ADDITIVES | POLYAMIDES Nylostab S-EED is finding use in improving


processing. Meddah says a 0.3% addition of S-EED reduced cooling time and so lowered cycle time without requiring a nucleating agent in a 40% glass and mineral filled PA66 for production of an injection moulded automotive door handle. It has also been shown to improve dimensional stability by creating better flow stability and minimising shrinkage, Meddah says. The additive can either be added during compounding or used in a masterbatch directly at the injection molding machine. It is part of Clari- ant’s EcoTain-labelled line of products, which have been demonstrated to contribute to meeting sustainability targets. Meddah says in the case of Nylostab S-EED, the improved processing and long-term properties can add value and increase sustainability by saving energy, increasing yield, and offering a longer service lifetime.


Figure 2: Bruggolen TP-H1804 has been developed to stabilise aliphatic polyamides at continuous service temperatures up to 190°C Source: Budenheim


Keeping neutral Last year, Brüggemann introduced a new class of metal and halogen-free heat stabilisers for reinforced and unreinforced PA compounds used in electrical and electronic applications. Bruggolen TP-H2062 and TP-H2217 are considered to be “electrically neutral”—meaning they have no impact on electrical properties and do not corrode metallic components found in parts such as overmoulded sensors. The additives are designed for continuous service temperatures of 170°C with peaks up to 200°C. These temperatures are needed to meet increasingly stringent automotive industry require- ments and they are said to be an improvement over conventional systems such as phenol and copper- based stabilisers. TP-H2217 is designed specifically for halogen-free flame retardant PA formulations that can achieve a UL 94 V-0 classification and demonstrate long-lasting heat resistance at 180°C. The additives are available as masterbatches. Also new to the range is BruggolenTP-H1804, which is developed for aliphatic polyamides used at continuous service temperatures of 160°C to 190°C. It is said to complement the existing TP-H1805 grade, which is intended for use with reinforced polyamides at temperatures above 200°C. According to the company, the TP-H1804 grade significantly outperforms currently available copper salt-based stabilisers in terms of maintaining mechanical properties. For example, it says the tensile strength of a glass fibre reinforced PA66 with the addition of 5% of the new stabiliser is more than 50% of the initial value after 5,000 hours of heat aging at 190 °C; the un-stabilised material barely reaches this limit at 1,000 hours (Figure 2). At 170°C, the company says a 2.4% addition is sufficient to exceed the 5,000-hour mark. Com- pounders also benefit from the new grade’s granular format, which ensures precise dosing. Brüggemann’s flow enhancers for PA improve


processability, particularly for compounds with high fibre contents used in injection moulded parts with long flow paths or low wall thicknesses. The company has previously developed flow enhancers for partially aromatic and aliphatic PA compounds and PBT. This newest addition to the range is designated BruggolenTP-P2201 and is designed for flame-retardant PA, such as those used in e-mobility applications.


Figure 3: Chart showing the effect of CAI’s ST-HT10 polymeric additive on hydrolysis resistance of PA over two months at 70°C Source: CAI Additives


16 COMPOUNDING WORLD | April 2023


Hydrolysis resistant The latest introduction for PA from US-based CAI Additives is an anti-hydrolysis additive that improves hydrolysis resistance in moist, high-tem- perature (120-140°C) use conditions to extend the


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