LUBRICANTS AND PROCESSING AIDS | ADDITIVES
Polymers to give its products more visibility in the Middle East, Africa, and India. The CEVO range of wax-based additives from
Voelpker Spezialprodukte are said to act as viscosity-regulating combination lubricants, dispersion aids and surface improvers in a range of polymer compounds and recycled polymers. For example, CEVO-process A-3105 improves distribu- tion homogeneity — of fillers, pigments and flame retardants, for example — and enhances flow and demolding, according to Lutz Matthies, Head of Business Development at the company. Voelpker manufactures additive formulations
tailored to specific polymers and production challenges, in physical forms desired by plastics manufacturers and compounders, such as dust-free powders and compacted prills. The company is currently building a new plant at its existing site at Völpke in Germany to meet increasing demand for these ready-to-use additive formulations. It is expected to commence operation in the summer of this year. Matthies expects to see increasing demand for
biodegradable additives, saying there is more than one way to meet this need. “Research has demon-
strated that montan ester waxes with suitable emulsifiers are easily biodegradable (test method OECD 301 B; > 80%),” he says. Biobased materials are also sought after. Voelpker’s CEVO-process J-4418 grade, for example, is based on renewable raw materials and is used in engineering thermo- plastics. The additive is chemically equivalent to a montan ester wax so is expected to have similar biodegradability; tests are underway, reports Matthies.
Recycling focus Reprocessed content in compounds containing mechanically recycled plastics can downgrade processability, aesthetics, and mechanical proper- ties of film or moulded articles but adding a processing aid can counteract these issues, according to Robert Lowrie, Field Sales Engineer and Market Manager at Arkema. Processing aids in film can reduce melt pressure (for easier or faster processing), improve flow stability, reduce or eliminate melt fracture, reduce gels, and reduce die build-up. In injection moulding, processing aids can help reduce cycle times, reduce processing temperatures, and enable better moulding of lower
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