ANTIOXIDANTS/STABILISERS | ADDITIVES
systems such as phenol- and copper-based stabilisers. The Brugolen TP-H2217 grade is said to be particularly suitable for heat-stabilising halogen- free flame retardant polyamides. Another new stabiliser from the company is Brugolen TP-H1804, developed for aliphatic polyamides used at continuous service tempera- tures of 160-190°C. The company says the additive outperforms copper salt-based stabilisers in terms of mechanical property retention of the materials to which it is added. It complements Brugolen TP-H1805, which was introduced in 2019 and stabilises reinforced aliphatic polyamides for continuous service at 200°C for PA6 and at 230°C for PA66.
Masterbatch manufacturer Ampacet has
blends that it says have been found to be particu- larly useful in polyolefin recycling applications. The additives are available in a dust-free pastille form, which is good for recyclers that often struggle to handle powders. Brand owners are increasingly using recycled HDPE for packaging of goods such as detergents and personal care products and that has resulted in competition for material of suitable quality. Con- verters of such have identified a variety of process- ing challenges, according to the company, some of which can be overcome using a Baeropol T-Blend. Benefits include the ability to use a lower quality feedstock, which results in material cost savings, as well as allowing faster processing cycles. Baerlocher says that the Baeropol T-Blends are also playing a role in film reprocessing, where they can be fed directly into the cutter-compactor unit using low-cost volumetric feeders. The company says the improved quality of the recycled material is evident in, for example, blown film production where gelling and bubble breaking is reduced and more homogenous mechanical performance is achieved.
PA solutions Brugolen TP-H2062 and TP-H2217 are the latest metal and halogen-free heat stabilisers for rein- forced and unreinforced polyamides for electrical and electronic applications from Brüggemann. The company says the additives do not corrode metallic components in parts such as overmoulded sensors and have no impact on the polymer’s electrical properties. Available as easy to handle masterbatches, the company says they enable continuous service temperatures of 170°C with peaks of up to 200°C, so meeting stringent automotive industry require- ments and exceeding the limits of conventional
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introduced PET UVA, an FDA-approved master- batch that provides UVA protection for clear PET packaging. The company says the new product is suitable for blow moulding, film and sheet extru- sion processes, offering good clarity and UVA protection with transmission of less than 10% at 13 mils up to 390 nm with a 1% LDR. It is claimed to be able to significantly reduce the cost of UVA protection for PET packaging by providing benefits with LDRs of 0.4-0.8%, depending on performance requirements.
Making predictions Researchers at Fraunhofer LBF (Institute for Structural Durability and System Reliability) say they have developed an online rheological investigation method for accelerating development of antioxi- dant formulations. Plastics degrade by auto-oxida- tion when in contact with air, a process initiated by elevated temperature or light that propagates as a radical chain reaction, causing cleavage of the
Left:
Ampacet’s PET UVA is an FDA-approved masterbatch that provides UVA protection for clear PET packaging
Left:
Baerlocher’s Baeropol T-Blends can improve the quality of PIR and PCR
content used in PE film
September 2023 | COMPOUNDING WORLD 59
IMAGE: BAERLOCHER
IMAGE: AMPACET
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