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technology | PA Additives Effective with both virgin and recycled resin, ZeMac


additives transform PA into a shear-thinning material with high melt strength at a lower cost than conventional SSP-produced high RV nylon, Adur says (Figures 6 and 7). “Shear thinning also enables lower-cost processing by converters compared to conventional high-RV PA,” he adds. “ZeMac masterbatches also enhance flexural modulus, tensile strength, impact strength and elonga- tion.” Target applications include automotive under-the- hood parts and pipes for oil and gas. ZeMac Extend P62 compatibilises PA and recycled


Figure 7: Graph showing how complex viscosity of PA with and without Nexamite varies with shear (measured by frequency sweep parallel-plate rheometry). At high angular frequency (ω), the viscosity is similar for the two melts, but at lower values (indicative of lower shear rates) the Nexamite-modified material displays a substantially higher viscosity, which means a superior melt strength without impact on processibility Source: Nexam Chemical


high-RV PA (high-RV PA has higher mechanical and thermal performance than both linear low-RV PAs and linear PAs that have been solid-stated to increase molecular weight). ZeMac Extend L65 is intended for injection moulding


compounds while ZeMac Extend L68 is for film and profile extrusion and blow moulding grades. The masterbatches can also be used for upgrading recycled or prime nylon compounds, the company says. The third new masterbatch, ZeMac Extend P62, is,


Right: Dow Corning says its silicone- based additives for polyamides provide lower COF and


improved wear resistance at


lower loadings than PTFE


30


according to Vertellus, the only product on the market that can smoothly compatibilise PA and recycled polyethylene terephthalate (PET) to reduce material costs. It can be used to compound polyamides with 15 to 35% recycled PET. The three new pelletized masterbatches comple- ment ZeMac E60-P powder, which is also used as a chain extender and recycling agent. All three include internal and external lubricants. Ashok Adur, Global Commercial Development


Director for Plastics at Vertellus, says that until now compounders whose processing systems did not accommodate powder additives were unable to take advantage of the benefits of ZeMac technologies. “With these new masterbatches our customers can expand the range of compounding equipment on which ZeMac copolymers can be used to give them new options for cutting costs without sacrificing performance,” he says.


COMPOUNDING WORLD | February 2017 www.compoundingworld.com


PET by creating interfacial adhesion between the two otherwise incompatible polymers. It also improves the flexural modulus of the compound to mirror that of 100% virgin PA and raises electrical performance above that of neat PA, Adur says. Compatibilised PET/PA compounds using ZeMac masterbatches can be employed in applications such as office furniture, sporting goods, hand tools and small appliances. ZeMac E60-P powder can be used in all of the same


scenarios as the new masterbatches, except for application in compounds intended for thin parts and smooth profiles and films. “Here ZeMac Extend L68 masterbatch ensures even distribution of the additive, which is critical for smooth, uniform surfaces with no gel deposition,” Adur says. “Particularly in thin parts, the new masterbatch pellets overcome the challenge of fast reactivity between the ZeMac copolymer and nylon 6/6 by accelerating dispersion in the matrix. The E60-P powder grade is the lowest cost option, but where compounders do not achieve adequate uniform feeding and incorporation, the new masterbatch pellet grades can overcome these challenges.” Taking a similar line to Vertellus, Swedish speciality


company Nexam Chemical (which grew out of Perstorp several years ago) says that using its Nexamite technol- ogy, polyamides can be modified in three different ways – chain extension, chain branching and crosslinking. “Depending on the need, one of the three or combina- tions of them can be chosen in order to provide a


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