MATERIALS | ADDITIVES
Above:
Discussions and presentations at the Clariant stand at K2019 highlighted collaboration in plastics circularity
said Sültemeyer. It was Clariant’s intention to continue this after the sale of the masterbatch business to PolyOne, he said. Some of the additive masterbatches produced by Clariant can prevent damage or loss of perfor- mance properties during recycling, and other products repair damage as polymers are pro- cessed, used and then recycled. Its portfolio includes: antioxidants – CESA-nox antioxidants, added during PCR compounding or the produc- tion of new packaging made of recycled material, prevent problems caused by heat and oxygen, such as loss of mechanical properties, discoloration and black spot formation; processing aids – CESA- process additive masterbatches for coping with the variable melt behaviour of PCR polymers; chain extenders – CESA-extend additives for materials such as PET, where moisture, solvents and heat can cause polymer chains to break down, leading to loss of processability, molecular weight and material properties; modifiers – CESA-mod additive masterbatches reduce brittleness and increase impact strength enough to allow bottles and containers made of PCR to better meet top-load and drop-test standards; colour correction – Clari- ant masterbatches include a family of PCR colours for use when the recycled polymer has an undesir- able colour tone (see feature on colours in Plastics
Brüggemann has
developed chain
modifiers for polyamide recycling
Recycling World March-April 2020 issue). Reuse of post-production waste by packaging film manufacturers is the target for AddWorks PKG 906 Circle stabiliser which was launched by Clariant at K2019. Aimed at producers of PP and PE films, AddWorks PKG 906 Circle is particularly well-suited for biaxially-oriented PP manufacturing but is also applicable to cast and blown film processes. The reuse content of post-production waste in the final film can be increased by up to 30%. The company says the additive also protects the resin and film quality with significant reduction of gel formation and prevention of additional yellowing at high line speeds. At K2019, additives producer Brüggemann showed products designed for upcycling polyam- ide waste material into high quality injection moulding grades. The company’s Bruggolen M series of reactive chain modifiers can adjust relative viscosities of recycled polyamides by either lengthening excessively short chains or shortening those which are too long. Brüggemann says: “Producers can use small amounts of these modi- fiers to tailor relative viscosities to their needs in a single compounding step. The resultant upcycled materials exhibit excellent mechanical properties and are suitable for the same applications as prime materials of similar viscosities. This removes the need to blend the recyclate with prime polymers and opens up a wide range of possibilities for establishing a profitable market for secondary polyamide raw materials which meet the high-quali- ty requirements of the moulding industry.” Bruggolen TP-M1417 is formulated to shorten
excessively long molecular chains of high viscosity PA waste materials such as high viscosity extru- dates, films or cast nylon. A low addition rate during extrusion is enough to decrease the viscosity so that the polymer can be injection moulded. “The final viscosity can be very accurately controlled by adjusting the quantity added. Significantly, the mechanical properties of mould- ings from the resultant polymer are similar to those
Source: Brüggemann 26 PLASTICS RECYCLING WORLD | July/August 2020
www.plasticsrecyclingworld.com
IMAGE: CLARIANT
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