COMPATIBILISERS | MATERIALS
there have been fewer customer rejects and more positive feedback.” Struktol Company produces various additives for plastics recycling, including compatibilisers. Struktol TR 052 is a compatibiliser and blending aid that the company says is highly beneficial, even at low addition rates, for incorporation of regrind/ recycled product in a wide range of polymers. The company said: “Processors can realise
improved physical properties and overall improved processability of compounds requiring some level of recycled content. TR 052 has been shown to significantly improve the processability and performance of mixed recycled streams used when separation of the resins is not done prior. The additive compatibilises dissimilar polymer systems allowing for expanded use of these mixed recycled streams.” Struktol has also made additions to its line of additives for recycled polypropylene. Struktol RP 23 is a multi-functional additive that delivers viscosity reduction at low loading levels along with lubricant and mould release functionality. The lubricant base provides improved processing characteristics in compounding and extrusion, as well as increased mould flow and release for moulders. The company says RP 38 is designed to provide
“unmatched” viscosity modification and lubrication in recycled PP compounds and resins that contain moderate to high levels of polyethylene contami- nation. When used at loading levels as low as 0.2%, the additive leads to increased melt flow and benefits mould filling and release. Using RP 38 allowings wider application of regrind or recycled feed streams without sacrificing certain properties or performance, according to Struktol. For engineering plastics, Struktol offers multiple
products that combine a compatibiliser with lubricants to create a combination product that aids in the incorporation of fillers (mineral or glass) with improved mixing and flow properties as well
Above: Two samples of recycled waste streams containing PET contaminated with other plastics. The one on the left has no compatibiliser. The one on the right, produced under the same process conditions, contains Struktol TR 219
as mould release. These products result in better processing, improved surface quality, and in some cases, better physical properties. Among these products, Struktol TR 229 is for use in both polycarbonate and PC/ABS blends as well as nylon 6 and 66 compounds. It can be used in FDA-approved applications and is also ideal for use in recycled applications. TR 229 has also been found to be effective in polyester (PET and PBT) com- pounds, especially in recycled or recyclate-contain- ing applications or in cases where the polyester compound is contaminated with other plastics. Last year, speciality chemicals company Vertellus added to its range of Zemac ethylene-maleic anhydride copolymers. ZeMac Extend P and Zemac Link NP were both introduced at NPE 2018 in Orlando, US. ZeMac Extend P is a chain extender intended to help upgrade recycled PET and possibly other polyesters, by increasing molecular weight and intrinsic viscosity. “Delivering improved melt viscosity and increasing melt strength, ZeMac Extend P reduces sagging of the extrudate, resulting in faster production,” Vertellus says. It also counteracts hydrolytic degradation and improves impact strength. Vertellus says ZeMac Extend P can be used in a
breadth of target applications, delivering perfor- mance close to that achieved using 100% virgin materials. Examples include staple and filament fibres; injection moulding; film, sheet, tape and profile extrusion; bottle blow moulding; and strapping and foamed sheets. Zemac Link NP compatibilising additive incorpo-
rates new technology developed by Vertellus, which it says “allows compounders and moulders
www.plasticsrecyclingworld.com March/April 2019 | PLASTICS RECYCLING WORLD 51
Left: See Hau Global makes plastic pallets containing recyclate with the aid of ExxonMobil Vistamaxx
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