ADDITIVES | ANTIOXIDANTS/UV STABILISERS When it comes to thermal performance, Landuzzi
says Cyasorb Cynergy Solutions B878T Stabilizer maintains over 70% retention of stress at break (Figure 8) and strain at break after 7,500 hours of thermal aging at 116°C, compared to a commercial formula- tion that loses both properties after 3,000 hours.
Figure 7: 60° retention of gloss of Solvay’s Cyasorb Cynergy M535 against competitive stabiliser systems in green HDPE after 10,000 hours G155 weathering (* indicates surface crazing) Source: Solvay
Figure 8: Retention of stress at break of Solvay’s Cyasorb Cynergy B878T after oven aging at 116°C compared to a competitive formulation Source: Solvay
New antioxidant blends SI Group acquired Albemarle’s Ethanox and Ethaphos additives and Alblend one-packs in 2014. It says it has developed one-pack technology “to provide unique blends of the additive blends comprising of particulate polymer additives such as antioxidants, thermal stabilisers, UV stabilisers, acid neutralisers, clarifiers, nucleators, and process- ing aids without use of conventional binders and without melting any components.” Senior Product Manager Jeffrey Wang says that, because of the niche applications of specialty polyolefin resins and inter-material substitution of plastic resins, he sees a growing trend of selecting combinations of additives and use levels for applications that range from automotive, appli- ances, and construction through to packaging. For bi-axially oriented polypropylene (BOPP), Alblend 925 is claimed to provide “exceptionally better” melt flow and colour stability at higher processing temperatures, compared with rival blends. It has shown improved stabilisation for BOPP film resins in maintaining melt viscosity stability during film conversion/orientation/ stretching and preventing web breakage in a wide processing window. SI Group’s S Series Alblends target the need to
improve stability and enhance long term thermal stability during processing. They have been shown to provide better melt flow and colour stability at half the concentration of generic one-packs such as Alblend 181/182. They also provide improved LTTS (Figure 9). The company has also developed some novel Alblends containing Ethanox 330, a potent hindered phenolic AO suitable for stabilising bimodal HDPE resins used in plastic pipes.
Figure 9: Long term thermal stability of HDPE pipe resins stabilised with SI Group’s Alblend S Series one pack Source: SI Group
50 COMPOUNDING WORLD | September 2017
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.addivant.com �
www.doverchem.com �
www.songwon.com �
www.adeka.co.jp/en/chemical �
www.clariant.com �
www.plastic-additives.basf.com �
www.cytec.com (Solvay) �
www.oka-tec.com �
www.everspringchem.com �
www.siigroup.com
www.compoundingworld.com
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