POLYAMIDES | ADDITIVES
demanding applications at low temperatures (-40°C), such as those found in the automotive industry. The Orevac IM300 grade, due to its high fluidity, is recommended for injection moulding of small and intricate parts. Both grades are designed for high flow injection moulding applications. Balancing the properties of formulations with impact modifiers can be a challenge. Impact modifiers reduce heat-deflection temperature (HDT) and tensile and flexural properties, but improved HDT is crucial in automotive applications, especially for parts in the engine compartment. Vertellus says its ZeMac copolymer can be added to mitigate the effect of impact modifiers. The company has found that ZeMac can recover most of the lost HDT, tensile and flexural properties, as well as improving hydrolysis resistance. The company says it is continuing to test several properties – including long-term heat aging, low-temperature impact, and abrasion and wear - of formulations produced with ZeMac. These performance characteristics are important for engine-compartment and E&E applications, says Ashok Adur, Global Commercial Development Director for Plastics at Vertellus.
4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4
viscosity range for injection moulding PA66 scrap + 1% TP-M1417 + 2% TP-M1417 + 3% TP-M1417
Figure 1: Adjustment of relative viscocity of PA66 fibre waste using Bruggolen TP-M1417 Source: Brüggemann Chemical
Adding crosslinks Another established way to increase heat resist- ance—as well as mechanical, electrical, and chemical properties—is via crosslinking. It is possible to add and activate a small amount of a crosslinking additive during melt processing, but it can be challenging to control the level of reactivity. An alternative approach is to add a crosslinking additive
INNOVATIVE ADDITIVES
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relative viscosity (ISO307, solvent 96% H2
SO4
)
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