ANTIOXIDANTS AND STABILISERS | ADDITIVES
promote electrical corrosion and lead to failure of components such as sensitive sensors, connectors and similar applications. This is not the case with phenol-based additives, but their stabilisation effect decreases rapidly above 120°C, getting completely lost beyond 150°C.” Brüggemann already has a comprehensive
portfolio of heat stabilisers to protect polyamides across the full technically-relevant temperature range. A recent addition to that line is the copper- based TP-H1804, which is suitable for temperatures up to 190°C. Added in small amounts (0.5% to 3%), it does not require a separate activation cycle above 180°C to achieve its high efficiency, which the company says makes it a cost-effective alterna- tive to conventional high-temperature stabilisers. Staying in the electrical sector, Brüggemann and masterbatch specialist Grafe have jointly devel- oped a colour stable eOrange masterbatch for use in e-mobility applications. The eye-catching colour, employed to mark plastic-sheathed high voltage components, retains its signal effect beyond 1,000h at 130°C in PA without darkening. Japan’s Adeka is now offering two novel triazine-type next-generation high performance ultraviolet (UV) absorbers — ADK Stab LA-F70 and
Right: Electric vehicles are placing new demands on stabiliser and masterbatch producers
ADK Stab LA-46. Triazine-type UV absorbers exhibit different maximum absorption wavelengths, ranging from 270 to 360nm, depending on their chemical structure and most also have a high absorbance per unit weight, according to the company. It says ADK Stab LA-F70 exhibits very good absorption in the UV-A region of 320nm to 400nm (Figure 8). By way of comparison, it says conventional UV absorbers typically absorb in the wavelength range from 280nm to 340nm. “Since LA-F70 provides high UV cut-off even at low loading amount in UV-A region, it can be
Film stabilisers ensure bees stay busy
The possible effects of some agro- chemicals on bee populations and the effects that may have on their ability to pollinate plants is of increasing concern globally. During the virtual Agricultural Film conference organ- ised by Compounding World pub- lisher AMI, Sabo presented a study into whether greenhouse film contain- ing benzotriazole UV absorbers — which are more effective at blocking UV-A radiation than triazine — has any effect on bee pollination activity.
The study was carried out by the Developmental and Support Centre for Agricultural Practices (CERSAA) in Italy. Two films were tested: Film A contained a UV-blocking formulation based on Sabo’s SaboStab UV 216, a fully formulated system containing a HALS and a benzotriazole UV absorb- er dosed at an amount sufficient to fully block UV-A radiation; Film B used a triazine UV absorber and HALS. The first trial involved growing three types of tomato pollinated by
bumble bees. Two out of three tomato types were unaffected by the UV screen; one type showed slightly higher productivity under Film B. A second trial looked at the effect on melons pollinated by European honey bees. Again there were no differences in productivity but Film B seemed to accelerate ripening time. “The hypothesis of inhibition of
Italian trials show greenhouse film stabilisers do not harm bee pollination efficiency
www.compoundingworld.com
pollinator activity due to the high UV filtering effect in the greenhouses was rejected in all cases,” says Enrico Galfrè, Technical Support and Application Development Manager at Sabo. More likely reasons for lack of pollinators included the use of other agrochemicals, delay in pollen maturation, and chemical or physical damage to flowers. Sabo produces a range of addi- tives for greenhouse film, including UV protection products. �
www.sabo.com �
www.cersaa.it
September 2021 | COMPOUNDING WORLD 89
IMAGE: SABO
IMAGE: GRAFE
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