ADDITIVES | RECYCLING
by chemical reactions post-processing, says Paul Albee, Consultant for Addisperse (part of AFI Global). During injection moulding or extrusion processing, both the malodourous volatiles and the odour eliminators volatilise from the pelletised compound, and it is at this point that the odour eliminators neutralise the malodours. Albee explains that the amount of concentrate
Right: These tote boxes are produced from recycled PP using DeltaMax modifiers from Milliken
required can depend on the intensity of the odour. “If 1% of ON 106 or ON 108 is not effective, we recommend a modified odour eliminator concen- trate based on direct evaluation of the compound in question. This evaluation uses a non-vented, single-screw extruder to measure an odour rating. The com- pound is pelletised and collected in glass jars. The jars sit for 24 hours, then samples are evaluated by our odour panel for odour intensity, odour translation, and character,” he says. Struktol has a number of
offerings in the area of odour reduction. Struktol RP 53 is described as a blend of odour- neutralising chemistries useful for problematic odours such as those from mercaptans (sulphur), amines, and phosphites in recycled polyolefins as well as other resins. Struktol RP 59 combines odour-neutralising chemistries and volatile organic compound (VOC) absorbers and is intended for difficult, high odour, and high volatile content compounds. The company says the additive is effective in plastic packaging to reduce odours from the packaging as well as for absorbing
odours from the packaged product. Struktol RP 17 is a combination of a lubricant and an odour-neu- tralising mask that was originally designed to reduce odours in wood-plastic composites. The additive has since been modified for use in a wide range of recycled compounds that can need the combination of lubrication, mould release, and odour management.
Coming together Recyclate often contains a mix of polymers and fillers and a lack of compatibility between them can cause poor mixing, rough surfaces, and poor properties.
Additives such as coupling agents and compatibilisers can work at the molecular interfaces of dissimilar surfaces to improve proper- ties and processing (and were detailed in the May 2019
edition of Compounding World.) Viscosity-modifying and lubricating additives
and processing aids also can also be effective in improving processing of recyclate streams. Combination products from Struktol, for example, include a Struktol RP 38, which is designed for recycled PP with a high level of PE, and TR 219, intended for polyester compounds contaminated with other resins (detailed in the September 2018 edition of Compounding World.) Milliken, meanwhile, says its DeltaMax modi- fiers for PP enhance impact and melt flow proper- ties of recycled PP resins and blends. Recycled
High-performance thermoplastic HFFR and cross-linkable polyolefin compounds of our TABOCAB brand
Effective tailor-made solutions for special applications in the cable industry
Cooperation with our partners in development, service, technical support and customer care
Safer Cables, Safer Living SILON Compounds Make Better Cables
www.silon-cablecompounds.eu
PHOTO: MILLIKEN
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