RECYCLING | ADDITIVES
Fibre waste provides a source for polymer for
recycling, with PA carpet fibre a good example. However, melt flow can be a challenge so CAI has developed a specialised melt flow improver for use with PA, as well as PE, PC, PET, PBT, PEI, PLA, PBAT. Elsewhere, ST-HT10 can protect PA against hydroly- sis, with tests showing a 72% increase in tensile strength after ageing in high humidity for two months at 70 °C. ST-HT312 is a heat stabiliser said to provide good heat resistance for PA6 and PA66 compounds up to 180 °C. Lightweighting is seen as a key sustainability
Above: Imerys says talc functional fillers and modifiers are not affected by multiple extrusion passes
unwanted odour and VOCs from polyolefins during compounding without the need for additional specialist equipment. Another CAI product — ST-CE37 — acts as a chain
extender for recycled PA, PC, polyester, and other condensation polymers. This additive, which can also be used with some bio-based and biodegrad- able plastics, is said to help rebuild the polymer backbone of recycled plastics and copolymer blends. It is very effective at low loadings due to its highly available epoxy functionality sidechain. The company also offers various high perfor- mance compatibilisers. For PP they offer ST-G-PP- 30LO and for ABS ST-4210, both of which are based on maleic anhydride technology and are claimed to provide good efficiency and minimal unwanted emissions. Both are manufactured without extru- sion, so they bring no unwanted heat history, and the company says they show hydrophobicity, a lack of stickiness, and anhydride reactivity.
trend but reducing the thickness of plastic parts can lead to fragility and warpage. Talcs can be added to plastics to help restore dimensional stability and — as the mineral is chemically inert, thermally stable, and not affected by multi-pass extrusion — it can be recycled many times without losing its initial properties. As a rule, finer talcs provide the greatest effect
on flexural modulus. Imerys offers a full range of talc grades with different fineness of grind, which it says allows compound formulators to obtain the optimum cost/performance ratio for their require- ment. It says the reinforcement attained using 30% coarse talc is equivalent to that obtained with 25% of its fine Steagreen grade, enabling a 4% reduc- tion in compound density. The company says a plastic compound reinforced with fine Steagreen talc demonstrates a 30% improvement in dimen- sional stability.
Specific demands Imerys also offers high aspect ratio (HAR) talcs. These are said to meet the specific demands of the
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IMAGE: SHUTTERSTOCK
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