ADDITIVES | ANTIOXIDANTS AND STABILISERS
Figure 2: Graph showing the reduction in tensile strength of recycled PP blends with and without stabilisation after exposure to UV Source: Solvay
Figure 3: Graph showing the effect of various stabilisers on weatherability as measured by colour change Source: Adeka
Automotive demands The performance envelope for automotive thermo- plastics is being pushed harder than ever. Byk says current market trends are driving its new product development focus toward more rigorous solutions for PAs used in engine-compartment applica- tions. “The need for higher temperature perfor- mance, improved property retention, barrier and chemical/moisture resistance are clear drivers,” says Dan Berg, Global End Use Manager – Trans- portation, in Byk USA’s Thermoplastics Additives and Solutions BU. “The key for the new automotive under-hood requirements is combining thermal stability with chemical stability in simple additive solutions to enable the new design concepts.” Byk-Max HS 4307 is an optimised inorganic stabiliser package for PAs that can help achieve property stability for 300+ hours at 150°C. Im- provements in the pipeline should achieve stability at 190°C and 210°C. Byk-Max 4309 is a copper-free organic stabiliser for PA intended for newer
46 COMPOUNDING WORLD | September 2020
applications that can achieve 100% retention of tensile strength for 300 hours at 150°C. Byk is also offering stabilisation packages to enable use of PP in more challenging applications under the hood. Byk-Max 4342, for example, is a blend of high-heat stabilisers and other “essential components” that can be added during processing of direct inline-compounded glass fibre reinforced PP to achieve long-term resistance (over 1,000 hours) to 150°C. Adeka is another company putting a strong focus on automotive applications in the develop- ment of stabilisers. It says that, using the knowl- edge and experience that it has acquired over many years of stabilisation of polyolefins, it has now developed a market-ready hindered amine light stabiliser (HALS) system for thermoplastic elastomers (TPE). Compared with conventional light stabilisation systems based on HALS-1 (HMW N-CH type) and HALS-2 (N-O Alkyl type), the new stabiliser, ADK Stab LA-704, is said to provide superior weather- ability (Figure 3). Adeka offers ADK Stab LA-704S in masterbatch form on a silica carrier for improved handling and dosing. The masterbatch, ADK Stab LA-704Si, also displays good anti-fogging behaviour. “Further- more, this system provides excellent stabilisation and anti-NOx gas discoloration compared with traditional N-H HALS systems,” says the company. It adds this makes it suitable for automotive interior parts based on TPEs, including TPE-V, TPE-O and TPE-S. Light stabilisation performance in pigment- ed formulations is said to be “outstanding.”
Film challenges Fibres and tapes used in applications such as geo-textiles, roofing insulation, barrier structures as well as synthetic flooring have to withstand harsh climate conditions, including prolonged exposure to UV light, fluctuating and elevated temperature and environmental pollutants, according to BASF. It says HALS systems can provide a solution but standard types may sometimes negatively affect processing. Its latest generation of HALS for the film, fibres and tapes industry is Tinuvin XT 55. Its primary application is polyethylene monofilaments and tapes. “Tinuvin XT 55 has very low contribution to water carry over and therefore enables the produc- tion line to run without disturbance,” BASF says. Typical applications include artificial grass yarns. BASF announced in January its plans to increase
production capacity by 20% for its antioxidant Irganox 1520L at its site in Pontecchio Marconi,
www.compoundingworld.com
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