FLAME RETARDANTS | INNOVATION
Figure 8: Change in Izod impact strength of different flame retardant ABS and ABS/PC formulations after recycling Source: ICL
new polymeric FR — Saytex Alero — showing its thermal stability and suitability for recycling. It is said to exhibit improved performance characteris- tics in HIPS and ABS, including heat resistance and impact resistance, which were shown in an injection moulding study to be retained after multiple passes (Figures 6 and 7).
Recycling issues At ICL, a major supplier of brominated and non- brominated flame retardants, Technical Marketing Support Manager Marc Leifer, together with colleagues Eyal Eden and Lein Tange, has also been looking at recyclability of FR compounds and how suitable different types are for electronic displays. ICL reviewed typical compounds widely used in the manufacture of electronic displays. It put the compounds through five cycles of injection mould- ing and mechanical recycling. The first cycle involved virgin compound, while cycles two to five were performed by mixing 50% of the initial compound with 50% of recycled material from the previous cycle. Tests were performed at each stage on flammability, mechanical and rheological properties. Three UL94 V-0 formulations were tested: two
were based on ABS, containing respectively ICL’s F-2400 polymeric high molecular weight epoxy brominated fire retardant (BFR) and ATO; and a blend of F-2400 with its F-2016 epoxy BFR and ATO. The third compound was based on PC/ABS (70/30), using ICL’s Fyrolflex RDP as the flame retardant. UL94 V-0 values were maintained throughout along all five cycles for the ABS/BFR formulations. The PC/ABS formulation maintained UL94 V-0 for the first cycle only and failed at cycles 3 and 5. Both ABS/BFR formulations exhibited an Izod Impact reduction of 15% through the fifth cycle (Figure 8). A 34% reduction was recorded for the PC/ABS/RDP formulation. ABS formulations showed a 23% increase in MFI (220°C/10kg). MFI for the PC/ABS
32 COMPOUNDING WORLD | December 2020
formulation increased by over 200% (250°C/5 kg). As far as resistance to heat and humidity were concerned, injection moulded specimens were aged under the following conditions: oven tempera- ture 80°C; relative humidity 95%; ageing period of 168 hours. The ABS/BFR formulations maintained UL-94 V0, while the PC/ABS/RDP ended up with a rating of V1. The ABS formulations showed a decrease of 13-17% in Izod impact strength, while in the PC/ABS formulation it fell by 32%. ICL also assessed the greenhouse gas emissions equivalents) of several flame-retarded TV
(CO2
housing formulations throughout the lifecycle of the products. The results showed that HIPS and ABS containing brominated FRs exhibit a lower carbon footprint (12.9 and 16.5kg respectively per housing) than a PC/ABS containing BDP (21.7kg).
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.pinfa.eu �
www.bsef.com �
www.adeka.co.jp/en �
www.frxpolymers.com �
www.arichem.com �
www.momentive.com �
www.techmerpm.com �
www.huber.com �
www.nabaltec.de �
http://en.magminerals.ru/ (EcoPiren) �
www.quarzwerke.com �
www.byk.com �
www.budenheim.com �
www.clariant.com �
www.luh.de �
www.neograf.com �
www.lbf.fraunhofer.de �
www.paxymer.se �
www.mcatechnologies.com �
www.albemarle.com �
www.icl-ip.com
www.compoundingworld.com
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