transparent films or foams or moulded pieces with excellent mechanical properties and low density,” says a spokesperson. Also eyeing applications in films is Techmer PM.


Research & Development Engineer Kaan Serpersu says: “Increasingly, we have been receiving


requests where a clear film is needed in the final applications with FR properties. Typical haloge- nated formulas result in opaque films, especially at FR loadings needed to pass NFPA 701 Test Methods 1 and 2. Many of our customers, espe- cially those with global markets, have been moving towards non-halogenated technology for regula- tory needs. We developed PM117000 specifically for these applications where high clarity and FR properties are needed. PM117000 is good for up to 600°F [315°C] making it good for both film and extrusion coating processes. It passes NFPA 701 Test Method 1 and 2 even at thick gauge polyolefin film and produces high clarity film.”


Expandable graphite Georg H Luh supplies expandable graphite, another mineral-based halogen-free flame-retard- ant additive, which it sources from a Chinese producer. “The production process has long since been standardised, resulting in reproducible products that are subject to regular controls,” the company says. “Expandable graphite has already established as a flame retardant in the automotive and construction sectors and is regarded by industry as a safe and long-term flame-retardant solution for these applications. In more and more applications, the existing flame retardant is replaced by expandable graphite or is used as flame retardant additive,” it claims. The company says that product properties – no- tably pH value and expansion volume – can be individually adjusted. “However, not all properties can be adjusted and combined equally. In particu- lar, the settings for particle size and starting temperature have their limits. In order to expand our product range here as well, our products are constantly being further developed and tested.” The company goes on to say that in the discus-


30 COMPOUNDING WORLD | December 2019 www.compoundingworld.com


IMAGE: BUDIT/ASTRONAUT IMAGES


IMAGE: CLARIANT


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