MATERIALS | FILM ADDITIVES
No Flame Retardant
ADK Stab FP-T80 (0.5%) VTM-2
FR-1* (1%) No rating
Above: Images showing UL94 VTM (Vertical Thin Material) fire resistance testing of a 200-micron MFR 2 LLDPE film with no flame retardant, ADK Stab FP-780, and a competitive traditional NO-Alkyl FR
increasingly common requirement in highly technical applications, where the direction of development is towards halogen-free types. Halogen-free flame retardants such as P-N (phosphorus-nitrogen) intumescents and metal hydroxides are found in electric and electrical devices, including wire & cable, where they offer the benefit of low smoke emissions alongside ‘green’ credentials. But they are considered less suitable for films due to the high loadings typically required to obtain the desired fire performance, which makes processability of the compounds a critical issue.
Tackling fire One of the latest halogen-free flame retardants from Adeka that is suitable for use in films is ADK Stab FP-T80, which is based on NO-Alkyl chemistry. This liquid additive is said to have proven high flame retardant performance at loadings as low as 0.5-1.0% while also providing good processability in applications such as polyolefin films and fibres. The additive acts as a radical generator during combustion and prevents fire spread by avoiding dripping as well as contributing to the gas-phase radical reaction. Adeka highlights the example of a 200-micron LLDPE film containing 0.5% of ADK Stab FP-T80, which achieves a VTM-2 flammability rating according to the UL94 VTM (Vertical Thin Material) test method. The company says that in its tests the novel structure of ADK Stab FP-T80 enabled it to offer performance superior to that of an alternative NO-Alkyl type FR product. “Furthermore, results from horizontal test methods such as FMVSS 302 show that ADK Stab FP-T80 substantially suppresses the rate of flame spread,” says the company. It adds that the additive preserves translucence of polyolefins and allows coloration.
20 COMPOUNDING WORLD | January 2022
Source: Adeka
NO-Alkyl compounds also act as light and heat stabilisers. “Therefore, ADK Stab FP-T80 may be considered for exterior applications including tents and sheets for building & construction applications,” Adeka says. According to the company, a test sample of a 200-micron PP film incorporating 1% of ADK Stab FP-T80 exhibited self-extinguishing behaviour and achieved a B2 rating under the German DIN 4102 standard covering fire behaviour of building materials and elements. Another company offering a novel development in flame retardants for films is Inovia Materials, with its ionic liquids (covered in more detail in the December 2021 flame retardants feature in Compounding World). Ionic liquids containing elements such as phosphorus, nitrogen, and sulphur can be used as halogen-free flame retardants. Structures can be tailored to work with different plastic materials so that processability can be improved, while optical and mechanical properties can be maintained. When used in combination with traditional flame
retardants, ionic flame retardants are claimed to improve compatibility between the additives and the plastic, further enhancing flame retardant performance and mitigating negative effects on physical properties. Inovia has registered its products in various key markets and registration in others is said to be ongoing.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.milliken.com �
www.palsgaard.com/polymers �
www.ampacet.com �
www.croda.com �
www.evonik.com �
https://hudsonresourcesinc.com/ �
www.adeka.co.jp/en �
http://inoviamaterials.com/english/
www.compoundingworld.com
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