ADDITIVES | RECYCLING
fillers, catalyst residues and other residual additives degrade both aesthetics and functionality, accord- ing to Doreen Becker, Director of Sustainability at Ampacet. “Choosing the correct masterbatch or concentrate is essential to prevent or correct the problems typically encountered when using recycled materials, such as viscosity changes, black specks, gels, discoloration, plate out, off-odours, moisture-retention and reduction of mechanical properties/brittleness,” she says. Becker points to Ampacet’s range of solutions
that include masterbatches to reduce off-odours, correct colour, and reduce moisture retention. These include its new ThermProtect antioxidant master- batches, which are said to be designed for “PCR-rich formulations”. The company says the high-perfor- mance antioxidants in the masterbatches “provide thermal stability at high temperatures and reduce gel formation in recycled PP and PE.” It claims specialty radical scavengers in the masterbatch stop oxidation while acid scavengers prevent degrada- tion caused by inks or other contaminants in PCR. ThermProtect 1001145-N, which is manufactured
in North America for non-FDA (non-food contact) PE and PP applications, contains high performance
phenolic and phosphite antioxidants and alkyl radical and acid scavengers. ThermProtect 1001265-N, which meets FDA requirements, contains high performance phenolic and phosphite antioxidents and acid scavengers. The masterbatch- es are suited for PE and PP blow-moulded products, films, and building and construction products such as composite lumber, crates and buckets. ThermProtect 7000121-E is manufactured in
Europe for rPET applications. It contains high performance phenolic and phosphite antioxidants and is designed to reduce yellowing in recycled PET, primarily for injection stretch blow moulding, injection and extrusion thermoforming processes. In addition, Ampacet’s ThermProtect 7000119-E contains high-performance phenolic and phos- phite antioxidants and a blue toner for additional reduction of yellowing in recycled PET. The masterbatches enable PET bottles, containers, and trays to be recycled.
Incompatible mixes One of the more significant issues when making PCR and PIR more usable results from the materials typically containing incompatible polymers. These
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