ADDITIVES | PROCESS AIDS
Above: SEM images show dispersion of a conventional PTFE modifier in PPA (left) compared with a functionalised PTFE from AGC’s Fluon+ product line. The PTFE additives are shown in orange
distribution, enhanced haptic properties, and increased hydrophobicity.” The OMS additives are also said to provide
improved compatibility with the polymer matrix. “The organic groups tethered to the main siloxane chain prevent bloom, ensuring that the benefits the OMS provide remain for the full lifetime of the polymer,” Roland says.
Below: Wacker’s Genioplast PE50S08 process aid has been developed specifically for PE compound production
PTFE performance Functionalised PTFE additives are among the latest additions to AGC’s range of Fluon+ modifiers. The company says that more uniform dispersal in the polymer matrix is achievable compared to conven- tional PTFE micropowders due to their optimised compatibility with common matrix materials such as PPA or POM. As a result, the PTFE particles are distributed evenly throughout the finished compo- nent. They are also available on the surface so that the usual wear-in period is removed. Tests on a PPA modified with Fluon+ PTFE modifier showed a reduction in wear of approximately 70%, compared to a compound with a conventional PTFE additive, and a 30% reduction in friction losses. PTFE micropowders are said to be well suited to
improving lubrication and reducing wear in extreme conditions. They are also used in applica- tions where additives such as graphite and molybdenum sulphide are unsuitable. PTFE additives also offer high levels of cleanliness, which is important for food and pharmaceutical applica- tions and, because PTFE is non- flammable, it is also suitable for applications involving exposure to potential fire hazards. At last year’s K show, Munich- based chemical group Wacker launched an additive masterbatch specifically developed for PE compound- ing, Genioplast PE50S08. The new grade is
48 COMPOUNDING WORLD | April 2023
said to be an effective processing aid as its active ingredient improves filler distribution as well as flow of the polymer melt, which in turn increases extruder throughput and reduces the energy needed for compounding. Where mixtures of different PE grades are compounded, as is the case when processing rPE, Genioplast PE50S08 is said to improve mixing uniformity without major torque or temperature fluctuations. It also improves the surface structure of PE products as it reduces the coefficient of kinematic and dynamic friction, giving it a surface that feels silky and dry. As a result, products using it display higher scratch and abrasion resistance, the company says. Last year’s K show also provided Cargill with its first opportunity to show the former Croda additive products it acquired through last year’s €758m acquisition, which gave it the well-known additive brands of Crodamide, Incroslip, Atmer and Ionphase. The Crodamide range is said to offer processors and end-users more flexibility, greater perfor- mance, and better-quality plastics by lowering friction between contacting polymer surfaces, while the Incroslip products deliver high stability and optimised slip, torque release, mould release and anti-scratch benefits. Both additive families can be used in challenging applications ranging from automotive interiors, caps and closures, food packaging, and films. Meanwhile, Atmer and Ionphase products are generally added to reduce or eliminate static related issues such as static dust attraction or electrostatic discharge (ESD). Several new processing aids for plastic recycling and bio polymer applications have been intro- duced by Addisperse over the past few months. Addisperse NC 203 has been specifically devel- oped for use in rHDPE, where it can improve process stability and foaming properties, reduce cell size and process stability, and enhance tensile
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IMAGE: AGC CHEMICALS EUROPE
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