IMPACT MODIFIERS | ADDITIVES
Lotryl additives show positive effect in ageing tests on recycled ABS material Source: SKFP
mechanical and aesthetic specifica- tions. SK Functional Polymers (SKFP), known for developing Lotader reactive and Lotryl non-reactive additives, has recently focused its efforts on improving the properties of recycled high impact PS and recycled ABS, which is becoming more readily available as regulation is leading to plastics recycling in end-of-life vehicles, and waste electrical and electronic equipment.
“Our customers consistently
request us to support them in adjusting the rABS rheology to their needs,” said Nico Esselin, Market Development Manager at SKFP. “If the rABS is injection moulded, the compound may require additives to increase its melt index. If the com- pound is processed by extrusion, the melt index may need to be reduced. At the same time impact resistance must always be boosted through the use of reactive additives.” More recently, SKFP has demon-
strated its additives can have a positive effect on rABS ageing resistance, which in turn improves impact resistance. In test situations, rABS samples were submitted to 90°C for up to 1,000 hours with 5% additives loading. Before ageing, the best performing solutions were the ethylene-methyl acrylate (EMA) copolymer with the highest MA
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content (Lotryl 40MA05T & 29MA03T). These formulations remain the best performing even after 1,000 hours of ageing. Among the conclu- sions of the study were that EMA resins perform better than styrene- butadiene based modifiers, and Lotryl EMA copolymers do not lower rABS gloss. In addition to solutions for recycled styrenics resins, SKFP has also developed solutions to improve the properties of recycled PA, PET, PBT and their blends. Evonik offers various additive technologies to help meet the needs of the plastics processing industry and enable the upcycling of post- consumer materials. The company promotes a range of additives for recycling applications under the TEGO Sorb & Cycle umbrella, which offer an effective reduction of malodour while mechanical proper- ties can be enhanced using the TEGO Cycle CP grades. The company says it is already working to expand the portfolio, but one of the most striking aspects of the latest test results was an increase in impact resistance when using special organo-modified siloxanes (OMS). With OMS Evonik says it offers a complete toolbox of additives based on a surface-active siloxane backbone. The differentiation to silicone oil is the organic modifica- tion which allows the adjustment of
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