ADDITIVES | ANTIOXIDANTS AND STABILISERS
Italy. Irganox 1520L is a highly effective thermo- oxidative stabilizer used for a wide range of solution and emulsion polymerised polymers and TPEs. BASF says the product is unique in its ability to provide both processing and long-term heat- aging stability when used alone, at low levels and without co-stabilisers. Where necessary, it can also be used with other additives, such as secondary antioxidants, benzofuranones, light and other functional stabilisers. Tianjin, China-headquartered Rianlon, is a major solution provider of anti-ageing additives and application technologies for polymer materials. Its product portfolio includes antioxidants (Rianox), light stabilisers (Riasorb), and U-packs, which are customised blending formulations. Through the integration last year of Hengshui Kaiya Chemical, Rianlon has now increased production of HALS and their key intermediates. The company says the project improves long term availability and security of supply.
Beside HALS, in addition to being a major supplier
of benzotriazole UV absorber, Rianlon has focused on process development in triazine UV absorber derivatives. One example is RiasorbUV-1164, a triazine type light stabiliser, which is said to have an exceptionally strong and broad-range of UV absorption properties throughout the UV spectrum. The company says it has good solubility, low
colour, low volatility, and high inherent thermal and light stability. It is effective in stabilising PE or PP film, tape, sheet, and other resin systems such as PA, PET, ASA, PETG, PMMA, PBT and PC.
Controlling colour The Songxtend 1105 stabiliser from Songwon is designed to meet requirements for HDPE blow moulding resins produced using chromium-based catalysts. It says numerous processors are now using these types of resins, which are optimised for applications requiring high stiffness and stress-crack resistance, but it says some resin producers have experienced colour problems. Songxtend 1105 is a blend based on a phenolic antioxidant and a high-performance phosphite, which the company says addresses the need for colour improvement (Figure 4). It is said to display improved hydrolytic stability compared with some other high-perfor- mance phosphites used alone or in blends. Meanwhile, SI Group has launched two new
formulated solutions for thermoplastic and silane cross-linkable polyolefin-based cable insulation compounds for low voltage applications. Lowinox PE 807 blend has been developed for Sioplas and Monosil applications; Lowinox PE 808 specifically for technically complex HFFR power cable applica- tions meeting relevant standards at 90 °C under both dry and wet conditions.
Meeting the PPE demands of Covid-19
The huge global rise in demand for Personal Protective Equip- ment (PPE) as a consequence of the Covid-19 pandemic has highlighted the need to run production equipment as efficiently as possible. Spun- bond polyolefin fibres, which are widely used in production of PPE, need to remain stable during processing and maintain the micro-fibre structure that delivers fine pore size in nonwoven sheets. Antioxidants ensure fibre consistency with reduced filament breakage and enable smaller pores between fibres for better high-performance filtration required for essential medical applications, says Andrea Landuzzi, Global Marketing Director, Polymer Additives at Solvay. “Solvay’s portfolio of antioxidants
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Left: The surge in demand for PPE during the Covid-19 pandemic has placed a priority on produc- tion efficiency, says Solvay
Cyanox 1790 and Cyanox 2777 products. “These antioxidants help maintain fibre dimension throughout the fibre-making process so that manufacturers can adhere to strict specifica- tions in end-use products like masks, air filtration and gowns,” he says. “They also demonstrate low colour
for sterile medical applications is formulated to improve the stability of polymeric materials and promote consistent melt viscosity in polymers to meet the evolving needs of PPE manufacturers,” he says.
Landuzzi highlights the company’ COMPOUNDING WORLD | September 2020
development due to high gas fade resistance.” The latter is important as unsightly yellow discoloration during shipping and storage can negatively affect the perception of the quality of product, he explains. �
www.solvay.com
www.compoundingworld.com
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IMAGE: SHUTTERSTOCK
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