ANTIOXIDANTS AND STABILISERS | ADDITIVES


Sectors as varied as agriculture and automotive are demanding more effective stabilisers that meet performance demands for both virgin and recycled resins.Peter Mapleston reports


Growing demands for stable plastics


Antioxidants and UV stabilisers play a vital role in polymer compounding, allowing the performance of any plastic part to be maintained over its full expected lifetime. The latest antioxidants and stabilisers are designed to help virgin — and increasingly fully or partly recycled — compounds perform better and for longer, especially when used outdoors. These new stabilising systems cover polymers ranging from polyolefins through to engineering thermoplastics. Recent additive introductions from SI Group have been developed to help compounders further improve the performance of their compounds to meet increasingly demanding technical require- ments, the company says. The first is targeted at the transportation industry, which is calling for plastics components with higher performance and sustain- ability. The new Lowinox S2225 stabilisation blend provides enhanced thermal protection, lower VOC emissions, and improved colour stability in both filled and unfilled PP compounds.


www.compoundingworld.com Lowinox S2225 is said to deliver better colour


protection at 50% lower dosage levels than a standard multifunctional antioxidant (AO) bench- mark package containing phenolic, phosphite and thioester antioxidants, the company says (Figure 1). In trials, no visible colour was observed in com- pounds, even after five extrusion passes. As a result, SI Group says it allows higher levels of recycled material to be incorporated into com- pounds without sacrificing colour stability and durability of the new parts. The group is also expanding its Weston antioxi-


dant portfolio with the addition of Weston 705 nonylphenol-free phosphite in a masterbatch form. This is intended for polyolefin compounders, converters, and recyclers that are not currently in a position to use neat Weston 705, which is supplied as a liquid. “Unlike conventional antioxidant masterbatches,


Weston 705 masterbatch will provide no deposits on extrusion equipment (plate-out), thus lowering


September 2022 | COMPOUNDING WORLD 65


Main image: The latest stabilisers


meet the needs of sectors such as agriculture while accom- modating increasing usage of recycled material


IMAGE: UNITECHEM GROUP


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